Lorenzo Talluri

Lorenzo Talluri
University of Florence | UNIFI · Dipartimento di Ingegneria Industriale

PhD

About

68
Publications
16,506
Reads
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619
Citations
Citations since 2017
66 Research Items
617 Citations
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
Additional affiliations
November 2018 - present
University of Florence
Position
  • PostDoc Position
November 2015 - November 2018
University of Florence
Position
  • PhD
December 2014 - October 2015
University of Florence
Position
  • Research Associate

Publications

Publications (68)
Article
Full-text available
Enhanced geothermal systems distinguish themselves among other technologies that utilize renewable energy sources by their possibility of the partial sequestration of carbon dioxide (CO2). Thus, CO2 in its supercritical form in such units may be considered as better working fluid for heat transfer than conventionally used water. The main goal of th...
Article
Full-text available
One of the main problems of current district heating networks is the significant heat losses that occur due to the high temperature of the heat distribution fluid (usually, water in the Italian climate conditions). Moreover, in ORC- or steam-turbine-based cogeneration power plants, the heat distribution fluid is heated directly by the condenser of...
Article
Full-text available
The exploitation of renewable energies is a solution to the energy, economic and environmental issues related to the massive use of fossil resources. Thus, investing in renewable technologies is essential to achieve the carbon-neutral scenario within 2050. In this framework, geothermal energy may have a key role. In particular, power plants with a...
Article
Full-text available
In this paper, the use of Metal-Organic Framework (MOF) materials as an option for the energy efficiency enhancement of HVAC systems is investigated. In particular, the possibility of using MOFs as dehumidifying materials to reduce the latent load associated with the moisture content of the airflows is studied. A literature review is proposed, high...
Conference Paper
Full-text available
In this work, a numerical code for the evaluation of air sanitation efficiency of UV-C devices placed in air systems (HVAC and MV) is presented. The code can design the sanitation section, giving the necessary UV-C power to achieve a predefined target of sanitation for a certain airborne pathogen. The code, through a three-dimensional discretisatio...
Conference Paper
The exploitation of renewable energies is a solution to the energy, economic and environmental issues related to the massive use of fossil resources. Thus, investing in renewable technologies is essential to achieve the carbon-neutral scenario within 2050. In this framework, geothermal energy may have a key role. In particular, power plants with a...
Article
Geothermal is a very promising renewable energy, which differently from variable renewable energies is independent of external/climate conditions and can cover both power and heat demands. Nonetheless, albeit these advantageous characteristics, traditional geothermal power plants may have not negligible environmental impacts: these range from emiss...
Article
Since the last decade of the 20th century, there has been increasing attention to the use of CO2 as a working fluid in transcritical refrigeration and cooling cycles. Transcritical cycles suffer from a heavy expansion loss, requiring specific means for its mitigation. Moreover, most applications for cooling or refrigeration are cooling a stream tha...
Article
Full-text available
This paper presents the study on the current developments of oxy-combustion thermodynamic cycles, which use the CO2 produced by combustion within the cycle itself without releases into the atmosphere. This is the cause of the attention paid to this type of technology and which makes these cycles one of the avant-gardes of power plants. In particula...
Article
Full-text available
This study aims to analyse an Ocean Thermal Energy Conversion (OTEC) system through the use of a Kalina Cycle (KC), having a water-ammonia mixture as a working fluid. KC represents a technology capable of exploiting the thermal gap of ocean water. This system was then compared with OTEC systems, which exploit ammonia, R134A and butane-pentane mixtu...
Article
In this study, a conceptual geothermal power plant with Non-Condensable Gases (NCGs) reinjection is analyzed from energy, exergy, exergo-economic, and environmental perspectives. The cycle is evaluated in considering both subcritical and supercritical working conditions. A sensitivity analysis comprising the variation of condensing temperature, tur...
