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Energy Systems - Science topic

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hi
There are not many publications I could find about wind-geothermal hybrid systems. I want to know what the problems are related to this issue. I need an authentic resource that discusses the feasibility of wind-geo hybrid energy systems.
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Narjes Azizi The constraints include a limited supply, limited acceptable geographical locations, transmission losses, and the danger of decreasing subterranean well steam resources.
In the literature, common potential barriers to geothermal district heating system (GDHS) development include a lack of awareness of geothermal energy system benefits among local governments, the complexity and risk associated with GDHS projects, and a lack of local knowledge required to manage these complex issues.
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I am referring to prospective REGIONAL (NUTS2 or NUTS3) approaches, using modelling frameworks (TIMES, LEAP, OSEMOSYS, ENERGYPLAN, MESSAGE, etc.), with simulation/optimisation procedure, scenario analysis, 2030-2050 or more, etc.
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Hello Diego Garcia-Gusano,
we used MESSAGE on city the city scale of Vienna in our group.
Besides I could also recommend the following papers on city scales using modeling frameworks.
Best regards,
Daniel Horak
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Considering the dynamic characteristics of energy systems, such as gas network and district heating network, we often use partial differential equations to discribe them, then solve them by Euler finite difference technique. While in the state estimation, how to deal with the states of the new nodes added by the difference technique?
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Maybe you can google Kalman filter for distributed parameter systems (continuous) or for 2D systems (discrete).
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I'm working on biogas powered trigeneration system that needs to be assisted with solar thermal unit. I'm using Aspen Plus which is more suitable for steady state simulation and the dynamic simulations I have come across are more of petrochemical systems. I am just wondering if the software is suitable for the simulation of solar thermal system. How do I model the time dependent behaviour of the unit? Referenced suggestions will be appreciated. Thanks.
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Hi all, I am also struggling with simulating the parabolic trough collector in aspen . kindly assist me. I want it to act as a preheater at a certain location in Kenya.
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Dear researchers,
Do you have experience on digitisation of urban energy system? If so, please leave some comments on below three questions. Many thanks!
  1. What are the limitations of digitisation of urban energy system in your projects, from aspects of data, coordination, capacity, finance, risks and so on.
  2. What are the feasible business models derived or based on digitisation of urban energy system in your projects?
  3. What are the main barriers for digitisation of urban energy system in your projects, and what are potential solutions?
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Many thanks@Deep for your comments. They're all in line with our knowledge in house. Would appreciate if there's more specific challenge or gap etc.
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Which approach is appropriate when dealing with uncertainties, associated with renewable energy outputs and load, for an optimal sizing problem (for integrated energy systems, such as power grid and gas network)?
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I recommend that you review these manuscripts. This is a list of scientific contributions selected from the Scopus Database. I hope this information will be of great use to you.
  • Longevity-conscious dimensioning and power management of the hybrid energy storage system in a fuel cell hybrid electric bus
  • Optimal dimensioning and power management of a fuel cell/battery hybrid bus via convex programming
  • A comprehensive review on energy efficiency enhancement initiatives in centrifugal pumping system
  • The dimensioning of PV-battery systems depending on the incentive and selling price conditions
  • Improving the dimensioning of piping networks and network layouts in low-energy district heating systems connected to low-energy buildings: A case study in Roskilde, Denmark
  • Economic optimization of component sizing for residential battery storage systems
  • Optimisation of the capacity and the dispatch of decentralised micro-CHP systems: A case study for the UK
  • Optimal capacitor placement for enhancing voltage stability in distribution systems using analytical algorithm and Fuzzy-Real Coded GA
  • Optimal energy management for a hybrid energy storage system for electric vehicles based on stochastic dynamic programming
  • Daylighting in buildings: Developments of sunlight addressing by optical fiber
  • Optimal operation, configuration and sizing of generation and storage technologies for residential heat pump systems in the spotlight of self-consumption of photovoltaic electricity
  • Cost-optimal energy performance renovation measures of educational buildings in cold climate
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Dear all,
What are the best techquines/procedures to integrate life cycle inventories (LCI) and life cycle impact assessments (LCIA) into energy system optimisation models (ESOM) (energy-focused IAM) to determine the potential impacts of industrial and urban decarbonisation scenarios and policies.
The emission factors used in energy models (e.g. LEAP) are mostly related to direct energy use (e.g. fuel combustion), and industrial process emissions are not always considered, which may lead to underestimated impacts.
Meanwhile, although life cycle assessment (LCA) provides relevant information about the total life cycle impacts of industrial processes, LCA methods not always consider future technology improvements and changes in economic and energy structures as they are usually focused on background data.
I would appreciate if you could send me some suggestions (links, papers, projetcs, comments) about best practices to integrate LCIAs into prospective energy models.
Thank you in advance for your attention!
All the best,
Joan Manuel F. Mendoza
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Good morning Johannes Morfeldt
Thank you for your reply.
We are aiming at modelling the life cycle environmental impacts of alternative decarbonisation scenarios for the iron and steel industry. To do so, we are exploring the adaptation and integration of LCI/LCIA data into LEAP.
I will read your article for additional insights based on your approach. Thank you very much for sharing it!
All the best,
Joan Manuel
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Energy coupling technologies connect two or more types of energy systems (energy vectors) to each other.
For instance, heat pump, electric/gas boiler, CHP/CCHP, fuel cell, etc., are energy coupling technologies.
In this context, what other technologies do you know?
The following work may be useful in this regard:
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I appreciate you for your helpful answer in enumerating an energy-efficient and eco-friendly energy coupling technology that is beneficial in exploiting geothermal energy.
Best regards,
Omid
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With community based energy systems, people in the same location can bring financial and other resources together and take up a project say an off-grid PV system that can supply their location, especially in remote areas.
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Dear Ssennoga Twaha , definitely right!
In Myanmar, the renewables based hybrid system is the feasible option for electrifying the remote and rural communities.
You can find my research articles on RG about off-grid Mini-grids in Myanmar.
