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Thermodynamic analysis of the operation of two-stage metal-hydride heat pumps

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  • Sun, Da-Wen

Abstract

One of the most important applications of metal hydrides is for heat pumps. A two-stage heat pump is superior to a single-stage heat pump because the former has higher efficiency and wider operational temperature range. This paper carries out a systematic study on two-stage heat pumps. Six cycles of two-stage heat pumps are analysed and compared, the selection of metal hydrides for these heat pumps is discussed, the actual COP equations are derived and the effects of some parameters on COP are examined. The study shows that the low-pressure-side two-stage heat pump is suitable for heat upgrading and the high-pressure-side two-stage heat pumps for heat amplifying and refrigerating. For high efficiency of the systems, the metal hydrides used should have [Delta]HH/[Delta]HM = 1 and [Delta]HM/[Delta]HL

Suggested Citation

  • Sun, Da-Wen, 1996. "Thermodynamic analysis of the operation of two-stage metal-hydride heat pumps," Applied Energy, Elsevier, vol. 54(1), pages 29-47, May.
    • Handle: RePEc:eee:appene:v:54:y:1996:i:1:p:29-47
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    Cited by:

    1. Yu, Y.Q. & Zhang, P. & Wu, J.Y. & Wang, R.Z., 2008. "Energy upgrading by solid-gas reaction heat transformer: A critical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(5), pages 1302-1324, June.
    2. Qin, Fei & Zhang, Guiying & Xue, Qingfeng & Zou, Huiming & Tian, Changqing, 2017. "Experimental investigation and theoretical analysis of heat pump systems with two different injection portholes compressors for electric vehicles," Applied Energy, Elsevier, vol. 185(P2), pages 2085-2093.
    3. Chung, C.A. & Yang, Su-Wen & Yang, Chien-Yuh & Hsu, Che-Weu & Chiu, Pai-Yuh, 2013. "Experimental study on the hydrogen charge and discharge rates of metal hydride tanks using heat pipes to enhance heat transfer," Applied Energy, Elsevier, vol. 103(C), pages 581-587.
    4. Yang, Fusheng & Wu, Zhen & Liu, Shengzhe & Zhang, Yang & Wang, Geoff & Zhang, Zaoxiao & Wang, Yuqi, 2018. "Theoretical formulation and performance analysis of a novel hydride heat Pump(HHP) integrated heat recovery system," Energy, Elsevier, vol. 163(C), pages 208-220.
    5. Sajid Ahmed, Syed & Srinivasa Murthy, S., 2004. "Analysis of a novel metal hydride cycle for simultaneous heating and cooling," Renewable Energy, Elsevier, vol. 29(4), pages 615-631.

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