| With the rapid economic and social development, our country comes to realize that in the process of development, we have to attach importance to energy crisis and energy conservation. Therefore, we must try our best to develop and utilize the sustainable energy. Based on their resourceful and environment-friendly advantages, solar energy and wind energy are widely used in the field of solar-assisted heat pump system. However, due to the instability and lower utilization efficiency of solar energy and the poor low-temperature performance of domestic air-source heat pump system used in cold winter. It becomes an effective method to solve the problem with the development of the new heat pump system of stable performance and high efficiency.In order to make full use of the abundant solar energy resource in the area of Shangri-la and improve the low temperature performance of air-source heat pump system, the paper came up with a sort of solar-assisted heat pump system that was suitable in cold Tibetan area of Shangri-la. The main contents are as follows:1. This paper briefly reviewed the research status of solar and heat pump heating system at home and abroad, as well as fully introduced the system structure and working principle. Then, a set of experimental platform of solar and heat pump heating system was built according to the matching calculation and a series of theoretical simulation of every part.2. The solar and heat pump heating system was tested and analyzed under different conditions of solar radiation(15MJ/m2, 20MJ/m2 and 25MJ/m2). And the results indicated that during the test, the average heat loss coefficient of water shortage tank is 7.08×10-3KJ/(m2·K·s). Under the condition of daily total radiation of 20MJ/m2, the stability of the heating system was higher, and the system could meet the heating needs in cold area of Shangri-la. In order to verify the consistency between theoretical simulation and experimental test, this paper took daily total radiation of 20MJ/m2 as an experimental sample. Compared to the results of theoretical simulation and experimental test, it was found that the idealization of influencing factors of external environment contributed to the error when the experiment was carried out. And the error value is within 15%.3. This paper conducted the comparative study of the performance between solar and heat pump heating system and the single heat pump system. The study indicated that, compared to the single heat pump system, the heat was provided by solar radiation with the maximum of 29.4MJ in May and reached the minimum of 15.4MJ in January under the condition of heating for the year(heat for life). Moreover, the annual energy saving could reach 87.2%, which was equivalent to the power of 2188 k W·h. Compared to the single heat pump system, the time was significantly shortened to raise the room temperature from 10 to 16℃ ℃. With the increase in solar irradiance, the reduction of the time became much greater. When outdoor temperature is-7℃, 2℃ and 7℃, the heating of solar and heat pump heating system respectively was improved about 16.2%, 14.1% and 11.5%, while the COP respectively about 19.0%, 10.6% and 5.5%.4. This paper optimized the design of solar-assisted heat pump system, and put forward a series of the problems and solutions in the course of the installation and operation. Finally, this paper studied the feasibility of the solar and heat pump heating system from diverse aspects, such as, society, environment and economy. The results indicated that the matching selection and the performance research of components were helpful for the system to work stably. Furthermore, the initial investment and operating cost could also be effectively reduced.
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