Preprint Article Version 1 This version is not peer-reviewed

Experimental Study on the Cycle Performance Characteristics of the CO2 Heat Pump System under the Cooling Condition

Version 1 : Received: 5 December 2017 / Approved: 11 December 2017 / Online: 11 December 2017 (12:30:52 CET)

How to cite: Kang, H.J.; Wang, Z.H.; Son, J.; Byun, S.; Kwon, Y. Experimental Study on the Cycle Performance Characteristics of the CO2 Heat Pump System under the Cooling Condition. Preprints 2017, 2017120063 (doi: 10.20944/preprints201712.0063.v1). Kang, H.J.; Wang, Z.H.; Son, J.; Byun, S.; Kwon, Y. Experimental Study on the Cycle Performance Characteristics of the CO2 Heat Pump System under the Cooling Condition. Preprints 2017, 2017120063 (doi: 10.20944/preprints201712.0063.v1).

Abstract

Developing high performance HVAC system using natural refrigerants including carbon dioxide (CO2) has been important in respect of environmental preservation and associated technologies. Thus studies to optimize the HVAC (heating ventilation air conditioner) system using natural refrigerants through clarifying the cycle performance characteristics are necessary. The CO2 heat pump system using air and water sources was consisted to examine its performance characteristics, and by varying conditions of several factors that affect or characterize the system performance like the amount of refrigerant charge, EEV (electronic expansion valve) opening, and internal heat exchanger under cooling mode. The performance characteristics of CO2 heat pump system were tested by using an air enthalpy calorimeter. In the case of the CO2 heat pump system without internal heat exchanger, the opening of #3 EEV and #4 EEV was 60% and refrigerant charge amount was 5,600g. However, in the case of that with internal heat exchanger, the best performance was obtained when the opening of #2 EEV is 20%. From the present studies, it was observed that the performance variation and operational characteristics of the CO2 heat pump system were affected by design factors like refrigerant charge amount, EEV opening, and internal heat exchanger and thereby, the configuration on an optimal operation conditions of the system was enabled.

Subject Areas

Capacity; Cooling and heating; CO2; Cycle performance;, EEV; Heat pump; Internal heat exchanger

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