Exergetic analysis of solar powered absorption refrigeration system using LiBr-H2O and NH3-H2O as working fluids
by Abdul Khaliq, Rajesh Kumar
International Journal of Exergy (IJEX), Vol. 4, No. 1, 2007

Abstract: This study provides an easy to follow description of the second law (of thermodynamics) method as applied to a single effect absorption refrigeration cycle. Two different sets of working fluids: LiBr-H2O and NH3-H2O solution are considered, and a method to calculate the entropy of both working fluids is offered. The total exergy destruction in the system as a percentage of the exergy input from the generator heating water over a range of operating temperature is examined for the system operates on both the working fluids separately. It is found that the total exergy destruction for NH3-H2O solution is significantly higher than the LiBr-H2O solution for a given generator temperature. The exergy destruction in each component and the exergetic efficiency of system operates on LiBr-H2O and NH3-H2O solution is also determined. It is shown that the exergy destructions are significantly occur in generator and absorber, and the exergetic efficiency increases significantly as absorber temperature increases.

Online publication date: Sun, 03-Dec-2006

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