Answer: After being compressed, the low-temperature and low-pressure gaseous refrigerant becomes a high-temperature and high-pressure superheated refrigerant vapor, which enters the condenser through the pipeline, cools and condenses into a high-pressure liquid refrigerant. The pressure at this time is called the condensation pressure, commonly known as "high pressure".
The high-pressure liquid refrigerant enters the evaporator through the expansion valve, and then absorbs the heat of the compressed air during the evaporation process and becomes a gaseous refrigerant, returning to the compressor inlet. The pressure at this time is called the "evaporation pressure", commonly known as "low pressure". The pressure measuring point of the cold dryer evaporation pressure is generally installed on the evaporator.
