摘要
为了提高固定条形镜面太阳能聚光集热器的集热性能，该文介绍了固定条形镜面聚光集热的工作原理，利用矢量分析方法得到了固定条形镜面任一镜元入射角及有效采光面积的计算公式。与此同时，建立了固定条形镜面反射聚光器的腔体式玻璃-金属真空管吸收器三维模型，利用蒙特卡洛光线追迹模拟不同偏转角情况下的聚光吸收器面上能流分布特征、光学效率、光学损失及能流分布。结果表明，镜面反射率和吸收器吸收率分别为0.92、0.9时，聚光系统在太阳光线偏转0～40°角范围内光线吸收率为74.08%～98%、光学效率为56.97%～73.65%。此外试验研究了梯形槽吸收器和腔体式玻璃-金属真空管吸收器在不同偏转角及不同集热温度的热性能。在环境温度和辐射相对较低情况下，腔体式玻璃-金属真空管吸收器的热效率比梯形槽吸收器热效率高2%～3%；流体出口温度由76.7℃升至99.6℃时，腔体式玻璃-金属真空管吸收器效率由46.93%降至39.98%。
In order to improve the thermal performance of a fixed linear mirror solar concentrator, its working principle was introduced in this paper. The equation of incidence angle and illuminate area had been obtained by vector analysis. At the same time, the 3D model of a cylindrical cavity glass-metal vacuum tube absorber and a fixed linear mirror solar concentrator were established. The Monte Carlo ray tracing method was applied to investigate the concentrating characteristics of the concentrator. The flux distribution on the receiver was simulated and drawn with TracePro software, as a ray trace analysis at different transverse angles determined optical efficiencies, optical loss, and flux distribution of the absorber. The results showed that the overall ray’s acceptance of 74.08%-98%and optical efficiency of 56.97%-73.65%were obtained from the transverse angles of 0° to 40°with the mirror reflectance of 0.92 and the receiver absorbance of 0.9. In addition, the thermal performance of the trapezoidal cavity absorber and the cylindrical cavity absorber were studied experimentally at the different transverse angles and output temperatures. The cylindrical cavity glass-metal vacuum tube absorber had a significant advantage in terms of superior thermal performance as compared to the trapezoidal cavity absorber. The thermal efficiency of the cylindrical cavity glass-metal vacuum tube absorber was higher than the trapezoidal cavity absorber by 2%-3% at the low environment temperature and irradiation under the same condition. The thermal efficiency of the cylindrical cavity glass-metal vacuum tube absorber decreased from 46.93%to 39.98%as the output temperature increased from 76.7℃ to 99.6℃.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2014年第1期160-168,共9页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(51206097)
国家自然科学基金项目(51106088)
山东大学“985工程”自主创新基金资助项目(2011JC002)
关键词
太阳能
几何光学
辐射
能流密度
固定条形镜面聚光器
矢量法
solar energy
geometrical optics
radiation
energy flux density
fixed mirror solar concentrator
vector method
