Multiobjective optimisation of absorption heat pump performance with double internal irreversibility based algorithm NSGAII: case of three-heat-source model

Abstract

The optimisation of an irreversible absorption heat pump based on the new thermo-ecological criterion is presented. We mathematically modelled the ecological coefficient of performance (ECOP), and the entropy generation rate (S) of an absorption heat pump with three heat sources and double internal irreversibility. Internal irreversibility for generator – absorber assembly and the one for condenser – evaporator assembly were considered. S and ECOP were assumed as objective functions in the multi-objective optimisation process. The Multi-Objective Optimisation Algorithm (MOEA) enhanced by the NSGAII algorithm was used to optimise the two functions. In order to obtain a better operation system, the ECOP was maximised and S was minimised thanks to the Pareto front established using the NSGAII algorithm. From the variations of ECOP and S according to two irreversibility parameters, it was found that those irreversibilities have a strong influence on the ECOP (lowering) and S (increasing).