Comprehensive exergy analysis and optimization of operating parameters for double effect parallel flow absorption refrigeration Cycle

Abstract In this communication, comprehensive exergy analysis has been discussed for double effect parallel flow direct as well as indirect fired vapour absorption refrigeration systems using Lithium bromide-water as working fluid. The temperatures in the main generator and intermediate generator and condenser are optimized parametrically. The solution distribution ratio is also optimized considering exergy coefficient of performance (ECOP) and exergy destruction rate (EDR) as the objective functions. Further, comparison of parallel flow cycle with series flow configuration are presented for same operating parameters. Moreover, the effect of the temperature difference between intermediate generator and intermediate condenser of both the double effect parallel and series flow cycles are discussed. Results indicate that the maximum ECOP of the parallel flow cycle are 3-6% higher than the series flow cycle and minimum EDR is about 4% lower as compared to the series flow configuration. Furthermore, optimum temperature of intermediate generator for parallel flow cycle is significantly lower than the series flow cycle while main generator temperature is higher. Optimum parameters are tabulated for both series and parallel flow cycles, which will help to the design engineers.