Vapour Absorption Cycle
Vapour Absorption Cycle:-
The Vapour Compression Cycle has been a most commonly used cycle for refrigeration in HVAC system.It provide efficiency, reliability, practically demanded by users.The Absorption system has found it's niche where there is large quantity of inexpensive or waste heat available.
Changing economics and fuel availability have influenced the selection of these types of system.These system have the ability to furnish heating and cooling simultaneously.
The environmental concerns with many of the halocarbon refrigerant have drawn more attention to absorption system,since the commonly used working fluids of these systems have a benign effect on atmosphere.
Above image illustrates tha essential features of the absorption cycle.Note that the compressor of the vapour Compression Cycle has been replaced by the generator, absorber, and pump and that the solution of refrigerant and absorbent circulates through the elements.
Refrigerant alone flows through the condenser,expansion valve and evaporator.Heat is transferred to the solution in the generator, and the refrigerant vapour separated from the solution, whereas the opposite process occurs in the absorber.
The ease with which these processes may be carried out in the practice depend on the refrigerant-absorbent pair ana many refinements to the cycle required in actual practice. These factors will be discussed later.
the overall performance of the absorption cycle in terms of refrigerating effect per unit of energy input is generally poor; however, waste heat such as that rejected from a power plant can often be used to achieve better overall energy conservation.
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