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System Performance | System Description | Case Study |
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System Performance
As a daylighting system, prismatic glass performs according to three main objectives: the minimization of solar heat gains in the summer, the control of glare without darkening the room, and the improvement of light distribution. Fixed prismatic panels constitute a shading device for glass roofs. Sunlight protection is based on direction-dependent reflection and transmission with a pre-defined blocking and transmission span. The blocking area of the system reflects all incoming sunlight outwards. The transmission area is designed so that a maximum level of diffuse daylight can enter the interior. The movable prismatic elements consist of non-specular prismatic panels that reject light incident from any direction along to the longitudinal axis of the prismatic structure because of total reflection. Diffuse daylight coming from the other directions is almost completely let through. The principle of total reflection functions only within a very narrow range, whereby a sun tracking of the louvre’s blades along their longitudinal axis is necessary. The prism blades can be moved into a horizontal position (i.e. laterally 'parked' away) on cloudy days, allowing unhindered vision through the glazing and a maximum diffuse daylight penetration. 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
Siteco’s Prismatic Panels use a molding-injecting technique to create prisms on clear acrylic for the 12mm (.47”) inner panel. The full panels can also have a high specular coating on one surface of each prism with ultra-pure aluminum deposited within a high vacuum atmosphere. The prisms within the inner pane come in multiple types and refract a variety of vertical angles (28, 36, 42, 45, and 54 degrees). The system includes a sandwich that consists of the following layers: glass, adhesive lamination, prismatic panel, adhesive lamination, and another pane of glass, which form a double-glazing unit hermetically sealed to avoid dampness or dust. This makes up a 24mm (.94”) thick system, broken into small square panels that are 206mm (8.1”) wide, placed in panels of a maximum size of 1.8m by 3m (5.9’ by 9.8’), or 1.2m by 3.5m (3.9’ by 12’). Plexiglas 8N PMMA is used to hold the smaller panes together. The prismatic system is set to follow the sun’s course to the extent allowed by geographical and architectural factors. |
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