Working principle of freeze dryer
The amount of water vapor in the compressed air depends on the temperature of the compressed air: while keeping the compressed air pressure basically unchanged, reducing the temperature of the compressed air can reduce the water vapor content in the compressed air, and the excess water vapor will condense into a liquid. Freeze dryers use this principle to use refrigeration technology to dry compressed air. Therefore, the clothes dryer has a refrigeration system. Gree freeze dryer principle front view
The refrigeration system of the freeze dryer is compression refrigeration, which consists of four basic components, such as refrigeration compressor, condenser, evaporator and expansion valve. They are connected by pipes to form a closed system. The refrigerant circulates continuously in the system, changes its state and exchanges heat with the compressed air and cooling medium.
The refrigeration compressor draws the low-pressure (low temperature) refrigerant in the evaporator into the compressor cylinder. The refrigerant vapor is compressed, and the pressure and temperature rise simultaneously. The high-pressure and high-temperature refrigerant vapor is pressed onto the condenser. In the condenser, high-temperature refrigerant vapor exchanges heat with low-temperature cooling water or air.
The heat of the refrigerant is taken away by water or air and condenses. The refrigerant vapor becomes liquid. This part of the liquid is sent to the expansion valve, and the expansion valve throttles it into a low-temperature and low-pressure liquid and enters the evaporator. The low-temperature and low-pressure refrigerant liquid in the evaporator absorbs the heat of the compressed air and evaporates (commonly called "evaporation").
After the compressed air cools, a large amount of liquid water condenses. The refrigerant vapor in the evaporator is sucked away by the compressor, and the refrigerant goes through the four processes of compression, condensation, throttling and evaporation in the system, thus completing a cycle.
In the refrigeration system of a freeze dryer, the evaporator is a device that transmits cold energy, in which the refrigerant absorbs the heat of the compressed air to achieve the purpose of dehydration and drying. The compressor is the heart, playing the role of inhaling, compressing and transporting refrigerant vapor.
The condenser is a device that releases heat, which transfers the heat absorbed in the evaporator and the heat converted by the input power of the compressor to a cooling medium (such as water or air) to be taken away. The expansion valve/throttle valve has throttling and decompression effects on the refrigerant, and at the same time controls and regulates the amount of refrigerant liquid flowing into the evaporator, and divides the system into two parts, a high-pressure side and a low-pressure side. Pressure side.
1.Stainless steel is polished with excellent brand to ensure surface roughness to ensure sterility requirements
2.Cabinet, board level,and hose are tested after multiple procedures to ensure without leakage
3.Screw compressor is used Blitzer refrigeration compressor, more stable performance, reliable, easy to maintain
4.Temperature and pressure of compressor has multiple protection features
5.Suction filter settings, prevent degeneration of stolen goods and acid materials into the compressor chamber , corrosion internal parts and refrigeration oil.
6.Exhaust temperature protection set to avoid oil degeneration in extreme conditions , to reduce the exhaust temperature by cooling motor
7.Compliance with the Montreal Convention, with environmentally friendly refrigerants;
SED-50DG Vacuum Freeze Dryer
Cooling water Quantity
Defrost water Quantity