고정형과 추적형 Evacuated CPC 집열기의 열성능 비교 = Comparison of the Thermal Performance with Stationary and Tracking Evacuated CPC Collectors

다국어 초록 (Multilingual Abstract)

A numerical study is performed to investigate the effect of sun tracking on the thermal performance of the evacuated compound parabolic concentrator (CPC) collectors. The evacuated CPC collectors consist of a two-layered glass tube, a copper tube and a reflector. The collector has a copper tube as an absorber and a reflector inside a glass tube. The water is used as a working fluid. The length and the diameter of the glass tube are 1,700㎜ and 70㎜, respectively. The length and the diameter of the copper tube are 1,700㎜ and 25.4㎜, respectively. Ray tracing analysis is carried out in order to compare absorbed heat fluxes on the absorber surface of the stationary and tracking collectors. The collected energy is calculated and compared with that on a fixed surface tilted at 35° on the ground and facing south. The results indicate that the collected solar energy of the sun tracking system is significantly larger than that of a stationary collector. The sun tracking evacuated CPC collectors show a better performance with an increase in the thermal efficiency of up to 14% compared with an identical stationary collector.

참고문헌 (Reference)

1 "고지대 일사량 특성분석에 관한 연구" 23 : 2003

2 "Two Axes Sun Tracking System With PLC Control" 1931-1939, 2003

3 "Economic Optimization of Stationary Nonevacuated CPC Solar Collectors Transactions of the ASME Vol" 1987

4 "Design and Construction of a Sun Tracker" 1984

5 "Comparison of the Optics of Non-tracking and Novel Types of Tracking Solar Thermal Collectors for Process Heat Applications up to 300℃" 76 : 2004

6 "A Statoinary Evacuated Collector with Integrated Concentrator" 1984