Exergy Analyses of Half-Effect, Single-Effect and Double-Effect Absorption Cooling Cycles

This work presents exergy and energy analysis of a half effect parallel flow, single effect and double effect absorption systems for comparison. For the thermodynamic properties of lithium bromide-water solutions a computer program is developed by the author in FORTRAN codes for th e energy and exergy analysis. It is found that the coefficient performance (COP) and the exergetic coefficient performance (ECOP) of the double effect parallel flow absorption systems are higher than the single effect and the half effect cycles. For the do uble effect cycle COP and ECOP are found as 1.196 and 0.284, and for the single effect cycle COP and ECOP are found as 0.68 and 0.254, respectively. For the half effect cycle COP and ECOP are found as 0.455 and 0.24, respectively. The exergy loss is calculated for each component. Most of the irreversibilities are found in the evaporator and in the absorber. It is concluded that the performance of the absorber and the evaporator is crucial for the three cycles. Improving and better design of the evaporator and the absorber will directly affect positively and improve the performance and the working conditions of the three cycles