平板太阳集热器列阵的二维模型与热性能

FLOW DISTRIBUTION AND THERMAL PERFORMANCE OF FLAT PLATE COLLECTOR ARRAYS

本文分析了管板式太阳集热器列阵的流动与传热。考虑了支管流量分布不均匀、吸热板二维导热及浮升力等因素,建立了离散型的二维数学模型,求得了数值解。计算结果表明,集热器列阵的布置方式和支管流量分布的均匀性对列阵的热性能有很大的影响。逆流布置(U型)的列阵由于流动的短路现象而使热效率明显降低。计算所得的数值结果与实验结果符合良好。

In this paper, a new descrete numerical model is built for flat plate collector arrays. The flow nonuniformity, two dimensional heat conduction and buoyancy effects are considered in the analysis. The numerical results are found in agreement with the experim-ental data. It is found that the flow distributicn gives great effect on the thermal performance of the collector arrays.