Heat Transfer Through Insulating Glass Units Subjected to Climatic Loads

Respondek, Zbigniew

doi:10.3390/ma13020286

Cited by 18 publications

(13 citation statements)

References 10 publications

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“…The base model for determining static quantities in a rectangular IGU is described in [ 7 , 20 ]. The unit consists of n slots and ( n + 1) glass plates; the subscript symbols for the gaps and plates are described in Figure 1 .…”

Section: Methodology Of Researchmentioning

confidence: 99%

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Deflections and Stresses in Rectangular, Circular and Elliptical Insulating Glass Units

2022

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Insulating glass units (IGUs) are construction elements that react to climatic loads in a specific way. Under the influence of changes in atmospheric pressure and temperature, as well as the effect of wind, the gas closed in the tight gap between the glass panes changes its pressure, which affects the resulting static quantities of the loaded IGUs. The calculation models described in the literature mostly concern rectangular units, however, other shapes are being implemented more and more often in modern architecture. The aim of the article was to propose analytical and numerical models of circular and elliptical IGUs and to compare their results in terms of deflections and stresses with static values for square and rectangular units. Calculation examples were presented for various dimensions of IGUs loaded with changes in atmospheric pressure and an external wind effect. For elliptical IGUs, only the numerical calculations were presented, as it is not possible to formulate an applicable deflection function practically. The results were summarized in the form of tables and graphs, which illustrate the percentage differences between the deflection and stress values for the rectilinear and curvilinear shapes of IGUs for various dimensions and types of loads. It was found that in a single circular glass pane the maximum deflection is 4.2% greater, and the maximum stress is 13% greater than in a square unit of the same dimension. Meanwhile, in a circular, symmetrically loaded double-glazed IGU, the deflection in the circular IGU is smaller by 8–9% than in the square unit and the stress is practically identical.

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Section: Methodology Of Researchmentioning

confidence: 99%

“…The methodology of calculating Δ v is described in more detail in [ 20 ]. After applying the function of deflection from Timoshenko and Woinowsky-Krieger [ 5 ] and the appropriate transformations, the following was obtained:

where:…”

Section: Methodology Of Researchmentioning

confidence: 99%

Deflections and Stresses in Rectangular, Circular and Elliptical Insulating Glass Units

2022

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“…The conducted analysis refers to an own model of the behavior of climatically loaded IGUs with any number of gaps (Respondek, 2017;2020;Respondek et al, 2022), hereinafter referred to as the base model. In that model, a linear dependence of the deflection [m] in the center of the IGU component pane on the resultant load [kN/m 2 ] acting on this pane was assumed.…”

Section: Methodology Of Researchmentioning

confidence: 99%

Gas interaction in insulating glass units in the case of elastic support of component glass panes

Respondek¹

2022

BoZPE

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Insulating glass units (IGUs), commonly used for filling windows and glass facades, have in their construction a tight gas-filled gap. This determines the good thermal insulation of the IGU, but at the same time makes it sensitive to climatic loads (changes in atmospheric pressure, temperature, wind load etc.). In the IGU gas interaction calculation models, these loads are usually simply supported at the connection of the component panes with the edge spacer. Under real conditions, another type of connection is possible, which was the subject of interest by several researchers. In this article, on the basis of the general theory of plates, an analytical model of the resultant load and deflection of IGUs under climatic loads is proposed, taking into account elastic support of the component panes. The computational examples illustrates the influence of connection stiffness on the resultant climatic load and deflection in IGUs.

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“…With the change in the number of glass panes in the IGU, the distance between them may also change [10]. M. Arici says the effect of the gap width on the energy saving is more noticeable for low temperature differences.…”

Section: Dependence Of Total Window Thermal Transmittance On Igusmentioning

confidence: 99%

The Changes in Thermal Transmittance of Window Insulating Glass Units Depending on Outdoor Temperatures in Cold Climate Countries

et al. 2021

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Windows, which have a U-value that is governed by an insulating glass unit (IGU) U-value, must be a building’s only enclosure element, which has no design value concept. The declared U-value, which is calculated or measured with 0 °C of external ambient temperature, is used instead of the design value. For most of a building’s elements, its thermal transmittance with a decrease in the external temperature diminishes a little, i.e., improves. However, for modern window IGUs with Low-E coatings, it is the opposite: the thermal transmittance with a lowering external temperature increases. Therefore, for calculating the peak power for the heating of buildings it is necessary to pay attention to this phenomenon and, therefore, it would be wise to introduce the concept of design U-value for windows, recalculation rules, or affix their declared U-values. This is especially the case in modern times with the prevailing architectural tendencies for enlargement of transparent building elements. For IGUs with Low-E coatings and inert gas fillers, the thermal transmittance depends on the temperature difference between warm and cold environments. When the external temperature is −30 °C instead of 0 °C, the thermal transmittance of the IGU can increase by up to 35%. This study presents the thermal properties of windows’ IGUs depending on the changes in outdoor temperatures by using guarded a hot box climate chamber and presents the proposed simplified methodology for determining the thermal properties of windows’ glass units. The accuracy of the composed simplified methods, comparing the calculated thermal transmittances of IGUs with those measured in the “hot box”, were up to 1.25%.

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Heat Transfer Through Insulating Glass Units Subjected to Climatic Loads

Cited by 18 publications

References 10 publications

Deflections and Stresses in Rectangular, Circular and Elliptical Insulating Glass Units

Deflections and Stresses in Rectangular, Circular and Elliptical Insulating Glass Units

Gas interaction in insulating glass units in the case of elastic support of component glass panes

The Changes in Thermal Transmittance of Window Insulating Glass Units Depending on Outdoor Temperatures in Cold Climate Countries

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