Study on efficient heating method by solar coupled air source heat pump system with phase change heat storage in severe cold region

In order to reduce carbon emissions and promote the development of sustainable buildings, it is essential to combine solar energy with air source heat pumps. Nonetheless, challenges persist regarding the intermittent and unstable nature of solar energy, coupled with the limited utilization of air source heat pumps in colder climates. Actually, the benefits of the two technologies could be combined to create one of the most efficient heating systems for extremely cold regions by utilizing phase change material for heat storage. This study centers on a heating system that couples dual heat sources for enhanced efficiency. The system utilizes phase change materials for heat storage and introduces an effective operational control strategy. Furthermore, influence of various critical parameters on the composite system is explored. The experiment demonstrated that average power consumption of the compressor is 1.87 kW, which is 21.1% lower and the average coefficient of performance of the system is 5.42, exceeding the original system by 143.0%. Furthermore, the novel system requires just 1.8 h to finish heat storage, which is shortened to 32.7% of the previous system. The enhanced system has now become more efficient and user-friendly, while also boasting improved functionality in low-temperature environments. These improvements are particularly advantageous when the heating system is deployed in regions with severely cold climates.