warm edge

Research project “Equivalent thermal conductivity warm edge”

May 25th, 2013. As reported before, another research project was carried out at ift Rosenheim, sponsored by the German Center of Competence in Civil Engineering (Deutsches Institut für Bautechnik DIBt) and co-financed by the working group Warm Edge. Results were the update of the BF data sheets ‘Psi-values for windows’ (see this article here) und a new ift-guideline (info here).

In the meantime, the research report of December 2012 is published as well. Interested parties may download the report in German or English language from the homepage of ift Rosenheim here.

New ift-guideline Thermally improved spacers

March 18th, 2013. Further to my previous announcement, ift Rosenheim, Germany, has published another ift-guideline about warm edge: WA 17/1 “Thermally improved spacers – Part 2: Determination of the equivalent thermal conductivity by means of measurement”. This guideline is a result from the latest research project of the working group “Warm Edge” of the German association Bundesverband Flachglas (BF). The guideline explains how to determine the so-called equivalent thermal conductivity value λeq,2B of a spacer and how to use it for the simulation of Ψ-values of windows according to EN ISO 10077-2, instead of a detailed geometrical spacer model with a multitude of individual conductivity values of the spacer constituents.

In comparison, this is a simple and pragmatic solution for obtaining of spacer input data for individual simulations. It helps to avoid mistakes with the modelling of rather complex spacer geometries. Furthermore, from now on, the “representative Ψ-values”, published on the BF data sheets “Psi-values for windows” will be determined according to this guideline.

The ift-guideline can be ordered in German language here. An English version will follow soon.

News from the Working Group “Warm Edge”

February 20th, 2013. During yesterday’s meeting in Rosenheim, the Working Group “Warm Edge” of the BF Bundesverband Flachglas agreed to update the data sheets “Psi-values for windows”. As a result of the latest research project of the Working Group, the representative Psi-values stated on the data sheets shall be simulated on the basis of measured equivalent thermal conductivity values of the warm-edge systems, and not as before with individual values of the sometimes complex product components.

The measurement method is described in a new guideline of ift Rosenheim, which will be published soon. Within the next weeks, the new data sheets will be available for free download on the BF websites. Warm-Edge manufacturers may utilize the old data sheets for their products until December 31st, 2013, after that deadline they will expire. You can find a first info (in German) about the research project here. More will follow in the relevant technical press – I will let you know here in my blog and in my literature list.

The Working Group “Warm Edge” consists of well-known manufacturers of warm-edge-systems, representatives from glass industry and members from higher education and research.

Do you have wishes or suggestions for the Working Group? If so, let me know!

BF-Webinars 1st half of 2013

February 5th, 2013. With the following webinar topics, I am included in the seminar program spring/summer 2013 of the BF Bundesverband Flachglas:

March 21st, 2013
Spacers / Warm edge – Basics
April 4th, 2013
Spacers / Warm edge – Thermo-technical properties
April 11th, 2013
Glass failure – Basics
May 23rd, 2013
Glass failure – Specifics

These online tutorials are all held in German language. They take approximately one hour each and shall give a first overview about the topics. More in detail and in english language are my on-site-workshops.

Information about the BF-Webinar-program is available here (in German):

On 05. February 2013|By |Dates|0 Comments

Impressions from BAU 2013 Munich

January 18th, 2013. How nice to almost exclusively see triple glazings with warm edge spacers in the exhibits of the wooden and pvc window producers of Hall B4, C4 and B5. It has got around that warm edge is advantageous because it improves the Uw-values. The further distribution of warm edge is unstoppable, same as for triple glazing.

Metallic systems though seem not yet to have taken the message entirely. Hall A1 still contained quite a few exhibits with double glazings, often with aluminium spacers. What a pity, considering the high thermotechnical sensitivity of metallic window and facade systems to the improvement of the transition area between glass and frame. The use of warm edge makes technical sense and is a economic measure. As for the next BAU 2015, I am confident that regarding spacer and glass, also the exhibits in hall A1 will be up-to-date.

Webinar offer

January 6th 2013. In 2013, I am included again with the subjects “warm edge” and “glass damages” in the range of webinars proposed by the German glass association BF Bundesverband Flachglas. Although those webinars are in German language, I will publish the dates of the first half of 2013 here, as soon as they are fixed. More information is available directly at the BF, Troisdorf, Germany.

On 06. January 2013|By |Dates|0 Comments


January 6th, 2013. Welcome to my website! Please consider this place as a forum for exchange within the world of warm edge and glass. I am looking forward to receiving your comments or helpful suggestions.