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분말형 집광기에 의한 태양열 스털링엔진 발전시스템의 성능예측
배명환(Myung-\han BAE),강상율(Sang-Rul Kang),장형성(Hyung-Sung Chang) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.3
A concentrator projection area must be increased to raise the output level of a solar power system. In such a case, stretched-membrane concentrators are sometimes used instead of ones made by monolithic construction. The simulation analyses of a solar power system with stretched-membrane concentrators, which consist of sixteen mirror elements divided into two along the radial direction and eight along the circumferential direction, by using a stirling engine are carried out to predict the system performance in this study. In addition, influences of mean pressure on mechanical efficiency and load factor on the efficiency of engine/generator subsystem are discussed in simulation. It is<br/> found that the efficiency of stretched-membrane concentrators is lower than one of monolithic type, especially affected strongly by the smaller slope error, and the collector efficiency decreases as the direct solar radiation is small.<br/>
태양열 스털링엔진 발전시스템에 있어서 수열기 구경비의 최적설계
배명환(Myung-whan Bae),강상율(Sang-rul Kang),장형성(Hyung-sung Chang) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
The total system efficiency of a solar power system with monolithic concentrator using a stirling engine is dependent on the efficiencies of collector/receiver and engine/generator systems, respectively. Consequently, in particular, the receiver aperture that goes through the concentrated solar beam is important, and its optimal diameter is in existence. If the diameter is great, the solar incident energy increases, while the heat loss also increases. To maximize the system efficiency throughout the year, in this study, simulation analyses are applided to the optimal design of aperture ratio and the prediction of system performance in four sites, Seoul, Busan and Jeju in Korea, and Naha in Japan selected as test sites. The intensities and distributions of direct solar radiation are different from the respective test site. The system power level, however, is the same demand of a 25 kW output. It is found that the optimal aperture ratio can be plotted on a curve regardless of test sites and weather conditions, and that it grows larger with increasing the summation of direct solar radiations.