Optimization of heat exchanger area for doublestage coupling heat pump heating systems

Performs the optimization with finite time thermodynamic analysis and obtains the allocation of heat exchanger area for doublestage coupling heat pump systems that maximize the objective function, and the analytical expressions about the optimal temperature of working fluids, the minimum total heat exchanger area and the minimum power input. With an example, analyses the effect of total heat exchanger area on system performance and the optimizing results under different conditions and discusses the impact of exchanger type on the minimum exchanger area.