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Analyses of an air conditioning system with entropy generation minimization and entransy theory
Chinese Physics B, 2016 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 ...
吴艳秋, 蔡黎, 吴鸿娟
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Constructal study on a cylindrical heat source based on entransy theory
Chinese Science Bulletin, 2014 基于构形理论和(火积)理论, 以当量热阻为目标对层流冷却条件下的圆柱体热源进行构形研究, 分析热源直径和导热系数对其传热性能的影响. 结果表明: 在热源体积一定的条件下, 不存在最佳热源直径使得其当量热阻取得最小值. 随着热源直径的减小、导热系数的增大, 热源当量热阻减小, 此时热源系统的整体传热性能得到提高. 此外, 圆柱体热源表面温度沿来流方向逐渐增大, 且其表面换热系数沿来流方向逐渐减小. 本文所得结果对热源的优化设计有一定的参考价值.
Lingen Chen +4 more
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Performance Analysis of the Absorption Heat Pump Systems Based on the Entransy Theory
Applied Mechanics and Materials, 2014 The entransy efficiency expression of the absorption heat pump systems was defined in this paper, combined with the concept of the entransy and based on the model of a four temperature level absorption heat pump cycle. The relationship between the heating coefficient of the absorption heat pump and heating rate with the changes of the entransy ...
Qi Zhao, Chen Wang, Feng Han
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A novel method based on entransy theory for setting energy targets of heat exchanger network
Chinese Journal of Chemical Engineering, 2017Abstract A T-Q diagram based on entransy theory is applied to graphically and quantitatively describe the irreversibility of the heat transfer processes. The hot and cold composite curves can be obtained in the T-Q diagram. The entransy recovery and entransy dissipation that are affected by temperature differences can be obtained through the shaded ...
Li Xia, Xiaoyan Sun, Shuguang Xiang
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Constructal optimization for H-shaped multi-scale heat exchanger based on entransy theory
Science China Technological Sciences, 2012Analogizing with the definition of thermal efficiency of a heat exchanger, the entransy dissipation efficiency of a heat exchanger is defined as the ratio of dimensionless entransy dissipation rate to dimensionless pumping power of the heat exchanger.
Lingen Chen, Zhihui Xie
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Energy, 2013 The vapor-compression refrigeration systems have been one of the essential energy conversion systems for humankind and exhausting huge amounts of energy nowadays. Surrounding the energy efficiency promotion of the systems, there are lots of effectual optimization methods but mainly relied on engineering experience and computer simulations rather than ...
Yun-Chao Xu, Qun Chen
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The application of entransy dissipation theory in optimization design of heat exchanger
Applied Thermal Engineering, 2011 Jiangfeng Guo, Mingtian Xu
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A new mathematical model for multi-scale thermal management of data centers using entransy theory
Building Simulation, 2018 Hao Tian
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Application of entransy dissipation theory in heat convection
Frontiers of Energy and Power Engineering in China, 2009In the present work, formulas for calculating the rates of the local thermodynamic entransy dissipation in convective heat transfer in general, and the internal and external flows in particular, are established. Practically, these results may facilitate the application of entransy dissipation theory in thermal engineering. Theoretically they shed light
Mingtian Xu, Jiangfeng Guo, Lin Cheng
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International Journal of Heat and Mass Transfer, 2016 Hai-Dong Yu, Guoqiang Xu, Haiwang Li
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