Energy efficiency of windows: the Uf value

After covering thermal transmittance U and resistance R of opaque assemblies, and insulated glass, we now cover one of the most critical areas of the thermal envelope: window frames. Good windows are the cornerstone of a performing building for both comfort and energy efficiency, specially if it is a passive house.

Thermal transmittance of glass: the Ug value

Insulated glass units, IGU for short, have been around for a long time. These elements are of primary importance for the energy balance of highly performing buildings and passive houses: that is why we dedicate this article to the thermal transmittance of insulated glass.

FensterBau 2016 in Nuremberg

Last week we went to Nuremberg, Germany, for the 2016 edition of FensterBau, one of the most important expos worldwide for window production. Target of the fair is the entire sector of windows and openings. The event is organized alongside the Holz-Handwerk expo, addressing wood carpentry in the broadest sense.

Thermal paints: just a joke?

With a short investigation, we add our contribution to what has been recently published by some Italian consumers and professionals associations. Although the example described in this article is purely Italian (and deeply so), we believe that the same situation with thermal paints is happening in other countries too. Here we try and evaluate how solid this products are, and whether or not they can be helpful, with an example of a thermal bridge.

Thermal transmittance U vs th. resistance R

To achieve thermal comfort and energy efficiency in buildings, a primary role is played by the thermal envelope: this is required to thermally decouple the indoor environment from the ever-changing external conditions, both in summer and in winter. The structures of the thermal envelope need to be able to control the amount of heat migrating through them: the thermal resistance and the thermal transmittance are two ways to describe this phenomenon.

Insulation materials: discovering the lambda value

The lambda value of a material indicates its ability to transfer heat: this property is therefore very important in the design of highly performing buildings and passive houses. The information commonly available is unfortunately quite confusing: with this article, we'll try and shed some light on the topic.

Mold and condensation: if the solution is worse than the problem

We cover here two real examples of mold and condensation problems, with thermal insulation installed on the inside of existing masonry walls. In both cases, the solutions were chosen on an empirical basis, and turned out to be worse than the problems they were trying to mitigate.

Passive House Window Talks 2016

A couple of weeks ago, we took part to the 2016 edition of the Passive House Window Talks. This year, the location was Riga, Latvia. The focus of the event is the importance of windows for comfort and energy efficiency of highly performing buidlings such as passive houses.

What’s an insulation material?

With more and more people talking about building energy efficiency and passive houses, it has become more and more common to hear about insulation. In this article, we explain what an insulation material is, to try and shed some light…

Andrew Michler’s Passive House

During Enrico’s recent visit to Colorado, we finally had the chance to visit Andrew Michler’s passive house. At about 2.000 m (6.400 ft), in the mountains near Fort Collins, Colorado, this building is capable of remaining comfortable even in case of a power outage, with an interior temperature of about 18°C (64°F) with no heating.

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