Relevant bibliographies by topics / Organic working fluid

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Organic working fluid'

Author: Grafiati
Published: 2 June 2025
Last updated: 19 July 2025

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Journal articles on the topic "Organic working fluid"

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Vijayaraghavan, Sanjay, and D. Y. Goswami. "Organic Working Fluids for a Combined Power and Cooling Cycle." Journal of Energy Resources Technology 127, no. 2 (2005): 125–30. http://dx.doi.org/10.1115/1.1885039.

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A new thermodynamic cycle has been developed for the simultaneous production of power and cooling from low-temperature heat sources. The proposed cycle combines the Rankine and absorption refrigeration cycles, providing power and cooling as useful outputs. Initial studies were performed with an ammonia-water mixture as the working fluid in the cycle. This work extends the application of the cycle to working fluids consisting of organic fluid mixtures. Organic working fluids have been used successfully in geothermal power plants, as working fluids in Rankine cycles. An advantage of using organic working fluids is that the industry has experience with building turbines for these fluids. A commercially available optimization program has been used to maximize the thermodynamic performance of the cycle. The advantages and disadvantages of using organic fluid mixtures as opposed to an ammonia-water mixture are discussed. It is found that thermodynamic efficiencies achievable with organic fluid mixtures, under optimum conditions, are lower than those obtained with ammonia-water mixtures. Further, the refrigeration temperatures achievable using organic fluid mixtures are higher than those using ammonia-water mixtures.
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Zhu, Qidi, Zhiqiang Sun, and Jiemin Zhou. "Performance analysis of organic Rankine cycles using different working fluids." Thermal Science 19, no. 1 (2015): 179–91. http://dx.doi.org/10.2298/tsci120318014z.

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Low-grade heat from renewable or waste energy sources can be effectively recovered to generate power by an organic Rankine cycle (ORC) in which the working fluid has an important impact on its performance. The thermodynamic processes of ORCs using different types of organic fluids were analyzed in this paper. The relationships between the ORC?s performance parameters (including evaporation pressure, condensing pressure, outlet temperature of hot fluid, net power, thermal efficiency, exergy efficiency, total cycle irreversible loss, and total heat-recovery efficiency) and the critical temperatures of organic fluids were established based on the property of the hot fluid through the evaporator in a specific working condition, and then were verified at varied evaporation temperatures and inlet temperatures of the hot fluid. Here we find that the performance parameters vary monotonically with the critical temperatures of organic fluids. The values of the performance parameters of the ORC using wet fluids are distributed more dispersedly with the critical temperatures, compared with those of using dry/isentropic fluids. The inlet temperature of the hot fluid affects the relative distribution of the exergy efficiency, whereas the evaporation temperature only has an impact on the performance parameters using wet fluid.
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Tang, Jianping, Lixia Kang, and Yongzhong Liu. "An Effective Method for Working Fluid Design of Organic Rankine Cycle." Processes 10, no. 9 (2022): 1857. http://dx.doi.org/10.3390/pr10091857.

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This paper addresses an effective method for the selection and design of optimal working fluids of organic Rankine cycle (ORC) based on quantitative working fluid selection rules, aiming to reduce the complexity and improve the calculation efficiency of the working fluid design model. In the proposed method, the critical properties of the optimal working fluids for the given heat sources are first explored and summarized based on the quantitative relationship obtained by existing research and simulations. Based on the concept of working fluid substitution, the critical properties of the optimal pure working fluid are then adopted to target the optimal mixture working fluid by solving a modified computer-aided molecular-mixture design (CAMD) model and the ratio r of critical pressure to critical temperature is also strictly constrained to ensure a better working fluid. The component and the composition of the mixture working fluid are, thus, determined simultaneously. Results showed that both the designed pure and mixture working fluids have better performance than the existing ones determined by the selection and design rules. The targeted mixture working fluid enables one to achieve at least similar systematic efficiency and a better exergy efficiency in ORC than pure working fluid featuring similar critical properties. The application of the proposed method and model is finally verified via a practical case study.
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Wang, Yi, Jiawen Yang, Li Xia, Xiaoyan Sun, Shuguang Xiang, and Lili Wang. "Research on screening strategy of Organic Rankine Cycle working fluids based on quantum chemistry." Clean Energy Science and Technology 2, no. 2 (2024): 169. http://dx.doi.org/10.18686/cest.v2i2.169.

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The screening of working fluids is one of the key components in the study of power generation systems utilizing low-temperature waste heat. However, the variety of working fluids and their complex composition increase the difficulty of screening working fluids. In this study, a screening strategy for working fluids was developed from the perspective of the thermodynamic physical properties of working fluids. A comparative ideal gas heat capacity via the reduced ideal gas heat capacity factor (RCF) was proposed to characterize the dry and wet properties of working fluids, where RCF > 1 indicated a dry working fluid and RCF < 1 indicated a wet working fluid. A three-step screening strategy was developed for working fluid screening for organic Rankine cycles (ORCs). The strategy comprised basic physical property analysis of working fluids, research on dry and wet properties, and quantum chemical analysis. By comparing the RCF calculation result of 23 selected working fluid with values from the literature, the relative deviations of the data were less than 6.64% overall, indicating that the calculation result of the RCFs is reliable. The selection strategy explains the mechanism of working fluid selection in ORC systems from both micro- and macro-perspectives, laying a foundation for the study of structure-activity relationships in working fluids for ORCs.
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Megaprastio, Bayu, Ahmad Murtadlo Zaka, Rifda Salsabila Zahra, Nyayu Aisyah, and Hifni Mukhtar Ariyadi. "Design of the Organic Rankine Cycle (ORC) System Using R600 and R600a as Working Fluid." E3S Web of Conferences 448 (2023): 04004. http://dx.doi.org/10.1051/e3sconf/202344804004.

