Biennial international conference on Building Enclosure Science and Technology edition:2nd location:Portland date:12-14 April 2010
Energy use in buildings accounts for a significant part of the energy use and greenhouse gas emissions. New building regulations and new measures have been introduced to improve the energy efficiency of buildings. The passive house concept has been suggested as the next step, whereas zero emission buildings may follow in the near future. In these buildings the envelope constructions will have significant amounts of traditional thermal insulation, e.g. wall thicknesses up to about 400 mm are expected in passive houses. Such large thicknesses are not desirable due to several reasons, e.g. floor area considerations, efficient material use and need for new construction techniques.
Vacuum insulation panels (VIPs) are regarded as one of the most promising existing highly thermal insulation solutions on the market today. Thermal performances 5 to 10 times better than traditional insulation materials (e.g. mineral wool) are achieved, resulting in substantial slimmer constructions. However, the robustness of building envelope systems applying VIPs are questioned. In addition, thermal bridging due to the panel envelope and load bearing elements may have a large effect on the overall thermal performance. Degradation of thermal performance of VIPs are also a crucial issue due to moisture and air diffusion through the panel envelope.
In this work the thermal performance and robustness of vacuum insulation panels in wood frame wall constructions are studied by hot box measurements and numerical simulations. Different VIP configurations, edge joints and wood frame wall compositions are investigated.