In the air-conditioning refrigeration system, the refrigerant line can be divided into two parts, high pressure and low pressure. The temperature of high pressure's refrigerant is higher, which need to cool by condenser. And the low pressure refrigerant which be through the evaporator, need the gas-liquid separator to separate the gaseous and liquid refrigerant. The liquid refrigerant needs the time and temperature to evaporate to the gaseous then be entered the compressor, avoid the liquid compression, to extend the compressor's using life.
The function of the heat exchange is to put the two refrigerant pipelines (high pressure's and low pressure's) through a container, passing each with high and low temperature, so that the refrigerant to be cooled to obtain a low temperature, obtained requires heating the refrigerant temperature, after this heat exchange, the system efficiency will be greatly improved to achieve better cooling effect.