Heat Conduction Through the Support Pillars in Vacuum Glazing

Wilson, Christabel F.; Simko, T.M.; Collins, Richard

doi:10.1016/s0038-092x(98)00079-6

Cited by 57 publications

(30 citation statements)

References 9 publications

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“…The 25 nodes were distributed in a graded mesh through the glazing thickness of 8.12mm. The thermal conductance of this simulated unit with a pillar in the centre was in good agreement with the analytic prediction with 1.5% variation, which is comparable to the result of Wilson et al [14]. This level of agreement indicates that the density of nodes is sufficient to simulate the realistic level of heat flow with high accuracy.…”

Section: -D Finite Volume Modelsupporting

confidence: 87%

Comparison of Vacuum Glazing Thermal Performance Predicted Using Two and Three Dimensional Models and Their Experimental Validation

Fang

Hyde

Hewitt

et al. 2008

Heat Transfer: Volume 1

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The thermal performance of vacuum glazing was predicted using two dimensional (2-D) finite element and three dimensional (3-D) finite volume models. In the 2-D model, the vacuum space, including the pillar arrays, was represented by a material whose effective thermal conductivity was determined from the specified vacuum space width, the heat conduction through the pillar array and the calculated radiation heat transfer between the two interior glass surfaces within the vacuum gap. In the 3-D model, the support pillar array was incorporated and modeled within the glazing unit directly. The difference in predicted overall heat transfer coefficients between the two models for the vacuum window simulated was less than 3%. A guarded hot box calorimeter was used to determine the experimental thermal performance of vacuum glazing. The experimentally determined overall heat transfer coefficient and temperature profiles along the central line of the vacuum glazing are in very good agreement with the predictions made using the 2-D and 3-D models.

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Section: -D Finite Volume Modelsupporting

confidence: 87%

Comparison of Vacuum Glazing Thermal Performance Predicted Using Two and Three Dimensional Models and Their Experimental Validation

Fang

Hyde

Hewitt

et al. 2008

Heat Transfer: Volume 1

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“…Wilson et al [15] demonstrated that the thermal resistances associated with the heat flow through individual pillars, and through the pillar array, are calculated using a simple analytic method and by more complex finite element models. However, they did not confirm the thermal performance of whole glazing.…”

Section: Experimental Test Of Vacuum Glazingmentioning

confidence: 99%

Analysis of the Performance of Vacuum Glazing in Office Buildings in Korea: Simulation and Experimental Studies

Cho

Kim

2017

Sustainability

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Abstract:Window performance in buildings is very important for energy saving. Many efforts have been made towards saving energy in buildings, and research has focused attention on enhancing the thermal performance of windows. Vacuum glazing has attracted much interest as a means of enhancing the thermal performance of windows by strengthening insulation performance. However, the performance of vacuum glazing differs based on various component combinations, therefore, further study on vacuum glazing is needed. In this paper, through simulations, the authors confirmed the heat transfer value (U-value) of the vacuum glazing composed of various combinations (glass type, number of layers, interval of pillar, etc.). A physical test of vacuum glazing was also performed using standard test methods of windows and the U-value of the vacuum glazing by various intervals of the pillar position was confirmed. The simulation revealed a U-value for vacuum glazing of 0.682-1.466 W/m 2 ·K as per the interval of the pillar position, the performance of solar heat gain, and visible light transmission. The U-value of the double vacuum glazing was calculated as 0.607-1.154 W/m 2 ·K and was similar regardless of the interval of pillar position, the performance of solar heat gain, and visible light transmission. Based on the results of the energy simulation, in the case of a used low U-value of vacuum glazing, the heating and cooling energy consumption in buildings decreased by 2.46%, than when low-e glass and argon gas filled layers were used in windows. Furthermore, in double vacuum glazing, the heating and cooling energy consumption in buildings decreased by 3.91%.

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“…국내에서는 이보화 등 (7) 이 모서 리를 통한 열전달 손실을 최소화할 수 있도록 고무 가스킷을 유리사이에 끼우고 진공 그리스를 이용하여 접합하는 방법을 제시하였다. 진공유리 설계에 있어서 이론적인 해석 역시 수행되어 왔는데 모서리를 통한 열전도 (7) , 지지기둥을 통한 열전도 (8) , 복사열전달 (9) , 잔류가스 전도 (10) 을 사용하였다. CFD에 사용된 격자 수는 약 32만개이고 3차원 형상 설계에는 Catia (12) , 격자 생성에는 Gambit (13) , 3차원 CFD 해석에는 상용 프로그램인 Fluent (11) 를 사용하였다.…”

Section: 서 론unclassified

A Study of Adiabatic Performance for Vacuum Glazing with Design Conditions

Hwang¹,

Lee

2012

Journal of manufacturing engineering & technology

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Recently, the low-emissivity glass has been used to reduce the energy loss through building windows. However, it simply reduces the inflow of solar rays and has a relatively high heat transmission coefficient. To solve the problems, a high-efficiency vacuum glazing has been under development but it has not been actively used due to its high price and insufficient performance. In this paper, the effects of internal pressure, pillar (spacer) height, pillar diameter, pillar interval, emissivity etc. on the performance of vacuum glazing have been analyzed with three-dimensional computational fluid dynamics and structural analysis. As a result, the performance of vacuum glazing was predicted more accurately and major factors that determine the performance of vacuum glazing were optimized.

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Heat Conduction Through the Support Pillars in Vacuum Glazing

Cited by 57 publications

References 9 publications

Comparison of Vacuum Glazing Thermal Performance Predicted Using Two and Three Dimensional Models and Their Experimental Validation

Comparison of Vacuum Glazing Thermal Performance Predicted Using Two and Three Dimensional Models and Their Experimental Validation

Analysis of the Performance of Vacuum Glazing in Office Buildings in Korea: Simulation and Experimental Studies

A Study of Adiabatic Performance for Vacuum Glazing with Design Conditions

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