摘要
热管作为热超导元件已开始应用于中高温槽式太阳能热利用系统,但太阳辐射频繁变化的特点使得热管启动性能对热管集热性能影响很大。本文研制一套水平环路热管(HLTS),以导热姆为工质,搭建了热管启动性能测试平台,考察充液量、热通量及环境温度对启动性能影响。结果表明,工质流动方向为单向流,充液量对HLTS运行的影响较大,最佳充液量3.325 kg,当水平蒸发段工质充满度为100%时,蒸发段传热流型发生改变,管内形成脉动流;热通量增大时启动时间减少,启动温度为150℃不变;环境温度<9℃时,对热管启动有很大影响,冬季工质凝固,HLTS启动时间延长,影响热管集热。
Thermosyphon has begun to be used in the midium-high temperature trough type solar energy heat utilization system. The characteristics of the solar radiation makes a great influence on the solar collection efficiency in the start-up performance of thermosyphon, and thus solar collecting performance changes. The novel horizontal loop thermosyphon（HLTS） with the dowtherm has been developed. The platform has been set up to test the influence of filling content, heat flux and ambient temperature to the start-up performance of the HLTS. As the result, the direction flow of steam in the evaporator of HLTS is single and the filling content has influenced the operation of heat pipe. The best filling content of injection is 3.325 kg, and the pulsating flow forms in the evaporator when the ratio is 100%. The start-up time changes short when the heat flux increases in the same filling, while the start-up temperature of HLTS does not change and keeps in the temperature of 150℃ when the filling content is 3.325 kg. The best heat flux is 7.619 k W·m^-2 as the NHLT used in the solar collector. Moreover, the low temperature makes the oil frozen in the evaporator at below 9℃ with extending time of the start-up of thermosyphon.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2016年第5期1755-1761,共7页
CIESC Journal
基金
国家科技支撑计划项目(2014BAJ01B06)
国家自然科学基金项目(51276086)~~
关键词
太阳能
热虹吸管
传热
启动特性
充满度
solar energy
thermosyphon
heat transfer
start-up performance
fullness
