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SCIENCE CHINA Technological Sciences, Volume 59 , Issue 10 : 1463-1474(2016) https://doi.org/10.1007/s11431-016-6087-1

Progress of entransy analysis on the air-conditioning system in buildings

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  • ReceivedFeb 26, 2016
  • AcceptedApr 29, 2016
  • PublishedAug 11, 2016

Abstract

It is of great importance to improve the energy performance of the air-conditioning system for building energy conversation. Entransy provides a novel perspective to investigate the losses existing in the air-conditioning system. The progress of entransy analysis in the air-conditioning system is comprehensively investigated in the present study. Firstly missions and characteristics of the air-conditioning system are analyzed with emphasis on heat or mass transfer process. It is found that reducing the temperature difference, i.e. reducing the entransy dissipation helps to improve the performance. Entransy dissipations and thermal resistances of typical transfer processes in the air-conditioning system are presented. Characteristics of sensible heat transfer process and coupled heat and mass transfer processes are researched in terms of entransy dissipation analysis. Reasons leading to entransy dissipation are also clarified with the help of unmatched coefficient ξ. Principles for reducing the entransy dissipation and constructing a high temperature cooling system are summarized on the basis of case studies in typical handling processes. It’s recommended that reducing mixing process, improving match properties are main approaches to reduce the entransy dissipation. The present analysis is beneficial to casting light on the essence of the air-conditioning system and proposing novel approaches for performance optimization.


Acknowledgment

This work was supported by National Natural Science Foundation of China (Grant Nos. 51422808 & 51521005), the National Science & Technology Pillar Program during the 12th Five-year Plan Period (Grant No. 2014BAJ02B01), and the China Postdoctoral Science Foundation (Grant No. 2015M570107).


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