이중 진공관형 태양열 집열판의 성능시험에 관한 연구
Study on performance Testing of Evacuated Tube Solar Energy Collector System
이중 진공관형 태양열 집열판 진공관 집열판;
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This paper is a study on performance testing of evacuated tube solar energy collector system. The glass evacuated solar collector consists of 12 dual glass tubes, a copper tube in which with working fluid, flows a slip-in absorber assembly and a reflector. The solar energy collector area is 750mm×1600mm. The length and diameter of the glass tube of black-chrome are 1500mm and 37mm, respectively. And height and diameter of insulated storage tank are 1000mm and 420mm. The solar collector is installed on roof of building and storage tank and the test apparatus are located in a laboratory room. Azimuth angle of solar collector is directed to south, tilt angle of solar collector is 35°. The rate of circulated working fluid is at 1.98l/min of water. The experiments were performed mainly into two parts. The first experiment was carried out during spring season with non-insulated storage tank and the second one during autumn season with insulated storage tank. From the experiments, the collector efficiencies according to solar insolation on the collector are between 57% and 60%. And equation of the collector efficiency is also plotted to (T_(in)-T_(a))/I_(c), where T_(in) is inlet fluid temperature of the collector, T_(a) is atmospheric temperature, and I_(c) is solar insulation on the collector. This efficiency equation is ranged from 54% to 40%, and shows that the efficiency of the experimented collector is superior to efficiencies of other type collectors when (T_(in)-T_(a))/I_(c) is large, whereas this efficiency is somewhat lower than those of other type ones when (T_(in)-T_(a))/I_(c) is small. However, thermal efficiency of storage tank to solar insulation on the collector is approximately 30% with 20mm insulated thickness of the storage tank even though average collector efficiency is 58.5%.