Article
Full-text available
An economic assessment of different geothermal power cycle configurations to generate cost models is conducted in this study. The thermodynamic and exergoeconomic modeling of the cycles is performed in MATLAB coupled to Refprop. The models were derived based on robust multivariable regression to minimize the residuals by using the genetic algorithm...
Article
The scenarios on the future energy systems invariably point to heat pumps as an emerging technology to reach efficiency goals alongside energy and CO2 reduction targets. Moreover, they may progressively foster the use of chillers and refrigeration units. In this study, a technology that could enhance the efficiency of systems based on inverse cycle...
Article
The use of a binary cycle coupled to the complete reinjection of non-condensable gases could provide a valid answer to the improvement of the sustainability of geothermal plants. In recent years, the interest in the use of CO2 as a working fluid in transcritical cycles has increased. However, the low critical temperature of carbon dioxide (≈30 °C)...
Article
Despite the huge potential, energy harnessing from sea waves is often still at a demonstrative stage. Oscillating water column (OWC) wave energy converters have proven to be one of the few suitable solutions to this end. A wave-to-wire analytical code modelling an entire wave energy converter based on the OWC technology, operating with either a Wel...
Article
Full-text available
A comprehensive cost correlation analysis was conducted based on available cost correlations, and new equipment cost correlation models were proposed based on QUE$TOR modeling. Cost correlations for various types of equipment such as pumps, compressors, heat exchangers, air coolers, and pressure vessels were generated on the basis of extracted cost...
Article
This paper reports a comprehensive survey of well drilling time and cost. The models include both specific correlations on various well types and generalised correlations for rough estimation. The models are derived from robust multivariable regression to minimise the residuals. Africa has the highest construction cost component in well drilling an...
Article
Full-text available
This study deals with the life cycle assessment (LCA) and an exergo-environmental analysis (EEvA) of the geothermal Power Plant of Hellisheiði (Iceland), a combined heat and power double flash plant, with an installed power of 303.3 MW for electricity and 133 MW for hot water. LCA approach is used to evaluate and analyse the environmental performan...
Article
Full-text available
The Tesla turbine is an original expander working on the principle of torque transmission by wall shear stress. The principle – demonstrated for air expanders at lab scale has some attractive features when applied to two-phase expanders: it is suitable for handling limited flow rates (as is the case for machines in the range from 500W to 5 kW), it...
Article
Full-text available
Geothermal energy is a clean resource, which could significantly contribute to the reduction of greenhouse and other gas emissions by replacing fossil fuels for power generation. In many geothermal sites, the resource contains substantial Non-Condensable Gases (NCGs: CO2 and contaminants), whose emissions can be limited to developing power plant sc...
Article
Full-text available
Emissions of contaminants and CO 2 are becoming a relevant issue for the development of geothermal energy projects. Organic Rankine (ORC) Cycles present in this light particular appeal in the light of the possibility of total reinjection of the geothermal fluid resource including Non-Condensable Gases (NCGs). The Castelnuovo (IT) case study conditi...
Article
Full-text available
Ocean Thermal Energy Conversion is an important renewable energy technology aimed at harvesting the large energy resources connected to the temperature gradient between shallow and deep ocean waters, mainly in the tropical region. After the first small-size demonstrators, the current technology is focused on the use of Organic Rankine Cycles, which...
Article
Full-text available
Countries that are in the Great Rift Valley have one of the lowest average annual electricity consumption per capita in Africa with a value of 164 kWh per inhabitant. Furthermore, the electrification rate is 34% that is more than fifty percentage points below the world average, which is around 86%. One possible solution to improve the electrificati...
Article
Full-text available
In this study, turbine modelling of a geothermal sourced organic Rankine cycle (ORC) power plant is aimed. Thermodynamic model of the plant is constructed with the help of design and off-design plant data from an existing two-cycle power plant in southwestern Anatolia. Utilizing statistical analysis tools such as maximum likelihood estimation and p...
