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Windows, doors and stairs
Published in Derek Worthing, Nigel Dann, Roger Heath, of Houses, 2021
Derek Worthing, Nigel Dann, Roger Heath
Introducing more panes of glass, as with triple or quadruple glazing, produces a larger insulating buffer between outside and inside and divides the space up to reduce convective heat losses. As can be seen in Table 18.1 this can have an impact on the U-value. Currently triple glazing is relatively expensive compared to double glazing. There are other disadvantages too. A triple glazed IGU is significantly heavier and wider than a double glazed unit. This requires a different sectional dimension for both the window frame and any opening casement. They will take up more space within the depth of the wall opening. There have also been fractures in the internal/middle glass sheet as these are encapsulated within the IGU and can be thermally isolated. This has led to thermal stress, as this pane will attain significantly greater temperature than that found in double glazed IGUs. This can be avoided by using a toughened glass for the internal/middle pane in triple glazing. But this adds to the cost of the already expensive triple glazed IGU. A number of manufacturers are now routinely marketing triple glazed windows in the UK.
Energy Modeling
Published in Kjell Anderson, Design Energy Simulation for Architects, 2014
While there are exceptions, more insulation is often one of the most cost-effective, low-technology design moves that can reduce energy consumption. Increasing insulation levels tends to lead to smaller mechanical plant and ductwork sizes, lower heating and cooling loads, and generally increased comfort. In buildings with a high glazing percentage achieving a high insulation value requires triple or quadruple glazing, which are often prohibitively expensive.
Thermal insulated PVC windows for residential buildings: feasibility of insulation performance improvement by various elemental technologies
Published in Journal of Asian Architecture and Building Engineering, 2021
Kazunori Takada, Hirofumi Hayama, Taro Mori, Koki Kikuta
Polyvinyl chloride (PVC) windows are widely used, especially in cold regions where high thermal insulation performance is needed. PVC thermal insulation windows made in Japan have a thermal transmittance of around 0.8 W/(m2·K). Windows with an even better insulation performance are available in other countries. For example, in Europe, there are products with a thermal transmittance of 0.7 W/(m2·K). In both cases, this level of insulation is achieved by using triple glazing. Quadruple glazing offers even better insulation, but it results in very heavy windows. Hence, quadruple glazing is not only unsuitable for ordinary housing but can also lead to higher manufacturing costs due to the design alterations that are needed to ensure that window frames are rigid enough to cope with the added weight.