槽式太阳能集热器热性能测定新方法实验研究  

Performance Study of Parabolic Trough Receivers with a Novel Method

作　　者：熊亚选[1] 吴玉庭[2] 崔武军[2] 孟强[2] 马重芳[2] 徐鹏[1] 

机构地区：[1]北京建筑大学供热供燃气通风及空调工程北京市重点实验室,北京100044 [2]北京工业大学传热强化与过程节能教育部重点实验室暨传热与能源利用北京市重点实验室,北京100124

出　　处：《工程热物理学报》2015年第3期577-581,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51206004);国家科技支撑计划课题(No.2014BAJ01B05)

摘　　要：集热器是槽式太阳能热发电系统吸收传输高热流密度太阳辐射能的核心部件。针对传统测定方法的不足,本文提出了一种测定槽式太阳能集热器热性能的直接电流加热DCH法。该法根据金属导体的焦耳效应,将吸热器金属管作为负载电阻,借助大电流电源对吸热器通电加热,集热器达到热平衡后流过吸热器的电流和被测段两端电压的乘积为集热器在该吸热器与环境温差下的热损失。基于DCH法的实验系统结构简单、制造成本低、操作方便,比传统方法的测量速度提高了5倍以上。实验结果与文献对比表明该测量的实验数据不确定度低,热损失曲线质量较好,实验结果精度高,显示了DCH法的可行性和可靠性。Parabolic trough receivers are the core of a solar trough power plant,which absorb and transfer the high flux solar energy to the heat transfer fluid flowing in it.A direct current heating method is put forward below by analyzing the inadequacies of traditional methods.Voltage is imposed on both ends of the absorber and then the absorber is self-heated via the large electrical current flowing through the absorber based on the Joule Effect.Once the receiver reaches a thermal equilibrium the product of the voltage imposed on the absorber and the electrical current flowing through the absorber is equal to the heat loss of the receiver to ambient environment at corresponding temperature difference of absorber temperature above ambient.The experiment system is simple,low-cost,and easy to operate.Experiment results show that curve of heat loss is smooth and measurement uncertainty is low,which means accuracy of the experiment results is high.

关 键 词：槽式太阳能集热器 直接电流加热 热损失 发射率 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]