Experimental Research On The Thermal Performance Of Unglazed Transpired Collector Based Solar Air Heating System

Along with the rapid development of the society, the global environment pollution is serious. As a kind of renewable energy, the solar energy has been widely application in architecture. Solar wall system as a new type of solar heating technology is being rapidly applied to many countries. Solar wall system has proven to be effective both in heating and ventilation. It achieved with the combination of buildings, and provides a new way of solar energy efficient utilization.unglazed transpired solar collector consists of a solar heating system which includes a porous wall and a passage between the porous wall and the existing wall and an air distribution system which inhales outdoor air. The first part of the articles introduces the building process of the two experimental platforms and introduces instrumentation of the experiment. It also introduces the method of measuring airflow. Then measuring the thermal properties of solar wall system mainly in -20℃to -10℃, -10℃to 0℃, 0℃to 10℃and 10℃to 20℃four temperature range. Bench which is built in the school test black, green and blue three colors of the solar wall system's thermal properties and the change rule of thermal efficiency. Research shows that the thermal efficiency in the range of -10℃to 0℃is higher than any other ones. With the increase of outdoor temperature, the thermal efficiency of solar wall system is reduced when the condition of the sun radiation intensity and suction volume is similar. The thermal efficiency of the black sun wall system is higher than green solar wall system and the thermal efficiency of the blue solar wall system is the lowest among the three. In the condition of outdoor temperature and solar radiation intensity is similar, along with the increase of air suction, the thermal efficiency of the three solar wall system is increased.We also test that transparent glass plate has influence on solar wall system in this experiment. Through the experimental stage in the factory, we tested transparent glass plate had influence on the surface temperature of the solar wall system. Because the exit temperature of solar wall system with glass plate is higher than another one,thermal efficiency of solar wall system with glass plate is always higher than the solar wall system without cover,but the improvement is not obvious.The last part of the thesis analysis experimental error and the result is acceptable.