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Heating load, heating-load density and COP optimizations of an endoreversible air heat-pump

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  • Bi, Yuehong
  • Chen, Lingen
  • Sun, Fengrui

Abstract

The finite-time thermodynamic performance has been studied of an endoreversible air heat-pump with constant-temperature heat-reservoirs. The heating load, the coefficient of performance (COP), and the heating-load density, i.e. the ratio of heating load to the maximum specific volume in the cycle, are the optimization objectives. The analytical formulae relating the heating load and pressure-ratio, between the COP and pressure-ratio, as well as between the heating-load density and pressure-ratio are derived assuming heat resistance losses occur in the hot- and cold-side heat-exchangers. The influences of the effectiveness of the heat-exchangers and the heat-reservoir temperature-ratio on the heating load, the COP and the heating-load density are analyzed. The cycle performance optimizations are performed by searching the optimal distribution of heat conductance of the hot- and cold-side heat-exchangers for the fixed total heat-exchanger inventory. The influences of some design parameters, including heat-capacity rate of the working fluid, heat-reservoir temperature-ratio and heat-exchanger inventory on the optimal distribution of heat conductance, the maximum heating load and the maximum heating-load density are indicated by numerical examples. The different results obtained from the heating-load optimization and the heating-load density optimization are shown. The air heat-pump design, with heat-loading density optimization, leads to smaller size equipment.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:85:y:2008:i:7:p:607-617
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    References listed on IDEAS

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    1. Chen, Lingen & Sun, Fengrui & Wu, Chih, 2004. "Optimal allocation of heat-exchanger area for refrigeration and air-conditioning plants," Applied Energy, Elsevier, vol. 77(3), pages 339-354, March.
    2. Tu, Youming & Chen, Lingen & Sun, Fengrui & Wu, Chih, 2006. "Cooling load and coefficient of performance optimizations for real air-refrigerators," Applied Energy, Elsevier, vol. 83(12), pages 1289-1306, December.
    3. Şahi̇n, Bahri̇ & Kodal, Ali̇ & Yavuz, Hasbi̇, 1996. "Maximum power density for an endoreversible carnot heat engine," Energy, Elsevier, vol. 21(12), pages 1219-1225.
    4. Zhou, Shengbing & Chen, Lingen & Sun, Fengrui & Wu, Chih, 2004. "Cooling-load density optimization for a regenerated air refrigerator," Applied Energy, Elsevier, vol. 78(3), pages 315-328, July.
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    Cited by:

    1. Roberto Bruno & Francesco Nicoletti & Giorgio Cuconati & Stefania Perrella & Daniela Cirone, 2020. "Performance Indexes of an Air-Water Heat Pump Versus the Capacity Ratio: Analysis by Means of Experimental Data," Energies, MDPI, vol. 13(13), pages 1-19, July.
    2. 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.
    3. 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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