Absorption refrigeration is a form of liquid gasification. Like vapor compression refrigeration, it uses gas refrigerant to vaporize at low temperature and low pressure to achieve refrigeration. The difference is that vapor compression refrigeration relies on the consumption of mechanical work (or electrical energy) to transfer heat from low-temperature objects to high-temperature objects, while absorption refrigeration relies on the consumption of heat to complete this non-spontaneous process.
Principle of refrigeration
Absorption chillers are mainly composed of four exchange devices, namely a generator, a condenser, an evaporator and an absorber, which form two circulation loops: a refrigerant cycle and an absorber cycle. The left half is the refrigerant cycle, which is a reverse cycle and consists of a condenser, a throttling device and an evaporator. The high-pressure gaseous refrigerant is condensed into a liquid state in the condenser after being released to the cooling medium, and then decompressed by a throttling device to enter the evaporator; in the evaporator, the liquid is vaporized into a low-pressure gas state, and at the same time, the cooled medium is sucked. Heat produces a cooling effect. These processes are identical to vapor compression refrigeration. The right half is a positive cycle of the absorbent cycle, which is mainly composed of an absorber, a generator and a solution pump, and is equivalent to a compressor for vapor compression refrigeration.
In the absorber, the liquid absorbent is continuously absorbed by the liquid absorbent to achieve the purpose of maintaining the low pressure in the evaporator; the refrigerant-absorbent solution formed by the absorption of the refrigerant vapor by the absorbent is pumped up by the solution. After pressing, the generator enters the generator; in the generator, the solution is heated and boiled, wherein the refrigerant having a low boiling point is vaporized to form a high-pressure gaseous refrigerant, which is liquefied into the condenser, and the remaining absorbent solution is returned to the absorber to absorb the low pressure again. Gaseous refrigerant.
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