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When the refrigeration system fails, it is generally not possible to directly see where the fault occurs, nor is it possible to decompose and dissect the components of the refrigeration system one by one, only from the appearance of inspection, to find out the abnormal phenomenon in operation, for comprehensive analysis.

In the inspection, we generally understand the operating status of the system by looking, listening and touching. When the operating pressure and temperature of the system exceed the normal range, in addition to the deterioration of the indoor and outdoor ambient temperature, there must be problems, which is an important basis for judging the root cause of the fault.

First, the refrigeration system pressure and temperature detection

(1) Pressure concept of refrigeration system

The refrigeration system can be divided into two parts: high and low pressure. High pressure section from the compressor exhaust port to the throttle valve, this section is called high pressure pressure; The suction pressure of the compressor is called the suction pressure, the suction pressure is close to the evaporation pressure, the difference between the two is the flow resistance of the pipeline; The pressure loss is generally limited to less than 0.018Mpa. The evaporation pressure and condensing pressure of the refrigeration system are detected at the suction and exhaust ports of the compressor. It is usually called the suction and exhaust pressure of the compressor.

The purpose of detecting the suction and exhaust pressure of the refrigeration system is to obtain the evaporation temperature and condensation temperature of the refrigeration system, so as to obtain the operating status of the refrigeration system.

(2) The concept of temperature in the refrigeration system

Temperature concept: The temperature in the refrigeration system involves a wide range of areas, including evaporation temperature te, suction temperature ts, condensing temperature, exhaust temperature, etc. The evaporation temperature te and condensing temperature tc play a decisive role in the operating conditions of the refrigeration system.

Evaporation temperature te: The evaporation temperature te refers to the temperature at which the liquid refrigerant boils and vaporizes in the evaporator.

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