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Remote rural community with abundant micro hydro and solar resources for electricity supply needs a model design using both micro hydro and PV/FC as energy inputs 
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Good answer by Debrayan Bravo Hidalgo
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(Serious and active members are required.)
My research fields are Renewable energy, PV systems, wind energy systems, multilevel-inverters, observers and state estimation, induction motor fault detection, and diagnosis.
- Write and publish research papers together
- Split the publication cost (APC) together if necessary.
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Dear Prof. Messaoudi,
I am interested to work with you since Renewable energy is one of my main and favorite research field. I have also completed a research in past based on renewable energy sources and their effectiveness.
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I am doing my masters in energy systems engineering, and I am looking for topics to do my thesis on; are there any suggestions?
I am interested in renewable energy.
PS: I have done my bachelor in mechanical engineering.
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Alternative and Renewable energy, solar, wind and geothermal power, brining down prices in the process about free of cost and highly demand world wide is.
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Completed PhD course work , working on synopsis considering the area of machine learning and control of RE systems. Done work on solar irradiance forecasting using ANN in MS research.
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Please see my profile
Best regards
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I am designing a control system for Hybrid renewable energy systems using Matlab/simulink/simscape, but currently having a problem. Whenever I run the simulation, I get the error shown below.
"The following block is not supported in Phasor simulation method: Block : FLC_HRES_Controller/Inverter (Three-Phase)/Detailed/Detailed Type : Universal Bridge "
What is the way around this?
Who will help?
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Dear Taofeek,
The concept of phasor mode is that the frequency is constant. In this case, the inverter will work as if it were a transformer. However, as your goal is to create a control algorithm, I think it is better to use the continuous/discrete mode.
Best Regards.
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Hello together,
I have modelled a compressed hydrogen storage tank within an energy system model in hourly resolution based on mass flows into and out of the storage tank in Microsoft Excel. Consequently, I know the input and output hydrogen flows, that are necessary to operate my system. I attached how my data looks like in the Excel file. Now I want to know the pressure level of the storage tank, as well as the volume of the storage tank, when defining a minimum and maximum pressure level of the storage tank of 30 and 80 bars, respectively.
Could someone describe a suitable approach to solve my problem?
Thanks a lot!
Best regards!
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Hope you are well!
I will give a conceptual answer and then you can implement.
You have the input flow and the out flow from a hydrogen tank and you want to determine is size given the maximum pressure.
You can get the maximum stored hydrogen by calculating maximum the difference between the total input flow and the total output flow
Hence:
The maximum stored hydrogen= Maximum( total input flow -total out[put flow)
So you need three columns for the total input flow, the total output flow and the difference and then the maximum difference which will be the maximum stored hydrogen, MSH.
Assume that the units of this stored hydrogen is in cubic meter at standard conditions of pressure and temperature.
Then all what do you need to get the volume V of the tank is to divide MSH by the maximum pressure P^.
Then you need to check only the minimum level of the gas by similarly calculating
the minimum stored hydrogen, MinSH divided by the calculated volume of the tank V, That is the minimum pressure= MinSH/V.
Best wishes
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The grid extension has long been the primary means of electrification of the region. However, connection to the grid is most of the time practically impossible due to geographical remoteness, thick jungles, rugged terrains, high costs of supply, low household incomes, low consumptions, dispersed settlement of consumers, and inadequate road infrastructures. As a result, decentralized diesel generators are most often used for rural electrification in the region. However, the high costs that are associated with the transportation of fuels and the maintenance of those systems make them unsuitable for rural electrification in developing countries. On a world basis, fossil fuel resources are experiencing a rapid depletion, resulting in an ever-increasing price which tends to make them unaffordable for developing nations. The growing evidence of global warming phenomena due to the release of greenhouse gases when burning those fuels is another critical reason for reducing our dependence on them. Therefore, finding alternative energy sources to meet the growing energy demand while minimizing adverse environmental impacts is becoming an imperative task.
Renewable energy sources, namely solar, wind, biomass, geothermal, and hydro, being inexhaustible, locally available, free, and eco-friendly can constitute potential sources of alternative energy, especially for local power generation in remote rural areas. Increasing interest has been given to their utilization since the oil crises of the 1970s.
The main drawbacks associated with the utilization of renewable energy sources are their unreliability and inability to work efficiently due to their intermittent and fluctuating nature, which generally leads to the over-sizing of the system, thereby increasing the investment cost.
How can hybrid renewable energy systems constitute a sustainable way for meeting the challenges of rural electrification in sub-Saharan Africa?
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Hi. Since it is a desert then it is full of solar energy . Using trough collecters is enough to give electricity to the whole area or by using PV cells is also another technique to produce electricity in that isolated areas.
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This is the first time that I had submitted a paper to a special issue of IET GTD "Future Distribution Grids and Integrated Energy Systems (IES)". The submission deadline was 31st March 2021. I wanted to know if any researcher here submitted their paper to this special issue or if anyone had experience with the timeline for their first review. Thanks
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Thanks
Omar H. Abdalla
, I contacted the journal and even after 4 months, the editor is still waiting for reviews from 1 more reviewer. Pretty slow indeed.
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Hi everyone
How to model Supercritical water gasification (SCWG) process in Homer software?
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Did you check the possibilities of Homer pro Biomass Module to integrate this Special fiel combination?
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As we know that wind is continuously varying in nature, so, the PMSG output voltage could be varying in these scenario how to design a DC-DC converter to get 339 volt constant DC output.
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[(Wm * Tref)/Vd ] - [ Ia] ----> PI controller and pulse generator, you will find the control of DC/DC converter
Best regard
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Hello Scholars, I am exploring "trust" relevance in the development of socio-technical systems. What is your perception of cognitive values like trust to the energy transition/implementation of innovations? Could you please recommend articles on how trust is understood and studied in this context?
Many thanks, kind regards
XD
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Dear
Jimmy Y. Zhong
and Detlef Ruschin
Thank you so much for your reply and the references mentioned.
I can see a link of observational and informational trust with the concept of dependability. That cames from system engineering as a measuring tool based on integrity, security, reliability. I will take this into account in my research (if you have any other reference it will be amazing if you remind to share here).
