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The occurrence of pinch point and its effects on the performance of high temperature heat pump

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Listed:
  • Liu, Zhaoyong
  • Zhao, Li
  • Zhao, Xuezheng
  • Li, Hailong

Abstract

Zeotropic mixtures are popular alternatives to chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) in the high temperature heat pump system. Zeotropic mixtures exhibit two major characteristics during phase change: temperature gliding and a nonlinear relationship between temperature and enthalpy. The theory proposed by Venkatarathnam that the nonlinear relationship between temperature and enthalpy in the two phase region for zeotropic mixtures can cause pinch points were verified experimentally. Results also show that the variations of the maximum temperature difference and the minimum temperature difference change the mean temperature difference in the same way, and further change the exergy loss in the same way. Therefore, when selecting zeotropic mixtures as working fluids in the high temperature heat pump, it is of great importance to check the pinch points occurring in condenser and evaporator. The zeotropic mixture that has a smaller maximum temperature difference in condenser and a smaller minimum temperature difference in evaporator can give a higher COP.

Suggested Citation

  • Liu, Zhaoyong & Zhao, Li & Zhao, Xuezheng & Li, Hailong, 2012. "The occurrence of pinch point and its effects on the performance of high temperature heat pump," Applied Energy, Elsevier, vol. 97(C), pages 869-875.
    • Handle: RePEc:eee:appene:v:97:y:2012:i:c:p:869-875
    DOI: 10.1016/j.apenergy.2011.12.061
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    Cited by:

    1. Mateu-Royo, Carlos & Navarro-Esbrí, Joaquín & Mota-Babiloni, Adrián & Molés, Francisco & Amat-Albuixech, Marta, 2019. "Experimental exergy and energy analysis of a novel high-temperature heat pump with scroll compressor for waste heat recovery," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
    2. Yang, Zhao & Wu, Xi, 2013. "Retrofits and options for the alternatives to HCFC-22," Energy, Elsevier, vol. 59(C), pages 1-21.
    3. Yang, Zhao & Zhuo, Yang & Ercang, Luo & Yuan, Zhou, 2014. "Travelling-wave thermoacoustic high-temperature heat pump for industrial waste heat recovery," Energy, Elsevier, vol. 77(C), pages 397-402.
    4. El-Morsi, Mohamed, 2015. "Energy and exergy analysis of LPG (liquefied petroleum gas) as a drop in replacement for R134a in domestic refrigerators," Energy, Elsevier, vol. 86(C), pages 344-353.
    5. Liu, Jian & Xu, Yantao & Zhang, Yaning & Shuai, Yong & Li, Bingxi, 2022. "Multi-objective optimization of low temperature cooling water organic Rankine cycle using dual pinch point temperature difference technologies," Energy, Elsevier, vol. 240(C).
    6. Mota-Babiloni, Adrián & Mateu-Royo, Carlos & Navarro-Esbrí, Joaquín & Molés, Francisco & Amat-Albuixech, Marta & Barragán-Cervera, Ángel, 2018. "Optimisation of high-temperature heat pump cascades with internal heat exchangers using refrigerants with low global warming potential," Energy, Elsevier, vol. 165(PB), pages 1248-1258.
    7. Zheng, Nan & Song, Weidong & Zhao, Li, 2013. "Theoretical and experimental investigations on the changing regularity of the extreme point of the temperature difference between zeotropic mixtures and heat transfer fluid," Energy, Elsevier, vol. 55(C), pages 541-552.

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