Comparaison de performances entre une pompe A chaleur combinEe au R134a/CO2 et une pompe A chaleur en cascade au R134a/CO2 pour chauffage de locaux
Performance comparison between the combined R134a/CO2 heat pump and cascade R134a/CO2 heat pump for space heating
Abstract In this paper, the performance of combined R134a/CO 2 and cascade R134a/CO 2 systems for space heating was studied and compared under specific operating conditions. A mathematical model was developed for this purpose and was verified by experimental data. The effects of key parameters such as water feed temperature, water supply temperature and ambient temperature on the performance of the two systems were further investigated. Results showed that cascade and combined systems had different preferable application conditions. The cascade system performed better at low ambient temperatures while the combined system performed better under conditions of high ambient temperature and high hot water temperature differences between the system inlet and outlet. A correlation was established and an operating condition coefficient was proposed to determine which system should be used for any given set of working conditions. Highlights The combined R134a/CO 2 and cascade R134a/CO 2 system was compared and studied. Effect of hot water and ambient temperatures on the two systems was investigated. The two systems showed different preferable operating conditions. A correlation was proposed to identify the system for any given operating condition.
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