However, when it comes to socio-technical systems (where there is an interdependency), cognitive factors should be considered. As humans are barely predictive, trust in society will always be a dynamic parameter. Actions will lead to reflection + reaction, from an individual (trustor) towards the trustee. The individual will base the judgement on his subjective perceptions of what is considerer trustworthy or not. Such perception can also change based on his personal experience and how external factors influence/impact the trustor.
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The hourly load curves of the selected household in each season are shown in Fig. 28.
Figure 28 shows the demand for electricity in four months on an hourly basis. Can you explain this diagram to me, is this the average consumption curve for one day or the total consumption of days in a month summed up in specific hours?
Figure 28 is attached to the question
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The values of the electricity consumption is given per hour averaged on the whole month. So
Mathematically Average hourly consumption along one month of the year=
SUN one hour consumption in kwh from day one to the end of the month. divided by the numbers of days in month. January is the highest consumption may be due to heating. Some hours in the summer days the consumption increases because of air conditioning at the nun times.
Best wishes
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Power-to-heat (P2H) shows how we can use renewables for heating. Power-to-heat technologies have been on the market for quite some time now, with heat pumps being the most important. However, they are only efficient at lower temperatures. Whenever very high temperatures are needed – for example, in the industry – electrode boilers are used.
So what do you think? Which technologies do you think will substitute the current fossil-fuel-based heaters in the future European energy system?
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I think the major source will be direct solar heaters. Especially in the European countries in the south and east of Europe where they are rich with solar radiation.
For very controlled heating for industry one has to use the photovoltaic generators.
Best wishes
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In Bangladesh, the proved reserved of natural gas 34 TCF which will lead the country next 20 years and currently 82% natural gas consumed in the power sector for power production. Whereas only 3% of electricity produced from renewable energy sources. However, there is an immense interest in using renewable energy like solar, biofuel, geothermal, wind due to environmental and economic concerns [Uddin et al. 2019].
Do you think Bangladesh can do it in the long-term, for example in the year 2100? If "yes", how? If "No", why?
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I am not very aware of the availability of land for solar power installations in Bangladesh. The interesting with the increasing the solar cell conversion efficeincy, the area required will be reduced. The other important factor is increasing the utilization effeciency of the electricity by smart control one may reduce required electricity supply.
Best wishes
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Colleagues, good afternoon! I was wondering what problem is the most urgent at the moment in the operation, design of gas turbines and combined cycle plants. Influence of gas turbines on the steam circuit, power reduction during summer power limitations. maybe the quality of fuel and self-contained liquids?volume_upcontent_copysharestar_border
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I will be guest editing a Special Issue "Climate Variability Impacts on the Energy System". The Special Issue covers issues relating to climate variability and change (CV&C) impact on the energy system and energy system transitions.
Examples of topics within the scope of this Special Issue include (but not limited to) the following: CV&C impact assessment on the energy sector, energy security and SDGs; technology solutions to address CV&C impacts; and robust policies to support the decoupling of GHG from the energy sector.
Original and review articles are welcomed. I look forward to your contributions. See the link below for more details:
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A changing climate has potential effects on the electricity sector, for example with respect to hydro-electric flow (in summer, and from snow melt), from wind resources, and from water abstraction for large generation plant.
I attach a report (sorry, in French) on this aspect in Swizereland.
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Is it possible to simulate a environment of energy system combine with Solar, wind and traditional energy sources. Please suggest me some software too.
Even the energy conversation, efficiency calculation and economical viability matching.
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Yes, it is possible by using different programming and software as:
1 RETScreen
2 LEAP
3 HYSIM
4 iHOGA
5 ARES
6 SOMES
7 RAPSIM
8 Hybrid2
9 INSEL
10 HySys
11 Dymola/Modelica
12 HOMER
13 Matlab
Best regards
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In the last years, I have been observing a growing trend of publications on long-term city/urban energy planning based on energy scenario assessment and making use of simulation and/or optimisation modelling tools such as LEAP, MARKAL/TIMES, or even ad hoc created energy models to evaluate different visions of the sectors and specific technology penetrations. In Europe, for instance, results from the FP7-INSMART project seem very interesting (https://cordis.europa.eu/project/rcn/186975/en).
Opinions? Ideas? Approaches?
Regards
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LEDS-EEP City Energy Planning Toolkit By:
Judit Bálint, Eduardas Kazakevicius, Thor Morante Brigneti
City Energy Planning Toolkit
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I am working on the planning of the integrated energy system considering the uncertainty of wind and photovoltaic energy, I want to find a Matlab code about this. Can anyone help me?
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You can try to visit
specify the output format and location on the Publish settings pane
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Hi
Please if you have the template... Kindly share at your earliest convenience
Thank you in advance :)
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Thank you Mr. Edwin for your guidance
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I would like to research on 'waste-to-energy' system for my undergraduate project but I am struggling to come up with an Electrical discipline of the topic that will only focus on the Electrical part of 'waste-to-energy'.
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I can see why you might not want to dive deep into chemical aspects of a process, but why not thermal? Even so, there are purely electrical aspects of power generation that can be improved through further study. Have you considered power factor control? That's the phase between the voltage and current on a three-phase power grid. While it might be close to unity in the US, Canada, and parts of Europe, it's often quite variable in developing countries, which can pose challenges. Frequency control (50/60 Hz) is another issue that's entirely electrical. How might waste products fit into this? What about load following using landfill gas only during periods of peak demand? What about only processing waste during periods of off-peak demand? This could be as simple as only refilling the water tank on the hill in the middle of the night when demand for power is lowest.
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I am trying to solve a hamiltonian with 10 nuclear centers with Z=1 and located in arbitrary locations (assumed no symmetry in its arrangement). For the the given set set (classical ) nuclear centers, I have a single moving electron around it. Here we have treated electron alone as a quantum particle. Pyscf gives me only ground state energy of the system. However how do I get excited states of this Hamiltonian. Is there any freely available software where I can get excited state eigenfunctions and eigen energy values ? Can ORCA do this job ?
