Inversion Method for Optimizing the Condensing Heat Recovery System of an Air-Source Heat Pump

Abstract

An inversion method has been established by this study for calculation of internal parameters for optimization of condensing heat recovery system of an air-source heat pump. Real-time external parameters of a retrofitted system were measured, such as temperature and mass flow rate of cold water, hot water, and air, to provide data for the inversion model. The inversion model would then be used to determine the real-time internal parameters of the refrigerant. The performance characteristics of the heat recovery process of the retrofitted system were evaluated. The internal parameters distribution and variation of heat recovery condenser was modeled and heat transfer in the heat recovery condenser was studied based on the inversion method. The result showed that approximately 70% of the area of the heat recovery condenser was in the two-phase region, and there was less than 50% heat exchange but with more than 80% pressure loss in two-phase region. This work has been demonstrably useful in identifying the shortcomings of the designed system and therefore could contribute to the improvement of the system.