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Performance Optimization of Irreversible Air Heat Pumps Considering Size Effect

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Abstract

Considering the size of an irreversible air heat pump (AHP), heating load density (HLD) is taken as thermodynamic optimization objective by using finite-time thermodynamics. Based on an irreversible AHP with infinite reservoir thermal-capacitance rate model, the expression of HLD of AHP is put forward. The HLD optimization processes are studied analytically and numerically, which consist of two aspects: (1) to choose pressure ratio; (2) to distribute heat-exchanger inventory. Heat reservoir temperatures, heat transfer performance of heat exchangers as well as irreversibility during compression and expansion processes are important factors influencing on the performance of an irreversible AHP, which are characterized with temperature ratio, heat exchanger inventory as well as isentropic efficiencies, respectively. Those impacts of parameters on the maximum HLD are thoroughly studied. The research results show that HLD optimization can make the size of the AHP system smaller and improve the compactness of system.

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Authors and Affiliations

  1. Institute of Civil & Architectural Engineering, Beijing University of Technology, Beijing, 100124, China

    Yuehong Bi

  2. Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing, 100124, China

    Yuehong Bi

  3. Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan, 430033, China

    Lingen Chen, Zemin Ding & Fengrui Sun

Authors
  1. Yuehong Bi
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  2. Lingen Chen
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  3. Zemin Ding
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  4. Fengrui Sun
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Correspondence to Lingen Chen.

Additional information

This work was supported by National Natural Science Foundation of China (NSFC) under the contracts No.51776008 and No.51376012.

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Bi, Y., Chen, L., Ding, Z. et al. Performance Optimization of Irreversible Air Heat Pumps Considering Size Effect. J. Therm. Sci. 27, 223–229 (2018). https://doi.org/10.1007/s11630-018-1003-6

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  • DOI: https://doi.org/10.1007/s11630-018-1003-6

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