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Open AccessArticle

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

1
Centre for Advanced Materials, School of Engineering, London South Bank University, 103 Borough Road, London SE1 0AA, UK
2
Centre for Engineering Science and Advanced Systems, School of Engineering and Sustainable Development, De Montfort University, The Gateway, Leicester LU1 9BH, UK
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(9), 1705; https://doi.org/10.3390/app8091705
Received: 22 August 2018 / Revised: 10 September 2018 / Accepted: 15 September 2018 / Published: 19 September 2018
(This article belongs to the Special Issue Zero-Energy Buildings)
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. View Full-Text
Keywords: vacuum pressure; triple vacuum glazing; finite element modelling; thermal performance; towards zero-energy buildings vacuum pressure; triple vacuum glazing; finite element modelling; thermal performance; towards zero-energy buildings
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Memon, S.; Farukh, F.; Kandan, K. Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing. Appl. Sci. 2018, 8, 1705.

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