K-value updated by U-value

Date: 11 October 2001
Source: Veka
In autumn of this year the term "k-value" for the heat transition coefficient for windows and doors will be completely replaced by the term "u-value".

This change is simultaneously taking place with the introduction of the Building rules list 2001/ 2 from the German Institute for Building Technology (DiBt). The technical rules are especially important for people in the glazing and window branch, because they refer to the still valid heat insulation recommendation with the necessary calculation values of the heat transition coefficient for glazing UV and for windows and window-doors, including the Frame UF. In the quoted DIN V 4108-4 only the letter "U" replaces the letter "K", without the other international customary calculation methods. In addition there is confusion in regard to the indexes, the Europeans have a different written version and also a different meaning. Therefore here is a list of the co-relations:

kF = UF
kV = UV = Ug
kR = UR = Uf
UF + 0,1 bis 0,3=UW *

* Uw includes the influence of "cold bridges insulation glass edge/ connection systems". It is abbreviated with the letters (psi), as the "length related heat transition coefficient" (in W/mk) and is multiplied by the length of the glazing edge. The UV-value is an officially recognized calculation value, the so-called BAZ (federal indicator) value.

600450 K-value updated by U-value glassonweb.com
Date: 11 October 2001
Source: Veka

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