Vapor Absorption Vs Vapor Compression Refrigeration

There are some aspects in which vapor absorption refrigeration system is different from that of vapor compression. The main principle is the same for the two systems. But there are differences between power consumption COP, mechanical parts etc.

Difference between vapor compression and vapor absorption refrigeration systems

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Comparison between vapor absorption and vapor compression refrigeration systems

seznamování psáry Aspect Vapor Absorption System Vapor Compression System
1 Quality of the Energy Input Low grade energy sources are more than capable of running a vapor absorption system. These sources can be waste heat from furnaces, exhaust steam etc. Solar power can also be used for running it. Vapor compression system needs high grade energy. It needs electrical or mechanical energy for operating compressor which is an essential part of VC refrigeration system.
2 Moving part in the system The only moving part of Vapor absorption refrigeration system is the pump. In Vapor compression the moving part is the compressor which operated by electric motor or engine .
3 Effect of Evaporator pressure Very little effect is seen in the refrigeration capacity with the lowering evaporator pressure. The refrigerating effect or refrigeration capacity decreases with the lowering evaporator pressure.
4 Workability at Load varying load Load Variation does not have any effect on the performance of the vapor absorption system Vapor compression system does not work well at partial load. The performance is very poor.
5 Evaporator exit In vapor absorption system, if the liquid refrigerant leaves the evaporator, the refrigerating effect is reduced but the system functions well without any problem. Liquid refrigerant entering compressor is not desirable in Vapor compression system. It could damage the compressor. So the refrigerant is superheated before leaving the evaporator.
6 Lowest temperature When water is used as refrigeration the temperature attained is above 0 degree Celsius -150 degree Celsius or even lower can be achieved with the cascading system.
7 Coefficient of Performance The COP of absorption refrigeration system is poor. The COP of Vapor compression system is very good.
8 Capacity Capacity above 1000 TR is easily achievable. It is difficult to capacity above 1000 TR with single compression system.
9 Refrigerant Ammonia or water can be used as refrigerant with a proper absorber. Hydrocarbons, Chlorofluorocarbons and Hydrochlorofluorocarbons are used as refrigerations.


Basic Mechanical Engineering is a small endeavor for the mechanical engineering students and fresh graduates. All the articles are written by mechanical "rocking" engineers \m/

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