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Try QUTIP first and then qiskit IBM
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I am looking for a simple exercise (can be done even at home) to breakdown most of the muscle ATP-PC storage. What do you suggest to me?
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Wingate (30s all out in a bike using p.e. 7.5%-10% of your body weight as resistance). it will use that energy system, at least for the first part of the exercise.
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I have come across the terms multi-agent systems, multi-agent models, and agent-based models in the literature. It seems some authors tend to use these terms interchangeably while some prefer one over the other. But do they mean the same thing or do they refer to different things? After thinking about this, I drafted a way to make this differentiation as follows. I would appreciate it if you could let me know what you think about it, whether you can reasonably agree with me or whether you have a completely different opinion.
multi-agent system - a complex, real-life system where many independent and inter-dependent agents simultaneously interact to reach a system-wide outcome within a set of pre-defined constraints.
multi-agent (or agent-based) model - a computer-based (often simplified) simulation model of a complex, real-life system where many independent and inter-dependent agents simultaneously interact to reach a system-wide outcome within a set of pre-defined constraints.
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You are correct many authors do use the term interchangably. Saw a presentation yesterday where they used the term MAS. But i would define it as an ABM
Here is how i think of the two
MAS. Usually applies to engineering problems eg in telecoms eg using the Jade system for example. Looking to solve a real problem or to complete a task. MAS systems usually have sophisticated communication systems between agents eg using say FIPA standards. Agents are trying to find a method or set of behaviours to complete a task. MAS therefore has multiple interacting intelligent agents. In many examples many agents are used to solve a task. Rather than just one agent.
ABM usually involves modelling behaviours of agents with set rules and simpler communication protocols eg simulating human behaviours in a social setting Agents are given rules and the simulation looks to see how systems may respond. In essence The goal of an ABM is to search for explanatory insight into the collective behaviour of agents (which don't necessarily need to be "intelligent") obeying simple rules, typically in natural systems, rather than in solving specific practical or engineering problems
Gary
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I am using the VMD plugin QwikMD to do MD simulations of my protein-protein complexes. Hereafter I am using the NAMD2 analysis to calculate my total energy of the system along with all of the other energies. I want to find out whether my reasoning is correct: If I have protein A, B and the complex AB, would it be correct to take the interaction energy as the average total energy of each separate simulation and have Binding energy = energyAB - energyA - energyB? I am also doing a simulation in the presence of metal and without metal where binding energy would be BE = MetalBound - MetalFree. Is this the correct approach for a simple estimate of binding energy?
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You can use MolAICal ( https://molaical.github.io) to calculate the MM/GBSA based on the simulated results of NAMD2. Please see the tutorial: MM/GBSA tutorial by NAMD and MolAICal in the website: https://molaical.github.io/tutorial.html
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Hi everyone,
I am working on a project on digsilent, and i would like to know how i can run this optimal power flow analysis.
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Actually, I am trying to solve a highly non-linear problem regarding energy systems. There are 8~14 variables are involved to predict the energy of the system under uncertain 3~4 variables. All the variables are floating-point numbers.
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As much as you input data for SVM, you will get more accuracy for your model.
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Dear researchers, could you please help me with my question?
I would like to know how I can run multiple optimizations in one program...?
All the optimizations are the same in terms of variables, parameters, and sets but with different input data. The input data are being read from some mxn matrices. The number of optimizations is m. The output of each optimization is supposed to be returned in an mx1 matrix and the variables in some mxn matrices. Therefore, I wrote the objective function equation like this:
obj(m).. cost(m) =e= sum(n, f(m,n)) ;
However, it doesn't work and returns this error:
148 Dimension different - The symbol is referenced with more/less indices as declared
I even tried loop but it didn't work.
Any solution is appreciated. Thanks in advance.
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Dear Hooman,
I think you can use the "loop" as this form:
obj.. cost =e= sum(n, a(n)*p(n)) ; %%% f(n)= a(n)*p(n)
loop(m,
a(n)=m*... or a(n)=a_m(m,n) , ...
Solve min/max cost,...
cost_m(m)=cost.l; , ....
);
Best regards;
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I need for software for modelling of a hybrid energy system (PV + Wind)
Anything except Homer
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Dear Emmanuel Vincent Philip,
This link maybe useful for :
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I want to simulate a part-load operation of coal-fired power plant. I have tried to implement Stodola equation and mass and heat balances through Fortran code but got issues in the cycle convergence.
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Dear Dawid,
I would advise use MATLAB instead of Fortran code for steam cycle performance.
Power plant can use couple of process simulators such as e.g. Aspen Plus, Unisim, and Pro II. . To evaluate the model’s performance, its predictions may be compared with those of an equivalent model from Gate Cycle or other cycle. Use the Steam table for steam, count enthalpy values of cycle performance, and predict the inlet temperature, mark steam deviations and efficiency range. Just assume, the relative deviations in the plant power output and efficiency must be less than 0.65% for 100% loads. Use MTALAB, it can solve your issue(Reference: Aklilu and Gilani adopted the normalized parameters from to describe the characteristics of compressor and turbine and developed a simulation model in MATLAB to identify the plant operation mode from field data. Zhang et al).
The simulation can follow the recycle modules.
The following assumptions perhaps you have made for simulating the pressure in power plant using Aspen.
1. Plant at Steady state (2) Fuel combustion (3) Cooling water flow (4) No water leak.
Refer the site:
file:///C:/Users/3020/Cookies/Desktop/Downloads/SimulatingcombinedcyclegasturbinepowerplantsinAspenHYSYS.pdf
Ashish
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I have studied some papers in which the energy consumption of air conditioner (and refrigerator) on fan mode (when the compressor is turned off) have considered negligible and they have ignored it.
Could you please express your comment or observation and introduce to me some papers that have evaluated it particularly?!
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When the compressor stops and only the fans run, the power consumption can be one tenth of the total consumption of the air conditioning system. This is because the mechanical compression process requires much more energy than fans use to move air through the exchangers. Basic knowledge of thermodynamic theories explains this difference between the consumption of the cooling system while only the fans operate.