Cover Page
Full-text available
Dear colleagues, We are acting as Guest editors for a Special Issue entitled "Sustainable Geothermal Energy" in the open-access journal Sustainability (Impact Factor: 2.576). We are inviting you and your team to contribute with your valuable works to this special issue. The submission deadline is 30 November 2021. This Special Issue will focus on s...
Conference Paper
Emissions of contaminants and CO2 are becoming a relevant issue for the development of geothermal energy projects. Organic Rankine (ORC) Cycles present in this light particular appeal in the light of possibility of total reinjection of the geothermal fluid resource - including Non-Condensable Gases (NCGs). The Castelnuovo (IT) case study conditions...
Article
Full-text available
The surface equipment design for a binary cycle geothermal power plant including facilities required for the power cycle and the complete reinjection process of two-phase geothermal fluid (H 2 O þ non-con-densable gases (NCGs)) in the Castelnuovo area of Larderello are modelled. The proposed scheme includes the configuration of closed-loop power pl...
Article
Full-text available
In recent years the climate change issue, coupled with the concern of resource depletion, is favoring the blossoming of renewable energy conversion systems. Particularly, the development of new technologies for the combustion of biomass has drawn special attention to the possibility of coupling thermoelectric modules with stove-fireplaces. The curr...
Conference Paper
One of the global challenges of the millennium is bringing renewable energy conversion systems to an industrial maturity. Sea is an important resource in terms of extension and energy potentially exploitable by waves, currents, tides and thermal gradients. Amongst these physical phenomena, sea waves are the source with the highest energy density. A...
Article
The Tesla turbine - also known as friction, viscous or bladeless turbine - is a peculiar expander, whichgenerates power through viscous entrainment. In the last years, it has gained a renewed appeal due to the rising of distributed power generation applications. Indeed, this expander is not suitable to large size power generation, but it could beco...
Article
Over recent years, the Tesla turbine gained a renewed interest from the scientific community, as its simple structure guarantees low cost and reliability. These are key aspects for the success of an expander suitable for small-distributed energy systems. The reference case for the computational analysis was selected from the available data of an ex...
Article
Full-text available
Renewable energies are often subject to stochastic resources and daily cycles. Energy storage systems are consequently applied to provide a solution for the mismatch between power production possibility and its utilization period. In this study, a solar integrated thermo-electric energy storage (S-TEES) is analyzed both from an economic and environ...
Article
Full-text available
Geothermal energy is acknowledged globally as a renewable resource, which, unlike solar, wind or wave energy, can be continuously exploited. The geothermal fluids usually have some acid gas content, which needs to be precisely taken into account when predicting the actual potential of a power plant in dealing with an effective reinjection. One of t...
Article
Full-text available
Many geothermal power plants require systems for steam washing and treatment of non-condensable gases (NGCs). Steam washing is an early-stage unit and the NCG treatment is performed before the reinjection. The paper describes the potential methods for those parts of the process and evaluates the approach of scrubbers and the associated models. The...
Article
Vertical-Axis Wind Turbines are an appreciated design for small-scale units (Re < 5*10⁵, P < 15 kW), with demonstrated reliability and performance levels comparable, at such scales, to horizontal-axis design and also present significant benefits (no sensitivity to wind direction, simple construction). However, the fluid dynamics performance is limi...
Article
The increasing interest in micro power generation is pushing the research world to find new solutions for increasing the efficiency of micro Organic Rankine Cycles. One of their main issues is the efficiency and the reliability of the expander. The Tesla turbine is an old/new expander, which has found a renewed interest in the last years because of...
Book
Full-text available
The Tesla expander was first developed by N. Tesla at the beginning of the 20th century. In recent years, due to the increasing appeal towards micro power generation and energy recovery from wasted flows, this cost effective expander technology rose a renovated interest. In the present study, a 2D numerical model is realized and a design procedure...
