In the application of clean energy heating

the development of a low-carbon winter heat supply in severe cold regions of China is hindered by the stability of heat sources. To ensure the smooth transformation of traditional energy to clean energy heating modes

the feasibility of a heating system coupling traditional and clean energies was studied using the heating system of an office building in a cold region of China as the research object. The air-source heat pump (ASHP) heating system used in the office building in this study was field-tested. The problems existing in the heating system were analysed using testing data combined with the existing conditions of the building. Solar-air source heat pump coupled heating system based on heat grid (NH-SASHP) was proposed

and the system model was established using TRNSYS software. The operation effect of the NH-SASHP coupling system was analysed

and the control strategy of the coupling system was optimized. The results showed that NH-SASHP system possessed certain advantages over the ASHP system during the heating season

and the energy saving rate is 50.79 % compared with the ASHP system. Under the most unfavourable working conditions in the middle of severe cold

the indoor temperature compliance rate was 100 %. The average coefficient of performance of the heat pump system (COP

sys

) of NH-SASHP system and ASHP system were 6.27 and

3.55

respectively. The operating cost of the NH-SASHP system is approximately 72.3 % of the ASHP system.