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I am working on the optimization problem of multi-energy system using benders decomposition algorithm approach. I have written the subproblem and the master problem separately as a function using Matlab, but the benders algorithm I developed is not working as expected. Please your support will be appreciated, I need benders algorithm template in Matlab.
Thanks,
Michael
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And if the model is not stochastic?
Check out Leon Lasdon's book on large-scale optimisation, called
Optimization theory for large systems
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Suppose, I have one-year hourly electric load data(8760 data). I have also wind speed and solar irradiance data for one year (8760 data). I want to optimize the battery size, no. of the wind turbines, and no. of the solar panel. The optimization algorithm could be anything (either MILP or metaheuristic). The objective function is the Cost of Energy. I have the constraints for the problem.
I know the optimization technique for the single point (if there is one electric load data point, say monthly average data).
How should I go for the optimization if there are 8760 points? If I run a for loop in MATLAB, I will get one set of solutions (the battery size, no. of the wind turbines, and no. of the solar panel) for each point; that means I will get 8760 sets of the solution? In this case, which set is the optimal solution?
Or should I consider the worst-case scenario(max demand and least generation) and optimize the system based on the worst case?
Can anyone please help me with this problem?
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Dear Muhammed
Surely you should consider the worst-case scenario and optimize the system based on the worst-case, you must use an intelligent algorithm that attempts to give you the optimum number of elements of the hybrid system. You can visit my account and see my papers if you need any question do not hesitate.
Best regards
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Good day,
For those who are already in the field of research and technology, specially in Renewable Energy Systems, I just want to know what are the necessary steps to be taken in order to become a successful Researcher and Scientist in the future. How can we be successful in searching for jobs in Research and Development Sector?
Thank You and Best Regards,
Almontazer
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There are many components to a successful research study and many questions that researchers must consider in order to develop a relevant and viable project.
In order to find a topic, the researcher must first identify the goal of their research. Is it to improve or advance a program or intervention, to establish basic data on an unknown topic, or instead to test an educational innovation? Answering this broad question will help you to hone the possible topics of your study.
Oftentimes, students as well as professional researchers discover their topics in a variety of conventional and unconventional ways. Many researchers find that their personal interests and experiences help to narrow their topic. For students, previous classes and course material are often the source of research ideas.
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what is the main benefit to integrate DIgSILENT and Matlab/Simulink to simulate the power system with renewable energy system?
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DlgSILENT offers excellent tools for analyzing all power generation components and offers a vast array of functionality perfectly suited to provides comprehensive modelling features for studying all kinds of electrical networks.
DlgSILENT provides all the necessary functionality to conduct complex studies for the integration of renewable generation into distribution, transmission and industrial networks, which is nowadays one of the key issues in network planning and analysis. A full set of tools is provided to undertake the wide range of studies required for grid connection and grid impact analysis of wind parks, PV generation and all other renewable energy power plants. Recurring tasks can easily be automated using scripting tools, to streamline the analysis process.
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I'm currently doing my BEng in manufacturing engineering but am moving to do a masters in energy systems come September. While I am looking forward to the course, I am a little stuck for inspiration as most of my ideas are lacking in complexity.
I'm just curious to see what kinds of topics come from asking this, if any.
Thanks,
Sean.
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Cybersecurity of Power and Energy Systems is a topic with many questions yet to be answered. This research area is roughly 50% on computer science and 50% on power and energy systems.
Also, Power Quality of Energy Systems with High Penetration of Renewable Energy is another important area with many unanswered questions.
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Hello dear researchers
It's been for a while i am working on Renewable Energy Sources and especially sizing of the hybrid systems considering the uncertainty of the generation and economical criteria.
Now I am going to move a little bit forward and start a new project related to my prior study.
What are your suggestions?
Many thanks indeed.
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Dear Reza Faraji
Although the topic has been well studied in many papers
But there are still important topics. However, any a new study can be essential and useful.
Look at topics of recent papers and try to apply some of these studies on your country or countries where the research has not taken place. Any subject can be of benefit in changing the goal type, reliability, and the methods used to reach the solution. A multi-goals paper will be valuable.
Look at the topics of my papers on RG these researches can guide you to a new idea.
Best regards
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Hello,
I'm simulating a Gas Turbine Cogeneration System and I'm trying to minimize the total cost of the cycle based on the approach proposed by (Valero, Antonio & Lozano, Miguel A. & Serra, Luis & Tsatsaronis, George & Pisa, Javier & Frangopoulos, Christos & von Spakovsky, Michael R., 1994. "CGAM problem: Definition and conventional solution," Energy, Elsevier, vol. 19(3), pages 279-286), the so-called CGAM model, and also presented in Modeling, Analysis and Optimization of Process and Energy Systems by F. Carl Knopf (Chapter 10: Gas Turbine Cogeneration System Economic Design Optimization and Heat Recovery Steam Generator Numerical Analysis (Pages: 243-271)). Instead of using VBA in Excel as proposed by Knopf I would like to use Aspen Plus. I'm considering the same decision variables as well as constraints for the problem without success. Does anyone have any helpful material about EO Optimization in Aspen Plus? It would required a custom function.
Thanks
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I think Ihtishamul Haq is working on Aspen plus, you can consult him.
Thanks
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Hi all,
        I am working on a renewable energy system project. I need a Matlab simulation file for a pv system without mppt.
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Dear Balamurugan,
There is complete matlab code and mode extraction for the solar cells and solar panels in the book chapter:
Best wishes
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I was trying to calculate binding enrgy between 35-45ns MD trajectories the solvation energy of the system is hig because of this I got ΔG positive value. can any one please.
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Mmpbsa sir
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Well for the metal n-type semiconductor Schottky barrier height is the difference between the metal’s work function and the semiconductor electron affinity
and the built in potential is obtained from the difference between the schottky barrier height and the energy energy difference of conduction band and the common Fermi energy in the system.
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I'm attaching a reference from a book in Semiconductor Physics from the University of Berkeley, this book is very basic but it has some information I think it can help.
Inside you will be able to find some expressions to compute the Barrier Height for a Schottky barrier, as you where looking for.
