Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing
Journal article
Memon, S, Farukh, F and Kandan, K (2018). Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing. Applied Sciences. 8 (9), pp. 1705-1719. https://doi.org/10.3390/app8091705
| Authors | Memon, S, Farukh, F and Kandan, K |
|---|---|
| Abstract | Long-term durability of the vacuum edge-seal plays a significant part in retrofitting triple vacuum glazing (TVG) to existing buildings in achieving towards zero-energy buildings (ZEB) target. Vacuum pressure decrement with respect to time between panes affect 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 calculated to be 0.28 Wm−2K−1 and 0.94 Wm−2K−1 at the cavity vacuum pressure of 0.001 Pa. The results suggests 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−2K−1 and 0.94 Wm−2K−1 to 2.4 Wm−2K−1 and 2.58 Wm−2K−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. To 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, non-evaporable getters will maintain the cavity vacuum pressure that will enable the long-term durability to TVG. |
| Keywords | vacuum pressure; triple vacuum glazing; finite element modelling; thermal performance; towards zero-energy buildings |
| Year | 2018 |
| Journal | Applied Sciences |
| Journal citation | 8 (9), pp. 1705-1719 |
| Publisher | MDPI |
| ISSN | 2076-3417 |
| Digital Object Identifier (DOI) | https://doi.org/10.3390/app8091705 |
| Publication dates | |
| 19 Sep 2018 | |
| Publication process dates | |
| Deposited | 22 Sep 2018 |
| Accepted | 15 Sep 2018 |
| Publisher's version | License File Access Level Open |
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