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Temperature diurnal change of walls and the effect on modeling urban thermal anisotropy

机译：墙壁温度差变化及对城市热各向异性建模的影响

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Voogt [J. A. Voogt, “Assessment of an Urban Sensor View Model for thermal anisotropy,” Remote Sensing of Environment, vol. 112, pp. 482–495, 2008.] assessed the surface-sensor-sun relations model (SUM) of thermal anisotropy. The results of that assessment suggested that there is a general tendency to underestimate overall thermal anisotropy. This paper focuses on the effects of wall direction on urban thermal anisotropy. Field experiments were conducted in Beijing. One experiment used several fixed infrared thermometers to record the diurnal temperature change on the south, north, east, and west walls as well as the roof of a building. Another experiment observed directional radiance and building component temperature using an urban scale model with different geometrical viewing conditions. Two component-dividing patterns were then employed to simulate urban thermal anisotropy using SUM model: Pattern I does not consider wall direction, whereas Pattern II divides walls into south-, north-, east-, and west-facing walls. The results show that there are obvious temperature differences among the differently facing walls. Pattern I has a tendency to underestimate the directional temperature. While Pattern II can rectify this underestimation and can simulate urban thermal anisotropy with improved accuracy. The above findings underscore the importance of wall direction in urban thermal anisotropy, especially for areas with sparse buildings, and, to some extent, explain the main reason of underestimation suggested by Voogt.
机译：voogt [J. A. Voogt，“评估城市传感器视图模型，热四分子术”，遥感环境，Vol。 112，第482-495,2008.]评估了热各向异性的表面传感器 - 太阳关系模型（和）。该评估的结果表明，普遍倾向于低估了整体热各向异性。本文重点介绍了墙体方向对城市热各向异性的影响。现场实验在北京进行。一项实验使用了几种固定的红外温度计，以记录南部，北，东部和西墙以及建筑物屋顶上的昼夜温度变化。另一个实验观察了使用不同几何观察条件的城市规模模型的方向辐射和建筑部件温度。然后采用两个组分分割模式来模拟城市热各向异性使用SUM模型：图案我不考虑墙体方向，而图案II将墙体划分为南，北，东部和西部的墙壁。结果表明，不同面对面的墙壁之间存在明显的温度差异。图案I具有低估定向温度的趋势。虽然图案II可以纠正这种低估，并且可以通过改善的精度来模拟城市热各向异性。上述研究结果强调了城市热各向异性在城市热各向异性中的重要性，特别是对于稀疏建筑物的区域，并且在一定程度上解释了voogt表达低估的主要原因。

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