What are the most energy efficient windows


For a long time now, windows are no longer just transparent area filling elements. With rising energy costs, they have developed into sophisticated building components with a wide range of properties and functions. Today, high-quality windows are available in terms of thermal engineering, the insulation values ​​of which are in no way inferior to those of the outer walls of old buildings. In the book, Andreas Wagner, Sebastian Henkel and Walter Kohne explain what options they offer, what variants there are and how they work Energy-efficient windows and glazing.

The fourth edition of the specialist book focuses on glazing and frames. After a short introduction, the authors first describe the building physics basics and key parameters of windows. These include, for example, the light and radiation permeability, the heat transport caused by the temperature difference between the interior of the building and the environment, as well as the use of daylight. The chapter Glazing and frames for improved thermal protection Contains detailed information on selective coatings for thermal and sun protection glazing, gas fillings in the space between the panes, thermally optimized frame structures and new materials for the edge seal to reduce the thermal conductivity in the edge area (warm edge). The innovative vacuum insulating glass and the explanations of the technical possibilities of modern glazing in thermal and optical terms are particularly interesting.

Current glare and sun protection systems, glazing and switchable glasses for controlling solar radiation and light are discussed in the section Innovative sun protection and light control treated. In further chapters, the authors explain, among other things, the structural aspects that have to be taken into account when integrating windows in new and existing buildings. One chapter is the important topic Energy and ecology dedicated. It clearly explains the physical relationships between the overall energy balance of a building and the ecological value of the materials used. This is followed by a clear compilation of commercially available calculation programs for the energetic evaluation of windows (U-values, g-values), which also includes FE programs for calculating two-dimensional heat flows in component cross-sections.

From the content:

  • Window technology in transition
  • Design and function of windows
  • Building physics basics and parameters
  • Glazing and frames for improved thermal protection
  • Innovative sun protection and light control
  • Structural aspects - the window in the building envelope
  • Energy and ecology
  • Calculation programs and other tools for the energetic evaluation of windows
  • Federal government energy research
The technical book not only reflects the current state of the art, but also clearly conveys the relationships between glass and frame with its clearly written texts, numerous photos, drawings and graphics. It is aimed primarily at architects and planners, but also at skilled builders and students. A must for everyone who deals with glazing in everyday life!

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