槽式太阳能集热管的优化设计

Optimal Design of Slot-type Solar Heat Collector

以槽式太阳能集热管径向截面的二维模型作为研究对象,采用与环形空腔自然对流换热经典实验相同的参数进行在“真空完好”工况下,模拟不同半径比对于集热效率的影响。研究表明:对于“真空完好”情况下,半径比越小集热效率越高;对于环形腔,由于其间几乎只存在辐射换热,因此温度分布都较为均匀不存在局部的特殊性;对于不同半径比,辐射热损的整体趋势线随着半径比的增大而上升;2.43、1.5和1.286三种半径比下的集热管内管的温度分布基本相同。

Taking the two-dimensional model of radial section of slot solar collector as the research object, the influence of different radius ratio on heat collection efficiency is simulated under the condition of "vacuum intact" by using the same parameters as the classical experiment of natural convective heat transfer in annular cavity. The results show that for the case of "vacuum intact", the smaller the radius ratio is, the higher the heat collection efficiency is;for the annular cavity, because there is almost only radiation heat transfer, there is no local particularity in the temperature distribution;for different radius ratios, the overall trend line of radiation heat loss increases with the increase of radius ratio;2.43, 1.5 and 1.286 radius ratios. The temperature distribution of the inner pipe of the heat collector pipe is basically the same.