Electric vehicles don’t have enough waste heat for heating in winter

so the introduction of heat pump system to electric vehicles is of great significance. Two kinds of heat pump system with three heat exchangers and four-way valve are researched in the article

and the result shows that: in most conditions

the two systems’ ability are similar

the difference between them is only 10W to 50W

but the COP of four-way valve system is 15% ~ 18% higher than that of three heat exchanger system

and the compressor power of four-way valve system is 50 to 150W lower than that of three heat exchanger system.