Snap - August/September 2011 - (Page 28)
Sunblock for Buildings
totally glazed buildings are like bare skin on the beach — they need some sun protection or they will fry. With clearer, high-performance glass, buildings can appear almost totally transparent without sacriﬁcing environmental achievements. Switchable glass has been around for a decade or more, used mostly for privacy in upscale interiors, but Research Frontiers’ Suspended Particle Device (SPD) line of Smart products speciﬁcally addresses facade glazing for improved daylighting responsiveness. A continuous miniscule electrical current keeps the glass clear in pleasant conditions but can be switched oﬀ to darken the glass to a lower visible light transmittance. Another trend, typiﬁed by the LightLouver product, is to ramp up the eﬃciency and capability of interior blinds, particularly venetian blinds, to block unwanted sun, prevent glare, and bounce good daylight farther into the occupied zone. —Russell Fortmeyer
in a classic school design, such as at VMDO Architects’ Manassas Elementary, in Manassas Park, Virginia, LightLouver’s
horizontal, reﬂective louver system can be installed along the top third of the window, with conventional blinds or shades provided in the lower vision plane.
$ = value, $$ = mid-range, $$$ = high-end
love’r or louver
manufacturer: Kawneer performance: Oﬀ-the-shelf
exterior louvers in 6" to 14" depths price range: $ applications: Kawneer’s Versoleil lightweight shading products can be integrated into a curtainwall in either vertical or horizontal conﬁgurations, with each louver blade snapping into a common bracket type. You can further tune the blades in angles of 5-degree increments. Solvent-free powder coating is an option.
manufacturer: LightLouver performance: 1' vertical height can
daylight a 14'' perimeter space. price range: $ applications: The LightLouver product blocks unwanted sunlight and redirects daylight deeper into buildings. It’s good for spaces with smooth ceiling planes and where the product can be installed at least 7' above the ﬁnished ﬂoor. Since it’s akin to a venetian blind, it can be installed in existing buildings with little intrusion.
manufacturer: Okalux (Schott) performance: Aluminum mesh
version can achieve a Solar Heat Gain Coeﬃcient between 8 and 18. price range: $$$ applications: Okalux’s Okatech product has been used on projects including the Seattle Library. It has a three-layer glazing system that includes the mesh, louver, or perforated metal panel in the outermost cavity, which blocks highangle sun and allows low-angle sun for winter solar gain without signiﬁcantly impacting view.
manufacturer: Colt Group performance: Spans of nearly 12' price range: $$$ applications: Colt’s line of Shadoglass
photo credit: INTRO IMAGE BY SAM KITTNER
glass louver systems oﬀers many options, one of which includes photovoltaics laminated between two glass panels. Although a premium product, combining extruded aluminum shading devices with energy production can prove cost-eﬀective, as the product performs double-duty.
28 | snap | august/september 2011 | sweets.com
= eco-friendly attributes
Table of Contents for the Digital Edition of Snap - August/September 2011
Snap - August/September 2011
Case Study: Education
Green Product Roundup
Walls & Wallcoverings
ENR Cost Reports
Regional Focus: Southeast
Live & Learn: Ceu Courses
Trade Show News
Partners in Design
Snap - August/September 2011