Journal of Thermal Science

, Volume 27, Issue 3, pp 223–229 | Cite as

Performance Optimization of Irreversible Air Heat Pumps Considering Size Effect

Article
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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.

Keywords

Irreversible Air Heat Pump Thermodynamic Optimization Heating Load Density Size Effect Finite Time Thermodynamics 

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Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Yuehong Bi
    • 1
    • 2
  • Lingen Chen
    • 3
  • Zemin Ding
    • 3
  • Fengrui Sun
    • 3
  1. 1.Institute of Civil & Architectural EngineeringBeijing University of TechnologyBeijingChina
  2. 2.Beijing Key Laboratory of Green Built Environment and Energy Efficient TechnologyBeijingChina
  3. 3.Institute of Thermal Science and Power EngineeringNaval University of EngineeringWuhanChina

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