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Optimization between heating load and entropy-production rate for endoreversible absorption heat-transformers

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  • Sun, Fengrui
  • Qin, Xiaoyong
  • Chen, Lingen
  • Wu, Chih

Abstract

For an endoreversible four-heat-reservoir absorption heat-transformer cycle, for which a linear (Newtonian) heat-transfer law applies, an ecological optimization criterion is proposed for the best mode of operation of the cycle. This involves maximizing a function representing the compromise between the heating load and the entropy-production rate. The optimal relation between the ecological criterion and the COP (coefficient of performance), the maximum ecological criterion and the corresponding COP, heating load and entropy production rate, as well as the ecological criterion and entropy-production rate at the maximum heating load are derived using finite-time thermodynamics. Moreover, compared with the heating-load criterion, the effects of the cycle parameters on the ecological performance are studied by numerical examples. These show that achieving the maximum ecological criterion makes the entropy-production rate decrease by 77.0% and the COP increase by 55.4% with only 27.3% heating-load losses compared with the maximum heating-load objective. The results reflect that the ecological criterion has long-term significance for optimal design of absorption heat-transformers.

Suggested Citation

  • Sun, Fengrui & Qin, Xiaoyong & Chen, Lingen & Wu, Chih, 2005. "Optimization between heating load and entropy-production rate for endoreversible absorption heat-transformers," Applied Energy, Elsevier, vol. 81(4), pages 434-448, August.
    • Handle: RePEc:eee:appene:v:81:y:2005:i:4:p:434-448
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    References listed on IDEAS

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    1. Qin, Xiaoyong & Chen, Lingen & Sun, Fengrui & Wu, Chih, 2004. "An absorption heat-transformer and its optimal performance," Applied Energy, Elsevier, vol. 78(3), pages 329-346, July.
    2. Chen, Lingen & Zhou, Jianping & Sun, Fengrui & Wu, Chih, 2004. "Ecological optimization for generalized irreversible Carnot engines," Applied Energy, Elsevier, vol. 77(3), pages 327-338, March.
    3. Yan, Zijun & Lin, Guoxing, 2000. "Ecological optimization criterion for an irreversible three-heat-source refrigerator," Applied Energy, Elsevier, vol. 66(3), pages 213-224, July.
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    Cited by:

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    2. Parham, Kiyan & Khamooshi, Mehrdad & Tematio, Daniel Boris Kenfack & Yari, Mortaza & Atikol, Uğur, 2014. "Absorption heat transformers – A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 34(C), pages 430-452.
    3. Colorado, D. & Hernández, J.A. & Rivera, W. & Martínez, H. & Juárez, D., 2011. "Optimal operation conditions for a single-stage heat transformer by means of an artificial neural network inverse," Applied Energy, Elsevier, vol. 88(4), pages 1281-1290, April.
    4. Qin, Xiaoyong & Chen, Lingen & Ge, Yanlin & Sun, Fengrui, 2015. "Thermodynamic modeling and performance analysis of the variable-temperature heat reservoir absorption heat pump cycle," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 436(C), pages 788-797.
    5. Donnellan, Philip & Cronin, Kevin & Byrne, Edmond, 2015. "Recycling waste heat energy using vapour absorption heat transformers: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 42(C), pages 1290-1304.

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