| With the rapid development of the world,heating energy consumption accounts for the proportion of building energy consumption increasing,and traditional heating methods can easily lead to energy crisis and environmental pollution.Using solar energy to replace traditional energy heating attracts people’s attention.In this paper,based on the actual engineering,researches solar assisted air source heat pump heating system Xi’an villa.In this paper,the villa of Xi ’an Lantian in Shaanxi province is regarded as the research object.Firstly the total area is 209.72 ㎡ and daily consumption of domestic hot water 600 L.The paper introduces the design process,calculation and some key equipment’s selection of the system.At the same time,the operation mode of the system and control measures of the system under different working conditions were introduced in detail.Multi operating mode system can not only improve the stability of the heating system,but also can make full use of solar energy.With TRNSYS software as a platform,this system was built and modeled.According to the building,the collector system,the living water tank,the hot water storage tank,the heat pump of systems was analyzed.According to the results of the analysis,23107.05 k Wh energy is consumed by the system during the heating period,in which the collector provides 7178.2 k Wh,the solar energy assurance factor is31%,The system has an average COP of 3.1 on the coldest day and Collectors get energy 87513.41 k J.It Prove that the system is running well.In order to find a balance between economy and comfort of the operating mode,the room temperature and thermal comfort under different control strategies were simulated by TRNSYS.The data show that: peak price shutdown mode is a combination of economy and comfort of the operating mode.In the last part of this paper,the initial investment and operating cost of the solar systems were analyzed.The results showed that: compared with the traditional central heating system,the solar assisted air source heat pump heating system can save 1850 RMB annually,the system’s dynamic investment recovery period is 4.57 years and reduce of carbon dioxide emissions by 30 tons in the life cycle.So the system has a good economy,energy conservation and environmental friendly. |
