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Hazards and Elimination Methods of Inlet Air in REFRIGERATION UNIT Refrigeration System





REFRIGERATION UNIT In the refrigeration system, the so-called non-condensable gas means that when the refrigeration system is working, at a specific temperature and pressure in the condenser, the gas cannot be condensed into a liquid, but always in a gas state. These gases mainly include nitrogen. , oxygen, hydrogen, carbon dioxide, hydrocarbon gases, inert gases and mixtures of these gases, etc.

Due to the existence of non-condensable gas, the energy consumption of the compressor is increased, while the cooling capacity of the REFRIGERATION UNIT is reduced.

During the flow, the high-pressure refrigerant liquid exchanges heat with the mixed gas in the second and fourth layers when passing through the first and third layers, and the refrigerant liquid evaporates into refrigerant gas, while the refrigeration in the mixed gas The refrigerant gas is condensed into liquid; the non-condensable gas is accumulated in the second and fourth layers of casing. When the accumulation is sufficient, the open valve is opened to release the non-condensable gas, and the liquid refrigerant flows into the pipe through the throttle valve and evaporates.
Condenser bleed valve bleed
Step 1: Close the liquid outlet valve of the accumulator.
Step 2: Turn on the compressor, and press the refrigerant (and non-condensable gas) in the system into the condenser until the low-voltage relay operates and stops.
Step 3: After stopping, let the cooling water continue to circulate in the condenser to fully condense the refrigerant. Because the non-condensable gas is lighter than the refrigerant gas, it accumulates at the top of the condenser (in some small units the condenser is at the bottom of the compressor, and at this time it accumulates in the highest position in the high-pressure system).
Step 4: Open the air release valve on the top of the condenser (or the multi-purpose channel of the double-seat exhaust stop valve or the connector of the exhaust temperature gauge socket) to release the non-condensable gas. The opening of the air release valve should not be too large. In order to judge the situation of deflation, you can use your hand to face the air flow. If it feels like the wind blowing, it means that the gas is released; if there is oil on the hand and a cool feeling, it means that the refrigerant gas has been released. The bleed valve should be closed immediately.

The method of REFRIGERATION UNIT to automatically remove non-condensable gas is to control the discharge of non-condensable gas according to parameters such as temperature, and at the same time, the refrigerant recovery device recovers the refrigerant in the mixed gas as much as possible, leaving the non-condensable gas. Drain the system.


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