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Multi-Objective Optimization of the Basic and Regenerative ORC Integrated with Working Fluid Selection
A multi-objective optimization based on the non-dominated sorting genetic algorithm (NSGA-II) is carried out in the present work for the basic organic Rankine cycle (BORC) and regenerative ORC (RORC) systems. The selection of working fluids is integrated into multi-objective optimization by paramete...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9323339/ https://www.ncbi.nlm.nih.gov/pubmed/35885125 http://dx.doi.org/10.3390/e24070902 |
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author | Zhou, Yuhao Ruan, Jiongming Hong, Guotong Miao, Zheng |
author_facet | Zhou, Yuhao Ruan, Jiongming Hong, Guotong Miao, Zheng |
author_sort | Zhou, Yuhao |
collection | PubMed |
description | A multi-objective optimization based on the non-dominated sorting genetic algorithm (NSGA-II) is carried out in the present work for the basic organic Rankine cycle (BORC) and regenerative ORC (RORC) systems. The selection of working fluids is integrated into multi-objective optimization by parameterizing the pure working fluids into a two-dimensional array. Two sets of decision indicators, exergy efficiency vs. thermal efficiency and exergy efficiency vs. levelized energy cost (LEC), are adopted and examined. Five decision variables including the turbine inlet temperature, vapor superheat degree, the evaporator and condenser pinch temperature differences, and the mass fraction of the mixture are optimized. It is found that the turbine inlet temperature is the most effective factor for both the BORC and RORC systems. Compared to the reverse variation of exergy efficiency and thermal efficiency, only a weak conflict exists between the exergy efficiency and LEC which tends to make the binary objective optimization be a single objective optimization. The RORC provides higher thermal efficiency than BORC at the same exergy efficiency while the LEC of RORC also becomes higher because the bare module cost of buying one more heat exchange is higher than the cost reduction due to the reduced heat transfer area. Under the heat source temperature of 423.15 K, the final obtained exergy and thermal efficiencies are 45.6% and 16.6% for BORC, and 38.6% and 20.7% for RORC, respectively. |
format | Online Article Text |
id | pubmed-9323339 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-93233392022-07-27 Multi-Objective Optimization of the Basic and Regenerative ORC Integrated with Working Fluid Selection Zhou, Yuhao Ruan, Jiongming Hong, Guotong Miao, Zheng Entropy (Basel) Article A multi-objective optimization based on the non-dominated sorting genetic algorithm (NSGA-II) is carried out in the present work for the basic organic Rankine cycle (BORC) and regenerative ORC (RORC) systems. The selection of working fluids is integrated into multi-objective optimization by parameterizing the pure working fluids into a two-dimensional array. Two sets of decision indicators, exergy efficiency vs. thermal efficiency and exergy efficiency vs. levelized energy cost (LEC), are adopted and examined. Five decision variables including the turbine inlet temperature, vapor superheat degree, the evaporator and condenser pinch temperature differences, and the mass fraction of the mixture are optimized. It is found that the turbine inlet temperature is the most effective factor for both the BORC and RORC systems. Compared to the reverse variation of exergy efficiency and thermal efficiency, only a weak conflict exists between the exergy efficiency and LEC which tends to make the binary objective optimization be a single objective optimization. The RORC provides higher thermal efficiency than BORC at the same exergy efficiency while the LEC of RORC also becomes higher because the bare module cost of buying one more heat exchange is higher than the cost reduction due to the reduced heat transfer area. Under the heat source temperature of 423.15 K, the final obtained exergy and thermal efficiencies are 45.6% and 16.6% for BORC, and 38.6% and 20.7% for RORC, respectively. MDPI 2022-06-29 /pmc/articles/PMC9323339/ /pubmed/35885125 http://dx.doi.org/10.3390/e24070902 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Zhou, Yuhao Ruan, Jiongming Hong, Guotong Miao, Zheng Multi-Objective Optimization of the Basic and Regenerative ORC Integrated with Working Fluid Selection |
title | Multi-Objective Optimization of the Basic and Regenerative ORC Integrated with Working Fluid Selection |
title_full | Multi-Objective Optimization of the Basic and Regenerative ORC Integrated with Working Fluid Selection |
title_fullStr | Multi-Objective Optimization of the Basic and Regenerative ORC Integrated with Working Fluid Selection |
title_full_unstemmed | Multi-Objective Optimization of the Basic and Regenerative ORC Integrated with Working Fluid Selection |
title_short | Multi-Objective Optimization of the Basic and Regenerative ORC Integrated with Working Fluid Selection |
title_sort | multi-objective optimization of the basic and regenerative orc integrated with working fluid selection |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9323339/ https://www.ncbi.nlm.nih.gov/pubmed/35885125 http://dx.doi.org/10.3390/e24070902 |
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