DSG太阳能槽式集热器聚光特性模拟

Simulation on Concentrating Characteristics of DSG Parabolic Trough Collectors

在槽式集热器光学理论的基础上,以DSG太阳能槽式真空集热器为研究对象,建立DSG集热器模型,并运用蒙特卡罗光线追踪法进行辐射计算及分析.通过研究集热器几何聚光比和边界角对集热器吸热管表面圆周方向热流密度分布的影响,获取了集热器的聚光特性.结果表明:计算结果与文献数据吻合良好;随着几何聚光比的增大,吸热管表面圆周方向的热流密度分布趋势不变,数值相应增大;随着集热器边界角的减小,热流密度的最大值增大,热流密度的分布曲线向圆周角-90°方向偏移相应的角度.

Based on optical properties of parabolic trough solar collector,models for such a DSG vacuum collector were established so as to perform relevant solar radiation calculation and analysis by Monte Carlo Ray-Trace Method（MCRT）.To investigate the concentrating characteristics,the effects of geometry concentration ratios and rim angles on heat flux distribution around the heat-absorbing tube in circumferential direction were studied.Simulation results show that the predicted results agree well with the data in reference materials;with increasing geometric concentration ratio,the distribution tendency of heat flux in circumferential direction keeps the same,but the value rises;with decreasing rim angle,the maximum value of heat flux in circumferential direction increases,and the distribution curve moves to the direction of circle angle-90°.