Article
Full-text available
The growing demand for electricity produced from renewable sources and the development of new technologies for the combustion of biomass, arose a growing interest on the possible coupling of thermoelectric modules with stove-fireplaces. The current thermoelectric generators have a solid structure, do not produce noise, do not require maintenance an...
Presentation
Full-text available
The results of surface equipment design for the Castelnuovo geothermal power plant including the facilities required for the power cycle and the complete reinjection of the two-phase geothermal fluid (H2O + non-condensable gases (NCGs)) are showed. Steady-state and dynamic simulations were performed. The study includes the sensitivity analysis of...
Conference Paper
In recent years, research on environmentally sustainable energy production has endeavoured to exploit new renewable resources, as a consequence of the technological level increase. The harvesting of tidal energy has entered into an emerging interest. The utilization of tidal turbines could be very appealing in numerous sea locations, where local co...
Poster
Full-text available
Geothermal energy is sustainable, renovate and clean energy source. The geothermal power plant has lower emissions in comparison to traditional fossil fuel plants. Dissolved non-condensable gases (NCG) such as H2S and CO2 inner the geothermal fluids has increased their interest in the discovery and use of abatement systems. In this study, the remov...
Conference Paper
Full-text available
The aim of this paper is to assist the selection of the expander for small-scale organic Rankine cycles, based on an experimental comparison of piston, screw, scroll, roots expanders and Tesla turbine, the latter investigated by a specifically developed simulation model. First, based on a literature review, a comparison of these five expansion mach...
Conference Paper
Full-text available
The Tesla turbine-also known as friction, viscous or bladeless turbine-is a peculiar expander, which generates power through viscous entrainment. In the last years, it has gained a renewed appeal due to the rising of distributed power generation applications. Indeed, this expander is not suitable to large size power generation, but it could become...
Conference Paper
Full-text available
Over recent years, Tesla turbine gained a renewed interest from the international scientific community, as it combines reliability, efficiency and low cost. These are key aspects for the success of an expander suitable for small-distributed energy systems; thus Tesla turbine could represent an attracting solution for the market. The test case is a...
Article
The proposed Thermo-Electric Energy Storage (TEES) system addresses the need for peak-load support (1-2 daily hours of operation) for small-distributed users who are often owners of small/medium size PV systems (4 to 50 kWe) and wish to introduce a reliable storage system able to compensate the productivity/load mismatch. The proposed thermoelectri...
Conference Paper
A closed-loop ORC power plant layout including complete gas reinjection for the geothermal location of Castelnuovo Val di Cecina, Italy is proposed and analysed. The reservoir conditions correspond to a live steam field, with relevant contents of CO2 and acid gases in the resource. The proposed solution includes complete reinjection of the non-cond...
Conference Paper
Environmental and economic concerns are motivating manufacturers and public entities towards the use of renewable energy, which is continuously increasing its market penetration. Among the possible renewable energy resources, geothermal is particularly attractive compared to others such as solar and wind, mainly because of its continuity and dispat...
Article
Full-text available
A Thermo-Electric Energy Storage (TEES) system is proposed to provide peak-load support (1–2 daily hours of operation) for distributed users using small/medium-size photovoltaic systems (4 to 50 kWe). The purpose is to complement the PV with a reliable storage system that cancompensate the produc tivity/load mismatch, aiming at off-grid operation....
Article
Full-text available
Modern textile stenters are designed to reduce the inefficiency of the process and to recover the flow stream, which still contains a relatively high energetic value. In recent years, research has focused on the recovery of the energy content of the low-temperature exhaust flow; nonetheless, another important aspect that may increase the efficiency...
Article
Tesla expander is a bladeless turbine suited to low power range applications. In this article, a comparison between the performance prediction, as well as the assessment of the main flow characteristics, of a Tesla turbine working with organic fluids obtained through an in-house 2D code developed in EES environment and a simulation run with a compu...
Article
Full-text available
Even though textile industry is not considered an energy intensive sector, it comprises a large number of plants consuming and wasting a significant amount of energy that could be, at least partially, conveniently recovered. The objective of this work is to assess the possibilities and convenience of energy recovery from waste heat of different pro...
