Emplacement of screen-printed graphene oxide coating for building thermal comfort discernment

Anurag Roy,Senthilarasu Sundaram,Tapas K Mallick,Aritra Ghosh,David Benson

doi:10.1038/s41598-020-72670-8

Anurag Roy, Senthilarasu Sundaram + Show 3 more

Open Access

https://doi.org/10.1038/s41598-020-72670-8

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Journal: Scientific Reports	Publication Date: Sep 23, 2020
Citations: 12	License type: open-access

Affiliation: University of Exeter

Abstract

This study demonstrates the development of flexible graphene oxide coatings (GOCs) by the screen-printed technique and further its implementation as a thermal absorber for buildings’ thermal comfort purpose. The basic concept consists the integration of the GOC as a flat absorber on the top of a low iron glass or aluminium-based substrate (5 × 5 cm2) connecting through a phase change material channel in contact with direct sun exposure. The function of GOC as an outdoor cover of the prototype chamber is to maintain the high indoor temperature while the outdoor temperature is low. Using the GOC, it has been observed that the indoor temperature (at the substrate) of the prototype chamber always remains higher as compared to the outdoor temperature (at the GOC) as measured under 1 SUN 1.5 AM condition. The temperature difference between outdoor and indoor exterior surface significantly increases during the light exposure time, whereas the difference drastically approaches to zero during the cooling period. The variation of different crucial environmental factors such as high temperature, moisture, flexibility and water resistivity has been investigated on the developed GOCs to understand the stability of the coating further.

Highlights

This study demonstrates the development of flexible graphene oxide coatings (GOCs) by the screenprinted technique and further its implementation as a thermal absorber for buildings’ thermal comfort purpose
In order to monitor the high-temperature resistive effect, the integration of the GOC as a flat absorber strip on the top of a glass or aluminium (Al) substrate connecting through a phase change material (PCM) channel was further executed in contact with direct sun exposure
A novel graphene oxide coating (GOC) has been developed by screen-printing technique, which plays a crucial role in improving the thermal comfort and thermal stability along with the water-resistance performance

Summary

Introduction

This study demonstrates the development of flexible graphene oxide coatings (GOCs) by the screenprinted technique and further its implementation as a thermal absorber for buildings’ thermal comfort purpose. The variation of different crucial environmental factors such as high temperature, moisture, flexibility and water resistivity has been investigated on the developed GOCs to understand the stability of the coating further. Using sensible heat storage-based building envelope as thermal mass or inertia, this temperature fluctuation was reduced, which is not efficient. At the same time, during the phase transition stage, the leakage of PCM affects the system, which limits its further use This low thermal conductivity of PCM, which can be improved by using nanoparticle incorporation[12,13]. Still the critical challenges for solar absorber coating to be applied for large-scale applications At this scenario, light-weighted, flexible, and higher specific heat capacity and a better thermal conductive material is required. GO can be mixed with different polymers and other materials in order to enhance the properties of composite materials like tensile strength, elasticity, conductivity, and so on

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