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Organic Rankine Cycle (ORC) is one of the alternative technologies for generating electricity from low to medium level heat sources. ORC operates at low temperatures and pressures using two types of organic working fluids. The organic working fluids as the refrigerants were chosen in the ORC system instead of water, which is suitable for high pressure and temperature applications. Since the performance and configuration of the ORC system rely on its working fluids, the selection of the working fluid for the ORC system becomes crucial. The system utilizes low-temperature heat sources as a supply of heat energy that flows through the evaporator and is then received by the working fluid to operate the cycle. In this study, two dry type working fluids, namely butane (R600) and isobutane (R600a), were used to thermally design an ORC to recover geothermal waste heat. The working fluids were designed using mathematical calculations based on thermodynamic laws. The results revealed that a slightly higher thermal efficiency value was achieved when using R600 as the working fluid, which was 12.8% compared to R600a.
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Matuszewska, Dominika, Marta Kuta, and Jan Górski. "A thermodynamic assessment of working fluids in ORC systems." EPJ Web of Conferences 213 (2019): 02057. http://dx.doi.org/10.1051/epjconf/201921302057.

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ORC (Organic Rankine Cycle) is widely used to convert low temperature heat into electricity using organic working fluid. The performance of an ORC installation is influenced deeply by selected working fluid and operation conditions. Recently has been presented a new generation of working fluids dedicated to ORC systems. They are characterized by near zero ODP (Ozone Depletion Potential) coefficient and significantly smaller GWP (Global Warming Potential) in comparison with currently used refrigerants. This paper presents preliminary research on selected dry and isentropic ORC fluids and some peculiarities in their behaviour.
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Kolasiński, Piotr. "The Method of the Working Fluid Selection for Organic Rankine Cycle (ORC) Systems Employing Volumetric Expanders." Energies 13, no. 3 (2020): 573. http://dx.doi.org/10.3390/en13030573.

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The working fluid selection is one of the most important issues faced when designing Organic Rankine Cycle (ORC) systems. The choice of working fluid is dictated by different criteria. The most important of them are safety of use, impact on the environment, and physical and chemical parameters. The type of ORC system in which the working fluid is to be used and the type of expander applied in this system is also affecting the working fluid selection. Nowadays, volumetric expanders are increasingly used in ORC systems. In the case of volumetric expanders, in addition to the aforementioned working fluid selection criteria, additional parameters are considered during the selecting of the working fluid, such as the range of operating pressures and geometric dimensions (determining the volume of working chambers) affecting the achieved power and efficiency of the expander. This article presents a method of selecting a working medium for ORC systems using volumetric expanders. This method is based on the dimensionless rating parameters applied for the comparative analysis of different working fluids. Dimensionless parameters were defined for selected thermal properties of the working fluids, namely thermal capacity, mean temperature of evaporation, mean temperature of condensation, pressure and volumetric expansion ratio, volumetric expandability, as well as the heat of preheating, vaporization, superheating, cooling, and liquefaction. Moreover, isentropic expansion work was considered as the rating parameter. In this article, in addition to the working fluid selection method, computational examples related to the selection of the working fluid for the ORC system fed by a heat source featuring specified temperatures are presented. The results of calculations of rating parameters and their comparison gave an outlook on the selection of appropriate working fluids.
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Zhao, Guo Chang, Li Ping Song, Xiao Chen Hou, and Yong Wang. "Thermodynamic Optimization of the Organic Rankine Cycle in a Concentrating Photovoltaic/Thermal Power Generation System." Applied Mechanics and Materials 448-453 (October 2013): 1514–18. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.1514.

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The selection criteria of working fluids for solar thermal organic Rankine cycle and the features of R245fa as a working fluid are analyzed. A thermodynamic analysis of photovoltaic / thermal organic Rankine cycle system and the influence of evaporation temperature of working fluid in the evaporator coupled with solar panels are conducted. The results show that the performance of the solar photovoltaic/thermal organic Rankine cycle can be improved by optimizing the evaporation temperature, and 130°C is an appropriate evaporation temperature.
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Zhang, Luoyu, Lili Wang, Xiaoyan Sun, et al. "Multi-Objective Evaluation Strategy Based on Data Envelopment Analysis for Working Fluid Selection in the Organic Rankine Cycle." Processes 13, no. 4 (2025): 1013. https://doi.org/10.3390/pr13041013.

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Currently, in Chinese industry substantial amounts of low-grade waste heat are underutilized. Effectively harnessing these low-temperature waste heat sources is instrumental in promoting energy conservation and emission reduction objectives. The organic Rankine cycle (ORC) serves as an effective method for utilizing low-grade waste heat. The selection of a suitable working fluid is a pivotal aspect of the design of an ORC system. There are many kinds of working fluid and they have complex molecular structures, which increases the difficulty of screening working fluids. A novel approach is proposed based on data envelopment analysis (DEA) for multi-objective evaluation of working fluids. This method takes into account the thermodynamic performance of the working fluid in the ORC (thermal efficiency, net power output, exergy efficiency), economic aspects (investment cost, exergy loss cost), and environmental considerations (exergy environmental factors, CO2 emission reduction). DEA offers a distinct advantage by objectively balancing these conflicting objectives through data-driven optimization, eliminating the need for subjective weight assignment and enabling simultaneous evaluation of thermodynamic, economic, and environmental metrics in working fluid selection. A total of 62 different working fluids were evaluated in the integrated technology. Heptane working fluid screened out by DEA was compared with working fluid R245fa, a fluid commonly used in existing literatures. The exergy loss of the Heptane working fluid is reduced by 5.02%, the thermal efficiency is increased by 0.24%, and the net output work is increased by 2.04%. The proposed evaluation method introduces a novel perspective for the efficient screening of working fluids in the ORC system for low-temperature waste heat power generation.
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Liu, Guanglin, Qingyang Wang, Jinliang Xu, and Zheng Miao. "Exergy Analysis of Two-Stage Organic Rankine Cycle Power Generation System." Entropy 23, no. 1 (2020): 43. http://dx.doi.org/10.3390/e23010043.

