Triple vacuum glazing: Heat transfer and basic mechanical design constraints

Manz, Heinrich; Brunner, Samuel; Wullschleger, L.

doi:10.1016/j.solener.2005.11.003

Cited by 99 publications

(58 citation statements)

References 14 publications

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“…The G value was predicted to be 0.71. It was predicted in (Manz et al, 2006 andFang et al, 2010) and demonstrated here that the glazing size, due to edge effects, influences the total U-value. A typical cold side isotherm of the model is shown in Fig 3a and the temperature distribution across support pillars is shown in Fig.…”

Section: Thermal Performance Predictionssupporting

confidence: 55%

Design, Development and Thermal Performance Analysis of Ultra-Low Heat Loss Triple Vacuum Glazing

Memon¹

2017

Proceedings of SWC2017/SHC2017

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Heat loss through windows of buildings is one of the significant causes of high-energy consumption that require intervention to advance their thermal performance in a move towards net-zero energy buildings. Highperformance triple vacuum glazing features ultra-low heat loss that maintains the transparency, regardless of tiny pillar spots, and slimness due to its narrow evacuated cavities. This study reports the design and development of high-vacuum system with the modified vacuum cup which provides an effective pump-out hole sealing and has an achievable vacuum pressure of 4.02x10 -5 Pa. A new dual-edge seal (low temperature melt 186˚C) consists of Cerasolzer CS186 alloy as a main and J-B Weld epoxy steel adhesive as a support seal is developed and the triple vacuum glazing (area of 300 x 300mm) samples are fabricated, in which the vacuum pressure of 4.8x10 -2 Pa is achieved. A 3D FEM of the fabricated triple vacuum glazed is developed and the centre-of-pane and overall U-value of 0.33Wm -2 K -1 and 1.05 Wm , respectively, are predicted.

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Section: Thermal Performance Predictionssupporting

confidence: 55%

Design, Development and Thermal Performance Analysis of Ultra-Low Heat Loss Triple Vacuum Glazing

Memon¹

2017

Proceedings of SWC2017/SHC2017

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“…Manz et al [28] predicted a centre-of-pane thermal transmittance value of less than 0.2 Wm -2 K -1 , for a triple vacuum glazing made with 6 mm, 4 mm and 6 mm thick glass sheets and four low-emittance coatings with emittance of 0.03. Comparing this with the current simulated centre-of-pane thermal transmittance, the increase of 0.13 Wm -2 K -1 was due to the use of tin-oxide coatings with an emittance of 0.15 on three internal surfaces and the use of three 4 mm-thick glass sheets.…”

Section: Predicted Thermal Performancementioning

confidence: 99%

A new low-temperature hermetic composite edge seal for the fabrication of triple vacuum glazing

Memon

Farukh

Eames

et al. 2015

Vacuum

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Please cite this article as: Memon S, Farukh F, Eames PC, Silberschmidt VV, A new low-temperature hermetic composite edge seal for the fabrication of triple vacuum glazing, Vaccum (2015Vaccum ( ), doi: 10.1016Vaccum ( / j.vacuum.2015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 2 AbstractHigh performance low-cost vacuum glazing is a key development in the move to more energy-efficient buildings. This study reports the results of experimental and theoretical investigations into the development of a new low-temperature (less than 200˚C) composite edge seal. A prototype triple vacuum glazing of dimensions 300mmx300mm was fabricated with a measured vacuum pressure of 4.8x10 -2 Pa achieved. A three-dimensional finite-element model for this prototype triple vacuum glazing with the composite edge seal was also developed. Centre-of-pane and total thermal transmittance values for this small prototype of the triple vacuum glazing were predicted to be 0.33 Wm -2 K -1 and 1.05 Wm -2 K -1 , respectively. It was predicted using the developed model that the thermal performance could be improved by reducing the width of the composite edge seal and by the use of soft low-emissivity coatings on the glass surfaces. Detailed three-dimensional isothermal contour plots of the modelled triple vacuum glazing are presented.

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“…A low temperature sealing process allows the use of low emittance soft coatings reduces radiative heat transfer between glass panes and toughened glass allows to increase support pillar spacing reduces conductive heat transfer. The problem with low temperature edge sealing material is indium alloy is high-priced and for long term cost effective vacuum glazing, this method is not encouraged at commercial level [13,14].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity Measurement of Vacuum Tight Dual- Edge Seal for the Thermal Performance Analysis of Triple Vacuum Glazing

Memon¹

2018

Impact of Thermal Conductivity on Energy Technologies

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A vacuum tight glass edge seal's thermal conductivity is one of the principal factor in determining the heat distribution towards the centre of pane, ultimately influences the thermal transmittance (U-value) of a triple vacuum glazing. So far indium and solder glass have proven to be vacuum tight edge sealing materials but both have certain limitations. In this chapter, a new low-temperature vacuum tight glass edge seal composite's thermal conductivity, Cerasolzer CS186 alloy and J-B Weld epoxy-steel resin, were measured and validated with the mild-steel and indium using transient plane source method with a sensor element of double spiral and resistance thermometer in a hot disk thermal constants analyser TPS2500s are reported. The thermal conductivity data of Cerasolzer CS186 alloy and J-B Weld epoxy steel resin were measured to be 46.49 and 7.47 Wm À1 K À1 , with the deviations (using analytical method) of AE4 and AE7% respectively. These values were utilised to predict the thermal transmittance value of triple vacuum glazing using 3D finite element model. The simulated results show the centre-of-glass and total U-value of 300 Â 300 mm triple vacuum glazing to be 0.33 and 1.05 Wm À2 K À1 , respectively. The influence of such a wide edge seal on the temperature loss spreading from the edge to the central glazing area is analysed, in which the predictions show wider edge seal has affected the centre-of-glass U-value to 0.043 Wm À2 K À1 due to the temperature gradient loss spread to 54 and 84 mm on the cold and warm side respectively.

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Triple vacuum glazing: Heat transfer and basic mechanical design constraints

Cited by 99 publications

References 14 publications

Design, Development and Thermal Performance Analysis of Ultra-Low Heat Loss Triple Vacuum Glazing

Design, Development and Thermal Performance Analysis of Ultra-Low Heat Loss Triple Vacuum Glazing

A new low-temperature hermetic composite edge seal for the fabrication of triple vacuum glazing

Thermal Conductivity Measurement of Vacuum Tight Dual- Edge Seal for the Thermal Performance Analysis of Triple Vacuum Glazing

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