As for the Built-in Potential, I'm affraid this one is more subtle and not as straightforward ...
There is a very simple method describe in one example included in this book. They ask you to plot a V vs. 1/C2 plot. Where V is the Applied Voltage for the junction and C is the junction's Capacitance. And then, the method points one do have to adjust the experimental data points to a liner model, one with positive slope, from which one you would be able to obtein the Built-in Potential.
I sometime ago tried to do this, but there are so much practical complications, and they don't explained further, I traried to search it on other references, but never been able to find it, I don't know if it can be helpful, but anyways I recommend you to give it a look.
The issue with the above mentioned method to plot the Voltage vs. Capacitance is that I don't think the experimental points for these measurements (Voltage-Capacitance) provide you data you can adjust fairly to a linear model, at the interested region. So if you look for these methods (or characterization methods) in articles in the literature, you will find other models (a square, cubic , etc.. ) more suitables for these experiments. I'm trying to remember that a square model can be fitted more accurately with the measurements. But when I did these characterizations I was interested in getting the Built-in Potential for a p-n junction, not a Schottky.
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I am wondering if there are any common test cases for multi-energy systems / multi-commodity systems?
I'm particularly interested in electric distribution system + district cooling system.
So far, the most detailed test case I have found in literature is the "Barry Island case study" from https://doi.org/10.1016/j.apenergy.2015.01.102
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Maybe the IEEE European Low Voltage Test Feeder case helps you : https://ewh.ieee.org/soc/pes/dsacom/testfeeders/. It consists of 55 residential buildings and a radial networkwith 4 branches. This paper used it as case study:
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As per second law of thermodynamics, all of the heat added to a system cannot be used to do useful work. Also, another version of second law of thermodynamics states that entropy of a system always increases. Does it implies that heat added to a system is used partly in doing useful work, partly in increasing the internal energy of the system and partly in increasing the entropy and as entropy of the system always increases so all of the heat added to a system cannot be used to do useful work?
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Dear Katyal
The second law of thermodynamics known as a non-reversible law, that means at any movement of the system boundary there is an entropy generation this called the entropy generation due to the work. As well as the heat transfer to the system causes two types of entropy, the first one is the entropy generation and the second is the entropy transport.
The entropy generation due to work and heat always greater than zero. While the entropy transport due to the heat transfer can be negative or positive depending on the direction of heat flow. Thus, the heat flow to the system produced useful work and part of the heat is lost as entropy generation and entropy transport.
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Dear researchers, I'm working on the energy management of a renewable energy system that consists of '' PV-BATTERY-SUPERCAPACITOR-DIESEL '' distributed energy resources DERs. I need to represent the generated power of the diesel generator as a function of the consumed fuel. Is there any equation or function that represents this generated power?
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The matter is not complicated as if you know the conversion efficiency, then you can express the output power po as a function of fuel consumption. then
po= Eta pi, where pi is the fuel consumption rate in KWh and Eta is the conversion efficeincy. I think there are such curves or values of the efficiency. You can also take the po as a function of fuel curves and curve fit them and use them in your model.
Best wishes
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Asking for the description or references of the methodology on which the energy systems simulation of the Spine toolbox is based
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Thanks!!!!!!!
I will do ASAP!
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Oman has different areas in nature on the Gulf, the sea or desert ... Can you identify a particular area as the best area for a solar energy system?
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Dear Dr. Algburi,
As known, dust and high temperature effect significantly on the electrical performance of the photovoltaic systems. In my opinion gulf area or sea are better options. Moreover, maintenance cost will be higher in a power plant in the desert. Sea breeze can decrease the surface temperature of the solar panels. On the other hand, photovoltaic-thermal (PV-T) systems can be utilized to produce both thermal and electrical energy. With this technology, PV temperature also can be decreased. To make better decision, prototype systems should be investigated in various regions.
Regards
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I have performed a long MD simulation of lipid rafts formation using MARTINI force field. After that I have converted the system to atomistic model (using built in CHARMM-GUI converter).
After all, I want to minimize the obtained system, but I got fatal errors from GROMACS, saying, that lipids in the membrane have some bad interactions. Then the programme stops working, because of very high energy of the system (even though it has not reached the set number of steps...).
I am wondering if I could change the constraints in .mdp file to "none" instead of "h-bonds"?
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You will still have to minimize with appropriate constraints later, otherwise the geometries may be incompatible with the subsequent dynamics that require the use of constraints.
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Renewable Energy has a greater scope in research and job opportunities now and it will continue in the future also. Mathematical modeling of the renewable energy systems is highly important to improve the performance. Many expensive softwares are available for the same, which are not that affordable by developing nations. So could you please list some of the open source softwares know to you related to Renewable Energy Systems? Share the link also (if possible).
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I was too harsh in my comments about EBSILON. My team did find that it was the best currently available alternative to GateCycle V5.61. EBSILON has many excellent features and additional capabilities. I faced the challenge of being given only 80 hours (determined by Sales & Marketing) to develop a system model, validation cases, and a complete set of correction curves. Our director insisted on 0.1%/0.1° agreement with design heat balances and 0.2%/0.5° agreement across the range of corrections, demonstrated by random cases. This was very difficult to achieve with GateCycle, but much more so with EBSILON, given the available controls and adjustments. Forcing a model to fit the EPC's heat balances, which contain multiple unspecified and proprietary margins, is a daunting task indeed. This raises an issue of much debate: how I (the performance testing engineer) think a system will perform vs. how they (the EPC's engineers) are willing to guarantee it will perform (including possible liquidated damages). If I am not liable for the liquidated damages, I don't get to decide how the system "should" perform, which means I don't get to loosely match the information provided. This is implied in ASME PTC-46, depending on who you ask. As a performance testing contractor, it was my responsibility to represent as accurately as possible what the EPC committed to delivering, not how I thought a system was going to perform. When a big discrepancy arose (and they occasionally did), I informed the parties that there might be a problem meeting the guarantees. If the performance test proved otherwise, that's OK. EPC's engineers will tell you stories like... This vendor always come up 5% (or 1°) short, so we just add 6% (or 1.5°). We save $20M on the project, come in lowest bidder, and still achieve the guarantees without getting sued. If time were not such a hard constraint for me (as in a nuclear plant, for instance) or if agreement with an EPC's margins were negotiable or if I were designing the system (rather than working with someone else's design), the evaluation criteria would be different, as would my conclusion. The fit between GateCycle V5.61 and the performance testing company I worked for was fortuitous indeed. I think 80 hours is unreasonable for such a complex task, but that's the market reality I had to work with. I should think EBSILON an excellent choice for many other circumstances and applications.
