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Refrigeration system: The refrigeration system is one of the key parts of the constant temperature and humidity test chamber http://. It can also be called the internal organs of the constant temperature and humidity test chamber. Generally speaking, the cooling mode of the constant temperature and humidity test chamber is mechanical refrigeration and auxiliary liquid nitrogen refrigeration, mechanical refrigeration adopts vapor compression refrigeration, and the refrigeration system (mechanical refrigeration) of Huatian constant temperature and humidity chamber is mainly compressed by two French Taikang. Multi-stage refrigeration consisting of a unit, Taiwan Zhongli condenser, Taiwan Zhongli evaporator, American Sporlan refrigeration solenoid valve, and throttle mechanism. Work principle of the constant temperature and humidity test chamber cascade refrigeration system: two French Taikang compressors, one is auxiliary refrigeration; one is main refrigeration.
First, the auxiliary refrigeration compressor is described. The compressed gas directly enters the condenser to reach the normal temperature state, and then is dried and filtered and then divided into two (A, B) respectively controlled by two American Sporlan refrigeration solenoid valves. A further divides two capillaries (C, D), C enters the evaporator to the constant temperature and humidity test chamber http://laboratory cooling, D cools the reflux pipeline. B cooling heat exchanger in order to create better cooling conditions for the main refrigeration compressor, thus achieving a power-saving, high-efficiency cooling effect. Finally, the check valve is controlled to recover the compressor.
The main compressor is a driven fluid that raises the low pressure gas to a high pressure. It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it by running the motor, and then discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle, thereby achieving compression→condensation→expansion→ Evaporation (endothermic) refrigeration cycle. Huadian Instrument's constant temperature and humidity test chambers use the US "DUPONT" ​​environmentally friendly refrigerant R404A, R23; its ozone loss coefficient ODP is 0.