How to operate the refrigeration system in the high and low temperature alternating damp heat test chamber?

How to operate the refrigeration system in the high and low temperature alternating damp heat test chamber?

Reminder: Gas is not condensed gas. Besides, gas is not easy to condense into liquid under normal ultra-low temperature. If gas penetrates into the refrigeration system, it will endanger the heat dissipation of the heat pipe of the cooler and cause

Gas is not condensed gas. In addition, gas is not easy to condense into liquid under normal ultra-low temperature. If gas penetrates into the refrigeration system, it will endanger the heat dissipation of the heat pipe of the cooler, increase the working pressure of the condenser, and cause the generator set to not operate normally. Therefore, the air in the refrigeration system must be discharged to maintain the normal operation of the generator set.

Freon system software air release operation process

Turn off the liquid reservoir outlet valve or the cooler outlet valve.

Start the refrigeration compressor to take the refrigerant in the bottom pressure section into the cooler or accumulator.

After the bottom pressure system software gas pressure reaches a stable vacuum pump condition, shut down.

Loosen the side-buried oil plug of the exhaust pipe stop valve, and turn the valve stem of the exhaust pipe clockwise (half a turn up and down) to make the valve F-shaped, so that the high-pressure steam can escape from the side-buried hole. Use your hand to block the exhausting cyclone. When your hand feels cold and there are oil stains in your hand, it indicates that the gas has been completely drained. The oil plug should be tightened, the automatic exhaust valve stem should be reversed, and the side buried hole should be closed.

common problem:

â‘  It is not suitable for a long time to discharge the air each time, and it can be carried out continuously for 2 to 3 times to prevent extravagant waste of refrigerant.

â‘¡If the top of the cooler or accumulator is equipped with a reserved shut-off valve, the air can also be released from the gate valve immediately.

The actual operation steps of air release of ammonia refrigeration system

When using gas separation equipment to release air, place the return valve of the gas separation equipment in a normally open condition to bring the gas pressure of the gas separation equipment to the breathing working pressure. All other valves should be closed.

Appropriately open the mixed gas bypass valve to allow the mixed gas in the refrigeration system to enter the gas separation equipment.

Slightly open the liquid supply valve (the size of the opening degree should be determined by the frosting condition of the respiratory tract, generally operated to make the respiratory tract frost up and down 1 m), so that the ammonia throttle valve enters the gas separation equipment to vaporize and endothermic reaction , Water cooling mixed gas.

Connect the vulcanized rubber hose used for the air valve socket, so that one end is inserted into the water in the water container. When the ammonia in the mixed gas is cooled by water into ammonia liquid, the bottom of the gas separation equipment will be frosted. At this time, the air valve can be slightly opened to discharge the gas according to the water container. If the bubble is round in the whole process of rising in the water, there is no volume change, the water is not turbid, and the temperature does not rise, then the gas is released. At this time, the tubing pressure of the air release valve should be suitable. If the volume of the vapor bubble gradually decreases during the whole process of rising, the water becomes milky white and turbid, and the temperature rises, it indicates that the released vapor contains more nitrogen dioxide, indicating that the gas has been exhausted. , The actual operation of venting should be terminated.

The ammonia in the mixed gas is slowly turned into ammonia liquid by the condenser, and is stored at the bottom. The aspect ratio of the liquid level gauge can be seen from the frosting condition of the shell. When the liquid level gauge reaches 1/2, close the liquid supply throttle valve, close the liquid supply overflow valve, and open the liquid collection overflow valve. . The layered ammonia liquid flows back to the gas separator, and water cools the mixed gas. After the frost layer is about to melt (indicating that the ammonia in the condenser is about to be drained), close the liquid collection overflow valve and open the liquid supply overflow valve.

When terminating the air release, first close the air release valve to prevent nitrogen dioxide from leaking out, and then close the liquid supply overflow valve and the mixed gas bypass valve. In order to avoid the high working pressure in the air release device, the air valve must not be turned off.