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Refrigeration Performance and Entropy Generation Analysis for Reciprocating Magnetic Refrigerator with Gd Plates

In the current work, a novel 2D numerical model of stationary grids was developed for reciprocating magnetic refrigerators, with Gd plates, in which the magneto-caloric properties, derived from the Weiss molecular field theory, were adopted for the built-in energy source of the magneto-caloric effec...

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Autores principales: You, Yonghua, Wu, Zhongda, Yang, Yong, Yu, Jie, Zhang, Dong, Zhang, Zhuang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7512948/
https://www.ncbi.nlm.nih.gov/pubmed/33265517
http://dx.doi.org/10.3390/e20060427
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author You, Yonghua
Wu, Zhongda
Yang, Yong
Yu, Jie
Zhang, Dong
Zhang, Zhuang
author_facet You, Yonghua
Wu, Zhongda
Yang, Yong
Yu, Jie
Zhang, Dong
Zhang, Zhuang
author_sort You, Yonghua
collection PubMed
description In the current work, a novel 2D numerical model of stationary grids was developed for reciprocating magnetic refrigerators, with Gd plates, in which the magneto-caloric properties, derived from the Weiss molecular field theory, were adopted for the built-in energy source of the magneto-caloric effect. The numerical simulation was conducted under the conditions of different structural and operational parameters, and the effects of the relative fluid displacement (φ) on the specific refrigeration capacity (qref) and the Coefficient of Performance (COP) were obtained. Besides the variations of entropy, the generation rate and number were studied and the contours of the local entropy generation rate are presented for discussion. From the current work, it is found that with an increase in φ, both the qref and COP followed the convex variation trend, while the entropy generation number (Ns) varied concavely. As for the current cases, the maximal qref and COP were equal to 151.2 kW/m(3) and 9.11, respectively, while the lowest Ns was the value of 2.4 × 10(−4) K(−1). However, the optimal φ for the largest qref and COP, and for the lowest Ns, were inconsistent, thus, some compromises need be made in the optimization of magnetic refrigerators.
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spelling pubmed-75129482020-11-09 Refrigeration Performance and Entropy Generation Analysis for Reciprocating Magnetic Refrigerator with Gd Plates You, Yonghua Wu, Zhongda Yang, Yong Yu, Jie Zhang, Dong Zhang, Zhuang Entropy (Basel) Article In the current work, a novel 2D numerical model of stationary grids was developed for reciprocating magnetic refrigerators, with Gd plates, in which the magneto-caloric properties, derived from the Weiss molecular field theory, were adopted for the built-in energy source of the magneto-caloric effect. The numerical simulation was conducted under the conditions of different structural and operational parameters, and the effects of the relative fluid displacement (φ) on the specific refrigeration capacity (qref) and the Coefficient of Performance (COP) were obtained. Besides the variations of entropy, the generation rate and number were studied and the contours of the local entropy generation rate are presented for discussion. From the current work, it is found that with an increase in φ, both the qref and COP followed the convex variation trend, while the entropy generation number (Ns) varied concavely. As for the current cases, the maximal qref and COP were equal to 151.2 kW/m(3) and 9.11, respectively, while the lowest Ns was the value of 2.4 × 10(−4) K(−1). However, the optimal φ for the largest qref and COP, and for the lowest Ns, were inconsistent, thus, some compromises need be made in the optimization of magnetic refrigerators. MDPI 2018-06-01 /pmc/articles/PMC7512948/ /pubmed/33265517 http://dx.doi.org/10.3390/e20060427 Text en © 2018 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
You, Yonghua
Wu, Zhongda
Yang, Yong
Yu, Jie
Zhang, Dong
Zhang, Zhuang
Refrigeration Performance and Entropy Generation Analysis for Reciprocating Magnetic Refrigerator with Gd Plates
title Refrigeration Performance and Entropy Generation Analysis for Reciprocating Magnetic Refrigerator with Gd Plates
title_full Refrigeration Performance and Entropy Generation Analysis for Reciprocating Magnetic Refrigerator with Gd Plates
title_fullStr Refrigeration Performance and Entropy Generation Analysis for Reciprocating Magnetic Refrigerator with Gd Plates
title_full_unstemmed Refrigeration Performance and Entropy Generation Analysis for Reciprocating Magnetic Refrigerator with Gd Plates
title_short Refrigeration Performance and Entropy Generation Analysis for Reciprocating Magnetic Refrigerator with Gd Plates
title_sort refrigeration performance and entropy generation analysis for reciprocating magnetic refrigerator with gd plates
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7512948/
https://www.ncbi.nlm.nih.gov/pubmed/33265517
http://dx.doi.org/10.3390/e20060427
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