Abstract: As an important heating equipment, researching energy-saving strategies for heat pump heating machines has significant practical significance. Propose a multi parameter correlation model based on supply water temperature, return water temperature, indoor and outdoor temperature, which avoids energy waste caused by continuous high water temperature operation by calculating the ideal return water temperature in real time. To verify the reliability and energy-saving effect of the model, experiments and field tests were conducted. The results show that this strategy can achieve dynamic adjustment of return water temperature, while ensuring comfort, the system energy saving rate is about 29%. Further field tests in Mohe City showed that under similar weather conditions and defrosting times, the average daily power consumption of the unit using this model was 45.74 kW·h, which was 19.36% lower than that of the conventional fixed water temperature (45 ℃) heating mode, and the energy-saving effect was significant. At the same time, the model effectively reduced the frequency of compressor start stop through dynamic adjustment (by 12.5%), and the indoor temperature remained stable at 26 ℃ after 24 hours of operation, achieving high efficiency and energy saving while ensuring thermal comfort, provides a reference for energy-saving optimization of heat pump heating systems in cold regions.

Key words: Heat pump, Energy saving strategy, Variable water temperature, End heat dissipation, Thermal comfort