摘要
焦面能流密度分布是评价太阳能聚光器聚光效果的关键因素,对聚光太阳能电池或热发电接收器的设计、安装和传热分析等起到了决定性作用.利用铠装热电偶高温测量的优势,提出基于热电效应原理的能流密度分布间接测量方法.通过ANSYS软件构建铠装热电偶的传热模型,将聚光太阳能能流作为输入,对其稳态传热过程进行分析,得到能流密度与输出温度之间的热力学函数,利用此函数的反函数开展高倍太阳能聚光焦面能流密度的测量.研究了风速和环境温度对模型的影响.结果表明:风速对该函数关系影响较大,环境温度影响很小.采用菲涅尔透镜搭建实验系统,对模型进行了验证,能流密度大于600 kW/m2 时,实测数据与模型的相对误差在5%以内,模型的准确度较好.
Abstract
The energy flux density distribution of high-power solar concentrators on focal plane is a key factor to evaluate its concentrating effect,and it plays a decisive role in design,installation and heat transfer of concentrating solar cells or thermal power receivers.The indirect measurement method based on thermo-electric effect was proposed by taking advantage of high temperature measurement of sheathed thermocouple.The heat transfer model of armored thermocouple was constructed by ANSYS software.The concentrating solar energy flux density was taken as the input to conduct steady heat transfer model,and the thermodynamic function between energy flux density distribution and output temperature was obtained.The energy flux density distribution on focal plane of high power concentrator could be measured by inverse thermodynamic function.The influence of wind speed and ambient temperature is analyzed.The simulation results show that the influence of wind speed is greater than that of ambient temperature.Fresnel lens was used to build the experimental system and the model is verified by experiments.The relative error between measured data and model is less than 5%when the flux density is higher than 600 kW/m2.The accuracy of the model is good.
基金项目
内蒙古自治区研究生科研创新项目(S20231135Z)
维普
万方数据