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The Entropy Analysis on NH3/CO2 Cascade Refrigeration Cycle

[+] Author Affiliations
Yingbai Xie, Kuikui Cui, Luxiang Zong, Zhichao Wang

North China Electric Power University, Baoding, Hebei, China

Paper No. IMECE2010-40121, pp. 823-828; 6 pages
doi:10.1115/IMECE2010-40121
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climate Change, Parts A and B
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4429-8
  • Copyright © 2010 by ASME

abstract

This paper introduces a cascade refrigeration cycle that uses natural refrigerants of CO2 and NH3 at low temperature. It introduces the character of CO2 and NH3 , besides analyzes the cascade refrigeration cycle. The optimal intermediate temperature of NH3 /CO2 cascade refrigeration cycle is determined by the entropy production minimization method. We analyze the four processes entropy production in both CO2 cycle (LT side) and NH3 cycle (HT side) and research how the total entropy production changes in the conditions of different T0 , different TCL and different ΔT. We also find that in order to enhance the efficiency of NH3 /CO2 cascade refrigeration cycle, it is necessary to reduce ΔT. It can be concluded that NH3 /CO2 cascade refrigeration cycle has a good future.

Copyright © 2010 by ASME

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