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.
|