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Which technology will dominate in future? Why do you think so?
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Both technologies are older than combustion system. First fuel cell was designed by Wiliem Grove in 1839 based on theoretical work of Christian Friedrich Schönbein in 1838 and first electric vehicle come up in 1835 and constructed by Sibrandus Stratinghem and Christopher Becker.
I can say that It doesn't matter who win this battle, the winner will be people and Earth's environment because we will have traffic without pollution and CO2 neutral as it is supposed. However, I can continue by many arguments why both solutions might not be so clean as we think at the first sight. It depends how the electricity is produced, how much energy is needed for producing of batteries and influence on environment in overall. And similar for fuel cell vehicles, it depends how the hydrogen is produced because decomposition of natural gas, which is most frequent way now, does not make sense with respect to the environment.
Actually, there is also 3th fighter - modern and redesigned combustion system as diesel or gasoline or even CNG which is interesting too. Again, it depends how the fuel is produced and synthesized. There has been done also big effort which is recently accelerated due to pushing down the emission limits.
Back to battery car vs fuel cell car. Even though my research field is fuel cell technology I admit that there is no reason to use sophisticated system as FC if you want to cross distance 10-15 km each day (work-shop-home triangle). Small electric car can do good job in this case. On the other hand you can go also by bus or by bicycle, which is definitely the best solution with regard to environment.
In case of this small electric car it is necessary to produce electricity by "green way" without burning coal or natural gas otherwise use CNG will be more effective and environment friendly for sure.
Electric car use battery for storage where the ratio:
ratio = (electrons released)/(protons in the system)
is always lower than in case fuel cell where this ratio for hydrogen is 1 = 2 protons/ 2 electrons. From this point of view, fuel cell car will be always more powerful. It will enable to cross longer distance and in addition it will produce heat in winter without loss of range. However, it depends how the hydrogen is stored. If we store hydrogen in metal-hydrides or even in heavy steel cylinders the above-mentioned ratio is decreasing. Lots of efforts have done in case of hydrogen storage and more efforts has to be done. I think that this ratio (electrons released)/(protons in the system) will be higher for FC car in the end especially for longer range of distances.
I think we will needs both technologies in near future and for longer distances the FC will be winner.
(I am sorry for longer text but it is interesting topic and thanks for question.)
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I'm going to work on a case study in context of WEF Nexus.I don't know how to define my system boundary in action which consists of three systems(Water system,Energy system,Food system) in order to work actual WEF nexus.Can anyone help me to tackle this problem?
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Thanks alot @ Md. Washim Akram , but i've read these article and I couldn't get my answer.
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Hello
In the attached file I mentioned functionalized graphene. Here I attached CH2Cl group to graphene by replacing one H atom of graphene ring. Now how I compute formation energy for this system? The formula I mentioned below is correct or not?
Ef = Functionalized graphene - bare graphene - CH2Cl
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The equation you put in your question doesn't match the stoichiometry of the reaction: formally, you are inserting CHCl into your Coronene/Nanographene slab, not CH2Cl.
The formula that Arezou Zarei brought up is the atomization enthalpy (=decomposition into single atoms), not the formation energy. The latter is defined as the energy required to form the compound from the most stable modification of its elements (i.e. graphite, H2 and Cl2), so choose what you actually want.
If you want the formation energy: Since calculating an actual graphite crystal (=periodic boundary conditions) is probably precisely the thing you want to avoid, I would decompose the reaction as follows:
2Coronene(unfunc) + C2H2Cl2 -> 2Coronene(func.)
All those are close-shell molecules that DFT can handle pretty well with a strong functional. The formation enthalpies of both educts can easily be googled.
The reaction energy ER can be calculated both from the absolute DFT energies Eabs as well as the formation energiesEF:
ER=2Eabs(Corfunc)-2Eabs(Corunfunc)-Eabs(C2H2Cl2)=2Ef(Corfunc)-2Ef(Corunfunc)-Ef(C2H2Cl2)
Now all you need to do is calculated the three Eabs values, get the Ef values of your educts from the literature and calculate Ef(C2H2Cl2).
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Hello everyone
I would like to analyze the behavior of an ORC under off design conditions through the variation of the inlet evaporator temperature of the heat source fluid.
I calculated under nominal conditions the parameter UA using Q = F * UA * LTMD for a shell and tubes heat exchanger.
Would it be too imprecise to do this analysis assuming a constant UA coefficient equal to that calculated under nominal conditions?
I do not have the ORC evaporator design parameters so I can not recalculate the new value of UA for each new temperature profile.
Many thanks.
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Dear Miguel, you cannot assume a constant value of UA. The heat exchanger area A is fixed but the global heat transfer coefficient U depends of the properties of both flows: density, viscosity, mass flow rate, temperatures and, maybe the most important, the phase of the fluid. In off-design coditions, U must be calculated for each different condition.
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i want to learn how to implement a renewable energy system(RES) optimization problem in matlab using genetic algorithm.
thanks a lot.
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I suggest to see the Matlab section where users share functions and applications. For sure, there is something similar to your ptoblem
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Does anybody have a strong experience of multi-vector energy systems modeling using existing tools?
Suggestions on modeling tools that can do transport, power and heating system modeling in an integrated and dynamic manner while allowing renewable integration and optimisation would be much appreciated.
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Dear Mohammad, I developed many multi-carrier energy system models in MATLAB environment, if you are good in programming you may follow this way. Here you can find an example of my work on the topic (it is the only one published to date):
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Some people using 1 minute (time sampling) to record/monitoring data from energy monitoring system. I would like to know is there any international standard for minimum time sampling on data monitoring especially for energy systems in buildings. Thanks!
