Automotive Air Conditioning System Using Secondary Circuit

Abstract

An automotive air-conditioning system using a secondary circuit, including: a condensing plate heat exchanger, a compressor, an evaporating plate heat exchanger, and a front heat exchanger that are sequentially connected to form a loop, wherein: the condensing plate heat exchanger and the front A first ball valve and a first expansion valve connected in parallel are arranged between the heat exchangers, a second expansion valve is arranged between the evaporating plate heat exchanger and the front heat exchanger, and the front heat exchanger and the compressor are further passed The second ball valve is connected, and the condensing plate heat exchanger and the evaporating plate heat exchanger are respectively connected with the warm core and the cold core. The invention increases the heat exchange area in the refrigeration mode by switching the refrigerant circuit, and effectively enhances the refrigeration performance of the system; The warm cores are connected in series to increase the heat exchange area of ​​the cold cores to improve the cooling efficiency, and the conversion of cooling, heating and defrosting modes is completed through the control of the valve in the brine circuit.

Description

technical field [0001] The invention relates to a technology in the field of automobile air-conditioning, in particular to an automobile air-conditioning system using a secondary circuit. Background technique [0002] With the intensification of the greenhouse effect, the refrigerant R134a used in traditional automotive air-conditioning systems is facing elimination and banning in countries all over the world due to its high global warming potential. The refrigerants R290 and R1234yf with certain flammability are the current substitutes for R134a majority direction. In the automotive air-conditioning system using such flammable refrigerants, in order to ensure safety, the secondary circuit structure is often used, that is, the evaporator plate heat exchanger, the condenser plate heat The heat exchange in the passenger compartment prevents the refrigerant circuit from entering the passenger compartment to reduce the risk of combustion and explosion caused by refrigerant leak...

AI Technical Summary

Problems solved by technology

[0003] In the automotive air-conditioning system of the secondary circuit, the cold or heat generated by the evaporator or the condenser is brought to the cold or warm core in the air-conditioning box through the brine respectively. Due to the limitation of the space structure of the air-conditioning box, the existing automobile The air conditioning system often has insufficient cooling capacity due to the small heat transfer area of ​​the cold core

Images