WA-08engl/3
Thermally improved spacers; Part 1: Determination of representative Ψ-values for profile sections of windows
Seiten
2015
ift Rosenheim (Verlag)
978-3-86791-374-4 (ISBN)
ift Rosenheim (Verlag)
978-3-86791-374-4 (ISBN)
Determination of representative Psi-values for profile sections of windows
As set out by the window product standard EN 14351-1 clause 4.12, one of the methods to determine the thermal transmittance UW of windows is by calculation as per EN ISO 10077-1. The quantities required for this calculation are the thermal transmittances of the frame and the glazing, Uf and Ug, respectively as well as the linear thermal transmittance Psi. The Psi-value describes the heat loss caused by fitting the glass in the frame. The amount of this Psi-value depends largely on the type of spacer inserted in the insulating glass unit. In this context we distinguish between ‘conventional‘ and thermally improved spacers. The definition of a thermally improved spacer is included in EN ISO 10077-1 and has again been summarised in the scope of this guideline.
For calculation of the UW-value of windows, EN ISO 10077-1 states global Psi-values for both ‘conventional‘ and thermally improved spacers which can be used without further verification. But it is also possible to calculate the Psi-value for thermally improved spacers as per EN ISO 10077-2. In this conjunction it should be taken into account that the Psi-value depends on the profile section, the configuration of the glass unit as well as the respective built condition and mounting situation.
As set out by EN 14351-1, evidence of performance of windows is based on representative test specimens. For example, it is sufficient to calculate the thermal transmittance UW of a representative size of 1.23 m x 1.48 m. Likewise, also other characteristics, such as air permeability can be determined using representative test specimens.
As set out by the window product standard EN 14351-1 clause 4.12, one of the methods to determine the thermal transmittance UW of windows is by calculation as per EN ISO 10077-1. The quantities required for this calculation are the thermal transmittances of the frame and the glazing, Uf and Ug, respectively as well as the linear thermal transmittance Psi. The Psi-value describes the heat loss caused by fitting the glass in the frame. The amount of this Psi-value depends largely on the type of spacer inserted in the insulating glass unit. In this context we distinguish between ‘conventional‘ and thermally improved spacers. The definition of a thermally improved spacer is included in EN ISO 10077-1 and has again been summarised in the scope of this guideline.
For calculation of the UW-value of windows, EN ISO 10077-1 states global Psi-values for both ‘conventional‘ and thermally improved spacers which can be used without further verification. But it is also possible to calculate the Psi-value for thermally improved spacers as per EN ISO 10077-2. In this conjunction it should be taken into account that the Psi-value depends on the profile section, the configuration of the glass unit as well as the respective built condition and mounting situation.
As set out by EN 14351-1, evidence of performance of windows is based on representative test specimens. For example, it is sufficient to calculate the thermal transmittance UW of a representative size of 1.23 m x 1.48 m. Likewise, also other characteristics, such as air permeability can be determined using representative test specimens.
| Sprache | englisch |
|---|---|
| Maße | 210 x 297 mm |
| Einbandart | gebunden |
| Themenwelt | Technik ► Bauwesen |
| Weitere Fachgebiete ► Handwerk | |
| Schlagworte | EN 14351-1 • EN ISO 10077-1 • ift-Guideline WA-08engl • Thermally improved spacers • WINDOWS |
| ISBN-10 | 3-86791-374-9 / 3867913749 |
| ISBN-13 | 978-3-86791-374-4 / 9783867913744 |
| Zustand | Neuware |
| Haben Sie eine Frage zum Produkt? |
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