AIR PURGER

Air enters into a refrigeration system in many ways. The refrigerant supplied by the supplier may not be pure. There is also a chance of air getting inside the system while charging the gas. Air can enter into the system while changing the oil or during maintenance of the plant. Inadequate evacuation during commissioning causes some air to remain in the system. In refrigeration plants where suction pressure is less than atmospheric pressure, air can be sucked inside to the suction side through any small or very condensed and they cause the discharge pressure to increase there by increasing the power consumption and decreasing the refrigeration capacity. The air, if not removed from the system reduces the efficiency of the plant which will increase the running cost with reduced capacity.

Detection of Non-Condensable in the System

Suction and discharge pressure gauges for refrigeration systems always show pressure as well as corresponding saturation temperature at each pressure. The condensed liquid leaving the condenser has the saturation temperature corresponding to the condensing pressure. Measure the condensing temperature by using a thermometer. If the discharge pressure gauge shows a higher temperature than the measured condensing temperature, this is due to the pressure of air in the system. The difference between the condensing pressure corresponding to the measured temperature and the total condensing pressure indicated by the pressure gauge is the partial pressure of the non-condensables.

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