Hur Boverkets regelverk påverkar energianvändningen i kontorsbyggnader med glasfasad
Examensarbete för masterexamen
Office buildings with glass façades have been and still are modern elements in architecture. The large amount of glass surface deteriorate the climate barrier of the building from the heat insulation’s point of view. Furthermore, the heat load from the incoming sunlight increases compared to a traditional façade. In this thesis the influence of these characteristics affect the specific energy use of the building. Building regulations 06, BBR 06, were introduced in July 2006. The most important difference between this edition and its forerunner BBR 94 is that there now are demands on the specific energy use in buildings instead of the climate barrier’s thermal transmittance. Moreover, in the building sector is the energy declaration that will take affect in the turn of the year 2008/2009. The main office of Posten in Solna, Stockholm has been the application object in this thesis. The purpose in this stydy is to investigate how the energy use in an office building is affected of the fact that the façade is made of glass. A description of how the regulations from national board of housing, building and planning and the energy declaration concern an office building with glass façade. Calculations with different share of glass in the façade have been made to see how the amount of glass affects the energy use of the building. Calculations of how daylight inlet varies with different share of glass in the façade have also been made. The possibility to decrease the amount of artificial lighting when there is a large share of glass in the façade is discussed. There are many aspects to take under consideration when designing a glass façade, the daylight inlet should be made used of without enlarging the risk of being dazzled and the heat load from the sun inlet should be minimized. Besides these aspects the façade glass and the construction should be adjusted to the building, this can for example be that the glass that both has low U-value and a high sun protection or that the construction is a double glassed façade. This work is based on facts from books, articles and calculations, but also information from contact with people with different competence. The calculations show that the activity in the building represent the largest part of the buildings total energy use. In the building’s specific energy use, where the energy use for the activity in the building is excluded, the largest item is the energy use for cooling. By decreasing the energy use in the buildings activity, the heat load also decreases which in turn leads to a decreased cooling need. Keywords: Energy use, office buildings, glass façades, BBR, energy declaration, specific energy use, incoming daylight.
Byggnadsteknik , Building engineering