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# Energy Systems - Science topic

Explore the latest questions and answers in Energy Systems, and find Energy Systems experts.

Questions related to Energy Systems

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.

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.

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?

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.

**Dear researchers,**

**Do you have experience on digitisation of urban energy system? If so, please leave some comments on below three questions. Many thanks!**

- What are the
**limitations**of digitisation of urban energy system in your projects, from aspects of data, coordination, capacity, finance, risks and so on. - What are the feasible
**business models**derived or based on digitisation of urban energy system in your projects? - What are the main
**barriers**for digitisation of urban energy system in your projects, and what are potential**solutions**?

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)?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

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:

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.

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

(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.

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.

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.

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?

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!

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?*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. ThanksHi everyone

How to model Supercritical water gasification (SCWG) process in Homer software?

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.

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

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

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?

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?

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_up

*content_copyshare*star_borderI 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:

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.

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

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?

Hi

Please if you have the template... Kindly share at your earliest convenience

Thank you in advance :)

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'.

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 ?

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?

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.

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?

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.

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.

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.

I need for software for modelling of a hybrid energy system (PV + Wind)

Anything except Homer

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.

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?!

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

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?

Good day,

For those who are already in the field of research and technology, specially in

**I just want to know what are the***Renewable Energy Systems,***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?***necessary steps*Thank You and Best Regards,

Almontazer

what is the main benefit to integrate DIgSILENT and Matlab/Simulink to simulate the power system with renewable energy system?

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.

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.

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

Hi all,

I am working on a renewable energy system project. I need a Matlab simulation file for a pv system without mppt.

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.

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.

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

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?

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?Asking for the description or references of the methodology on which the energy systems simulation of the Spine toolbox is based

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?

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"?

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).

Which technology will dominate in future? Why do you think so?

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?

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

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.

i want to learn how to implement a renewable energy system(RES) optimization problem in matlab using genetic algorithm.

thanks a lot.

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.

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!

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?

Any thesis suggestions in renewable energy system??

Something on LEAP would be much appreciated.

Can you also name the soft costs of installing solar energy systems?

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 .

I'm an undergraduate student with a little experience using DFT.

I'm making a boron carbide (B

_{4}C) 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.

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.

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.

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

EGM is a tool to optimize energy systems.

A research question for Nano materials engineering applications in energy systems.

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.