Evacuated glazing with tempered glass

Yueping Fang, Farid Arya

Research output: Contribution to journalArticle

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 −2 K −1 and 0.57 Wm −2 K −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 −2 K −1 and 0.28 Wm −2 K −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.

LanguageEnglish
Article number183
Pages240-247
Number of pages8
JournalSolar Energy
Volume183
Issue number183 (2019) 240-247
Early online date12 Mar 2019
DOIs
Publication statusPublished - 1 May 2019

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Glass
Heat conduction
Heat transfer
Hot Temperature

Keywords

  • Annealed glass
  • Evacuated glazing
  • Tempered Glass
  • Thermal performance
  • Support Pillar
  • Annealed glass (A-glass)
  • Support pillars
  • Tempered glass (T-glass)

Cite this

Fang, Yueping ; Arya, Farid. / Evacuated glazing with tempered glass. 2019 ; Vol. 183, No. 183 (2019) 240-247. pp. 240-247.
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Fang, Y & Arya, F 2019, 'Evacuated glazing with tempered glass', vol. 183, no. 183 (2019) 240-247, 183, pp. 240-247. https://doi.org/10.1016/j.solener.2019.03.021

Evacuated glazing with tempered glass. / Fang, Yueping; Arya, Farid.

Vol. 183, No. 183 (2019) 240-247, 183, 01.05.2019, p. 240-247.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Evacuated glazing with tempered glass

AU - Fang, Yueping

AU - Arya, Farid

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 −2 K −1 and 0.57 Wm −2 K −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 −2 K −1 and 0.28 Wm −2 K −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 −2 K −1 and 0.57 Wm −2 K −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 −2 K −1 and 0.28 Wm −2 K −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 - Annealed glass

KW - Evacuated glazing

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KW - Support Pillar

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KW - Support pillars

KW - Tempered glass (T-glass)

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ER -