Advantages of vapour compression refrigeration system
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1) Method of compression of the refrigerant: One of the most important parts of any refrigeration cycle is the compression of the refrigerant since all the further operations depend on it. In the vapor compression refrigeration system the compression of the refrigerant is done by compressor which can be of reciprocating, rotating or centrifugal type. In the vapor absorption refrigeration system, the compression of the refrigerant is done by absorption of the refrigerant by the absorbent. As the refrigerant is absorbed, it gets converted from the vapor state to liquid state so its volume reduces.
2) Power consumption devices: In the vapor compression cycle the compressor is the major power consuming device while in the vapor absorption cycle the pump used for pumping refrigerant-absorbent solution is the major power consuming device.
3) The amount of power required: The compressor of the vapor compression cycle requires large quantities of power for its operation and it increases as the size of the refrigeration system increases. In case of the vapor absorption refrigeration system, the pump requires very small amount of power and it remains almost the same (or may increase slightly) even for higher capacities of refrigeration. Thus the power consumed by the vapor absorption refrigeration system is much more than that required by the vapor compression system.
4) Type of energy required: The vapor absorption system runs mainly on the waste or the extra heat in the plant. Thus one can utilize the extra steam from the boiler, or generate extra steam for the purpose and also use the hot available water. Similarly the waste heat from the diesel engine, hot water from the solar water heater, etc. can also be utilized. In case of the vapor compression refrigeration system, the compressor can be run by electric power supply only; no other types of energy can be utilized in these systems.
5) Running cost: The vapor compression refrigeration system can run only on electric power, and they require large amount of power. These days the electric power has become very expensive, hence the running cost of the vapor compression refrigeration system is very high. In case of the absorption refrigeration system only small pump requires electric power and it is quite low. In most of the process industries, where the absorption refrigeration is used, there is some extra steam available from the boiler, which can be used for running the system. Thus in absorption refrigeration system no extra power in the pure electric form is required and the energy that would have otherwise gone wasted is utilized in the plant. Thus the running cost of the absorption refrigeration system is much lesser than the vapor compression system.
2) Power consumption devices: In the vapor compression cycle the compressor is the major power consuming device while in the vapor absorption cycle the pump used for pumping refrigerant-absorbent solution is the major power consuming device.
3) The amount of power required: The compressor of the vapor compression cycle requires large quantities of power for its operation and it increases as the size of the refrigeration system increases. In case of the vapor absorption refrigeration system, the pump requires very small amount of power and it remains almost the same (or may increase slightly) even for higher capacities of refrigeration. Thus the power consumed by the vapor absorption refrigeration system is much more than that required by the vapor compression system.
4) Type of energy required: The vapor absorption system runs mainly on the waste or the extra heat in the plant. Thus one can utilize the extra steam from the boiler, or generate extra steam for the purpose and also use the hot available water. Similarly the waste heat from the diesel engine, hot water from the solar water heater, etc. can also be utilized. In case of the vapor compression refrigeration system, the compressor can be run by electric power supply only; no other types of energy can be utilized in these systems.
5) Running cost: The vapor compression refrigeration system can run only on electric power, and they require large amount of power. These days the electric power has become very expensive, hence the running cost of the vapor compression refrigeration system is very high. In case of the absorption refrigeration system only small pump requires electric power and it is quite low. In most of the process industries, where the absorption refrigeration is used, there is some extra steam available from the boiler, which can be used for running the system. Thus in absorption refrigeration system no extra power in the pure electric form is required and the energy that would have otherwise gone wasted is utilized in the plant. Thus the running cost of the absorption refrigeration system is much lesser than the vapor compression system.
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The advantages of vapor compression refrigerator are its (1) capability of removing large quantities of heat with a small mass flow of refrigerant, (2) high efficiency, arguably one of the most efficient refrigeration systems at the macroscale, producing high COP, and (3) the capability of achieving subambient
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