Analyses of an air conditioning system with entropy generation minimization and entransy theory*Project supported by the Youth Programs of Chongqing Three Gorges University, China (Grant No. 13QN18). (20th April 2016)

• Record Type: Journal Article
• Authors: Wu 吴, Yan-Qiu 艳秋; Cai 蔡, Li 黎; Wu 吴, Hong-Juan 鸿娟
• Is Part Of: Chinese physics B. Volume 25:Number 6(2016)
• Publication Date: 2016-04-20
• Subjects: 05.70.Ln; entropy generation -- entransy increase -- entransy dissipation -- optimization analyses -- finite time thermodynamics -- air conditioning system; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1674-1056/25/6/060507
• Languages: English
• ISSNs: 1674-1056

Abstract

Abstract: In this paper, based on the generalized heat transfer law, an air conditioning system is analyzed with the entropy generation minimization and the entransy theory. Taking the coefficient of performance (denoted as COP ) and heat flow rate Q out which is released into the room as the optimization objectives, we discuss the applicabilities of the entropy generation minimization and entransy theory to the optimizations. Five numerical cases are presented. Combining the numerical results and theoretical analyses, we can conclude that the optimization applicabilities of the two theories are conditional. If Q out is the optimization objective, larger entransy increase rate always leads to larger Q out, while smaller entropy generation rate does not. If we take COP as the optimization objective, neither the entropy generation minimization nor the concept of entransy increase is always applicable. Furthermore, we find that the concept of entransy dissipation is not applicable for the discussed cases.