Difference between vapour compression system and vapour absorption system

Vapour compression system	Vapour absorption system
The system has a main parts like Compressor, condenser receiver, refrigerant control device and evaporator	The system has a main parts like generator, rectifier, condenser absorber and evaporator
The system is noisy in operation	The system is quiet in operation
The system has so many moving parts, so there is a possibility of wear and tear	The system has no moving parts and no possibility of wear and tear or sticking.
Energy supplied is mechanical	Energy input is mainly heat
Generally steel, copper tube is used to connect the parts	Steel tube is used to connect the parts
To reduce the high pressure control devices like expansion valve, front valve, capacity tube are used	To reduce the pressure hydrogen gas is provided
The flow of gas depends upon the compressor	The flow of gas depends upon the gravity and working of the generator
This system is required to operate by prime movers like electric motor, diesel or petrol engine	This system is required to operate by heat energy like gas kerosene or electric heater.
This system is more efficient and occupies more space	This system is poor efficient
Charging of refrigerant is quite simple	Charging of refrigerant to the system is difficult
Energy supply is low	Energy supply is high