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Organic Rankine cycle (ORC) power generation is an effective way to convert medium and low temperature heat into high-grade electricity. In this paper, the subcritical saturated organic Rankine cycle system with a heat source temperature of 100~150 °C is studied with four different organic working fluids. The variations of the exergy efficiencies for the single-stage/two-stage systems, heaters, and condensers with the heat source temperature are analyzed. Based on the condition when the exergy efficiency is maximized for the two-stage system, the effects of the mass split ratio of the geothermal fluid flowing into the preheaters and the exergy efficiency of the heater are studied. The main conclusions include: The exergy efficiency of the two-stage system is affected by the evaporation temperatures of the organic working fluid in both the high temperature and low temperature cycles and has a maximum value. Under the same heat sink and heat source parameters, the exergy efficiency of the two-stage system is larger than that of the single-stage system. For example, when the heat source temperature is 130 °C, the exergy efficiency of the two-stage system is increased by 9.4% compared with the single-stage system. For the two-stage system, analysis of the four organic working fluids shows that R600a has the highest exergy efficiency, although R600a is only suitable for heat source temperature below 140 °C, while other working fluids can be used in systems with higher heat source temperatures. The mass split ratio of the fluid in the preheaters of the two-stage system depends on the working fluid and the heat source temperature. As the heat source temperature increases, the range of the split ratio becomes narrower, and the curves are in the shape of an isosceles triangle. Therefore, different working fluids are suitable for different heat source temperatures, and appropriate working fluid and split ratio should be determined based on the heat source parameters.
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Dissertations / Theses on the topic "Organic working fluid"

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Da, Silva Rui Pitanga Marques. "Organic fluid mixtures as working fluids for the trilateral flash cycle system." Thesis, City University London, 1989. http://openaccess.city.ac.uk/7945/.

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The requirements for power generation systems have been reviewed together with the various energy sources available for them. Geothermal energy has been examined in more detail and the principal methods of recovering power from it which are currently employed are discussed. A novel method for improved power recovery from geothermal sources called the Trilateral Flash Cycle (TFC) system is described which has the special requirement of an efficient two-phase expander. Optimum results are obtained from this cycle if a working fluid is used which leaves the expander as dry saturated vapour. A binary mixture of hydrocarbons was therefore sought which by variation of the constituent proportions, would satisfy this requirement for a range of inlet temperatures when the condensing temperature is constant. Methods of estimating mixture properties are reviewed and the chosen thermodynamic model, as well as a computational procedure for evaluation of vapour-liquid equilibria of organic binary mixtures at high pressures, are described. This is based on the Redlich-Kwong- Soave cubic equation of state. By this means a mixture of n-pentane and 2,2-dimethylpropane (neopentane) was found to be the most suitable for the TFC system for expander inlet temperatures between 150-180'C. Temperature-entropy (T-S) diagrams of this organic binary mixture were obtained for several compositions. Bubble and dew pressures of (n-pentane + 2,2-dimethylpropane) have been determined experimentally for five different compositions at six different temperatures, (333.15 K, 353.15 K, 373.15 K, 393.15 K, 413.15 K, and 433.15 K). Vapour pressures of pure n-pentane and pure neo-pentane were also determined at these temperatures. The critical point of neo-pentane was measured to assess the accuracy of the isothermal compression apparatus used. Theoretical predictions were found to be in good agreement with experimental measurements.
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Bamgbopa, Musbaudeen Oladiran. "Modeling And Performance Evaluation Of An Organic Rankine Cycle (orc) With R245fa As Working Fluid." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614367/index.pdf.

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This thesis presents numerical modelling and analysis of a solar Organic Rankine Cycle (ORC) for electricity generation. A regression based approach is used for the working fluid property calculations. Models of the unit&rsquo<br>s sub-components (pump, evaporator, expander and condenser) are also established. Steady and transient models are developed and analyzed because the unit is considered to work with stable (i.e. solar + boiler) or variable (i.e. solar only) heat input. The unit&rsquo<br>s heat exchangers (evaporator and condenser) have been identified as critical for the applicable method of analysis (steady or transient). The considered heat resource into the ORC is in the form of solar heated water, which varies between 80-95 0C at a range of mass flow rates between 2-12 kg/s. Simulation results of steady state operation using the developed model shows a maximum power output of around 40 kW. In the defined operation range<br>refrigerant mass flow rate, hot water mass flow rate and hot water temperature in the system are identified as critical parameters to optimize the power production and the cycle efficiency. The potential benefit of controlling these critical parameters is demonstrated for reliable ORC operation and optimum power production. It is also seen that simulation of the unit&rsquo<br>s dynamics using the transient model is imperative when variable heat input is involved, due to the fact that maximum energy recovery is the aim with any given level of heat input.
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Xu, Zhi Guo. "An investigation of two-phase flow of organic working fluids in the inlet port of a Lysholm screw expander." Thesis, City University London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294052.

