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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

DAYTIME RADIATIVE COOLING WITH POLYMER COATINGS

Tawadud AlKatheeri
Department of Mechanical and Materials Engineering, Masdar Institute, Khalifa University of Science and Technology, P.O. Box 54224, Abu Dhabi, UAE

Aikifa Raza
Department of Mechanical and Materials Engineering, Masdar Institute, Khalifa University of Science and Technology, P.O. Box 54224, Abu Dhabi, UAE

Jin You Lu
Department of Mechanical and Materials Engineering, Masdar Institute, Khalifa University of Science and Technology, P.O. Box 54224, Abu Dhabi, UAE

TieJun Zhang
Department of Mechanical and Materials Engineering, Masdar Institute, Khalifa University of Science and Technology, P.O. Box 54224, Abu Dhabi, UAE

DOI: 10.1615/IHTC16.rti.023117
pages 8307-8312


KEY WORDS: Radiative cooling, Polymer coatings, Sunlight reflection, Broadband IR emission

Abstract

Cooling is a significant end-use of energy and a major driver of peak electricity demand in hot-climate countries. In contrast to traditional cooling methods that require power and bulky equipment to carry heat away, radiative cooling is a passive and natural way of cooling on the earth. Recently, passive cooling using selective reflectors and emitters have attracted worldwide attention. These radiative cooling devices demonstrate great potential owing to their ability in reflecting the majority of incident solar radiation while maintaining strong emissivity in the mid infra-red wavelength range. In this work, a scalable polymer coating is developed to efficiently radiate heat to the outer space through an atmospheric transparency window between 8-13 μm (1300-800 cm-1). The proposed polymer coating on a reflective metallic layer exhibits near-perfect IR emissivity and good daytime radiative cooling capability, while conventional polymer coating absorbs sunlight in very wide spectrum. The proposed radiative cooling coating shows more than 90% reflectance of the solar spectrum with resistance to UV radiation. Roof-top experiments and radiative cooling analysis are performed to evaluate radiative cooling performance is designed and fabricated to quantify the power during daytime. Preliminary results confirm that the proposed radiative approach is promising and cost-effective for large-scale and energy-efficient cooling applications.

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