Electric vehicle heat pump air conditioner for defrosting by using heat storage device and defrosting method

Abstract

The invention discloses an electric vehicle heat pump air conditioner for defrosting by using a heat storage device. The electric vehicle heat pump air conditioner comprises a heat pump loop and a heat storage loop; the heat pump loop is mainly composed of an electric compressor, a four-way valve, an in-vehicle heat exchanger, a double-way expansion valve and an out-vehicle heat exchanger; the heat storage loop is mainly composed of a heat storage heat exchanger, a first solenoid valve, the heat storage device, a second solenoid valve and a water pump. The invention further discloses a defrosting method of the electric vehicle heat pump air conditioner for defrosting by using the heat storage device. According to the electric vehicle heat pump air conditioner, the heat pump loop is added,partial heat in a heating mode is stored in the heat storage device, heat stored in a heat storage working medium is used for heating an indoor heat exchanger in a defrosting mode, and the evaporationtemperature is increased; the comfort degree in a vehicle can be increased, formation of condensate water is avoided, hidden dangers of atomization of the condensate water are eliminated, safety driving of the vehicle is guaranteed, the air suction temperature of the electric compressor can also be increased, then the condensation temperature of an outdoor heat exchanger is increased, and the defrosting time is shortened.

Description

technical field [0001] The invention relates to a heat storage device for defrosting a heat pump type air conditioner of an electric vehicle, in particular to a heat storage device using the heat of the heat storage medium in the heat storage device to increase the temperature of the heat exchanger in the car in the defrosting mode, so as to avoid heat exchange in the car A heat storage device that forms condensed water in the evaporator and improves the defrosting performance of the electric vehicle air conditioner. Background technique [0002] In winter, pure electric vehicles do not have the engine to provide waste heat for heating, so the automotive air conditioning system is required not only to have the cooling function in summer, but also to undertake heating in winter. At present, pure electric vehicles mainly use electric heating auxiliary air-conditioning system for winter heating, and its maximum heating COP is 1. Therefore, when the air conditioner is running in...

AI Technical Summary

Problems solved by technology

However, due to the low heating efficiency of the heat pump air conditioner in a low temperature environment and the external heat exchanger in the heating mode is prone to frost, the air conditioner needs to be switched from the heating mode to the defrosting mode to defrost in time

During defrosting, the interior of the car will stop heating, the temperature inside the car will drop and condensed water will be produced, and the comfort inside the car will deteriorate

When the system switches back to heating mode from defrosting mode, the condensed water on the heat exchanger in the air duct will evaporate rapidly and atomize on the windshield, causing certain dangers to driving. Therefore, the application of traditional heat pump air conditioning systems is often restricted

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