A Numerical Study on Performance Optimization of Household Solar-air Source Heat Pump System in Hot Summer and Cold Winter Regions of China

Abstract

To meet the needs of household cooling, heating and domestic hot water in hot summer and cold winter regions, a solar-air source heat pump coupling energy supply system for households was established in Taiyuan. The residential energy consumption model and the residential building model in hot summer and cold winter regions were developed with TRNSYS software based on the system’s annual operation data. Results show that the annual solar collector efficiency of the system is about 42%, and the energy efficiency ratio of the system is 5.42. This shows a higher degree of solar energy utilization and a stable and reliable system. The dynamic payback period of the cost difference of the constructed system is about 11 years, and the annual carbon emission is reduced by 13.5%. For a two-bedroom apartment in a hot summer and cold winter region, after the selection of an air source heat pump according to the cooling and heating load, the recommended range of the matching solar collector area and hot water storage tank volume are calculated at 2.46 ± 0.3 m² and 0.20 ± 0.05 m3, respectively. The results of this study could provide a theoretical basis for the popularization and application of similar air source heat pump systems.