Abstract
Based on the concept of the entransy which characterizes heat transfer ability, a new heat exchanger performance evaluation criterion termed the entransy dissipation number is established. Our analysis shows that the decrease of the entransy dissipation number always increases the heat exchanger effectiveness for fixed heat capacity rate ratio. Therefore, the smaller the entransy dissipation number, the better the heat exchanger performance is. The entransy dissipation number in terms of the number of exchanger heat transfer units or heat capacity rate ratio correctly exhibits the global performance of the counter-, cross- and parallel-flow heat exchangers. In comparison with the heat exchanger performance evaluation criteria based on entropy generation, the entransy dissipation number demonstrates some distinct advantages. Furthermore, the entransy dissipation number reflects the degree of irreversibility caused by flow imbalance.
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References
Yilmaz M, Sara O N, Karsli S. Performance evaluation criteria for heat exchangers based on second law analysis. Exergy, an International Journal, 2001, 1: 78–294
Kondepudi D, Prigogine I. Modern Thermodynamics: from Heat Engines to Dissipative Structures. London: Wiley, 1998
Bejan A. Entropy Generation through Heat and Fluid Flow. New York: Wiley, 1982
Bejan A. Advanced engineering thermodynamics. New York: Wiley, 1988
Bertola V, Cafaro E. A critical analysis of the minimum entropy production theorem and its application to heat and fluid flow. International Journal of Heat and Mass Transfer, 2008, 51: 1907–1912
Hesselgreaves J E. Rationalisation of second law analysis of heat exchangers. International Journal of Heat and Mass Transfer, 2000, 43: 4189–4204
Guo Z Y, Cheng X G, Xia Z Z. Least dissipation principle of heat transport potential capacity and its application in heat conduction optimization. Chinese Sci Bull, 2003, 48: 406–410
Guo Z Y, Zhu H Y, Liang X G. Entransy-A physical quantity describing heat transfer ability. Inter J Heat Mass Trans, 2007, 50: 2545–2556
Han G Z, Guo Z Y. Physical mechanism of heat conduction ability dissipation and its analytical expression. Proceeding of the CSEE, 2007, 27: 98–102.
Cheng X G. Entranspy and its applications in heat transfer optimization. Ph.D. Thesis. Beijing: Tsinghua University, 2004.4
Shi M Z, Wang Z Z. Principle and Design of Heat Transfer Device. Nanjing: Southeast University Press, 1996
Shah R K, Sekuli D P. Fundamentals of Heat Exchanger Design. New Jersey: Wiley, 2003
Xu Z M, Yang S R, Chen Z Q. A modified entropy generation number for heat exchanger. J Thermal Sci, 1996, 5: 257–263
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Supported by the National Basic Research Program of China (Grant No. 2007CB206900)
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Guo, J., Cheng, L. & Xu, M. Entransy dissipation number and its application to heat exchanger performance evaluation. Chin. Sci. Bull. 54, 2708–2713 (2009). https://doi.org/10.1007/s11434-009-0295-z
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DOI: https://doi.org/10.1007/s11434-009-0295-z