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Mohamad, Salman. "EVALUATING THE ORGANIC RANKINE CYCLE (ORC) FOR HEAT TO POWER : Feasibility and parameter identification of the ORC cycle at different working fluid with district waste heat as a main source." Thesis, Mälardalens högskola, Framtidens energi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-38573.

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New technologies to converting heat into usable energy are constantly being developed for renewable use. This means that more interactions between different energy grid will be applied, such as utilizing low thermal waste heat to convert its energy to electricity. With high electricity price, such technology is quite attractive at applications that develop low waste heat. In the case of excess heat in district heating (DH) grid and the electricity price are high, the waste heat can be converted to electricity, which can bring a huge profit for DH companies. Candidate technologies are many and the focus in this degree rapport is on the so-called Organic Rankine Cycle (ORC) that belongs to the steam Rankine cycle. Instead of using water as a working fluid, organic working fluid is being used because of its ability to boil at lower temperature. Because this technique is available, it also needs to be optimized, developed, etc. to achieve the highest appropriate efficiency. This can be done, for example, by modeling different layouts, analyzing functionality, performance and / or do a simulation of various suitable working fluids.  This is the purpose of this degree project and the research parts are to select working fluids suitable at low temperatures (70-120) °C, the difference analysis between the selected fluids and identification of the parameters that most affect the performance. There are many suitable methods to apply to achieve desired results. The method used in this rapport degree is commercial software such as Mini REFPROP, CoolPack, Excel but the most important part is simulation with AspenPlus. The selected and suitable working fluids between the chosen temperature interval are R236ea, R600, R245fa and n-hexane. Three common layouts were investigated, and they are The Basic ORC, ORC with an internal heat exchanger (IHE) and regenerative ORC. The results show that in comparison between 120°C and 70°C as a temperature source and without an internal heat exchanger (IHE), R600 at 70°C, has the highest efficiency about 13.55%. At 110°C n-hexane has the highest efficiency about 18.10%. R236ea has the lowest efficiency 13.16% at 70°C and 16.29% at 110°C. R236ea kept its low efficiency through all results. Without an IHE and a source range from 70 °C up to almost 90 °C, R600 has the highest efficiency and at 90°C n-hexane has the highest efficiency. With an IHE and between (70-90) °C R245fa still has the highest efficiency. With or without IHE and a heat source of 110 °C n-hexane has the highest efficiency 18.10% and 18.40%. R236ea gets the greatest increase 5.2% in efficiency but remains with the lowest efficiency. With Regenerative ORC, n-hexane had an optimal middle pressure about 0.76 bar. The optimal pressure corresponds to a thermal efficiency of 17.52%. The most important identified parameters are the fluid characteristics such as higher critical temperature, temperature source, heat sink, application placement and component performance.         The current simulations have been run at some fixed data input such as isentropic efficiencies, no pressure drops, adiabatic conditions etc. It was therefore expected that the same efficiency curve would repeat itself. This efficiency pattern would differ with less or higher values depending on the layout performance. However, this pattern was up to 90 degrees Celsius and gets a very noticeable change by the change of the efficiency for n-hexane. Therefore n-hexane is chosen with Regenerative ORC because it had the highest efficiency at the highest temperature source tested. This is due definitive to the fluid properties like its high critical temperature compared to the other selected fluids. R236ea remains the worst and that’s also related to the fluid properties. It is also important to note that these efficiencies are only from a thermodynamic perspective and may differ when combining both thermal and economic perspectives as well as application placement. These high efficiencies will certainly be lower at more advanced or real processes due to various factors that affect performance. Factors such as component´s efficiency and selection, pipe type and size, etc. To maintain a constant temperature when it’s not, flow regulation is then necessary and that’s also affects the performance.   The conclusion is that the basic ORC which does not have an IHE and from 70 up to 90 degrees Celsius, R600 has the highest efficiency. Higher temperature gives n-hexane the highest efficiency. With an IHE and between (70-90) °C R254fa has the highest efficiency. At higher temperature source n-hexane has the highest efficiency. ORC with an IHE has the best performance. The R236ea has the worst performance through all results. With regenerative ORC, an optimal meddle-pressure for n-hexane is 0.76 bar. Important parameters are The properties of the fluid, temperature source, heatsink, Application placement and component performance.<br>Nej
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Amat, Albuixech Marta. "Búsqueda de fluidos de trabajo alternativos de bajo potencial calentamiento atmosférico para uso en Ciclos Orgánico Rankine de baja temperatura y pequeña potencia. Análisis de HCFO-1224yd(Z) como potencial candidato." Doctoral thesis, Universitat Jaume I, 2022. http://dx.doi.org/10.6035/14107.2022.427784.

