太阳能-热管呼吸阀的集热器系统的计算

Solution of Solar Energy Collector System in the Process of Exploitation of Solar Power-Heat Pipe Breather Valve

太阳能-热管呼吸阀,是解决呼吸阀冬季使用存在冻结问题的手段之一。集热器系统的设计是其中的重要组成部分。为了获取最大的太阳能量,必须保证集热器的采光面在正午垂直于太阳光线,从而得到集热器放置的最佳倾角为64.9°。进行集热器参数计算时,先假定平均板温TP和集热器面积Ab,算出总热损失系数,由集热器能量方程导出集热器面积的迭代值Ab′,与假设的面积值Ab进行迭代直到小于终止限0.01,可求出集热器的面积值Ab。由此计算肋片效率因子和集热器热迁移因子,根据公式可以得到一个新的板温TP′,比较TP′和TP,进行迭代,直到小于终止限。通过两次迭代计算得到集热器面积为0.011m2,平均板温为36℃。

Solar energy-heat pipe breather valve is one of means of solving the freeze in winter. The design of collector system is one of the important components. In order to get maximum solar energy, the condition that aperture plane of collector is perpendicular to sun rays at noontime must be sure, so that we can get the optimum tilt angle 64.9°at that the collector is set. Before doing the collector parametric computation, we supposed mean plate temperature TP and collector area Ab, calculating all heat loss factor by them, then iteration value Ab of collector area is derived by collector energy equation and supposed area Ab is iterated till the value is less than termination limit 0.01. Based on this value, we calculate efficiency factor of rib chip and migration factor of collector, and got a new plate temperature TP′. Comparing TP′ with TP, iteration is kept on till the value being less than terminate limit. By twice iterative computations we can get that the collector area is 0.011 m2, mean plate temperature is 36 ℃.