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Energies 2016, 9(5), 322; doi:10.3390/en9050322

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

1
Technical University of Denmark, Building 403, Nils Koppels Allé, DK-2800 Kgs. Lyngby, Denmark
2
Department of Shipping and Marine Technology, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
This paper is an extended version of our paper published in Andreasen, J.G.; Kærn, M.R.; Pierobon, L.; Larsen, U.; Haglind, F. Multi-objective optimization of organic Rankine cycle power plants using pure and mixed working fluids. Proceedings of the 3rd International Seminar on ORC Power Systems Brussels, Belgium, 2015, Paper ID: 32, available online: www.asme-orc2015.be/online/proceedings/documents/32.pdf
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Author to whom correspondence should be addressed.
Academic Editor: Sylvain Quoilin
Received: 2 February 2016 / Revised: 15 April 2016 / Accepted: 19 April 2016 / Published: 27 April 2016
View Full-Text   |   Download PDF [4366 KB, uploaded 27 April 2016]   |  

Abstract

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$. View Full-Text
Keywords: organic Rankine cycle; zeotropic mixture; multi-objective optimization; cost estimation; heat exchanger design; low temperature heat organic Rankine cycle; zeotropic mixture; multi-objective optimization; cost estimation; heat exchanger design; low temperature heat
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Andreasen, J.G.; Kærn, M.R.; Pierobon, L.; Larsen, U.; Haglind, F. Multi-Objective Optimization of Organic Rankine Cycle Power Plants Using Pure and Mixed Working Fluids. Energies 2016, 9, 322.

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