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Esta tesis se centra en encontrar un fluido de bajo potencial calentamiento atmosférico (PCA) capaz de trabajar en instalaciones ORC de pequeña escala y baja temperatura previamente diseñadas para el uso de HFC-245fa. Para ello, además de revisar el estado en el que se encuentra esta tecnología, se realiza un estudio teórico y experimental. El estudio teórico compara el comportamiento del HFC-245fa con el de sus principales alternativas de bajo PCA: HCFO-1224yd(Z), HFO-1336mzz(Z), HCFO-1233zd(E), HFO-1234ze(Z), HFO-1336mzz(E) y R-514-A. Debido a sus similares resultados en cuanto a potencia y eficiencias y a su similar tamaño de expansor, el HCFO-1224yd(Z) destaca como principal candidato. Por ello, el HCFO-1224yd(Z) se prueba experimentalmente en dos instalaciones diferentes. Se obtienen unos resultados muy similares en cuanto a eficiencia neta pero una potencia neta menor a la del fluido de referencia, no obstante, ésta sería susceptible de mejora mediante pequeñas modificaciones en el ciclo.<br>The present thesis proposes finding a low global warming potential fluid suitable to work in small-scale, low-temperature organic Rankine cicles, previously designed for using HFC-245fa. The theoretical study shows how HCFO-1224yd(Z) stands out as the main candidate to substitute the HFC-245fa, due to its similar results in terms of power, efficiencies, and volumetric flow at the expander inlet. The experimental analysis proves the suitability of using HCFO-1224yd(Z) as a direct replacement. Besides offering a net power lower compare with the reference fluid, it offers very similar results in terms of net efficiency. For certain operating points, when the temperature of the heat source is high, the HCFO-1224yd(Z) offers higher net efficiency. In addition, the results obtained could be even improve with small cycle modifications.<br>Programa de Doctorat en Tecnologies Industrials i Materials
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Nouman, Jamal. "Comparative studies and analyses of working fluids for Organic Rankine Cycles - ORC." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102534.

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Khadra, Rami. "Nouvelle génération de transformateurs de chaleur, sélection de fluides de travail et optimisation des équipements du cycle en employant des technologies innovantes." Thesis, Paris, ENMP, 2015. http://www.theses.fr/2015ENMP0083.

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Ce travail contribue aux efforts de l'Union Européenne pour réduire les émissions de CO2. Son objectif est d'aider les industries produisant de la chaleur fatale à récupérer cette énergie perdue, d'augmenter sa température et de la réutiliser in situ. Les transformateurs de chaleur (Absorption Heat Transformers ou AHT), machines à absorption consommant très peu d'électricité, sont alors ici étudiés. Les AHTs existants rencontrent des problèmes comme la corrosion, la cristallisation, la toxicité et les niveaux de pression éloignés de la pression atmosphérique. Ceux-ci sont causés par les fluides conventionnels (Eau/LiBr et Ammoniaque/Eau) et s'aggravent à des températures supérieures à 120°C. Des modèles de conception ainsi que des solutions techniques, applicables avec tous mélanges de fluides organiques, sont alors proposés dans cette thèse. Ces modèles sont validés avec des données de la littérature et implémentés dans des outils d'aide à la décision.Tout d'abord, un modèle de sélection de paires de fluides organiques (parmi une liste de fluides) est développé. Les contraintes prises en compte sont, entre autres, les types et les profils de températures des sources et puits de chaleur, et les propriétés du fluide. Pour chaque type de fluide, la méthode la plus adaptée au calcul des propriétés physiques des fluides est choisie.En second lieu, pour effectuer la séparation des 2 constituants du mélange de fluides organiques, le générateur (composant recevant la chaleur fatale) et le condenseur de l'AHT sont fusionnés pour former une colonne de distillation. Un modèle d'une colonne de distillation nommée « hybride » est alors développé en adaptant la méthode de Ponchon-Savarit et en la combinant avec la méthode ETD (Equal Thermodynamic Distance). Cette colonne associe les avantages des 2 types de colonnes adiabatiques et diabatiques. Elle allie réduction de production d'entropie et meilleure exploitation des sources de chaleur à températures glissantes. La conception mécanique de la colonne hybride est aussi incluse.Troisièmement, pour atteindre la température théorique maximale du mélange de fluide déjà choisi, l'absorbeur de l'AHT (où la chaleur à haute température est libérée) est divisé en sections adiabatiques suivies par des sections diabatiques. De plus, les modèles détaillés des colonnes à bulles (fonctionnant en co-courant ou en contre-courant) ainsi que de la colonne à garnissage sont présentés et comparés entre eux.Les principaux résultats de ces travaux consistent en une nouvelle méthodologie de choix de fluides organiques pouvant remplacer les mélanges classiques surtout à températures élevées (supérieures à 130 °C). En ce qui concerne la colonne de distillation, il est montré que la colonne adiabatique constitue un meilleur choix lorsqu'une source de chaleur latente est disponible tandis qu'avec une source de chaleur sensible, la colonne hybride engendre moins de pertes exergétiques. En passant à l'absorbeur, le nouveau mode d'opération de celui-ci permet à l'utilisateur d'atteindre des températures plus élevées que celles réalisées avec les technologies actuellement disponibles. Enfin, les modèles développés permettent de choisir les technologies de distillation (adiabatique, diabatique ou hybride) et d'absorption (colonne à bulles ou à garnissage) les plus appropriées en s'adaptant à différentes problématiques industrielles<br>This work is part of the European union efforts to reduce its CO2 emissions. It aims to assist any waste heat producing industry in recuperating this lost thermal energy, pumping it to higher temperature levels and reusing it on site. Absorption Heat Transformers (AHT), that consume little electricity, are used for this task. Current AHT problems such as corrosion, crystallization, toxicity and inconvenient pressure levels are caused by conventionally used H2O/LiBr and NH3/ H2O working fluids and get worse at temperatures exceeding 120°C. Potential solutions are thus suggested. According to them, models are developed; they are all able to operate with any organic mixture and are customized to accompany the industrialist from start to finish. These solutions were validated by comparing them with literature data and are implemented into several tools.Firstly, a model selects the optimal organic binary mixture -among a list of fluids- in terms of the real case application's constraints: Heat transfer fluids used, Heat source's and heat sink's types and temperature profiles, mixtures transport properties among other parameters. Suitable thermodynamic model is selected for different fluid group types.Secondly, in order to separate the 2 components of the chosen mixture of organic compounds, the AHT generator (component which receives waste heat) is merged with the AHT condenser thus forming a distillation column. A “hybrid column” is designed by modifying the Ponchon-Savarit method and combining it with the Equal Thermodynamic Distance (ETD) method. This new column associates the best features of the two columns. It reduces entropy production rates and best exploits temperature gliding heat sources. Mechanical design for the hybrid column is also included.Thirdly, to ensure that the maximum theoretical temperature of the working fluid is reached, the AHT absorber (where high temperature heat is released) is divided into consecutive adiabatic parts followed by diabatic ones. Detailed Models for co-current and counter-current bubble columns as well as packing columns are presented and compared.Main results consist in a selection methodology of organic compounds mixtures, capable of replacing conventional ones specially at temperatures higher than 130 °C. It's also shown that adiabatic columns are better options when latent type heat sources are available while hybrid columns lose less exergy when used with sensible heat sources. As for the absorber, the new operating mode provides the user with higher temperatures than currently reached by available technologies. Finally, using the developed models, tailored and most suitable distillation (adiabatic, diabatic or hybrid columns) and absorber (bubble or packing columns) technologies can be proposed depending on the industrial specific cases and requirements
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Lampe, Matthias Verfasser], André [Akademischer Betreuer] [Bardow, and Joachim [Akademischer Betreuer] Gross. "Integrated design of process and working fluids for organic rankine cycles / Matthias Lampe ; André Bardow, Joachim Gross." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1126971677/34.

