Effect of heat collecting method on performance of all-glass vacuum tube solar water heater

被引：0
|
作者：
Li J. [1 ,2 ,3 ,4 ]
Ye H. [1 ,2 ,3 ,4 ]
Deng C. [1 ,2 ,3 ,4 ]
Huang J. [1 ,2 ,3 ,4 ]
Wang C. [1 ,2 ,3 ,4 ]
机构：
[1] Lanzhou University of Technology, Western China Energy & Environment Research Center, Lanzhou
[2] Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Gansu Province, Lanzhou
[3] China Northwestern Collaborative Innovation Center of Low-carbon Urbanization Technologies, Lanzhou
[4] College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2021年 / 42卷 / 01期
关键词：
All-glass vacuum tube; Collector efficiency; Forced convection; Heat losses; Natural convection; Solar water heaters;
D O I：
10.19912/j.0254-0096.tynxb.2018-0731
中图分类号：
学科分类号：
摘要：
In this paper, three different types of evacuated glass tubes solar water heat collector are considered, namely natural circulation vertical tube, forced circulation vertical tube and forced circulation horizontal tube. The main objective is to compare and analyze the performance of the fore mentioned types in term of heat collection and efficiency. This experiment was conducted in Lanzhou city, Gansu province, China. The experiment was carried out within five consecutive days in March, where the average ambient temperature was ranged 8.9 to 12.0℃, solar radiation ranged 19.0 to 25.7 MJ/m2, and a wind speed ranged 0.5 to 1.3 m/s. The experimental result revealed that, the effective heat collection and the average efficiency of the natural circulation vertical tube water heater is ranged 6.6-8.3 MJ and 10.8%-14.8% higher than that of the forced circulation vertical tube water heater. The effective heat collection and average effective heat collection efficiency of the forced circulation vertical tube water heater is ranged 0.9-3.4 MJ and 1.6%-5.0% higher than that of the forced circulation horizontal tube water heater. Experimentally, the variation between the three types is mainly due to effective heat collecting area, heat exchange intensity inside the vacuum tube, and heat loss of the circulating pipe. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.
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页码：103 / 111
页数：8
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