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Fenestration design for low and nearly zero energy buildings in a cold climate.

Number: pap. 407

Author(s) : THALFELDT M., KURNITSKI J., VOLL H.

Summary

In order to achieve nearly zero energy building (nZEB) requirements by 2021 in a cold climate energy effective façades are one important factor in the design of such buildings. In this study we derived optimal design principles for a cold climate regarding window sizes, solar protection, thermal insulation and daylight leading to optimized total energy performance of office buildings. Special attentions was paid to highly insulated glazing elements with U-values of 0.6 W/(m2 K) and below and high visible transmittance of about 0.6-0.7. Energy and daylight simulations were conducted for model office space representing typical open plan offices. Window to wall ratio, solar heat gain coefficient, visible transmittance and solar shading was varied in order to optimize energy performance. The analysis show that the heating need is dominating in the energy balance. This together with economic considerations was the major reason to limit the window to wall ratio. The optimal ratio was about 23% with highly insulated and transparent windows, whereas external shading improved energy efficiency on west and east facades and on south and north facades, the effect was opposite. Lower g and visible transmittance values required increased window to wall ratios to maintain minimal daylight and resulted in less optimal energy performance.

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Pages: 9 p.

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Details

  • Original title: Fenestration design for low and nearly zero energy buildings in a cold climate.
  • Record ID : 30009006
  • Languages: English
  • Subject: Environment
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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