Numerical Study of Entropy Generation Within Thermoacoustic Heat Exchangers with Plane Fins

Entropy

Antonio Piccolo¹  Umberto Lucia¹ 

[1] Department of Engineering, University of Messina, Contrada di Dio, 98166 Messina, Italy

关键词: thermoacoustics;    heat;    sound;    entropy generation;   

DOI  :  10.3390/e17127875

来源: mdpi

【 摘 要 】

In this paper a simplified two-dimensional computational model for studying the entropy generation characteristics of thermoacoustic heat exchangers with plane fins is presented. The model integrates the equations of the standard linear thermoacoustic theory into an energy balance-based numerical calculus scheme. Relevant computation results are the spatial distribution of the time-averaged temperature, heat fluxes and entropy generation rates within a channel of a parallel-plate stack and adjoining heat exchangers. For a thermoacoustic device working in the refrigeration mode, this study evidences as a target refrigeration output level can be achieved selecting simultaneously the heat exchangers fin length and fin interspacing for minimum entropy generation and that the resulting configuration is a point of maximum coefficient of performance. The proposed methodology, when extended to other configurations, could be used as a viable design tool for heat exchangers in thermoacoustic applications.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.