流量对抛物面槽式太阳能集热器传热特性影响的实验分析  

Experimental Analysis of the Influence of Flow Rate on Heat Transfer Characteristics of Parabolic Trough Solar Collector

作　　者：徐立[1,2,3,4] 孙飞虎[1,2,3,4] 李钧 张强强[2,3] XU Li;SUN Feihu;LI Jun;ZHANG Qiangqiang(Key Laboratory of Solar Thermal Energy and Photovoltaic System,Chinese Academy of Sciences,Haidian District,Beijing 100190,China;Institute of Electrical Engineering,Chinese Academy of Sciences,Haidian District,Beijing 100190,China;University of Chinese Academy of Sciences,Haidian District,Beijing 100049,China;Beijing Engineering Research Center of Solar Thermal Power,Haidian District,Beijing 100190,China)

机构地区：[1]中国科学院太阳能热利用及光伏系统重点实验室,北京市海淀区100190 [2]中国科学院电工研究所,北京市海淀区100190 [3]中国科学院大学,北京市海淀区100049 [4]北京市太阳能热发电工程技术研究中心,北京市海淀区100190

出　　处：《发电技术》2021年第6期665-672,共8页Power Generation Technology

基　　金：国家重点研发计划项目(2018YFB0905102)。

摘　　要：抛物面槽式太阳能集热器被广泛应用于中温太阳能工业热利用和高温太阳能热发电领域,然而太阳能间歇性的固有缺陷与供能系统期望的稳定连续运行相悖。通常通过调节流量使变太阳辐照条件下运行的槽式集热器提供相对稳定的有用能量输出,进而对其下游设备的稳定性起着关键作用。为了研究流量变化对集热器瞬态热行为的影响,通过人工调节造成流量的阶跃变化来开展实验,并且研究分析了在不同流量下的雷诺数、努塞尔数和传热流体对流换热系数。The parabolic trough solar collector is a commercialized and mature concentrating solar collector,which is widely used in the field of medium temperature solar industrial heat utilization and high temperature solar thermal power generation.However,the inherent drawback of solar energy is contrary to the stable and continuous operations expected by the energy supply system.Usually,adjusting the flow rate of the heat transfer fluid is a method to let the collector provide a relatively stable output under varying solar irradiation conditions,which plays a key role in the stability of its downstream equipments.In order to clarify how the change of flow rate affects the transient thermal behaviors of the collectors,this study carried out experiments with the step-change of the flow rate by the manual adjustment,and then carried out the analysis of Reynolds number,Nusselt number and the convective heat transfer coefficient of the heat transfer fluid with different flow rates.

关 键 词：太阳能热发电 碳达峰 碳中和 温室气体排放 抛物面槽式太阳能集热器 传热特性 对流换热系数 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]