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The effect of commercial refrigeration vacuum leak test
The effect of commercial refrigeration vacuum leak test
Vacuum leak test is performed after the pressure leak test is completed. There are two purposes of the vacuum leak test, one is to check the tightness of the commercial refrigeration system under vacuum conditions, and the other is to remove the residual gas and moisture in the system.
Non-condensable air or nitrogen will not condense into liquid at room temperature or low temperature. This part of the non-condensable gas exists in the condenser and occupies part of the volume, which affects the heat dissipation capacity of the condenser, increases the condensation pressure, and affects the normal refrigeration effect. Therefore, the non-condensable gas in the system must be removed. Exhausted. According to relevant regulations, during the vacuum test, the pressure in the Freon system should drop below 5.33MPa (that is, the vacuum degree should be above 96.0kPa), and the pressure rise within 8 hours should not exceed 1.33kPa. The requirements for the degree of vacuum should also vary with the atmospheric pressure of different places. Generally speaking, multiplying the coefficient of 0.96 by the atmospheric pressure of the local day is the degree of vacuum required. When performing vacuum leak testing, a vacuum pump should be used to vacuum. For small refrigeration systems or in the absence of a vacuum pump, the refrigeration compressor itself can also be used to vacuum. The commercial refrigeration refrigeration system composed of hermetic compressors cannot be vacuumed with its own compressor, so it is necessary to connect a vacuum pump to complete this work. For refrigeration systems composed of larger compressors or semi-hermetic compressors, it is generally not suitable to use their own compressors to vacuum. Because the large-bore compressor uses its own vacuum to be dangerous (because the exhaust port is small), when the semi-hermetic compressor uses its own vacuum, the motor cooling condition is poor.
Refrigerant charge leak test After the pressure and vacuum leak test is completed, the charge refrigerant leak test can be performed. The purpose of leak detection with refrigerant is to further check the tightness of the system, because the refrigerant has strong permeability, if there is a leak in the system, a large amount of charged refrigerant will leak and lose. When filling Freon for leak detection, a small amount of Freon gas can be filled into the system to make the pressure in the system reach 0.2-0.3MPa, and then the leak detection can be started. Freon leak detection can use halogen lamp or halogen leak detector.
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