带背反射板太阳能真空集热管间距的光学优化  

Optical Optimization of Tube Spacing of Vacuum Tube Collector with Back Reflector Plate

作　　者：张华[1] 季旭[1] 李明[1] 冷从斌[1] 谭礼军[1] 

机构地区：[1]云南师范大学能源与环境科学学院,云南昆明650500

出　　处：《云南师范大学学报（自然科学版）》2016年第1期7-13,共7页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：国家自然科学基金资助项目(51366014)

摘　　要：建立了带背反射板真空管集热器的太阳辐射模型，采用蒙特卡罗光学追踪法研究了不同管间距下集热器吸收体表面的能量分布，利用遮阴模型计算了不同管间距下带背反射板太阳能真空管集热器各季节的太阳辐射收集量．结果表明，管间距为2．3～3．3倍管径时，真空管吸收体表面能量分布均匀，分布范围超过圆周的二分之一；当管间距为1．5～2．3倍管径时，易产生管间遮阴现象，集热吸收体表面能量分布范围不及圆周的一半；当管间距大于3．3倍管径时，易引起集热吸收体局部过热，降低集热管的使用寿命．The solar radiation model of vacuum tube collector with back reflector plate was es- tablished. Utilizing Monte Carlo ray-tracing method, the energy distributions on the surface of evacuated absorber at different tube spacing were characterized. The collected solar irradiation a- mount by solar vacuum tube collector at different tube spacing was calculated using shading model. The results showed that when the tube spacing was in the range of 2.3 to 3.3 times di- ameter, energy distribution on surface of evacuated absorber was uniform and the energy covered over half of circumferential surface of evacuated absorber. When the tube spacing was in the range of 1.5 to 2. 3 times diameter, there was tube shade phenomenon and the energy distribu- tion area on the surface of absorber is less than half of circumferential surface. When the tube spacing was over 3.3 times diameter, local overheat of the absorber was easily caused and life- time of the absorber was reduced.

关 键 词：真空管集热器 管间距 太阳辐射 背反射板 光线追踪 

分 类 号：O435.1[机械工程—光学工程]