Numerical Study of Concentration Characteristics of Linear Fresnel Reflector System
선형 프레넬 반사판 시스템의 집광 특성에 대한 수치해석 연구

Hyun Jin Lee, Jong Kyu Kim, Sang Nam Lee
2015 Transactions of the Korean Society of Mechanical Engineers B  
기호설명d : 반사판 폭 (m) g : 반사판 사이의 거리 (m) Abstract: In this study, we numerically investigated the concentration characteristics of a linear Fresnel reflector system that can drive a solar thermal absorption refrigeration system to be installed in Saudi Arabia. Using an optical modeling program based on the Monte Carlo ray-tracing method, we simulated the concentrated solar flux, concentration efficiency, and concentrated solar energy on four representative days of the year -the vernal equinox,
more » ... ernal equinox, summer solstice, autumnal equinox, and winter solstice. Except the winter solstice, the concentrations were approximately steady from 9 AM to 15 PM, and the concentration efficiencies exceed 70%. Moreover, the maximum solar flux around the solar receiver center changes only within the range of 13.0 ~ 14.6 kW/m 2 . When we investigated the effects of the receiver installation height, reflector width, and reflector gap, the optimal receiver installation height was found to be 5 m. A smaller reflector width had a greater concentration efficiency. However, the design of the reflector width should be based on the capacity of the refrigeration system because it dominantly affects the concentrated solar energy. The present study was an essential prerequisite for thermal analyses of the solar receiver. Thus, an optical-thermal integration study in the future will assist with the performance prediction and design of the entire system. § 이 논문은 2015 년도 대한기계학회 열공학부문 춘계학술 대회(2015. 4. 22-24., 부산파라다이스호텔) 발표논문임 † Corresponding Author, hyunjinlee@kookmin.ac.kr
doi:10.3795/ksme-b.2015.39.12.927 fatcat:ymvja6zjhza2fgunzmz4qwtemm