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Performance Analysis of a Hot Water Driven 5 Tons Capacity Absorption Refrigeration System for Nigerian Application

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Document pages: 8 pages

Abstract: Refrigeration by mechanical vapour compression system is an efficient method. However, the energy input is the shaft work, which is high-grade energy and, therefore, very expensive. And the work required is relatively large because of compression of the vapour which undergoes tremendous changes in specific volume. In order to achieve the raising of the refrigerant pressure from evaporator pressure to condenser pressure (without much altering its volume), the refrigerant vapour is dissolved in an inert liquid at the same pressure as the evaporator; and the solution so formed is pumped to a container, at condenser pressure. Thus, liquid which is practically incompressible and undergoes practically no change in specific volume, requires very little work for raising its pressure. Of all the absorbent-refrigerant pair available, the LiBr-H2O combination is the most preferred because, among other reasons, it is environmentally benign. In this paper, a hot water driven, single stage, absorption cooling system, using a lithium bromide water solution, is analyzed. Four basic stages in the absorption cycle are generation, condensation, evaporation and absorption with ideally no moving part. A configuration of these four stages, having 5 Tons cooling capacity is determined and examined. The pressure parameter is varied in condenser and evaporator. Increasing the pressure of evaporator increases the COP; whereas, the COP is decreased by increase in the pressure of the condenser. Also, when the concentration of the LiBr solution moving into the absorber is lowered, the COP increases.

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