精确量化辐射冷却潜力：基于透射率近似的温度修正
Accurately Quantifying Radiative Cooling Potentials: A Temperature-correction to the Transmittance-based approximation
摘要：
辐射制冷材料制冷潜力的理论计算对于确定其在不同气象条件下的制冷能力和评估其性能至关重要。为了实现这些计算，需要长波红外下降流大气辐照度的精确模型，然而，广泛用于确定辐射冷却潜力的基于透射率的余弦近似并不考虑由热损失到大气本身的较冷区域所产生的冷却潜力。在这里，我们表明，使用的近似可能会导致> 10%的低估相对于MODTRAN 6输出的冷却潜力。我们提出了一个温度校正的透射率为基础的近似占冷高层大气的热损失，并显着减少这种低估，同时保留了原来的模型的优点。鉴于基于透射率的模型的广泛和持续使用，我们的研究结果突出了潜在错误的重要来源和纠正错误的方法。
英文摘要：
Theoretical calculations of the cooling potential of radiative cooling materials are crucial for determining their cooling capability under different meteorological conditions and evaluating their performance. To enable these calculations, accurate models of long-wave infrared downwelling atmospheric irradiance are needed, However, the transmittance-based cosine approximation, which is widely used to determine radiative cooling potentials, does not account for the cooling potential arising from heat loss to the colder reaches of the atmosphere itself. Here, we show that use of the approximation can lead to > 10% underestimation of the cooling potential relative to MODTRAN 6 outputs. We propose a temperature correction to the transmittance-based approximation which accounts for heat loss to the cold upper atmosphere, and significantly reduces this underestimation, while retaining the advantages of the original model. In light of the widespread and continued use of the transmittance-based model, our results highlight an important source of potential errors and a means to correct for them.
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