Solution Study On Heating Performance Of A New Solar-Air Multi-source Heat Pump

In the present world, with energy saving and environmental protection is attracting widespread interest. The research of clean renewable energy sources which are used as the heat sources have become a research hotspot. Based on the resourceful and clean advantages, the air heat source and solar heat source have become the used hotspot. But because of the poor low-temperature heating performance of single air-source heat pump(S-ASHP) in winter and the low density, intermittence and instability of solar energy, the application of S-ASHP and solar-source heat pump are limited. In view of the above outstanding problems of S-ASHP and solar-source heat pump, a new solar-air multi-source heat pump is developed in this paper. The new solar-air multi-source heat pump(SA-MSHP) can realize refrigerant synchronous combined heat transfer with two non-homomorphism renewable heat sources, air and solar energy, greatly improves the heat transfer efficiency, and also well realizes mutual compensation of advantages of S-ASHP and solar-collecting technology. The use of it has higher economic value and social benefit.In this paper, numerical simulation is presented to study the heating performance of SA-MSHP. The parts and the system math models of SA-MSHP are built. The simulation datas of SA-MSHP at every heating conditions are working out. The simulation results shows that the low-temperature heating performance of SA-MSHP is better than S-ASHP obviously. With the outdoor temperature drop, SA-MSHP has more remarkable advantages than S-ASHP on the low-temperature heating performance. In the ultra-low temperature heating condition 2 and the outdoor temperature is -15℃and the flow of the solar hot water is 0.6m3/h, compared with S-ASHP, the heating capacity and the COP of SA-ASHP respectively increase by about 29% and 35%. Through the analysis of the low-temperature heating performance, the tempreature difference between the two heat sources plays a important role on the heating performance of SA-ASHP. Important concepts are proposed in this paper which is "the maximum effective temperature difference of the dual heat source" and so on.The low-temperature heating performance of SA-ASHP is also studied by experiments. The experimental results show the same discipline as simulation results that the heating performance of SA-ASHP under the heating condition is obviously better than S-ASHP. The math model proves to be satisfied by comparing the results of the difference between the simulation datas and experimental datas which is under 15%. The study of this paper is helpful for the further study of SA-ASHP. And it also forms the foundation for the design of SA-ASHP and the development of selection software.