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Eyerer, Sebastian [Verfasser]. "Contribution to Improve the Organic Rankine Cycle: Experimental Analysis of Working Fluids and Plant Architectures / Sebastian Eyerer." München : Verlag Dr. Hut, 2021. http://nbn-resolving.de/urn:nbn:de:101:1-2021100123320721813906.

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Lampe, Matthias [Verfasser], André [Akademischer Betreuer] Bardow, and Joachim [Akademischer Betreuer] Gross. "Integrated design of process and working fluids for organic rankine cycles / Matthias Lampe ; André Bardow, Joachim Gross." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://nbn-resolving.de/urn:nbn:de:hbz:82-rwth-2016-027963.

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Books on the topic "Organic working fluid"

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Working Fluid Selection for Organic Rankine Cycle and Other Related Cycles. MDPI, 2020. http://dx.doi.org/10.3390/books978-3-03936-075-8.

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Smith, Martin, Giuseppe Citerio, W. Andrew Kofke, and Geert Meyfroidt. Oxford Textbook of Neurocritical Care. 2nd ed. Oxford University PressOxford, 2025. https://doi.org/10.1093/med/9780198864714.001.0001.

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Abstract Neurocritical care is a multidisciplinary specialty that provides comprehensive management for life-threatening disorders of the central nervous system and their complications. The second edition of the Oxford Textbook of Neurocritical Care brings together international experts from many disciplines to provide an overview of all aspects of neurocritical care. In 33 updated or new chapters, this textbook covers the pathophysiology of acute neurological conditions, including acute brain injury, advancements in neuromonitoring and neuroimaging techniques, evidenced-based treatment strategies, prognostication, and patient outcomes. Each chapter highlights the latest advances in specific areas and emphasizes the importance of the attention to detail that underpins neurocritical care. In the first two sections, the textbook addresses relevant physiology and pathophysiology, general management issues such as cardiorespiratory support, fluid management, sedation and analgesia, and nutrition, and all aspects of neuromonitoring. The third section deals with specific conditions including traumatic brain injury, haemorrhagic and ischaemic stroke, spinal cord injury, postoperative management, neuromuscular disorders, infection and inflammation, status epilepticus, postcardiac arrest syndrome, and disorders of consciousness. The comprehensive coverage of this book is completed by chapters on topics such as non-neurological complications and electrolyte and endocrine disturbances after acute brain injury, neurocritical care in resource-poor environments, paediatric neurocritical care, brain death, organ donation, and ethical issues. Although primarily aimed at those working in neurocritical care, the Oxford Textbook of Neurocritical Care will also be of interest to those from other disciplines who have regular or occasional contact with patients with acute neurological disorders.
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Book chapters on the topic "Organic working fluid"

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Angelino, G., C. Invernizzi, and E. Macchi. "Organic Working Fluid Optimization for Space Power Cycles." In Modern Research Topics in Aerospace Propulsion. Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4612-0945-4_16.

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Saoud, Abdelmajid, Yasmina Boukhchana, and Ali Fellah. "Performance Investigation and Working Fluid Evaluation for Organic Rankine Cycle Power Plant." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions (4th Edition). Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-51904-8_44.

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Hui-tao, Wang, Wang Hua, and Ge Zhong. "Optimal Selection of Working Fluid for the Organic Rankine Cycle Driven by Low-Temperature Geothermal Heat." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-26007-0_17.

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Aboaltabooq, Mahdi Hatf Kadhum, Horatiu Pop, Viorel Bădescu, Valentin Apostol, Cristian Petcu, and Mălina Prisecaru. "Working Fluids for Organic Rankine Cycles Comparative Studies." In Springer Proceedings in Energy. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09707-7_22.

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Aguilar-Hipólito, L. P., L. Morales-Salas, D. Colorado-Garrido, and J. V. Herrera-Romero. "Evaluation of the Solar Organic Rankine Cycle with Different Working Fluids." In Congress on Research, Development, and Innovation in Renewable Energies. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-26813-7_9.

