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When the ordinary heat pump air conditioning system of a pure electric   vehicle runs at ultra-low temperature, the discharge temperature of   compressor will be too high and the heating capacity of the system will decay   seriously, it will lead to inactivity of the heating system. In order to   solve this problem, a modification is put forward, and an experiment is also   designed. The experimental results show that in the same conditions, this new   heating system increases more than 20% of the heating capacity; when the   outside environment temperature is negative 20 degrees, the discharge   temperature of compressor is below 60 degrees

Heat pump air conditioning system for pure electric vehicle at ultra-low temperature