Analysis of a new cross flow heat exchanger flow arrangement - Extension to several rows

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• 作者：Luben Cabezas-Gó ; mez^a ; ^{luben@pucminas.br} ; Hé ; lio Aparecido Navarro^b ; ^{han@sc.usp.br} ; José ; Maria Sá ; iz-Jabardo^c ; ^{mjabardo@cdf.udc.es} ; Sergio de Morais Hanriot^a ; ^{hanriot@pucminas.br} ; Cristiana Brasil Maia^a ; ^{cristiana@pucminas.br}
• 关键词：Cross flow heat exchangers ; Thermal effectiveness ; Heat exchanger efficiency ; Entropy generation ; Entransy dissipation number ; Numerical simulation
• 刊名：International Journal of Thermal Sciences
• 出版年：2012
• 期刊代码：94_12900729
• 类别：et
• 出版时间：May, 2012
• 卷：55
• 期：Complete
• 页码：122-132
• 文件大小：1052 K

摘要

The present paper presents a theoretical analysis of a cross flow heat exchanger with a new flow arrangement comprehending several tube rows. The thermal performance of the proposed flow arrangement is compared with the thermal performance of a typical counter cross flow arrangement that is used in chemical, refrigeration, automotive and air conditioning industries. The thermal performance comparison has been performed in terms of the following parameters: heat exchanger effectiveness and efficiency, dimensionless entropy generation, entransy dissipation number, and dimensionless local temperature differences. It is also shown that the uniformity of the temperature difference field leads to a higher thermal performance of the heat exchanger. In the present case this is accomplished thorough a different organization of the in-tube fluid circuits in the heat exchanger. The relation between the recently introduced 鈥渆ntransy dissipation number鈥?and the conventional thermal effectiveness has been obtained in terms of the 鈥渘umber of transfer units鈥? A case study has been solved to quantitatively to obtain the temperature difference distribution over two rows units involving the proposed arrangement and the counter cross flow one. It has been shown that the proposed arrangement presents better thermal performance regardless the comparison parameter.