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The results from using MESSAGE software to simulate a Reference Energy System (RES) is often validated using an Analytical solution. Why is there usually a difference between the two values for Fresh feed, Separative work unit etc using Nuclear Power Plant as Example?
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Usually the difference between analytical and predicted values by simulation are not very large.
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Any thesis suggestions in renewable energy system??
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There has been a recent increase of interest in geothermal, specifically organic (and inorganic) Rankine cycle plants. Some have been built and more are underway. I have analyzed and tested several in North and South America and have contributed to the design of others. I provided testing and analysis for The Geysers plant in California, which uses the steam directly with barometric condensers. Recently, NOVEC 649 and 1230 have been declared the most "green friendly" refrigerants with respect to global warming potential. You can do significant modeling with Excel to evaluate various alternatives in design and working fluids. You can download a thermodynamic property Excel Add-In from my web site (http://www.dudleybenton.altervista.org/miscellaneous/NOVEC649.zip), as well as software to create a property Add-In for whatever else you might need. I attached a spreadsheet that solves a classic Rankine cycle as an example. You can also download a steam AddIn http://www.dudleybenton.altervista.org/miscellaneous/AllSteam102.zip
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Something on LEAP would be much appreciated.
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a few years back, we did some work on biomass using energy systems model. Project details can be found under https://www.psi.ch/en/eem/projects/chp-plant-swarm
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Can you also name the soft costs of installing solar energy systems?
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Thank you all for your insightful comments.
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I am currently working on optimizing a hybrid energy system. I completed the deterministic analysis and I got the optimal solution. For the non-deterministic analysis , I quantified the uncertainties then used Matlab for random sampling of the parameters and to generate the values of the objective function .
I need to know hot to carry out the sensitivity analysis in Matlab and how to generate Pareto diagram.
Thank you .
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There are several books of design of experiments where several common routines of sensetivity analysis are implemented in MatLAB
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thanks
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Dear Olusola,
As an advise you have to concentrate your search on the professors and institutions who make research and interested in your research experience.
In addition you have to prepare your C.V. reflecting your experience and your credentials not only in the PhD but also in the Msc and Bsc. Your performance in these earlier stages is also very important to get a post doctoral position.
You can access at first ask in Canada, USA, Australia, Europe and Japan.
Best wishes
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I'm an undergraduate student with a little experience using DFT.
I'm making a boron carbide (B4C) molecule in either Maestro or Avogadro (both seem equally intuitive) so that I can apply DFT calculations to them to determine the overall kinetic energy of the system. I've run into a few problems.
It's been found in other papers that the optimal structure for Boron Carbide is a dodecahedron with a Boron atom at each corner. Creating a dodecahedron made of boron and carbon atoms is rather trivial in either software that I'm using; however, minimizing the structure with the built-in software makes the structure unrecognizable and abstract.
Does this imply that I am building the structure incorrectly or is the relatively simple minimization software not able to recognize the dodecahedron as a viable structure?
With DFT, do I need anything aside from the coordinates of each atom (converted into whatever format is necessary for the software). I will be using ORCA for DFT calculations.
This is my first question that I've posted on a message board so feedback on my writing structure here would also be welcomed.
Thank you.
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I think the minimization you apply is force field based and doesn't seem to have meaningful parameters for the elements and geometry of your compound. You could try, altough demanding, a DFT based geometry optimization.
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Dear colleagues
We have developed a technique for revealing electricity market behavior. We need as much as practical data to show the effectiveness of our proposed technique. In this regards, we need data from an electricity market in which congestion is negligible, since our proposed approach does not consider congestion in this stage.
It is intended to apply the proposed technique from the prospective of an electricity market. Any guidance would be highly appreciated.
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Hello Dear Mohammed ,
according to my information, the electricity market depends on the country you are in and each country has its own market
You can determine your question, which country do you mean? Or you mean in general
Best Regards
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I am currently working on Thermal Energy Storage and interested in knowing that if we can use a Lumped Thermal Analysis to evaluate the discharge time for Latent Thermal Energy System.
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Lumped Analysis is applicable in the cases in which Bi number is less than 0.1. Bi is the convective heat transfer resistivity to conduction heat transfer Resistivity. in PCMs, phase change occurs which has a high convective heat transfer coefficient, and to use lumped analysis the thermal conductivity of the material must be very high.
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I have applied GWO to Optimize Hybrid Energy System. When I run the code repeatedly, the optimal solution is fixed but convergence curve varies. I need comment on it.
Thanks
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Dear sir
I have many papers in optimization. Please explain more about your problems
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EGM is a tool to optimize energy systems.
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Dear Mohammad
The total entropy generation of any system can be represented by two terms: thermal entropy generation (depends on the temperature difference) and frictional entropy generation (depends on the pressure drop). In some systems, the thermal entropy generation is dominant and in some cases vice versa. Compared with the entropy generation of the original design before optimization, it can be determined whether the improved design is better or worse. The design approaches the ideal state whenever the total entropy generation is as low as possible.
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A research question for Nano materials engineering applications in energy systems.
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I agree with all the above comments. One more significant reason is you have to trace any changes in your battery constitutes after long period of charging/discharging cycles not only to confirm the long-term stability of your material or to trace any structural changes but also to trace if any hazardous components come out
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Fellow Researcher can you please suggest a relevant PhD research topic in Renewable/Sustainable energy Systems? I'll appreciate if you can help me identify a clear problem and an incline to the possible solutions.
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As we move toward 100% non fossil energy we create a new problem. Will renewable energy have enough energy from day to day to power the energy needs of that day and the next day and the next day? In Texas several days of cloudy nearly calm weather in February create an energy shortage problem that is surprisingly worse than meeting summer loads. You can see some of the hourly data in this file I have posted which has links to the data https://egpreston.com/storage.pdf What is needed is long term low loss low cost energy storage but it does not yet exist. Some nuclear energy can bridge the gaps in renewable energy shortages.
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