Thermodynamic and economic optimizations of a waste heat to power plant driven by a subcritical ORC (Organic Rankine Cycle) using pure or zeotropic working fluid

Le, Van Long; Kheiri, Abdelhamid; Feidt, Michel; Pelloux-Prayer, Sandrine

doi:10.1016/j.energy.2014.10.051

Cited by 204 publications

(53 citation statements)

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“…Recent studies considered thermo-economic aspects in the performance evaluation of ORC systems [6][7][8][9][10][11][12][13][14][15]. Heberle and Brüggemann [6] carried out a thermodynamic optimization of zeotropic mixtures and pure fluids followed by an economic post-processing of the most promising mixtures and their pure fluids for heat source temperatures at 120 • C and 160 • C. The results indicated that the specific investment costs were higher for the mixtures.…”

Section: Introductionmentioning

confidence: 99%

“…For the 160 • C case, propane/isobutane and R227ea/R245fa obtained a 4.0 % and 10.0 % reduction in the electricity generation cost compared to the best pure fluids in the mixtures. Le et al [7] maximized the exergy efficiency and minimized the levelized cost of electricity for ORC systems using mixtures of R245fa and pentane as working fluids. Pure pentane was identified as the best fluid in both optimizations.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids

et al. 2016

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For zeotropic mixtures, the temperature varies during phase change, which is opposed to the isothermal phase change of pure fluids. The use of such mixtures as working fluids in organic Rankine cycle power plants enables a minimization of the mean temperature difference of the heat exchangers, which is beneficial for cycle performance. On the other hand, larger heat transfer surface areas are typically required for evaporation and condensation when zeotropic mixtures are used as working fluids. In order to assess the feasibility of using zeotropic mixtures, it is, therefore, important to consider the additional costs of the heat exchangers. In this study, we aim at evaluating the economic feasibility of zeotropic mixtures compared to pure fluids. We carry out a multi-objective optimization of the net power output and the component costs for organic Rankine cycle power plants using low-temperature heat at 90 • C to produce electrical power at around 500 kW. The primary outcomes of the study are Pareto fronts, illustrating the power/cost relations for R32, R134a and R32/R134a (0.65/0.35 mole ). The results indicate that R32/R134a is the best of these fluids, with 3.4 % higher net power than R32 at the same total cost of 1200 k$.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids

et al. 2016

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“…cost (approximately 40 %) due to the turbine-generator unit [39]. As a result, in exhaust heat recovery applications,…”

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confidence: 99%

“…Note that due to a lower performance potential and thermal stability concern, blends with significant R245fa and 305 n-pentane concentrations as suggested by Le et al, were not considered in the current case [39]. …”

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confidence: 99%

An innovative organic Rankine cycle approach for high temperature applications

Panesar

2016

Energy

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6Organic Rankine Cycles (ORC) using toluene and hexamethyldisiloxane (MM) are put forward as a means of 7 improving the efficiency of automotive heavy duty engines, and provide a reference for comparison in this study. 8Despite an efficiency improvement potential of 4-4.7%, the current ORC approach is not reaching the required fuel 9 savings within the expected costs. As such, innovative pathways to improve the ORC performance and

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“…For instance, Bao et al [64] collected a list of almost 80 pure fluids that have been proposed for their use in ORC systems. In addition, it should be noted that numerous zeotropic mixtures are also recommended to improve the exergetic efficiency of ORC systems ( [65], [66]), besides to achieve more costeffective solutions [67].…”

Section: Organic Working Fluidmentioning

confidence: 99%

Thermo-economic assessment of small-scale organic Rankine cycle for low-grade industrial waste heat recovery based on an experimental application

Pérez¹

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ACKNOWLEDGMENTSThe author is indebted to the Jaume I University for its financial support under the PhD grant PREDOC/2013/28 of 'Convocatòria d'ajudes predoctorals per a la formació de personal investigador del Pla de promoció de la investigació de la Universitat Jaume I de Castelló (Spain)' and the stay support E-2016-08 'Convocatòria d'ajudes per a realitzar estades temporals en altres centres d'investigació, per al personal docent i investigador de la Universitat Jaume 2016'. Also to thank greatly the Minister of Industry of 'Generalitat Valenciana' (Spain) for its financial assistance under project INIDIV2010022, and ExpanderTech (Rank®) and Keros-Cerámica for its collaboration under this project. AGRADECIMIENTOSQuisiera agradecer al director de la tesis, el Dr. Joaquín Navarro Esbrí, la oportunidad brindada y la confianza depositada en mí durante estos años. Gracias por esos consejos que me han permitido llegar hasta aquí.A mis amigos y compañeros del grupo de investigación ISTENER, Fran, Adrián, y Ángel habéis sido un apoyo fundamental para la consecución de este trabajo. A Fran especialmente quiero reconocerle la ayuda que me ha prestado para que este proyecto salga adelante.Hay buenos amigos que estoy seguro han marcado el carácter de esta tesis. Ivan Calvet, quiero agradecerte la fuerza que me has transmitido en cada uno de esos cafés. Sergio Balderrama, gracias por ese punto de vista siempre tan acertado. Y Miguel Manuel de Villena, no olvidaré la experiencia vivida a tu lado.Por supuesto, no hay paciencia más grande que la de aquél que te quiere. Así que gracias a mi familia, Peris -Pérez -Górriz -Pellicer -Llobregat, Baena -Urueña. Para mis padres, un ejemplo a seguir, y para Mar, con quien seguir el ejemplo. ABSTRACTNowadays, the environmental concern is leading researchers to focus on more sustainable energy systems. In this way, small-scale Organic Rankine Cycles (ORC) are receiving an increasing attention to produce electricity from low-grade heat sources.Among the different applications for the ORC adoption, this study focuses on industrial processes. This application raises a great interest due to its high amount of waste heat recoverable, but lacks of in-depth experimental investigations on the topic.Being aware of the economic feasibility relevance for the ORC adoption in practical applications, more cost-effective solutions are being explored in the literature through thermo-economic optimizations. However, the results achieved cannot be discussed with respect to actual projects implemented in industry, due to its absence.In light of this, this thesis proposes as novelty to conduct the thermoeconomic optimization from an experimental application in industry. In this manner, a comprehensive model of the system can be developed and validated from actual data. Accordingly, more realistic results can be reached to assess the economic feasibility of the optimized proposal under the different economic scenarios.The main results obtained in this study show that, by means of a multivariable optimiza...

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Thermodynamic and economic optimizations of a waste heat to power plant driven by a subcritical ORC (Organic Rankine Cycle) using pure or zeotropic working fluid

Cited by 204 publications

References 29 publications

Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids

Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids

An innovative organic Rankine cycle approach for high temperature applications

Thermo-economic assessment of small-scale organic Rankine cycle for low-grade industrial waste heat recovery based on an experimental application

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