| Recently, solar hot water apparatus has been widely used in buildings. However, such apparatus is usually equipped with electric heater, which is energy-intensive. Thus, many researchers propose to bring heat pump technology into the apparatus, which makes up the solar heat pump system (SHP). The new system can overcome the disadvantages of the former two and give full play to the advantages of theirs.The simulation model was built for the air source heat pump with auxiliary solar water heater based on the Xi'an climatological data in China's meteorological dedicated dataset for building thermal environment analysis. The programs were written for calculating solar unit's and heat pump unit's heating capacity, the refrigerants physical properties, COP of the heat pump unit's and the water heater to predicted the whole system's performance. By the established model, the influence was compared of radiation intensity, heat pump's running time, evaporating temperature and condensing temperature on the hot-water system operating status under special radiation and temperature conditions in special years of Xi'an area, such as the typical meteorological year, the lowest radiation year and the highest radiation year. The solar unit and heat pump unit's optimal parallel running mode and the system's annual running performance parameters under such mode were obtained which revealed that this type of hot water system was energy-saving. The results would be valuable for the further research on solar heat pump's performance and its application in Xi'an area and even the whole country. |
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