直通式全玻璃真空集热器热性能研究  

Research on Thermal Performance of a Straight-through All-glass Vacuum Collector

作　　者：李国帅 罗显峰 赵丹丹[1] 巩景虎 李亮光 Li Guoshuai;Luo Xianfeng;Zhao Dandan;Gong Jinghu;Li Liangguang(Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology,Southeast University,Nanjing 210096,China;Nanjing Jiaye New Energy Co.,Ltd.,Nanjing 210096,China)

机构地区：[1]东南大学江苏省太阳能技术重点实验室,南京210096 [2]南京嘉业新能源有限公司,南京210096

出　　处：《发电设备》2021年第4期236-241,247,共7页Power Equipment

摘　　要：对单根直通式全玻璃真空集热管热性能进行分析和评价,建立一维传热数学模型,借助MATLAB软件采用假设温度法迭代求解,研究集热器热性能的影响因素。结果表明:环境温度、风速及太阳直射辐射强度对集热器热性能影响较大,应充分利用气象参数提高集热器热性能;工质进口温度越高,瞬时热效率越低,而进出口温差改变较小;随工质流量增加,进出口温差先下降最终趋于平缓,因此实际应用中应选取合适的运行参数,使集热器热性能最佳。通过实验验证了模型的正确性,并以对比实验证明了直通式全玻璃真空集热管热性能优于传统式。The thermal performance of a single straight-through all-glass vacuum heat collecting tube was analyzed and evaluated,based on which,a one-dimensional mathematical model of heat transfer was established,and the iterative temperature solution method was used to analyze the factors affecting the performance of the straight-through all-glass vacuum collector with MATLAB software.Results show that the thermal performance of the collector is significantly influenced by the ambient temperature,wind speed and solar radiation intensity;therefore,the thermal performance can be effectively improved by taking full advantages of the meteorological parameters.The higher the inlet temperature of working fluid is,the lower the instantaneous thermal efficiency would be,with basically constant temperature difference between the inlet and outlet.With an increase in flow rate of the working fluid,the temperature difference between the inlet and outlet declines at first,and then gets stable.Therefore,appropriate operating parameters should be selected in actual applications to optimize the thermal performance of the collector.The accuracy of the model has been verified by experiments,and the thermal performance of the straight-through all-glass vacuum heat collecting tube has been proved to be better than that of the traditional type through comparative experiments.

关 键 词：太阳能 集热器 热性能 

分 类 号：TK513.3[动力工程及工程热物理—热能工程]