Infrared reflector based on liquid crystal polymers and its impact on thermal comfort conditions in buildings

Khandelwal, Hitesh; Roberz, F; Loonen, Rcgm Roel; Hensen, Jlm Jan; Bastiaansen, Cees W. M.; Broer, Dirk J.; Debije, Michael G.; Schenning, Albert P. H. J.

doi:10.1117/12.2061851

Cited by 1 publication

(1 citation statement)

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“…Near-infrared (NIR) light, ranging from 700 to 2500 nm, makes up 50% of the total sunlight energy that reaches earth and is a significant interior heating source of buildings . Transmission and reflection of NIR from sunlight can be regulated by specialized windows, which can reduce energy consumption for heating and cooling of buildings while still being transparent for visible light. − Smart temperature-responsive IR reflectors autonomously regulate the temperature of indoor spaces . As IR radiation of shorter wavelengths is more strongly represented in sunlight than longer wavelengths, a window that shifts its reflection to a shorter wavelength upon heating rejects more IR at higher temperatures, which reduces heating of the indoor space.…”

Section: Introductionmentioning

confidence: 99%

Easily Processable Temperature-Responsive Infrared-Reflective Polymer Coatings

et al. 2017

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A temperature-responsive near-infrared reflective coating was fabricated based on a side-chain liquid crystal siloxane polymer using a simple wired-bar method. The cholesteric liquid crystalline polymer film showed a blue shift of the reflection band of ∼1000 nm in the IR region upon heating. The temperature-responsive change of the reflection band was reversible. Compared to that of the same mixture system in an alignment cell, the coating showed a significantly faster response. This research demonstrates an easy way to prepare a temperature-responsive IR-reflective coating that shifts its reflection to a shorter wavelength upon heating. As IR radiation of shorter wavelengths is more strongly represented in sunlight than longer wavelengths, this coating could be used to selectively reduce heating of an indoor space when the temperature is high. This is promising for the future application of smart climate control.

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