Article
Full-text available
The Tesla turbine is a bladeless expander; which principle of operation is based on the conversion of the viscous forces, developed by the flow while expanding through the rotor, in mechanical energy. It is especially suitable for small/micro size distributed energy systems (kW scale), mainly due to its very low cost, which results from the simple...
Article
The Tesla turbine is an original expander working on the principle of torque transmission by wall shear stress. The principle – demonstrated for air expanders at lab scale - has attractive features when applied to ORC expanders: it is suitable for handling limited flow rates (as is the case for machines in the range from 500 W to 5 kW), it can be d...
Article
In recent years, small-micro power generation was appointed as one of the proper solutions to tackle the increasing energy consumption, while opening the way to distributed energy systems and micro grids. The most interesting solution for small-micro power generation is the ORC technology, however, it still needs further developments especially reg...
Article
Wind energy is a mature renewable energy source that offers significant potential for near-term (2020) and long-term (2050) greenhouse gas (GHG) emissions reductions. Similar to all sectors of the transportation industry, the marine industry is also focused towards reduction of environmental emissions. A direct consequence of this being is a renewe...
Article
Full-text available
The Tesla turbine seems to offer several points of attractiveness when applied to low-power applications. Indeed, it is a simple, reliable, and low cost machine. The principle of operation of the turbine relies on the exchange of momentum due to the shear forces originated by the flow of the fluid through a tight gap among closely stacked disks. Th...
Article
The Organic Rankine (ORC) and Kalina (KC) Cycles represent two different technologies suitable to exploit low and medium temperature geothermal heat resources. In this work, the performances of KC, CO 2 and ORC cycles, the latter using different working fluids, for power generation from two geothermal fluid reservoirs are compared from an energy an...
Article
Axial flow turbines are the most common expanders for energy conversion. Usually axial flow turbines working fluids are air or steam; nonetheless, there is an increasing interest in evaluating this technology for Organic Rankine Cycle applications. In this field, because of the numerous possible applications, as well as the variety of specific work...
Article
The TESLA turbine is an original expander working on the principle of torque transmission by wall shear stress. The principle – demonstrated for air expanders at lab scale - has some attractive features when applied to ORC expanders: it is suitable for handling limited flow rates (as is the case for machines in the range from 500W to 5 kW), it can...
Article
The improvement of low temperature exhausts heat recovery network of an industrial textile - drying machine (Stenter/. Rameuse) is presented.A complete redesign of the layout of the water - gas heat exchangers network was done. The network was improved changing the original serial configuration of the heat recovery cells to a system with parallel m...
Article
In recent years, the increase in marine fuel prices coupled with stricter regulations on pollutant emissions set by the International Maritime Organization have promoted the research in new propulsion technologies and the utilisation of cleaner fuels. This paper describes a novel methodology to enable quantifying and evaluating the environmental an...
Conference Paper
The research deals with the possibility of effective exploitation of low temperature geothermal energy resources, which are generally much more widespread worldwide compared to conventional high temperature ones, typically available only in limited areas of the Earth. The basic idea is the application of an advanced binary cycle, only thermally cou...

