How Does An Air Dryer Work?

The low pressure (low temperature) refrigerant in the evaporator is sucked into the compressor cylinder by the refrigeration compressor. The refrigerant steam is compressed, and the pressure and temperature are increased at the same time. The high pressure and high temperature refrigerant steam is pressed to the condenser, in the condenser, the high temperature refrigerant steam and the low temperature of the cooling water or air for heat exchange, the heat of the refrigerant is taken away by the water or air and condensed down, the refrigerant steam becomes a liquid. This part of the liquid is transported to the expansion valve.

Through the expansion valve throttled into low temperature and low pressure liquid and into the evaporator; In the evaporator, the low temperature and low pressure refrigerant liquid absorbs the heat of the compressed air and vaporizes (commonly known as "evaporation"), and the compressed air is cooled to condense a large amount of liquid water; The refrigerant steam in the evaporator is absorbed by the compressor, so that the refrigerant is compressed, condensed, throttled and evaporated in the system, thus completing a cycle.

In the refrigeration system of the freeze dryer, the evaporator is the equipment that transports the cold quantity, and the refrigerant absorbs the heat of the compressed air in it to realize the purpose of dehydration and drying. The compressor is the heart, which plays the role of suction, compression and delivery of refrigerant steam. 

The condenser is a device that emits heat and transfers the heat absorbed in the evaporator together with the heat transformed by the input power of the compressor to the cooling medium (such as water or air) to take away. The expansion valve/throttle valve plays the role of throttling and reducing the pressure of the refrigerant, and simultaneously controls and regulates the amount of refrigerant liquid flowing into the evaporator, and divides the system into two parts: the high pressure side and the low pressure side.