How far does the solar heat go

Passive solar heat thanks to large windows

Passive solar heat can be used thanks to large windows. That explains the Federal Association of German Prefabricated Buildings (BDF). Many people in Germany are currently feeling this phenomenon positively. Because early in the year the daytime temperatures and the number of hours of sunshine reach double-digit values, while the nights remain frosty. According to BDF, almost all new buildings are now equipped with large windows in order to benefit from the solar heat gain. Alternatively, there is also the option of a solar house with a solar thermal system in the new building.
"Large-scale, sometimes floor-to-ceiling glazing is standard in house construction today, because modern, multi-glazed windows let in a lot of light and solar heat, but no longer release it to the outside as quickly as it used to", says BDF managing director Achim Hannott.

In connection with the already above-average energy-efficient wall structure of a prefabricated wooden house and with smart building technology including photovoltaic systems, new buildings that generate more energy over the course of the year than their residents consume are no longer isolated cases. "Together, the building materials wood and glass can ideally display their strengths in the areas of living comfort and energy efficiency in a prefabricated house."
This goes so far that individual house manufacturers erect their constructions in modern half-timbered architecture and fill the majority of the compartments with glass surfaces. One speaks here of the wooden frame construction, with which builders like to design an open living space in connection with a large garden. On a suitable plot of land, for example at an exposed altitude with a clear view, this promises an exclusive ambience and a high level of living comfort. At the same time, this ensures great potential for hours of sunshine with solar heat and energy gains.

Orientation towards the sky is recommended

“From an energetic point of view, it makes sense that large windows and glazing are aligned with the sky when planning the house. Solar inputs are best with a south-facing orientation, but east or west-facing orientations also have clear advantages, ”says Frank Lange, Managing Director of the Windows + Facade Association. Because here the warming rays of the sun could enter the apartment for most of the day.

For thermal protection in summer, however, suitable sun protection should always be used. “Around a third of the prefabricated houses are planned as smart homes right from the start. Here it makes sense to intelligently integrate the sun protection in front of the window in order to bring in solar heat gains when they are really useful and desired. "

5.3.2021 | Source: BDF | © Solarserver / Solarthemen Media GmbH


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