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Materials 2018, 11(7), 1166; https://doi.org/10.3390/ma11071166

The Effect of Radiative Cooling on Reducing the Temperature of Greenhouses

1
Department of Applied Chemistry, National Chia Yi University, Chiayi City 60004, Taiwan
2
Department of Biomechatronic Engineering, National Chia Yi University, Chiayi City 60004, Taiwan
*
Author to whom correspondence should be addressed.
Received: 25 May 2018 / Revised: 2 July 2018 / Accepted: 6 July 2018 / Published: 9 July 2018
(This article belongs to the Special Issue Selected Papers from IEEE ICASI 2018)
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Abstract

Currently, greenhouses are widely used for the cultivation of various crops. However, in tropical and subtropical regions, undesired near-infrared radiation (NIR) causes heat loads inside the greenhouse. Recent works have demonstrated that radiative cooling, releasing energy via radiative heat exchange where the heat is dumped directly into outer space, can be achieved by using silica particles designed to emit in the infrared atmospheric transparency window. The purpose of this study is to improve the plastic greenhouse cladding to regulate the temperature inside the greenhouse, mainly by passive cooling. Low-density-polyethylene (LDPE)-based formulations with anti-fogging agent, UV stabilizer, and silica particles were prepared by the melt blending technique and were formed into a double film by extrusion molding. Experimental results showed that under 35 °C ambient conditions, the inner temperature of the simulated greenhouse with the newly developed cladding was 4 to 5 °C less than that of the greenhouse with the commercial agricultural polyethylene (PE) film. View Full-Text
Keywords: covering material; passive cooling; near infrared radiation covering material; passive cooling; near infrared radiation
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Liu, C.-H.; Ay, C.; Kan, J.-C.; Lee, M.-T. The Effect of Radiative Cooling on Reducing the Temperature of Greenhouses. Materials 2018, 11, 1166.

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