Rätt fönster i olika väderstreck
En undersökning av energieffektiva fönsters påverkan på byggnaders energiprestanda
The Swedish building stock accounts for nearly 40 percent of the total energyconsumption in the country. Properties built today are likely to last for 100 years orlonger. This places high demands on long-term and smart energy solutions that willkeep the future Swedish building stock energy consumption at low levels. This thesishas focused on examining how the energy performance of buildings is affected bydifferent choices of window types in different cardinal directions. The objective wasto obtain a basis for recommendations on how window properties can be optimizedfor different types of buildings and orientations. The results are based on energysimulations of two different types of buildings, an office building and an apartmentbuilding.The conclusion is that the heat gain coefficient shown to have a major impact on theenergy performance of buildings. This questions the Swedish energy labeling systemthat only takes into account the window's U-value.During the process of finding suitable energy efficient windows, a calculation algorithmhas been developed. This algorithm can be used by energy simulation experts toestimate an unknown ST-value of window glass combination when the g-value isknown. The algorithm applies to coated solar control glass combinations.