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Entropy 2017, 19(9), 446; doi:10.3390/e19090446

Investigation on the Performances of Vuilleumier Cycle Heat Pump Adopting Mixture Refrigerants

Department of Power Engineering, North China Electric Power University, Baoding 071000, China
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Author to whom correspondence should be addressed.
Received: 30 July 2017 / Revised: 22 August 2017 / Accepted: 24 August 2017 / Published: 26 August 2017
(This article belongs to the Section Thermodynamics)

Abstract

The performances of thermodynamics cycles are dependent on the properties of refrigerants. The performances of Vuilleumier (VM) cycle heat pump adopting mixture refrigerants are analyzed by MATLAB software using REFPROP programming. At given operating parameters and configuration, performances of the VM cycle adopting pure refrigerant, H2, He or N2 are compared. Thermodynamic properties of the four type mixtures, namely, He-H2, He-N2, H2-N2 and He-H2-N2, are obtained with total 16 mixing ratio, and the coefficient of performance and the exergy efficiency of these four mixture types in VM cycle heat pump are calculated. The results indicate that within the temperature of heat source 400–1000 K, helium is the best choice of pure refrigerant for VM cycle heat pump. The He-H2 mixture is the best among all binary refrigerant mixtures; the recommended proportion is 1:2. For trinary refrigerant mixture, suggested proportion of helium, hydrogen and nitrogen is 2:2:1. For these recommended mixtures, system COPs (coefficient of performances) are close to 3.3 and exergy efficiencies are about 0.2, which are close to pure refrigerant helium. View Full-Text
Keywords: VM cycle heat pump; coefficient of performance; exergy efficiency; pure refrigerant; mixture refrigerants VM cycle heat pump; coefficient of performance; exergy efficiency; pure refrigerant; mixture refrigerants
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Xie, Y.; Zhong, K. Investigation on the Performances of Vuilleumier Cycle Heat Pump Adopting Mixture Refrigerants. Entropy 2017, 19, 446.

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