Research Of Multiple Original Solar Technologies Applied On Demonstration Building

Solar energy building could effectively cut down the consumption of conventional energy. At present, countries all around the world especially developed countries have paid great attention to the development and utilization of solar energy building. In the field of integration of solar energy technology and architecture, solar water heating has been widely used in China, but solar space heating and solar refrigeration conditioning are still in the phase of research and demonstration. However, consensus has not been reached on solar architecture, and the notion of making comprehensive use of energy has not been formed, meanwhile conflict still exists between architectural aesthetics and the function of solar energy. To further research and promote the integration of solar energy technology and architecture, explore the optimal combination form of solar energy technology and architecture, and improve the performance of solar energy system in buildings, We did research on a solar demonstration building in University of Science and Technology of China as an experimental platform, which can show the demonstration of integration of solar energy technology and architecture. The demonstration building integrated the notions of solar-thermal technology building integration, building-integrated PV and building integrated PV/T technology. Solar active and passive space heating system, PV/T system, solar space cooling system and solar water heating system were used to provide the energy consumed by space conditioning, domestic water and electrical appliance. This paper introduced the design notion of solar energy demonstration building and system operation strategy in details, and carried out experimental research and simulation prediction on the performance of solar energy demonstration building. The experimental study mainly includes:1. To solve the problem of the big temperature difference between the north room and south room, and improve the space thermal comfort level, this paper proposed the space heating strategy that employing the active heating system for the north room heating, and compared the performance of different heating strategies of solar active and passive heating system that composed of solar active and passive collector arrays. The result shows that the heating capacity of the active heating system was up to16.0kW, thermal collecting efficiency was above50.0%, COP of electricity performance was21.6. In the optimized heating strategy, thermal comfort evaluated by both PMV calculation and the impact of vertical air distribution were accepted by the scope of ASHRAE-Standard-55. In the experimental study of the water heating performance of solar energy active and passive dual-effect collector in independent operation strategy and joint combination strategy, the impact of different collecting area, different flow rate on the system thermal efficiency was analyzed.2. TRNSYS was used to simulate the platform, construct solar active and passive space heating analogue model. And the feasibility and accuracy of the system simulation model was verified by experimental data. The solar fraction of the solar active and passive space heating system in the demonstration building was predicted by the simulation model, the predicted results was39.5%. In the simulation study of solar fraction in different geographical environment and different geographical environment, the result shows that in Lhasa Area, due to the abundant solar irradiation source, the solar fraction could reach76.0%. By comparison, we can obtain that ambient temperature and solar irradiation were the key factors that impacted solar fraction.3. To better cooperate with solar energy absorption refrigeration system, enhance the operation performance of refrigerator, and improve the thermal comfort, the scheme that combined capillary radiation cooling end and solar energy absorption refrigeration system was proposed. Besides, the space cooling strategy that process temperature and humidity separately was designed, and the notion of gradient utilization of chilled water was proposed. The proportioning valve controlled the temperature of the water entering indoor capillary mat, which prevent the dewing problem of the indoor capillary mat. The experimental result shows that under the off-rating condition(hot water inlet temperature of80℃), the cooling capacity of solar absorption refrigeration system can reach16.5kW, average COP would be0.6, COP of electrical performance can be2.7. In the study of thermal comfort of room, the result indicates that thermal comfort of the south room and north room can meet A degree in ASHRAE Standard55, the impact of air stratification was also within acceptable range. The TRNSYS simulation model of solar refrigeration system was built based on the solar cooling performance parameters obtained in the experiment. The simulation result shows that solar contribution rate of solar refrigeration system to the summer air conditioning load of the demonstration building could reach50.1%.4. The solar photovoltaic/thermal comprehensive utilization systems applied on demonstration building was experimentally studied. The results shows that the average electrical efficiency of the PV trombe wall was12.6%. The average electrical efficiency of PVT was around10.0%, For water heating of the PVT, the intercept efficiency was25.0%, heat loss coefficient of the system was0.08MJ/m2. The performance parameters of solar PV system was obtained in the experiment. In addition, the simulation model predicted the generating capacity of the solar PV system in the whole year operation can reach3885.0kWh.