What are the effects of pressure and temperature on the refrigeration system of a cold storage?

A fault has occurred in the refrigeration system of the cold storage.

Generally, it is impossible to directly see where the faulty part is located, nor is it possible to disassemble and dissect the components of the refrigeration system. One can only conduct external inspections to find abnormal phenomena during operation and conduct a comprehensive analysis.

During the inspection, the running state of the system is generally understood by looking, listening, and touching. When the operating pressure and temperature of the system exceed the normal range, there must be a problem except when the indoor and outdoor ambient temperatures deteriorate. This is an important basis for judging the source of the fault.

Detection of pressure and temperature in the refrigeration system
The refrigeration system can be divided into two parts, high pressure and low pressure, during operation. The high-pressure section is from the exhaust port of the compressor to before the throttle valve, and this section is called the exhaust pressure. The pressure at the suction port of the compressor is called the suction pressure, and the suction pressure is close to the evaporation pressure.

The influence of changes in suction pressure on the refrigeration system
The suction pressure is closely related to the evaporation temperature and the flow rate of the refrigerant. For a system using an expansion valve, the suction pressure is related to the opening degree of the expansion valve, the refrigerant charge amount, the cooling efficiency of the compressor, and the load size.

The influence of changes in exhaust (condensation) pressure on the refrigeration system
When the refrigeration system is running, its exhaust pressure corresponds to the condensation temperature, and the condensation temperature is related to the flow rate and temperature of its cooling medium, the inflow amount of the refrigerant, the cooling load amount, etc.