Transcritical carbon dioxide electric vehicle thermal management system and frostless control method thereof

Abstract

The invention belongs to the technical field of carbon dioxide systems, and discloses a transcritical carbon dioxide electric vehicle thermal management system and a frostless control method thereof. The system is characterized in that: a port a of a first four-way reversing valve is connected with an outlet of a compressor, a port b is connected with an inlet of a defrosting heat exchanger, an outlet of the defrosting heat exchanger is connected with an inlet of a main heat exchanger through an all-pass throttling valve, a port a of a second four-way heat exchange valve is connected with an outlet of the main heat exchanger, a port c is connected with a port d of a heat regenerator through a two-way throttle valve, a port b is connected with a port c of the heat regenerator, a port d of the second four-way reversing valve is connected with an inlet of an outdoor heat exchanger, an outlet of the outdoor heat exchanger is connected with a port d of the first four-way reversing valve, a port c of the first four-way reversing valve is connected with an inlet of a gas-liquid separator, an outlet of the gas-liquid separator is connected with a port b of the heat regenerator, and a port a of the heat regenerator is connected with an inlet of the compressor. The invention further provides a frostless control method under each working condition. Frostless operation can be achieved, and the heating performance is not prone to being severely attenuated; and the thermal management system is simple in architecture and low in cost.

Description

technical field [0001] The invention belongs to the technical field of transcritical carbon dioxide systems, in particular to a thermal management system of a transcritical carbon dioxide electric vehicle and a frost-free control method thereof. Background technique [0002] The heat pump system is able to recirculate ambient and waste heat back into the heating process, which has the advantages of high efficiency and energy saving. Scientists and scholars have made many efforts to alleviate energy shortages and aggravation of environmental pollution. The gradual maturity of electric vehicle related technologies and the popularization of electric vehicles are one of the representative measures. However, other hidden dangers associated with electric vehicles are gradually being discovered. For example, the heating capacity of the refrigerant in winter is insufficient, and a positive temperature coefficient thermistor (Positive Temperature Coefficient, PTC for short) is usual...

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Problems solved by technology

[0004] The object of the present invention is to provide a transcritical carbon dioxide electric vehicle thermal management system and a frost-free control method thereof to solve the problem of CO 2 As a natural refrigerant, frost on the surface of the evaporator will increase the heat transfer resistance and wind resistance between the refrigerant and the air in the evaporator; as the thickness of the frost layer increases, the heat transfer performance will gradually decrease, resulting in a rapid deterioration of the heating capacity. technical problem

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