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Oralli, Emre, and Ibrahim Dincer. "Thermoeconomic Optimization of Scroll-Based Organic Rankine Cycles with Various Working Fluids." In Progress in Exergy, Energy, and the Environment. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04681-5_18.

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Dhalait, Rustum, Suhas Jagtap, and Bajirao Gawali. "Selection of Optimum Working Fluids for Low-Power Output Organic Rankine Cycle." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8025-3_9.

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Kizilkan, Önder, Sandro Nižetić, and Gamze Yildirim. "Solar Assisted Organic Rankine Cycle for Power Generation: A Comparative Analysis for Natural Working Fluids." In Energy, Transportation and Global Warming. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30127-3_15.

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Biswas, Ayona, and Bijan Kumar Mandal. "Analysis of Organic Rankine Cycle Using Various Working Fluids for Low-Grade Waste Heat Recovery." In Green Energy and Technology. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2279-6_37.

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Othman, Nursyuhadah, and Faiza Mohamed Nasir. "The Effect of Different Working Fluids on the Thermal and Economic Performance of Organic Rankine Cycles for Heat Recovery from Industrial Kiln." In Advanced Structured Materials. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-81517-1_11.

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Conference papers on the topic "Organic working fluid"

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Zhou, Qixin, Yechun Wang, and Gordon P. Bierwagen. "Flow-Accelerated Coating Degradation: Influence of the Composition of Working Fluids." In CORROSION 2012. NACE International, 2012. https://doi.org/10.5006/c2012-01656.

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Abstract Water percolation into the metal-coating interface is usually the main cause of the loss of barrier properties of coatings and leads to coating delamination and under-film corrosion. Recently, flowing fluid accelerated coating degradation has been received more attention since flowing liquids may enhance the transport of ions, oxygen, and water through the coating film, abrade the coating surface with fluids shear, and degrade the barrier properties of organic coatings. In this study, both deionized water and 3.5 wt% sodium chloride solution are chosen as the working fluids. The organic coatings are exposed to stationary immersion as well as the laminar flow with a variety of flow rates. The barrier properties of coatings are monitored inline by electrochemical impedance spectroscopy (EIS) measurements. Equivalent circuit models are developed to interpret EIS spectra and to analyze the physical behavior of coatings decrease with the immersion time and the decrease is more substantial for flowing fluids at higher flow rates disregard of the composition of the working fluid.
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Wang, D. Y., G. Pei, J. Li, Y. Z. Li, and J. Ji. "Analysis of working fluid for Organic Rankine Cycle." In Environment (ICMREE). IEEE, 2011. http://dx.doi.org/10.1109/icmree.2011.5930775.

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Minor, Barbara, Konstantinos (Kostas) Kontomaris, and Bianca Hydutsky. "Nonflammable Low GWP Working Fluid for Organic Rankine Cycles." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26855.

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Regulatory pressure has been increasing globally to address the issue of climate change. In particular, there are plans to reduce the use of hydrofluorocarbon (HFC) based working fluids across many applications, as HFCs are forecast to be significant contributors to global warming in the future. Therefore, there is a need to find low global warming potential (GWP) fluids suitable for organic rankine cycles (ORCs) in those systems where HFCs have historically been preferred. These are usually systems that require a non-flammable working fluid. A new ORC working fluid, cis-1,1,1,4,4,4-hexafluoro-2-butene, also called DR-2 (cis-CF3CH=CHCF3) has been developed which is nonflammable with very low GWP of 8.9 and an ozone depletion potential (ODP) of zero because it contains no chlorine or other halogen atoms other than fluorine. DR-2 also has a favorable toxicity profile based on testing to date. DR-2 is thermally stable in the presence of lubricant and metals, air and oxygen up to the maximum temperature tested of 250°C. DR-2 has a boiling point of 33.4°C and a relatively high critical temperature of 171.3°C, which result in relatively low vapor pressures and high cycle energy efficiencies. It can enable more environmentally sustainable ORC platforms to generate electrical power from widely available heat at higher temperatures and with higher energy efficiencies than incumbent working fluids.
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Vijayaraghavan, Sanjay, and D. Y. Goswami. "Organic Working Fluids for a Combined Power and Cooling Cycle." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43184.

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A new thermodynamic cycle has been developed for the simultaneous production of power and cooling from low temperature heat sources. The proposed cycle combines the Rankine and absorption refrigeration cycles, providing power and cooling as useful outputs. Initial studies were performed with an ammonia-water mixture as the working fluid in the cycle. This work extends the application of the cycle to working fluids consisting of organic fluid mixtures. Organic working fluids have been used successfully in geothermal power plants, as working fluids in Rankine cycles. An advantage of using organic working fluids is that the industry has experience with building turbines for these fluids. A commercially available optimization program has been used to maximize the thermodynamic performance of the cycle. The advantages and disadvantages of using organic fluid mixtures as opposed to an ammonia-water mixture are discussed. It is found that thermodynamic efficiencies achievable with organic fluid mixtures, under optimum conditions, are lower than those obtained with ammonia-water mixtures. Further, the refrigeration temperatures achievable using organic fluid mixtures are higher than those using ammonia-water mixtures.
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Reinker, Felix, Robert Wagner, Karsten Hasselmann, et al. "Testing, modeling and simulation of fans working with organic vapors." In European Conference on Turbomachinery Fluid Dynamics and Thermodynamics. European Turbomachinery Society, 2019. http://dx.doi.org/10.29008/etc2019-195.

