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首页> 外文期刊>International Journal of Heat and Mass Transfer >Corrected radiative cooling power measured by equivalent dissipative thermal reservoir method
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Corrected radiative cooling power measured by equivalent dissipative thermal reservoir method

机译：通过等效耗散热储层法测量校正的辐射冷却功率

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摘要

A radiative cooler is an optical device which can spontaneously preserve its temperature below ambient by simultaneously reflecting solar radiation and emitting thermal radiation through the atmospheric window lying within 8-13 μm of the electromagnetic spectrum. In the radiative cooling process, the universe acts as the ultimate heat sink for heat dissipation. Cooling power is a key indicator of the radiative cooling performance, which can reach a typical value of 100 W/m~2 under a clear sky. However, atmospheric transparency, which is usually hard to determine, affects the cooling power heavily. To fairly evaluate the cooling power under prescribed and controlled environmental conditions, we built an in-lab testing facility based on a hybrid refrigerative thermoelectric cooling system, which can artificially simulate the equivalent radiative cooling effect. We characterized the system performance and preserved the temperatures of the equivalent thermal reservoir at -19.9°C and -12.7°C steadily at ambient temperatures of 25°C and 45°C respectively. Under a reference atmospheric transmission spectrum featuring a high 8-13 μm transparency, we measure the cooling powers of a representative radiative cooler and compare them with the theoretical values for ambient temperatures between 25°C and 45°C. Measured cooling powers range from 108 W/m~2 to 141 W/m~2, which exceed the theoretical values by 17 - 33% due to excessive heat flow through the testing cavity and heat lost to the surroundings. The method can be extended to examine thermal and energy associated performances of derivative radiative cooling devices and systems.
机译：辐射冷却器是通过同时反射太阳辐射并通过在8-13μm的电磁频谱内的大气窗口发射热辐射来自发地保持其低于环境温度的光学装置。在辐射冷却过程中，宇宙充当散热的终极散热器。冷却功率是辐射冷却性能的关键指示，可以在晴空下达到100W / m〜2的典型值。然而，通常难以确定的大气透明度，大量影响了冷却功率。为了公平地评估规定和控制的环境条件下的冷却功率，我们基于混合制冷热电冷却系统建立了一个实验室测试设备，其可以人工模拟等效的辐射冷却效果。我们以分别在25°C和45℃的环境温度下稳定地，在-19.9°C和-12.7°C下稳定地，在-19.9°C和-12.7°C下保持了系统性能并保持了等效热贮存器的温度。在参考的大气传输光谱下，采用高8-13μm透明度，我们测量代表性辐射冷却器的冷却功率，并将它们与理论值进行比较，在25°C和45°C之间的环境温度。测量的冷却功率范围为108W / m〜2至141W / m〜2，由于通过测试腔和热量损失到周围环境的过热，因此超过理论值超过理论值17-33％。该方法可以扩展以检查衍生辐射冷却装置和系统的热和能量相关性能。

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