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本文用全方向入射角修正系数K(θ,(?)),对入射辐射为任意方向时平面镜反射真空管集热器的方向特性进行了分析。用镜象法计算了主平面内的入射角修正系数K(θ,0)。讨论了影响方向特性的诸因素。K(θ,(?))可以用两个特定的入射角修正系数K(θ,0)和K(θ,π/2)作近似估算。全日效率可根据瞬时效率曲线和入射角修正系数K(θ,(?))计算,计算与实验的结果基本符合。
In this paper, the omni-directional incident angle correction coefficient K (θ, (?)) Is used to analyze the directional characteristics of planar mirror-reflecting vacuum tube collectors when the incident radiation is in any direction. The correction factor K (θ, 0) of incident angle in the principal plane is calculated by the image method. Discussed the factors that affect the directional characteristics. K (θ, (?)) Can be approximated by using two specific incident angle correction factors K (θ, 0) and K (θ, π / 2) Full-day efficiency can be calculated according to the instantaneous efficiency curve and incident angle correction coefficient K (θ, (?)), And the calculation basically agrees with the experimental result.