Thermal performance impacts of center-of-glass deflections in installed insulating glazing units

Hart, Robert E.; Goudey, Howdy; Arasteh, D.; Curcija, Dragan

doi:10.1016/j.enbuild.2012.06.026

Cited by 15 publications

(8 citation statements)

References 4 publications

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“…Due to need for separating different parts of the window for simulation of one square meter of triple-glazing glass and measuring the factors related to glass simulation, we have used WINDOWS 6 for its efficiency and capability for our purpose. Reliability of the measures and the results has been proved by various tests and measurements (Smith et al, 2012;Hart et al, 2012). Finally, after gaining the data, findings were changed into charts by Grapher 9 software so that their analysis would be easy.…”

Section: Methodsmentioning

confidence: 99%

The Influence of Tilt Angle on Heat Loss and Solar Gain in Triple Vacuum Glazing

2019

Int. J. Adv. Stu. Hum. Soc. Sci.

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Hundreds of thousands and perhaps millions of riyals are spent each year for heating and cooling homes and workplaces. Globally, buildings are responsible for approximately 40-45 percent of the total world annual energy consumption. Most of this energy is used for the provision of lighting, heating, cooling and air conditioning. The severity of the climatic conditions in the period considered and the rapid development and increased affluence of recent last decades are among the contributing factors. In particular, much research is focused on thermal energy storage due to heat transfer between the building envelope and the surrounding environment, in order to predict the rate of heat transfer and to develop minimisation strategies. However, the design and construction of modern residential buildings, which are heavily reliant on electrical systems for control of the internal built environment, are causing greater concern. Also, most of the environmental pollution caused by fossil energy are used feeling the need to make use of alternative energy and efforts to minimize the energy dissipation. As a result, local attention is focused on improving energy efficiency for residential buildings. Among the various components of the building envelope, windows require a careful design because much of the heat dissipation occurs there. Windows are responsible for a disproportionate amount of unwanted heat gain and heat loss between buildings and the environment. Solar heat gain plays a major role in determining the thermal performance of a building and increasing or decreasing solar gains can be of crucial importance in design problems. Energy efficient windows should minimize thermal losses as well as air leaks; this is achieved in practice by a combination of different technical solutions, such as multi-layer glazing, low thermal conductivity gas fills, painted glass surfaces, low-emission coatings, edge spacers, and frame materials. An optimal window design with a suitable glazing compound can considerably reduce the energy consumption of air conditioning systems in the residential buildings. In commercial, industrial and public buildings, an optimum window design has the potential to reduce the cost of illumination as well as that of heating, ventilation and air-conditioning (HVAC). Computer simulations are commonly used to provide an expanded scope of systematic study and enable consideration of wide ranges and combinations of parameters. In this study, by computer modeling of the thermal dissipation of impact of tilt angle on the triple vacuum glazing with a thickness of 42 mm, in which a layer of Argon gas used to compare the three main technical factors have been Serajian Tehrani et al. Int. J. Adv. Stu. Hum. Soc. Sci. 2019, 8(2):187-194 188 | Page examined. These three main factors are heat transfer coefficient, relative rate of heat absorption and solar heat gain coefficient. The model of triple vacuum glazing is based on a commercial product that is available on the consumer market in Tehran. The results show t...

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Section: Methodsmentioning

confidence: 99%

The Influence of Tilt Angle on Heat Loss and Solar Gain in Triple Vacuum Glazing

2019

Int. J. Adv. Stu. Hum. Soc. Sci.

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“…Hart et al [4] analyzed the U g -value calculated from real deflections of double and triple-glazed units, measured in summer and winter at several locations in the USA. It was found that a 20 • C temperature difference reduces thermal performance by 4.6% for double-glazed IGUs and by 3.6% for triple-glazed IGUs.…”

Section: (C) (B) (A)mentioning

confidence: 99%

Heat Transfer Through Insulating Glass Units Subjected to Climatic Loads

Respondek

2020

Materials

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One of the structural elements used in the construction of insulating glass units (IGUs) are tight gaps filled with gas, the purpose of which is to improve the thermal properties of glazing in buildings. Natural changes in weather parameters: atmospheric pressure, temperature, and wind influence the gas pressure changes in the gaps and, consequently, the resultant loads and deflections of the component glass panes of a unit. In low temperature conditions and when the atmospheric pressure increases, the component glass panes may have a concave form of deflection, so that the thickness of the gaps in such loaded glazing may be less than its nominal thickness. The paper analyses the effect of reducing this thickness in winter conditions on the design heat loss through insulating glass units. For this purpose, deflections of glass in sample units were determined and on this basis the thickness of the gaps under operating conditions was estimated. Next, the thermal transmittance and density of heat-flow rate determined for gaps of nominal thickness and of thickness reduced under load were compared. It was shown that taking into account the influence of climatic loads may, under certain conditions, result in an increase in the calculated heat loss through IGUs. This happens when the gaps do not transfer heat by convection, i.e., in a linear range of changes in thermal transmittance. For example, for currently manufactured triple-glazed IGUs in conditions of “mild winter”, the calculated heat losses can increase to 5%, and for double-glazed IGUs with 10–14 mm gaps this ratio is about 4.6%. In other cases—e.g., large thickness of the gaps in a unit, large reduction in outside temperature—convention appears in the gaps. Then reducing the thickness of the gaps does not worsen the thermal insulation of the glazing. This effect should be taken into account when designing IGUs. It was also found that the wind load does not significantly affect the thickness of the gaps.

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“…Due to the fact that heat losses through the TSEWE are directly proportional to its area, equation (8) can be used to calculate the TSEWE of different size. Since the dependence of heat loss through the TSEWE on orientation is characterized only by the coefficient of additional heat energy losses, the total losses will differ from them by the same value [33].…”

Section:  mentioning

confidence: 99%

“…[6], Arasteh D.K. [7][8][9], Hart R. [8], Goudey H. [8,9], Muhaisen A.S. [10], Klevets K. [11], Kolesnyk Y.A. [12], Zekraoui D. [13], Bülow-Hübe H. [14], Melendo J.M.A.…”

Section: Introductionmentioning

confidence: 99%

Conditions for ensuring energy-saving use of translucent structures of exterior wall envelope

Burmaka¹,

Tarasenko²,

Kozak³

et al. 2020

Energy eng. control syst.

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The article focuses on determining the translucent structures of exterior wall envelope (TSEWE) properties influence on the total energy balance of the room. The dependence of the energy consumption for artificial lighting on the daylight factor, coefficient of relative penetration of solar radiation (CRPSR) and TSEWE area is determined for Ternopil city. The relationship between the electricity expenses for heating and cooling the room by channel air conditioners on the size and properties of TSEWE is established. Inequalities were obtained that allow us to establish the conditions under which the TSEWE use will have a positive effect on the total energy balance of the office room for the Ternopil city. According to the obtained results, it is possible to determine the thermal resistance, CRPSR and the TSEWE area at which energy savings will occur while observing the climate conditions in the room prescribed by regulations documents.

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Thermal performance impacts of center-of-glass deflections in installed insulating glazing units

Cited by 15 publications

References 4 publications

The Influence of Tilt Angle on Heat Loss and Solar Gain in Triple Vacuum Glazing

The Influence of Tilt Angle on Heat Loss and Solar Gain in Triple Vacuum Glazing

Heat Transfer Through Insulating Glass Units Subjected to Climatic Loads

Conditions for ensuring energy-saving use of translucent structures of exterior wall envelope

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