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Husin, Nur Syafiqah, Chin Wai Lim, Kaiding Ng, et al. "Brief review of working fluid selection for organic rankine cycle." In THE 11TH INTERNATIONAL CONFERENCE ON THEORETICAL AND APPLIED PHYSICS: The Spirit of Research and Collaboration Facing the COVID-19 Pandemic. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0138444.

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Bandean, D. C., S. Smolen, and J. T. Cieslinski. "Working Fluid Selection for Organic Rankine Cycle Applied to Heat Recovery Systems." In World Renewable Energy Congress – Sweden, 8–13 May, 2011, Linköping, Sweden. Linköping University Electronic Press, 2011. http://dx.doi.org/10.3384/ecp11057772.

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Fu, Hongxiang, Ettore Zanetti, Jianjun Hu, David Blum, and Michael Wetter. "A Modelica Implementation of an Organic Rankine Cycle." In American Modelica Conference 2024. Linköping University Electronic Press, 2025. https://doi.org/10.3384/ecp207127.

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Organic Rankine cycle (ORC) systems generate power from low-grade heat sources, such as geothermal sources and industrial waste heat. A key feature is that a working fluid is selected to match the temperature of the source. With the vast pool of candidate working fluids comes the challenge of developing a large number of robust thermodynamic media models. We implemented a subcritical ORC model in Modelica that uses working fluid data records and interpolation schemes in lieu of thermodynamic medium evaluation for energy recovery estimation. This is a component model that can be integrated into a larger energy system model. It does not require detailed thermodynamic, heat transfer, or machine analysis. Our ORC model fills a gap where working fluids are ready to choose or easy to add, and at the same time can be integrated into an energy system.
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Mondejar, Maria E., Marcus Thern, and Magnus Genrup. "Aerodynamic Considerations in the Thermodynamic Analysis of Organic Rankine Cycles." In ASME 2014 Power Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/power2014-32174.

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Due to the increasing interest of producing power from renewable and non-conventional resources, organic Rankine cycles are finding their place in today’s thermal energy mix. The main influencers on the efficiency of an organic Rankine cycle are the working fluid and the expander. Therefore most of the research done up to date turns around the selection of the best performance working media and the optimization of the expansion unit design. However, few studies consider the interaction of the working fluids in the turbine design, and how this fact can affect the overall thermodynamic cycle analysis. In this work we aim at including the aerodynamic behavior of the working fluids and their effect on the turbine efficiency in the thermodynamic analysis of an organic Rankine cycle. To that end, we proposed a method for the estimation of the characteristics of an axial in-flow turbine in an organic Rankine cycle simulation model. The code developed for the characterization of the turbine behavior under the working fluid properties evaluated the irreversibilities associated to the aerodynamic losses in the turbine. The organic Rankine cycle was analyzed by using IPSEpro process simulator. A set of candidate working fluids composed of selected organofluorines and organochlorines was chosen for the analysis. The thermophysical properties of the fluids were estimated with the equations of state implemented in Refprop. Results on the energy and exergy overall performances of the cycle were analyzed for a case study with standard source and sink temperatures. For each fluid the number of stages and geometry of the turbine were optimized. It was observed that some working fluids that could initially be considered as advantageous from a thermodynamic point of view, had an unfavorable impact on the turbine efficiency, thus increasing the irreversibilities of the cycle. We concluded that if the influence of the working fluid on the turbine performance is underestimated, the real performance of the organic Rankine cycle could show unexpected deviations from the theoretical results.
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Ali, Muhammad Ansab, Tariq Saeed Khan, Ebrahim Al Hajri, and Zahid H. Ayub. "A Computer Program for Working Fluid Selection of Low Temperature Organic Rankine Cycle." In ASME 2015 Power Conference collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/power2015-49691.

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Fossil fuels are continuously depleting while the global energy demand is growing at a fast rate. Additionally, fossil fuels based power plants contribute to environmental pollution. Search for alternate energy resources and use of industrial waste heat for power production are attractive topics of interest these days. One way of enhancing power production and decreasing the environmental impact is by recuperating and utilizing low grade thermal energy. In recent years, research on use of organic Rankine cycle (ORC) has gained popularity as a promising technology for conversion of heat into useful work or electricity. Due to simple structure of ORC system, it can be easily integrated with any energy source like geothermal energy, solar energy and waste heat. A computer program has been developed in engineering equation solver (EES) environment that analyzes and selects appropriate working fluid for organic Rankine cycle design based on available heat sources. For a given heat source, the program compares energy and exergy performance of various working fluids. The program also includes recuperator performance analysis and compares its effectiveness on the overall thermal performance of the Rankine cycle. This program can assist in preliminary design of ORC with respect to best performing refrigerant fluid selection for the given low temperature heat source.
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Reports on the topic "Organic working fluid"

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Cole, R. L., J. C. Demirgian, and J. W. Allen. Organic Rankine-cycle power systems working fluids study: Topical report No. 2, Toluene. Office of Scientific and Technical Information (OSTI), 1987. http://dx.doi.org/10.2172/5059264.

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Cole, R. L., J. C. Demirgian, and J. W. Allen. Organic Rankine-Cycle Power Systems Working Fluids Study: Topical report No. 3, 2-methylpyridine/water. Office of Scientific and Technical Information (OSTI), 1987. http://dx.doi.org/10.2172/7158660.

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3

Jain, M. L., J. C. Demirgian, and R. L. Cole. Organic Rankine-cycle power systems working fluids study: Topical report No. 1: Fluorinol 85. [85 mole % trofluoroethanol in water]. Office of Scientific and Technical Information (OSTI), 1986. http://dx.doi.org/10.2172/6034570.

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