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System Performance | System Description | Case Study |
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System Performance
Retro reflecting louvers improve upon conventional Venetian blinds by providing protection against low-angle winter sunlight and high-angle summer sunlight, thus avoiding both overheating and glare issues without darkening the interior, as the blinds are kept open. It is indeed possible to keep the slats in horizontal position by combining concave profiles with a microstructured prismatic surface. This provides a good visual transmission through the blinds (≈69% of the glazed area) and a good diffuse distribution of light inside. To control sunlight while letting daylight penetrate, RETROFlex louvers offer a zoned configuration of the slats: in the upper part of the glass the louvers are placed in inverse position (prisms are placed on the convex side of the louver, facing downwards) for active light directing, and in the vision area it uses retro louvers (prisms on the concave side of the louver, facing upwards) for solar and glare control. By forming part of an IGU the system also offers a better thermal performance. 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
RETROFlexTherm louvers are made of extruded aluminum, bent into concave or convex shapes, with the micro-prism structure rolled on the top surface, and a white or glossy coat on the underside (standard finish up to 86% reflective). These louvers are intended to be installed as a fixed inlet in the cavity of an IGU. In terms of dimensions, the width of this unit is 25 mm and its length can be customized. The louver spacing is approximately 56mm. The blinds can be gradually adjusted (lifted, lowered or twisted), which allows multiple louvers to be moved simultaneously, either individually or in groups, depending on the current sun angle and lighting conditions. If necessary, it is also possible to completely open the louvers in both areas to provide free vision, the response time for the up/down switch being 4 seconds. The system can be manual and automatically operated via a switch or remote control. The system can be installed vertically and within roof systems. Energy savings are expected to come from reducing cooling and electric lighting loads. |
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