The refrigeration cycle system of the cryogenic constant temperature and humidity chamber is a closed system formed by a refrigeration compressor, a condenser, a drying filter, a capillary tube and an evaporator through a copper tube. The system is filled with a certain amount of refrigerant, which under the action of the compressor, converts the low-pressure low-temperature gaseous refrigerant absorbed by the evaporator into a high-temperature high-pressure gaseous refrigerant, and enters the condenser to be cooled and liquefied to form a refrigerant. Continuously circulate in the low temperature constant temperature and humidity chamber refrigeration system to achieve the purpose of refrigeration.
In the refrigeration system, the refrigerant contains various foreign substances such as moisture, non-condensable gas, frozen oil, metal shavings, grease, fiber, dust, etc., which have a great influence on the refrigeration equipment. Therefore, everyone must know the bad phenomena and methods of elimination caused by the presence of foreign matter.
First, the impact of non-condensing gas
Most of the non-condensable gas in the refrigeration system is generated by air intrusion and gas decomposed at high temperature. Due to the presence of non-condensable gas in the system, the condensing pressure is increased, the exhaust gas temperature is increased, and the refrigeration is reduced. The ability to increase the power consumption, especially when using ammonia as the refrigerant, often causes an explosion due to the presence of non-condensable gas, so always pay attention to the venting of the non-condensable gas in the system. Air is generally released through an air separator. When there is no such equipment, after the compressor is stopped, water is supplied to the condenser, the ammonia gas in the condenser is condensed into a liquid, and the non-condensed gas is collected above the apparatus and can be discharged through the vent valve.
Measures to prevent non-condensed gases from entering the system
1. Before charging the refrigerant, the system should reach a high vacuum;
2. After the equipment is disassembled and installed, vacuuming should be carried out;
3. The exhaust temperature should not exceed 1500 °C;
4. The system is strictly protected against leakage.
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