연료전지 스택 폐열 활용 전동식 난방시스템 성능 특성 연구

다국어 초록 (Multilingual Abstract)

The objective of this study was to investigate heating performance characteristics of stack coolant heat-sourced electric driven air conditioning system in a fuel cell electric vehicle(FCEV). In order to analyze heating performance characteristics of electric driven air conditioning system with plate type heat exchanger between stack coolant and a refrigerant, R-134a, each component in the heat pump system was installed and tested under various operating conditions, such as air inlet temperature of inner condenser and compressor speed. Heating performance of tested system was thought to be heating capacity and COP(Coefficient of Performance) after various experiments according to FCEV driving conditions. Because tested system had EEV(Electric Expansion Valve) to control the refrigerant mass flow rate, heating performance was analyzed along with EEV opening. When the air inlet temperature of inner condenser was varied from 0.0℃to –20.0℃, heating capacity was found to be similar due to somewhat equal temperature difference between inlet and outlet of inner condenser. However, COP increased until certain EEV opening, especially under 45.0%, because of decreasing power consumption. When the compressor speed was varied from 2,000 to 4,000 RPM, while heating capacity increased, COP decreased by higher refrigerant mass flow rate. In the future works, additional performance characteristics would be analyzed according to stack coolant operating conditions.