04/03/2006

High-Performance Façades: It’s What’s Outside that Counts (2 of 4)

 

When the sun is high in the sky (summer sun), light shelves block direct sun at both the upper and lower windows. When the sun is low in the sky (winter sun), it can penetrate to the back of the space through the clerestory, preheating occupied space and providing light. Tinted glazing can be used on the lower-view windows; clear glazing can be used at the clerestory level to increase daylight admission.

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DAYLIGHTING FAÇADES

Sunlight Redirection
Sunlight-redirection systems rely on reflection, refraction, diffraction, or non-imaging optics to modify or enhance the distribution of incoming daylight. Benefits include not only the potential to offset lighting requirements, but to improve lighting quality and visual comfort.

Light shelves, one example of a sunlight-redirection system, are horizontal, exterior projections that use a high-reflectance, diffuse, or semi-specular (shiny) upper surface to reflect sunlight to a certain interior depth from the window wall. Between-pane light shelves employ many of the same principles, but are protected between two panes of glass. Laser-cut panels use simple linear horizontal cuts in an acrylic panel to refract light at the juncture of the linear grooves. Prismatic acrylic panels (which increase reflective optical efficiency without mirrored imaging) also work on the principle of refraction to redirect incident sunlight.

Systems using direct sunlight are most effective on the south façade and are designed based on seasonal variations in solar altitude. For moderate and hot climates, daylighting strategies must be integrated with solar-gain control. In the summer, light shelves block direct sun at both the upper and lower windows. In the winter, low sun can penetrate to the back through the clerestory, preheating occupied space in the morning and providing light. Tinted glazing can be used on lower-view windows, while clear glazing can be used at the clerestory level to increase daylight admission.

In all of the above systems, view is distorted or impaired; placement above standing-view height is typically recommended.

Skylight Redirection
These systems, designed for diffuse skylight, are intended to increase overall interior daylight levels with less emphasis on the depth of light redirection. Typical characteristics of anidolic systems include sharp cut-off angles for admitting and delivering light, and very few reflections of light rays when passing light through the system. Holographic optical elements (HOEs) can also be applied to redirect skylight. Tilted-glass HOE overhangs can be placed over north-facing windows so that diffuse daylight is redirected into the building interior. (HOE glazing is still under development.)

Skylight-redirection systems are efficient in climates with predominantly cloudy conditions, urban environments, or other situations where windows or skylights only “see” the sky.

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Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.

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Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.


Mitsubishi Electric’s H2i R2-Series heat pumps provide 100% heating capacity down to 0° F and simultaneous heating and cooling down to -4° F delivering year-round comfort, regardless of climate zone.

Connectrac wireways offer discrete power and technology connectivity in open interior spaces of all kinds; affordably, quickly and with long-term flexibility.



When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.

Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.


Mitsubishi Electric’s H2i R2-Series heat pumps provide 100% heating capacity down to 0° F and simultaneous heating and cooling down to -4° F delivering year-round comfort, regardless of climate zone.

 
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