Secondary loop air conditioning heat pump system and method thereof

Abstract

The invention designs a secondary loop air conditioning heat pump system and a method thereof. The system comprises a refrigerant loop, a cold end liquid coolant loop and a hot end liquid coolant loop. The refrigerant loop comprises an electric compressor, a plate condenser, a throttle device and a plate evaporator. The cold end liquid coolant loop is connected to the plate evaporator, and the endof the evaporator transfers cold to liquid coolant, the liquid coolant is conveyed to a cooler in the room through a pump to realize the cooling mode, at this time, heat of the end of the condenser is discharged to the outdoor through an outdoor radiator, the hot end liquid coolant loop is connected to the plate condenser, the end of the condenser transfers heat to the liquid coolant, the liquidcoolant is conveyed to an indoor heater through a pump to realize the heating mode, at this time, the cold quantity of the end of the evaporator is discharged to the outdoor through the outdoor radiator, at the same time, the dehumidification function can be fulfilled by switching the liquid coolant loops. The secondary loop air conditioning heat pump system can effectively avoid the contact between a refrigerant and a passenger compartment, can control the temperature of a battery pack of the electric vehicle, and can recycle excess heat.

Description

technical field [0001] The invention belongs to an electric vehicle air-conditioning system, and in particular relates to an electric vehicle secondary circuit air-conditioning heat pump system and a method thereof which can use flammable refrigerants. Background technique [0002] Considering global warming and carbon dioxide emissions, motor vehicle emission regulations are becoming increasingly stringent, and new energy electric vehicles have become an inevitable trend. As the greenhouse effect is becoming more and more serious, the replacement of new refrigerants with ODP≤150 has become the focus of common attention in new energy vehicle air conditioners. Table 1 below is a comparison of potential refrigerants. It can be seen that, except for carbon dioxide, which is not flammable, all other refrigerants have different degrees of flammability. At present, due to the high pressure of carbon dioxide, there will be serious leakage problems in the air-conditioning system d...

AI Technical Summary

Problems solved by technology

If the refrigerant is a flammable refrigerant, once the refrigerant in the air-conditioning box comes into direct contact with

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