The Applicable Research Of Solar Collector System In South Facade Of Building

Through the simulation of FLUENT and experiment, the article discloses the principle of the temperature filed and the flow field in all-glass evacuated solar collector tube in the collecting state. It analyzes the factors influencing on the temperature field and the flow field. The article also analyzes the function of inserted rod to the collecting efficiency of evacuated tube installed vertically. In the end of the article, the effect of inserted rod on collecting efficiency is primarily verified by experiment. The following is the major content and study results:1. According to the solar radiation in long period, the long period direct radiation and scattered radiation per hour on horizontal and vertical plane are computed on the characteristic day of June and December in Shanghai region. This result is fitted into the function of time. For the solar radiation received by evacuated tube installed vertically, based on the Clear Day Solar Radiation Model, the solar radiation distribution on the surface of evacuated tube is calculated by MatLab programming under the different altitude angle and azimuth angle. This result also is fitted into the function of round angle.2. Through UDF programming, the solar radiation distribution on evacuate tube is acted as the boundary profile in FLUENT. The flow field and the temperature field in evacuated tube are computed in FLUENT. The heat loss and the average temperature of hot water can also be gotten. According to the simulation result, the effect of natural convective heat transfer is good, but there is stagnant zone at the top of evacuated tube. This stagnant zone decreases the collecting performance of evacuated tube.3. According to the analysis of the factors influencing on the performance of evacuated tube, the absorption co-efficiency and the emission co-efficiency has an important impact on the performance of evacuated tube. The method of inserted rod is proposed to optimize the performance of evacuated tube installed vertically through the simulation of FLUENT. Furthermore, the experiment primarily verifies the function of this method to the performance of evacuated tube.