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An important feature of air heat pump cycle: Heating capacity in line with heating load

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  • Zhang, Chun-Lu
  • Yuan, Han

Abstract

In the conventional vapor-compression heat pumps, the heating capacity and the heating load usually vary in opposite directions, which results in a mismatch of the heating capacity and the heating load at off-design conditions. Air (reversed Brayton) cycle is a potential substitute for the conventional vapor-compression cycles. This paper proved that in theory the air heat pump cycle can make the heating capacity in line with the heating load at a stable level of heating COP (coefficient of performance). A thermodynamic model for the air heat pump cycle with practical compressor and expander was developed. The optimal heating COP and the corresponding pressure ratio were derived from the model. Then the cycle performance was analytically expressed under the optimal COP conditions. The heating capacity under different operating conditions was found in line with the heating load. Comparisons between the air heat pump cycle and two typical vapor-compression heat pump cycles were numerically done for further verification. It also turned out that the energy efficiency of air heat pump is comparable to the transcritical CO2 heat pump, particularly at large temperature difference.

Suggested Citation

  • Zhang, Chun-Lu & Yuan, Han, 2014. "An important feature of air heat pump cycle: Heating capacity in line with heating load," Energy, Elsevier, vol. 72(C), pages 405-413.
    • Handle: RePEc:eee:energy:v:72:y:2014:i:c:p:405-413
    DOI: 10.1016/j.energy.2014.05.055
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    References listed on IDEAS

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    1. Wang, Xiaoxin & Yuan, Xiugan, 2007. "Reuse of condensed water to improve the performance of an air-cycle refrigeration system for transport applications," Applied Energy, Elsevier, vol. 84(9), pages 874-881, September.
    2. Bi, Yuehong & Chen, Lingen & Sun, Fengrui, 2008. "Heating load, heating-load density and COP optimizations of an endoreversible air heat-pump," Applied Energy, Elsevier, vol. 85(7), pages 607-617, July.
    3. Yuehong Bi & Lingen Chen & Fengrui Sun, 2009. "Ecological, exergetic efficiency and heating load optimizations for endoreversible variable-temperature heat reservoir simple air heat pump cycles," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 5(1), pages 7-17, October.
    4. White, A.J., 2009. "Thermodynamic analysis of the reverse Joule-Brayton cycle heat pump for domestic heating," Applied Energy, Elsevier, vol. 86(11), pages 2443-2450, November.
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    Cited by:

    1. Ahn, Jae Hwan & Lee, Joo Seong & Baek, Changhyun & Kim, Yongchan, 2016. "Performance improvement of a dehumidifying heat pump using an additional waste heat source in electric vehicles with low occupancy," Energy, Elsevier, vol. 115(P1), pages 67-75.
    2. Yang, Liang & Yuan, Han & Peng, Jing-Wei & Zhang, Chun-Lu, 2016. "Performance modeling of air cycle heat pump water heater in cold climate," Renewable Energy, Elsevier, vol. 87(P3), pages 1067-1075.
    3. Cui, Haijiao & Li, Nianping & Peng, Jinqing & Cheng, Jianlin & Li, Shengbing, 2016. "Study on the dynamic and thermal performances of a reversibly used cooling tower with upward spraying," Energy, Elsevier, vol. 96(C), pages 268-277.
    4. Zhang, Chun-Lu & Yuan, Han & Cao, Xiang, 2015. "New insight into regenerated air heat pump cycle," Energy, Elsevier, vol. 91(C), pages 226-234.

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