集热方式对全玻璃真空管太阳能热水器性能的影响  

EFFECT OF HEAT COLLECTING METHOD ON PERFORMANCE OF ALL-GLASS VACUUM TUBE SOLAR WATER HEATER

作　　者：李金平[1,2,3,4] 叶何立 邓聪聪 黄娟娟 王春龙[1,2,3,4] Li Jinping;Ye Heli;Deng Congcong;Huang Juanjuan;Wang Chunlong(Lanzhou University of Technology,Western China Energy&Enuironment Research Center,Lanzhou 730050,China;Key Laboratory of Complementary Energy System of Biomass and Solar Energy,Gansu Province,Lanzhou 730050,China;China Northwestern Collaborative Innovation Center of Low-carbon Urbanization Technologies,Lanzhou 730050,China;College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学西部能源与环境研究中心,兰州730050 [2]甘肃省生物质能与太阳能互补供能系统重点试验室,兰州730050 [3]西北低碳城镇支撑技术协同创新中心,兰州730050 [4]兰州理工大学能源与动力工程学院,兰州730050

出　　处：《太阳能学报》2021年第1期103-111,共9页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51676094);甘肃省国际科技合作专项(1604WKCA009);兰州市人才创新创业项目(2017-RC-34)。

摘　　要：为对比分析自然循环竖排管、强制循环竖排管和强制循环横排管3种集热方式对全玻璃真空管太阳热水器有效集热量、平均有效集热效率和瞬时有效集热量等的影响,以3组30支Φ58×1800 mm的全玻璃真空管太阳热水器为研究对象,在兰州地区搭建试验平台,在太阳辐射为19.0~25.7 MJ/m^(2),风速为0.5~1.3 m/s,平均环境温度为8.9~12.0℃的情况下进行连续5 d的试验。试验结果表明:自然循环竖排管热水器有效集热量和平均有效集热效率比强制循环竖排管热水器分别高6.6~8.3 MJ、10.8%~14.8%;强制循环竖排管热水器有效集热量和平均有效集热效率比强制循环横排管热水器分别高0.9~3.4 MJ、1.6%~5.0%。从有效集热面积、真空管内部换热强度、循环管道热损失共3个方面解释不同集热方式产生差异的原因。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/m^(2),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 and1.6%-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.

关 键 词：太阳热水器 自然对流 强制对流 集热效率 热损失 全玻璃真空管 

分 类 号：TK519[动力工程及工程热物理—热能工程]