Indirect low-temperature heat pump system

Abstract

An indirect type low-temperature heat pump system comprises an electric compressor, a high-pressure refrigerant cooling liquid heat exchanger, a dry liquid storage tank and a low-pressure refrigerantcooling liquid heat exchanger which are sequentially connected to form a refrigerant loop, the refrigerant loop and the cooling liquid loop are completely independent, the high-pressure refrigerant cooling liquid heat exchanger and the indoor heater form a high-temperature cooling liquid loop, and the low-pressure refrigerant cooling liquid heat exchanger, the first expansion kettle, the driving motor, the heat dissipation water tank and the heating water PTC used for increasing the temperature of the low-temperature heat source to form a low-temperature cooling liquid loop. According to the invention, the refrigerant loop design is simplified through compression, the refrigerant leakage risk is reduced, the refrigerant filling amount is reduced, and the safety of the R290 heat pump air conditioner is improved; the automobile air conditioner has the functions of refrigeration, heating, demisting and defrosting of a passenger compartment of a new energy automobile, and can still normally operate a heat pump for heating in a low-temperature environment through the air supplementing compressor and the heating water PTC.

Description

technical field [0001] The invention relates to a technology in the field of heat pump air conditioners, in particular to an indirect low-temperature heat pump system using propane (R290). Background technique [0002] Existing automotive air-conditioning systems rely on the air-conditioning system for refrigeration, and rely on the engine coolant to dissipate heat for heating. However, in new energy electric vehicles, the vehicle-mounted heat pump system or high-voltage electric heating PTC is usually used to solve this problem. However, the efficiency of electric heating PTC is always less than 1. The battery consumes a lot of energy, which greatly reduces the cruising range of the vehicle. [0003] R290 has become a popular alternative refrigerant for automotive air conditioners due to its low GWP value, high latent heat of vaporization, high evaporation pressure, and low price. It has many limitations in practical promotion and application. Especially for new energy ve...

AI Technical Summary

Problems solved by technology

[0002]The existing automotive air-conditioning system relies on the air-conditioning system for cooling, and the engine coolant for heating to dissipate heat. Heating the PTC to solve this problem, however, the efficiency of the electric heating PTC is always less than 1, which consumes a lot of battery energy and greatly reduces the cruising range of the vehicle

[0003]R290 has become a popular alternative refrigerant for automotive air conditioners due to its low GWP value, high latent heat of vaporization, high evaporation pressure and low price. Flammability, and regulations restricting the amount of flammable refrigerant charges make it have many limitations in practical application

Especially for new energy vehicle heat pump air conditioners with multiple heat exchangers, refrigeration, heating, defogging, defrosting, multi-functional features, and complex pipelines, the risk of leakage of R290 increases, and the charging amount increases, which intensifies the risk of R290. application limitations

[0004]In addition, due to the limitations of low evaporation pressure and high compression ratio of the compressor in the current new energy vehicle heat pump air conditioner, it usually only operates at an ambient temperature above -10°C, which poses a huge Exacerbating the impact of the ambient temperature below -10°C on the cruising range of the vehicle by the heating of the compartment

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