Binary ORC (organic Rankine cycles) power plants for the exploitation of medium–low temperature geothermal sources – Part A: Thermodynamic optimization

Astolfi, Marco; Romano, Matteo Carmelo; Bombarda, P.; Macchi, Ennio

doi:10.1016/j.energy.2013.11.056

Cited by 138 publications

(68 citation statements)

References 24 publications

(12 reference statements)

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“…In fact, several papers are available in literature presenting different combinations of solar [18] and/or geothermal [19,20] systems coupled with ORC power plants. As an example, Franco and Villani [21] analyzed the exploitation of water-dominated geothermal fields at low temperature, showing brine specific consumptions, ranging from 20 to 120 kg s −1 for each net MW produced.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Simulation and Exergo-Economic Optimization of a Hybrid Solar–Geothermal Cogeneration Plant

2015

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This paper presents a dynamic simulation model and a parametric analysis of a solar-geothermal hybrid cogeneration plant based on an Organic Rankine Cycle (ORC) powered by a medium-enthalpy geothermal resource and a Parabolic Trough Collector solar field. The fluid temperature supplying heat to the ORC varies continuously as a function of the solar irradiation, affecting both the electrical and thermal energies produced by the system. Thus, a dynamic simulation was performed. The ORC model, developed in Engineering Equation Solver, is based on zero-dimensional energy and mass balances and includes specific algorithms to evaluate the off-design system performance. The overall simulation model of the solar-geothermal cogenerative plant was implemented in the TRNSYS environment. Here, the ORC model is imported, whereas the models of the other components of the system are developed on the basis of literature data. Results are analyzed on different time bases presenting energetic, economic and exergetic performance data. Finally, a rigorous optimization has been performed to determine the set of system design/control parameters minimizing simple payback period and exergy destruction rate. The system is profitable when a significant amount of the heat produced is consumed. The highest irreversibilities are due to the solar field and to the heat exchangers. OPEN ACCESSEnergies 2015, 8 2607

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Section: Introductionmentioning

confidence: 99%

Dynamic Simulation and Exergo-Economic Optimization of a Hybrid Solar–Geothermal Cogeneration Plant

2015

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“…Several applications can be found in the fields of geothermal power, solar power, biomass exploitation and low grade heat recovery [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Titanium tetrachloride as novel working fluid for high temperature Rankine Cycles: Thermodynamic analysis and experimental assessment of the thermal stability

Invernizzi

Iora

Bonalumi

et al. 2016

Applied Thermal Engineering

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h i g h l i g h t sTitanium tetrachloride is proposed as new fluid in high temperature Rankine cycles. We show experimentally that it is remarkably stable at temperatures up to 500°C. Resulting plant efficiencies of 35-40% are higher than state-of-the-art ORCs. Its high reactivity with water poses some concerns in the design of a power plant. a r t i c l e i n f o b s t r a c tIn this paper, Titanium tetrachloride (TiCl 4 ) is analyzed/assessed and proposed as a new potential working fluid in Rankine Cycles. Besides its good thermodynamic properties, TiCl 4 is in fact a fairly low cost, non-carcinogenic fluid, with zero Global Warming Potential (GWP) and Ozone Depleting Potential (ODP) and it is currently employed in high temperature industrial processes. It is however very reactive with humid air and water. A preliminary thermodynamic analysis confirms its possible application in power plants with maximum temperature up to 500°C, considerably higher than the ORC state-of-the-art technology, performing electrical efficiencies as high as 35-40%. This suggests the potential use of TiCl 4 as an alternative fluid in ORCs allowing the exploitation of high temperature sources (up to 500°C), typically used in steam cycles. To assess the possibility of operating the cycle in such high temperature conditions, we carried out an experimental thermal stress analysis, showing that the fluid is remarkably stable at temperatures up to 500°C, even in presence of P91 and Cupronickel, two materials typically employed in the high temperature section of power cycles.

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“…They are compared to the regenerative pre-heating design with state of the art cycles. Astolfi et al [21] investigated thermodynamic analysis and optimization of different ORC cycle types such as subcritical and trans-critical. Maraver et al [22] evaluated the thermodynamic optimization of organic Rankine cycle for power generation.…”

Section: Introductionmentioning

confidence: 99%

Comparative Thermodynamic Assessment of Various Super- and Trans-Critical Working Fluids for Low Temperature Power Generation Applications

Özcan¹,

Seyitoğlu²

2017

Journal of Polytechnic

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Bu makaleye şu şekilde atıfta bulunabilirsiniz (To cite to this article): Ozcan H. and Seyıtoglu S. S., "Comparative thermodynamic assessment of various super-and trans-critical working fluids for low temperature power generation applications", Politeknik Dergisi, 20(4): 915-921, (2017). Politeknik Dergisi, 2017; 20 (4) : 915-921 Journal of Polytechnic, 2017; 20 (4) ABSTRACTRecently, energy need is exponentially increasing in the world while energy sources are decreasing rapidly. Therefore, this issue requires energy sources to be used more efficiently and urges professionals to utilize energy from low temperature energy sources such as waste heat and low temperature renewable sources. In this study, energy and exergy analyses of several clean working fluids are comparatively studied in several organic Rankine cycle configurations. CO2, N2O, and SF6 fluids are compared with the conventional R23 in three ORC configurations, namely the basic ORC cycle, regenerative ORC cycle, and reheat and regenerative ORC cycle, respectively. Effects of various selected system and environmental parameters on the system performances are comprehensively investigated. Even though R23 shows the best energy and exergy performances than those of other investigated working fluids at low-temperature applications, N2O and CO2 provide a clean solution to high GWP (global warming potential) R23 with similar performance characteristics at low and high temperature power generation applications.Keywords: Organic rankine cycle, energy, exergy, R23, CO2, N2O, SF6. ÖZSon zamanlarda, enerji ihtiyacı dünyada katlanarak artarken enerji kaynakları hızla azalmaktadır. Bu yüzden, bu konu enerji kaynaklarının daha verimli kullanılması ve uzmanları atık ısı ve düşük sıcaklık yenilenebilir enerji kaynakları gibi düşük sıcaklık kaynaklarının kullanmalarını gerektirir. Bu çalışmada, birbirinden farklı temiz akışkanların enerji ve ekserji analizleri farklı organik Rankine çevrim konfigürasyonlarında karşılaştırmalı olarak incelenmiştir. CO2, N2O ve SF6 akışkanları geleneksel R23 akışkanı ile sırasıyla temel organik Rankine çevirimi, ara buhar almalı organik Rankine çevrimi ve ara ısıtmalı-ara buhar almalı organik Rankine çevrimlerinde karşılaştırılmıştır. Çeşitli seçilmiş sistemlerin ve çevresel parametrelerin sistem performanslarına etkileri kapsamlı olarak incelenmiştir.Anahtar Kelimeler: Organik rankine çevrimi, enerji, ekserji, R23, CO2, N2O, SF6.

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Binary ORC (organic Rankine cycles) power plants for the exploitation of medium–low temperature geothermal sources – Part A: Thermodynamic optimization

Cited by 138 publications

References 24 publications

Dynamic Simulation and Exergo-Economic Optimization of a Hybrid Solar–Geothermal Cogeneration Plant

Dynamic Simulation and Exergo-Economic Optimization of a Hybrid Solar–Geothermal Cogeneration Plant

Titanium tetrachloride as novel working fluid for high temperature Rankine Cycles: Thermodynamic analysis and experimental assessment of the thermal stability

Comparative Thermodynamic Assessment of Various Super- and Trans-Critical Working Fluids for Low Temperature Power Generation Applications

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