Abstract We study emissivity (e)-dependent radiative heat transfer phenomena in remote and contact configurations. To demonstrate the emissivity-dependent radiative heating mode in a remote configuration, we fabricated miniature greenhouses covered with low (0.34)- and high-e (0.86) polyethylene films and monitored temperatures on the floors, insides, and covers of the greenhouses during 24 h. The high-e greenhouse yielded a 9-°C increase in floor temperature relative to the low-e greenhouse at a one-sun solar irradiance because the high-e film effectively trapped floor radiation. In contrast, the cover temperature remained lower in the high-e greenhouse due to intensified radiation released from the high-e film. This self-cooling effect was more evident when an emissive film was in physical contact with an object. While bare copper heated up to 55 °C, a high-e film coated copper substrate was kept cooler by 4 and 2 °C compared with the bare and low-e film coated copper samples, respectively.

中文翻译：

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使用热辐射膜切换加热和冷却模式

摘要 我们研究了远程和接触配置中与发射率 (e) 相关的辐射传热现象。为了在远程配置中展示依赖于发射率的辐射加热模式，我们制造了覆盖有低 (0.34) 和高 e (0.86) 聚乙烯薄膜的微型温室，并在 24 年期间监测了温室地板、内部和覆盖物的温度。 H。在单太阳辐照度下，高辐射温室使地板温度比低辐射温室高 9°C，因为高辐射薄膜有效地捕获了地板辐射。相比之下，由于高辐射膜释放的辐射增强，高辐射温室的覆盖温度保持较低。当发光膜与物体发生物理接触时，这种自冷却效应更加明显。