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A new study on passive radiative sky cooling resource maps of China

机译：中国被动辐射天空冷却资源地图的新研究

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Passive radiative cooling utilizes atmospheric transparency window (8?13 ?m) to discharge heat into outer space and inhibits solar absorption. Recently, due to the rapid development of daytime radiative cooling materials synthesized at micro or nano scales, radiative cooling has attracted substantial attention due to its energy-saving potential without generating carbon emissions. This study newly explores radiative cooling resources across China by using the radiative cooling model and extensive meteorological data retrieval. Temporal and spatial variability characteristics of cooling power across seven geographic regions of China are comprehensively analyzed. In particular, the annual, seasonal and daily variations of radiative cooling resources are given in detail. The influence of the spectral properties from different radiative coolers on the cooling potential is clarified. The annual maximum cooling potential is between 36.7 and 71.9 W/m2, among which the humid region of South China demonstrates the lowest cooling power with an average of 48.8 W/m2. In comparison, Northwest China with comparatively dry climate shows the cooling power of 60.1 W/m2 on average. Seasonal distribution of radiative cooling resources varies discrepantly. The cooling power in spring, summer, autumn and winter deviates + 4.02%, -7.22%, -0.34% and + 3.6% from that of annual average, respectively. South China has the lowest cooling potential in all seasons, especially in summer when the net cooling power below 50 W/m2 accounts for the largest geographic share of 42%. In 38.51% of China, the cooling power during the daytime is higher than 60 W/m2, and the ratio at night is reduced to 10.87%. Compared with the ideal broadband cooler, due to the uneven regional distribution of solar radiation, a practical radiative cooler with the solar absorption of 4% and an inferior nonblackbody thermal emittance reduces the annual net cooling power of 15.4% on average. In addition, the practical cooler shows the nighttime cooling power of 24.8% higher than that of the daytime. Finally, a radiative cooling potential-based regional division map is newly displayed, which provides a clear picture for the deployment of radiative cooling technology in China.
机译：被动辐射冷却利用大气透明窗口（8？13Ωm）将热量放入外部空间并抑制太阳能吸收。最近，由于在微型或纳米鳞片合成的白天辐射冷却材料的快速发展，由于其节能潜力而不产生碳排放，辐射冷却引起了大量的关注。本研究通过利用辐射冷却模型和广泛的气象数据检索，新近探讨了中国的辐射冷却资源。全面分析了中国七个地理区域的冷却功率的时间和空间可变性特性。特别是，详细给出了辐射冷却资源的年度，季节和日常变化。阐明了光谱性质从不同辐射冷却器对冷却电位的影响。年度最大冷却潜力在36.7和71.9 W / M2之间，其中南华潮湿地区展示了最低的冷却功率，平均为48.8W / m 2。相比之下，中国西北地区具有相对干燥的气候，平均展示了60.1W / m2的冷却功率。辐射冷却资源的季节性分布差异很大。春季，夏季，秋季和冬季的冷却能力分别偏离了+ 4.02％，-7.22％，-0.34％和+ 3.6％，+ 3.6％。南方在所有季节都有最低的冷却潜力，特别是在夏季，净冷却功率低于50 W / M2的账户最大的地理份额为42％。在38.51％的中国，白天的冷却功率高于60瓦/平方米，夜间的比例降至10.87％。与理想的宽带冷却器相比，由于太阳辐射的区域分布不均匀，太阳能吸收的实用辐射冷却器为4％，下劣质非白炽灯热膨胀率降低了平均每年净冷却功率为15.4％。此外，实用的冷却器显示夜间冷却功率高于白天的24.8％。最后，新显示了一种辐射冷却潜在的区域划分地图，为中国散热冷却技术部署提供了清晰的画面。

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