Regenerated air cycle potentials in heat pump applications |
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| Affiliation: | 1. Department of Mechanical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK;2. Department of Engineering, King''s College London, Strand, London WC2R 2LS, UK;1. Department of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UK;2. Department of Mechanical Engineering, University of California, Berkeley, 94720, CA, USA |
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| Abstract: | Air (reversed Brayton) cycle has been utilized in the area of refrigeration and cryogenics for several decades, but its potentials in heat pump applications were longtime underestimated. In this paper, a thermodynamic model for the regenerated air heat pump cycle with practical compressor, expander and regenerated heat exchanger was developed. Based on the model, the relations between the system performance and the operating parameters were analyzed. The optimal heating COP (coefficient of performance) and the corresponding pressure ratio were derived. Then, air heat pump cycles (regenerated cycle and basic cycle) and vapor-compression heat pump cycles (CO2 trans-critical cycle and R410A subcritical cycle) were numerically compared. The results indicated that the regenerated air heat pump cycle not only gets the heating capacity in line with the heating load under different operating conditions but also achieves higher COP over trans-critical CO2 heat pump cycle in applications of large temperature difference. |
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| Keywords: | Air cycle Heat pump Model Cycle à air Cycle au CO2 Pompe à chaleur Modèle |
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