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Journal of Applied Physics : Geometric optimization of an active magnetic regenerative refrigerator via second-law analysis

By Peng Li, Maoqiong Gong, and Jianfeng Wu

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Book Id: WPLBN0002169376
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 25 November 2008

Title: Journal of Applied Physics : Geometric optimization of an active magnetic regenerative refrigerator via second-law analysis  
Author: Peng Li, Maoqiong Gong, and Jianfeng Wu
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Journal of Applied Physics Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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Maoqiong Gong, And Jianfeng W, P. L. (n.d.). Journal of Applied Physics : Geometric optimization of an active magnetic regenerative refrigerator via second-law analysis. Retrieved from http://hawaiilibrary.net/


Description
Description: Previous analyses [ Z. Yan and J. Chen, J. Appl. Phys. 72, 1 (1992) ; J. Chen and Z. Yan, ibid., 84, 1791 (1998) ; Lin et al., Physica B 344, 147 (2004) ; Yang et al., ibid., 364, 33 (2005) ; Xia et al., ibid., 381, 246 (2006). ] of irreversibilities in magnetic refrigerators overlooked several important losses that could be dominant in a real active magnetic regenerative refrigerator (AMRR). No quantitative expressions have been provided yet to estimate the corresponding entropy generations in real AMRRs. The important geometric parameters of AMRRs, such as the aspect ratio of the active magnetic regenerator and the refrigerant diameter, are still arbitrarily chosen. Expressions for calculating different types of entropy generations in the AMRR were derived and used to optimize the aspect ratio and the refrigerant diameter. An optimal coefficient of performance (15.54) was achieved at an aspect ratio of 6.39 and a refrigerant diameter of 1.1 mm for our current system. Further study showed that the dissipative sources (e.g., the fluid friction and the unbalanced magnetic forces) in AMRRs, which were overlooked by previous investigations, could significantly contribute to entropy generations.

 

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