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System Performance | System Description | Case Study |
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System Performance
Using a sandwich system of an outer glass pane, an inner cavity with a wooden screen, and an outer glass pane, Okawood provides shade and thermal insulation. As a direction-selective solar control system, Okawood relies on timber louvers to prevent sunlight from entering the room directly. It provides shading to the interior space thanks to a specific grid pattern of light and shadow that also affects the visual transmission through the pane. The resulting light transmission can vary between 3% and 40%. Given that the wooden structure is fixed and static, it is not possible to obtain a refined control of light transmission, and under certain conditions the wooden filter is not able to protect against glare. The system mostly provides good thermal insulation, shade and privacy, while the wooden grid allows a warm tint of daylight and a unique appearance. For a more advanced lighting analysis and project specific results, we recommend using the Lightsolve program (under development).
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Performance data for all systems in the same category. Comparison to systems in other categories, selected through the matrix filtering process.
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System Description
Okawood is an insulating glass unit comprising of an outer glass pane, a grid interlayer made of thermally modified wood (made from German beech wood) and a gas filling in the cavity, and an inner glass pane with a high performance coating. The maximum size of the panes is 1.7m in width and 3.5m in height, with a maximum pane surface of 7sqm.The panes are similar to other insulating glasses in terms of installation and maintenance, though the thickness of the system must be taken into account when used to retrofit existing installations. Because the system is static, the angle of the timber louvers has to be manufactured at the plant for the specific building it will be installed in. Due to its shading properties (it prevents heat penetration), the system may reduce the building’s cooling loads. |
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