Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing

Saim Memon; Farukh Farukh; Karthikeyan Kandan

doi:10.3390/app8091705

Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing

Saim Memon, Farukh Farukh, Karthikeyan Kandan

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

10 Citations (Scopus)

Abstract

Long-term durability of the vacuum edge seal plays a significant part in retrofitting triple vacuum glazing (TVG) to existing buildings in achieving progress towards a zero-energy building (ZEB) target. Vacuum pressure decrement with respect to time between panes affects the thermal efficiency of TVG. This study reports a 3D finite element model, with validated mathematical methods and comparison, for the assessment of the influence of vacuum pressure diminution on the thermal transmittance (U value) of TVG. The centre-of-pane and total U values of TVG are calculated to be 0.28 Wm^-2 K^-1 and 0.94 Wm^-2 K^-1 at the cavity vacuum pressure of 0.001 Pa. The results suggest that a rise in cavity pressure from 0.001 Pa to 100 kPa increases the centre-of-pane and total U values from 0.28 Wm^-2 K^-1 and 0.94 Wm^-2 K^-1 to 2.4 Wm^-2 K^-1 and 2.58 Wm^-2 K^-1, respectively. The temperature descent on the surfaces of TVG between hot and cold sides increases by decreasing the cavity vacuum pressure from 50 kPa to 0.001 Pa. Nonevaporable getters will maintain the cavity vacuum pressure of 0.001 Pa for over 20 years of life span in the cavity of 10-mm wide edge-sealed triple vacuum glazing, and enable the long-term durability of TVG.

Original language	English
Article number	1705
Number of pages	15
Journal	Applied Sciences (Switzerland)
Volume	8
Issue number	9
DOIs	https://doi.org/10.3390/app8091705
Publication status	Published - 19 Sep 2018
Externally published	Yes

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title = "Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing",

abstract = "Long-term durability of the vacuum edge seal plays a significant part in retrofitting triple vacuum glazing (TVG) to existing buildings in achieving progress towards a zero-energy building (ZEB) target. Vacuum pressure decrement with respect to time between panes affects the thermal efficiency of TVG. This study reports a 3D finite element model, with validated mathematical methods and comparison, for the assessment of the influence of vacuum pressure diminution on the thermal transmittance (U value) of TVG. The centre-of-pane and total U values of TVG are calculated to be 0.28 Wm-2 K-1 and 0.94 Wm-2 K-1 at the cavity vacuum pressure of 0.001 Pa. The results suggest that a rise in cavity pressure from 0.001 Pa to 100 kPa increases the centre-of-pane and total U values from 0.28 Wm-2 K-1 and 0.94 Wm-2 K-1 to 2.4 Wm-2 K-1 and 2.58 Wm-2 K-1, respectively. The temperature descent on the surfaces of TVG between hot and cold sides increases by decreasing the cavity vacuum pressure from 50 kPa to 0.001 Pa. Nonevaporable getters will maintain the cavity vacuum pressure of 0.001 Pa for over 20 years of life span in the cavity of 10-mm wide edge-sealed triple vacuum glazing, and enable the long-term durability of TVG.",

keywords = "Finite element modelling, Thermal performance, Towards zero-energy buildings, Triple vacuum glazing, Vacuum pressure",

author = "Saim Memon and Farukh Farukh and Karthikeyan Kandan",

note = "Funding Information: Funding: This research received no external funding and The APC was funded by London South Bank University. Funding Information: Acknowledgments: This work supported by the self-initiated research collaboration between London South Bank University, UK, and De Montfort University, UK. Authors would like to thank the reviewers and editors for their suggestions. Publisher Copyright: {\textcopyright} 2018 by the authors.",

year = "2018",

month = sep,

day = "19",

doi = "10.3390/app8091705",

language = "English",

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AU - Memon, Saim

AU - Farukh, Farukh

AU - Kandan, Karthikeyan

N1 - Funding Information: Funding: This research received no external funding and The APC was funded by London South Bank University. Funding Information: Acknowledgments: This work supported by the self-initiated research collaboration between London South Bank University, UK, and De Montfort University, UK. Authors would like to thank the reviewers and editors for their suggestions. Publisher Copyright: © 2018 by the authors.

PY - 2018/9/19

Y1 - 2018/9/19

N2 - Long-term durability of the vacuum edge seal plays a significant part in retrofitting triple vacuum glazing (TVG) to existing buildings in achieving progress towards a zero-energy building (ZEB) target. Vacuum pressure decrement with respect to time between panes affects the thermal efficiency of TVG. This study reports a 3D finite element model, with validated mathematical methods and comparison, for the assessment of the influence of vacuum pressure diminution on the thermal transmittance (U value) of TVG. The centre-of-pane and total U values of TVG are calculated to be 0.28 Wm-2 K-1 and 0.94 Wm-2 K-1 at the cavity vacuum pressure of 0.001 Pa. The results suggest that a rise in cavity pressure from 0.001 Pa to 100 kPa increases the centre-of-pane and total U values from 0.28 Wm-2 K-1 and 0.94 Wm-2 K-1 to 2.4 Wm-2 K-1 and 2.58 Wm-2 K-1, respectively. The temperature descent on the surfaces of TVG between hot and cold sides increases by decreasing the cavity vacuum pressure from 50 kPa to 0.001 Pa. Nonevaporable getters will maintain the cavity vacuum pressure of 0.001 Pa for over 20 years of life span in the cavity of 10-mm wide edge-sealed triple vacuum glazing, and enable the long-term durability of TVG.

AB - Long-term durability of the vacuum edge seal plays a significant part in retrofitting triple vacuum glazing (TVG) to existing buildings in achieving progress towards a zero-energy building (ZEB) target. Vacuum pressure decrement with respect to time between panes affects the thermal efficiency of TVG. This study reports a 3D finite element model, with validated mathematical methods and comparison, for the assessment of the influence of vacuum pressure diminution on the thermal transmittance (U value) of TVG. The centre-of-pane and total U values of TVG are calculated to be 0.28 Wm-2 K-1 and 0.94 Wm-2 K-1 at the cavity vacuum pressure of 0.001 Pa. The results suggest that a rise in cavity pressure from 0.001 Pa to 100 kPa increases the centre-of-pane and total U values from 0.28 Wm-2 K-1 and 0.94 Wm-2 K-1 to 2.4 Wm-2 K-1 and 2.58 Wm-2 K-1, respectively. The temperature descent on the surfaces of TVG between hot and cold sides increases by decreasing the cavity vacuum pressure from 50 kPa to 0.001 Pa. Nonevaporable getters will maintain the cavity vacuum pressure of 0.001 Pa for over 20 years of life span in the cavity of 10-mm wide edge-sealed triple vacuum glazing, and enable the long-term durability of TVG.

KW - Finite element modelling

KW - Thermal performance

KW - Towards zero-energy buildings

KW - Triple vacuum glazing

KW - Vacuum pressure

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ER -

Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing

Abstract

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