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Projects (6)
Project
Dear colleagues, We are acting as Guest editors for a Special Issue entitled "Sustainable Geothermal Energy" in the open-access journal Sustainability (Impact Factor: 2.576). We are inviting you and your team to contribute with your valuable works to this special issue. The submission deadline is 30 November 2021. This Special Issue will focus on sustainable geothermal technologies, including different features, from reservoir modelling, to solutions for energy storage integration, non-conventional power plant solutions, innovative drilling techniques & fluids, and multi-product systems (electricity, heat, cold, and material streams). The general objective is to pave the way for the development of environmental-friendly geothermal systems. For more information on the Special Issue, please visit: https://www.mdpi.com/journal/sustainability/special_issues/Sustainable_Geothermal_Energy A limited number of discount-price Open Access vouchers are available to the Editors and you may consider applying for them by contacting us directly. Please be aware that these conditions will depend on the issue of the reviewing process. Thanks for considering it, and hoping you are well in these difficult times. We look forward to hearing from you soon. Best regards, Special Issue Editors Fausto Batini and Lorenzo Talluri
Project
The GECO project is industry driven. It is coordinated by Reykjavík Energy (OR), one of the most experienced, largest and oldest geothermal energy providers in the world. OR has been at the frontier of the geothermal development in Iceland for heat and power since OR leads a diverse and expert international consortium from throughout Europe. Zorlu Energy Group was founded with the establishment of Zorlu Enerji Elektrik Üretim Inc. (ZOREN) in 1993. It is a group of companies serving at a global scale in different fields of the energy. Graziella Green Power S.p.A (GGP) operates in the field of electricity production from renewable sources. The company is born in 2010 to produce clean and sustainable energy. From industry, GECO’s consortium partners are Zorlu Energy Group, Graziella Green Power S.p.A (GGP), STORENGY (Storengy), Green Minerals (GM). These industrial partners are joined by 13 Research and Technology Development (RTD) partners located in France, Italy, Spain, Norway, Turkey, Germany, UK and Iceland. These academic partners provide state-of-the-art analytical techniques and expertise and provide a link for GECO to help train the next generation of scientists to move EGS technology into the future.
Project
METU and a group of 17 partners across Europe have received a EUR 16 Million grant from the Horizon 2020 Research and Innovation programme. The funding contributes to the GECO project, GECO standing for “Geothermal Emission COntrol”. The project will advance the provision of cleaner and cost-effective geothermal energy across Europe and the World with reduced emissions of carbon and sulphur. The core of this project is the application of an innovative technology, recently developed and successfully demonstrated at a pilot-scale in Iceland, which can limit the emissions from geothermal plants by condensing and re-injecting gases in the subsurface, or turning them into commercial products. GECO aims to increase public acceptance and generalise this novel approach. To that end, the re-injection method will be applied in four distinct geothermal systems in four European countries: 1) a high temperature basaltic reservoir in Iceland; 2) a high temperature gneiss reservoir in Italy; 3) a high temperature metamorphic reservoir in Turkey; and 4) a low temperature sedimentary reservoir in Germany. Within GECO, gas capture and purification methods will be advanced by lowering consumption of resources (electricity, water and chemicals) to deliver cheaper usable CO2 streams as commodity to third parties. GECO’s unique approach consists of capturing the waste gases, dissolving them in the exhaust geothermal water stream, and re-injecting the aqueous solution. The re-injected acidic gas-charged fluid provokes the dissolution of subsurface rocks, which increases the reservoir permeability, and promotes the fixation of the dissolved gases by mineralization. The waste gases are therefore stored in the long term, in an environmentally friendly manner, while geothermal emissions are cost-effectively cleaned compared to standard industry solutions. A detailed and consistent monitoring program, geochemical analysis, and comprehensive modelling will characterise the reactivity and consequences of fluid-flow in the geologically diverse field sites of GECO. This will create new and more accurate modelling tools to predict the reactions that occur in the subsurface in response to induced fluid-flow, and favour the scalability of gas capture and purification. Finally, gas capture for reuse will be demonstrated by producing a CO2 stream with only trace H2S levels. This prerequisite for most utilisation pathways will be demonstrated as part of the GECO project. At a glance GECO aims to develop near Zero Emission Geothermal power plants. Project Co-ordinator: Reykjavik Energy, Iceland Project Office: GEORG, Iceland 18 Partners: Power companies, Universities and Research Institutes 9 Countries: France, Germany, Iceland, Italy, Norway, Spain, The Netherlands, Turkey, United Kingdom. Project duration: 4 years, 95 annual work units. Total Horizon 2020 funding 16 €M Funding for METU 825K €