太阳能空气集热器(Ⅰ型)的数学模型研究

A NUMERICAL STUDY ON SOLAR AIR HEATER(TYPE I)

用数学模型化方法研究了太阳能空气集热器的集热传热性能。建立了基于二维假设下的流体流动和热量传递的稳态数学模型，并用有限差分法进行数值求解，计算得到稳态下太阳能空气集热器的速度、温度分布图以及集热效率与空气流量、入口空气温度、入射太阳辐照度和表面盖板透过率的关系。结果表明，对Ｉ型太阳能空气集热器，集热效率随空气流量和表面盖板透过率的增加而增大，随入口空气温度和入射太阳辐照度的增大而减小。计算结果与实验结果吻合很好。

A numerical study is devoted to the thermal performance of solar air heater(type I).A steady state mathematical model of fluid flow and heat transfer based on two dimensional asssumptions was set up at first,and then numerical solution was brought out by finite difference method,thus,streamlines,temperature distribution and collection efficiency were obtained.It is discovered that collection efficiency of type I solar air heater increases with increasiny of air flow rate and transmissivity ratio of the glazing plate,and with decreasing temperature of inlet air and intensity of incident solar radiation.Calculation results are in good agreement with experimental one.