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Heat pump systems for commercial building with variable refrigerant flow(VRF) are expanding a market due to high energy efficiency, lower maintenance cost and easy installation comparing with the conventional heat pump with the constant refrigerant flow. In general, heat pump systems degrade the energy efficiency in the extremely low temperature regions. In this study, VRF heat pump system with refrigerant heating is experimentally investigated to overcome the low heating performance in the extremely low temperature regions. VRF heat pump system with refrigerant heating is found out the sufficient heating performance in the -25 degree tem-perature condition comparing with the conventional heat pump system and is obtained more than 2,500 kPa high pressure in the evaporator at low temperature.Keywords:VRF(Variable Refrigerant Flow), Refrigerant heating( ), Building Multi( ), R410A( R410A), BLDC Inverter(BLDC ), Burner(), Heat source() †Corresponding author Tel.: +82-51-510-2455; fax: +82-51-582-6368 E-mail address: cheeky81@pusan.ac.kr

Heating Performance Evaluation of the VRF Heat Pump System with Refrigerant Heating Cycle for the Extreme Cold Region