论文部分内容阅读
本文采用真空集热管在抛物槽式太阳能平台上进行了实验研究,传热工质为YD300型合成导热油。实验测定了该集热管的散热损失,并数值模拟了吸热管表面的能流密度分布。以此为边界条件研究了该集热管的换热性能。结果表明,循环工质温度和环境温度之差为180℃时,散热损失为220 W/m;该集热器吸热管表面圆周方向能流分布集中,流量对温度分布影响较大,当太阳直射辐照为1000 W/m~2,导热油温度为200℃,流量为0.5 kg/s时,吸热管圆周方向最大温差50℃左右,当流量增加到2.0 kg/s时,最大温差减小到20℃左右。
In this paper, vacuum tube collector in parabolic trough solar platform for an experimental study of heat transfer fluid YD300-type synthetic heat transfer oil. The heat loss of the collector tube was experimentally determined, and the energy density distribution on the surface of the absorber tube was numerically simulated. Based on this, the heat transfer performance of the collector tube was studied. The results show that when the difference between circulating refrigerant temperature and ambient temperature is 180 ℃, the heat loss is 220 W / m. The energy flux distribution in the circumferential direction of the heat absorption tube is concentrated, and the flow rate greatly affects the temperature distribution. The maximum temperature difference in the circumferential direction of the heat absorption tube is about 50 ℃ when the direct irradiation is 1000 W / m ~ 2, the temperature of the HTF is 200 ℃ and the flow rate is 0.5 kg / s. When the flow rate increases to 2.0 kg / s, Small to about 20 ℃.