Detection and handling of non-condensable gases in propane refrigeration systems

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1. When it is suspected that there are non-condensable gases in the equipment, shut down the machine and supply water to the condenser. When the cooling water temperature remains constant and the inlet and outlet temperatures are the same, after 1 hour of stabilization, if the condensation pressure is 0.05 MPa or more higher than the refrigerant’s saturated pressure corresponding to that cooling water temperature, it can be determined that there are non-condensable gases present in the equipment. 2. Open the condenser vent valve, and the condensation pressure gradually decreases. When the difference between the condensation pressure and the refrigerant saturation pressure corresponding to the cooling water temperature is less than 0.05 MPa, close the vent valve. Let it stand for 30 minutes and observe the pressure changes. If the condensation pressure is still 0.05 MPa or more higher than the refrigerant saturation pressure corresponding to the cooling water temperature, repeat the above steps.