Evacuated glazing with tempered glass

Yueping Fang; Farid Arya

doi:10.1016/j.solener.2019.03.021

Evacuated glazing with tempered glass

Yueping Fang, Farid Arya

School of Energy, Construction and Environment

Ulster University

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

232 Downloads (Pure)

Abstract

The application of tempered glass has made it possible to significantly reduce the support pillar number within evacuated glazing (EG) since tempered glass (T-glass) is four to ten times mechanically stronger than annealed glass (A-glass). The thermal transmittance (U-value) of 0.4 m by 0.4 m double evacuated glazing (DEG) with 4 mm thick T-glass and A-glass panes with emittance of 0.03 were determined to be 0.3 Wm-2K-1 and 0.57 Wm-2K-1, respectively (47.4% improvement) using previously experimentally validated finite volume model. The thermal transmittance (U-value) of 0.4 m by 0.4 m triple evacuated glazing (TEG) with 4 mm thick T-glass and A-glass panes with emittance of 0.03 were determined to be 0.11 Wm-2K-1 and 0.28 Wm-2K-1, respectively (60.7% improvement). The improvement in the U-value of EG with T-glass is due to a reduction in support pillar number, leading to reduction in heat conduction through pillar array. The impact of tempered glass on the thermal transmittance for TEG is greater than that of DEG since radiative heat transfer in TEG is much lower than that in DEG, thus the reduction in heat conduction resulted from the reduction of support pillar number in TEG is much larger than that in DEG.

Original language	English
Pages (from-to)	240-247
Number of pages	8
Journal	Solar Energy
Volume	183
Early online date	12 Mar 2019
DOIs	https://doi.org/10.1016/j.solener.2019.03.021
Publication status	Published - 1 May 2019

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Solar Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solar Energy, [183], (2019)] DOI: 10.1016/j.solener.2019.03.021

© 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Funder

Pump-prime project, Coventry University

Keywords

Evacuated glazing
tempered glass
annealed glass
thermal performance
support pillars

ASJC Scopus subject areas

Energy(all)
Engineering(all)

Access to Document

10.1016/j.solener.2019.03.021

Post-PrintAccepted author manuscript, 4.66 MBLicence: CC BY-NC-ND

Yueping Fang
- School of Energy, Construction and Environment - Assistant Professor Academic
Person: Teaching and Research

Cite this

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title = "Evacuated glazing with tempered glass",

abstract = "The application of tempered glass has made it possible to significantly reduce the support pillar number within evacuated glazing (EG) since tempered glass (T-glass) is four to ten times mechanically stronger than annealed glass (A-glass). The thermal transmittance (U-value) of 0.4 m by 0.4 m double evacuated glazing (DEG) with 4 mm thick T-glass and A-glass panes with emittance of 0.03 were determined to be 0.3 Wm-2K-1 and 0.57 Wm-2K-1, respectively (47.4% improvement) using previously experimentally validated finite volume model. The thermal transmittance (U-value) of 0.4 m by 0.4 m triple evacuated glazing (TEG) with 4 mm thick T-glass and A-glass panes with emittance of 0.03 were determined to be 0.11 Wm-2K-1 and 0.28 Wm-2K-1, respectively (60.7% improvement). The improvement in the U-value of EG with T-glass is due to a reduction in support pillar number, leading to reduction in heat conduction through pillar array. The impact of tempered glass on the thermal transmittance for TEG is greater than that of DEG since radiative heat transfer in TEG is much lower than that in DEG, thus the reduction in heat conduction resulted from the reduction of support pillar number in TEG is much larger than that in DEG.",

keywords = "Evacuated glazing, tempered glass, annealed glass, thermal performance, support pillars",

author = "Yueping Fang and Farid Arya",

note = "NOTICE: this is the author{\textquoteright}s version of a work that was accepted for publication in Solar Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solar Energy, [183], (2019)] DOI: 10.1016/j.solener.2019.03.021 {\textcopyright} 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ ",

year = "2019",

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doi = "10.1016/j.solener.2019.03.021",

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AU - Fang, Yueping

AU - Arya, Farid

N1 - NOTICE: this is the author’s version of a work that was accepted for publication in Solar Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solar Energy, [183], (2019)] DOI: 10.1016/j.solener.2019.03.021 © 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

PY - 2019/5/1

Y1 - 2019/5/1

N2 - The application of tempered glass has made it possible to significantly reduce the support pillar number within evacuated glazing (EG) since tempered glass (T-glass) is four to ten times mechanically stronger than annealed glass (A-glass). The thermal transmittance (U-value) of 0.4 m by 0.4 m double evacuated glazing (DEG) with 4 mm thick T-glass and A-glass panes with emittance of 0.03 were determined to be 0.3 Wm-2K-1 and 0.57 Wm-2K-1, respectively (47.4% improvement) using previously experimentally validated finite volume model. The thermal transmittance (U-value) of 0.4 m by 0.4 m triple evacuated glazing (TEG) with 4 mm thick T-glass and A-glass panes with emittance of 0.03 were determined to be 0.11 Wm-2K-1 and 0.28 Wm-2K-1, respectively (60.7% improvement). The improvement in the U-value of EG with T-glass is due to a reduction in support pillar number, leading to reduction in heat conduction through pillar array. The impact of tempered glass on the thermal transmittance for TEG is greater than that of DEG since radiative heat transfer in TEG is much lower than that in DEG, thus the reduction in heat conduction resulted from the reduction of support pillar number in TEG is much larger than that in DEG.

AB - The application of tempered glass has made it possible to significantly reduce the support pillar number within evacuated glazing (EG) since tempered glass (T-glass) is four to ten times mechanically stronger than annealed glass (A-glass). The thermal transmittance (U-value) of 0.4 m by 0.4 m double evacuated glazing (DEG) with 4 mm thick T-glass and A-glass panes with emittance of 0.03 were determined to be 0.3 Wm-2K-1 and 0.57 Wm-2K-1, respectively (47.4% improvement) using previously experimentally validated finite volume model. The thermal transmittance (U-value) of 0.4 m by 0.4 m triple evacuated glazing (TEG) with 4 mm thick T-glass and A-glass panes with emittance of 0.03 were determined to be 0.11 Wm-2K-1 and 0.28 Wm-2K-1, respectively (60.7% improvement). The improvement in the U-value of EG with T-glass is due to a reduction in support pillar number, leading to reduction in heat conduction through pillar array. The impact of tempered glass on the thermal transmittance for TEG is greater than that of DEG since radiative heat transfer in TEG is much lower than that in DEG, thus the reduction in heat conduction resulted from the reduction of support pillar number in TEG is much larger than that in DEG.

KW - Evacuated glazing

KW - tempered glass

KW - annealed glass

KW - thermal performance

KW - support pillars

U2 - 10.1016/j.solener.2019.03.021

DO - 10.1016/j.solener.2019.03.021

M3 - Article

SN - 0038-092X

VL - 183

SP - 240

EP - 247

JO - Solar Energy

JF - Solar Energy

ER -

Evacuated glazing with tempered glass

Abstract

Bibliographical note

Funder

Keywords

ASJC Scopus subject areas

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Yueping Fang

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