Theoretical analysis and optimization of a double-effect parallel-flow-type absorption chiller

A thermodynamic analysis was carried out to study the effect of design parameters including heat-recovery ratio, solution circulation ratio and distribution ratio of solution on the performance of a double-effect absorption chiller of the parallel-flow-type using water-lithium bromide as the working fluid. Increases in the heat-recovery ratios of the high-temperature heat exchanger and the low-temperature heat exchanger, the distribution ratio of the solution, and a decrease in the solution circulation ratio, improved the coefficient of performance. Effects of heat-recovery ratios in the high-temperature heat exchanger and low-temperature heat exchanger on the total heat-transfer area of the absorption chiller were weak. The distribution ratio of the solution affected the outlet temperatures and strong concentrations in a high-pressure generator, low-temperature heat exchanger and a high-temperature heat exchanger. Finally, the optimum design and operating conditions of a double-effect absorption chiller are suggested based on this cycle simulation analysis. Copyright (C) 1996 Elsevier Science Ltd.