Posts tagged with "glass curtain wall":
Portland-based studio OFFICE 52 Architecture designed the new 109,000-square-foot interdisciplinary Nano-Bio-Energy Technologies Building at Carnegie Mellon University with a glass facade that plays with form, texture, and color. The skin that lines the north wing of the Sherman and Joyce Bowie Scott Hall features a range of vibrant materials: dichroic glass, clear and frosted glass layers, and a micro-thin layer of metal oxide created by a process that echoes the nanotechnology work taking place in the facility. “It all has to do with photons, which is essentially light. We wanted to give the building a timeless quality in terms of the custom nanotechnology-inspired frit motif juxtaposed by the dichroic glass,” said Michelle LaFoe, principal of OFFICE 52.
In effect, Scott Hall’s curtain wall creates spaces that glow with light that has passed through the glass layers and has diffused into a plethora of colors—from warm amber to cool grape to saturated cyan, depending on the wavelength of the light beam. Lending the building an aura of luminance, a rainbow of color changes transpires throughout the day according to the angle the sun moves through the glass. These qualities are created by Schott AG fins—vertical in Narima Orange and horizontal in Narima Blue|Gold. Both are laminated between Vitro Starphire low-iron glass using DuPont’s SentryGlas laminate, a clever combination paired with a custom frit that allows birds (who naturally have a tetrachromatic visual system with a heightened color perception) to see the color in the dichroic glass. Together, the dichroic fin colors and the ceramic glass frit’s printed pattern with a custom subtle gray is what the birds see, ultimately functioning as a safety feature.
The structure is one of the first research-grade clean facilities in the country to be certified LEED Gold, a feat that both partners attribute to the collaborating engineers and fabricators: “Innovation was most easily achieved when we worked together to fabricate custom fins. Collaborating with the engineers (Arup) and the dichroic glass manufacturer (Schott AG) is an example of collaboration to get the best use of the best products,” said Isaac Campbell, principal at OFFICE 52.
Design Architect: OFFICE 52 Architecture
Architect of Record: Stantec
LEED Consultant: evolveEA
Curtain Wall Glass Manufacturer: Viracon
Curtain Wall: United Architectural Metals
Dichroic glass fins: Schott AG
Fabricator: Triview Glass
Installer: D-M Products, Inc.
Insulated glass units fabricator and manufacturer: Viracon
A research center in Manhattan gets a custom facade solution for energy efficiency and user comfort.Ennead Architects and Heintges & Associates recently completed construction on the 475,000-square-foot Belfer Research Center, Weill Cornell Medical College’s latest expansion to Manhattan’s Upper East Side. The building’s facade includes a unique double skin system on the southern face to define the medical campus’ identity, provide ample natural light without glare to the laboratory spaces, and create a highly efficient envelope. Heintges and Ennead previously worked together on the neighboring Weill Greenberg Center in 2007, said Todd Schliemann, partner in Ennead Architects and designer of both WCMC’s Weill Greenberg Center and new Belfer Research Building. Among the strategies employed in that project was the use of custom ceramic fritting to cut down on sun loading and glare. The team repeated that strategy at Belfer, applying ceramic frit to both sides of the building’s outer curtain wall. The exterior of the outermost layer features a white frit pattern designed to reflect sunlight, while a black frit pattern on the interior surface helps reduce glare and increase visibility through the glass. The double curtain wall produces a chimney effect that reduces cooling loads. For insulation, the inner layer is composed of argon-filled insulated glass units. “We conducted a lot of thermal analysis to minimize bridging through the outriggers,” said John Pachuta, a partner at Heintges. The framing system for the inner wall is thermally broken; a layer of mineral-fiber insulation behind the frame helps improve performance. Permasteelisa manufactured the 5-foot units in its Montreal facility. Glass from BGT was treated with an Interpane coating, and outrigger connections were affixed to the frame every 5 feet. The outriggers also extend to support the outer skin. For the outer wall, unitizing the unique geometries helped maintain the building schedule, despite its complex appearance. “We learned that even with a subtle shift in plane, you can still use standard parts and pieces,” said Schliemann. The team was able to reduce the number of IGUs and achieve a more monolithic appearance by using larger, 10-and-a-half-foot panels, ultimately requiring fewer joints. The grid breaks into 21-foot repetitions, in order to accommodate window washing balconies that also provide faceted cavities in the exterior curtain wall. The cavity between the two skins measures between 18 and 25 inches to accommodate an aluminum catwalk, which is supported by the inner wall’s outriggers. Access points to the catwalk can be reached from the interior for cleaning and maintenance. With increasingly erratic environmental conditions in the Northeast corridor, the entire system had to be secure yet resilient. “We considered having support members starting from the base building structure—from the perimeter beams or columns to extend through the inner curtain wall—but to reduce thermal bridging it was more effective to have outriggers extend through the weather enclosure,” said Pachuta. “Instead, steel outriggers support the catwalk and outer screen wall that are directly attached to the mullions of the inner curtain wall.” Mullions of the inner curtain wall are reinforced with steel, and are anchored to the outer wall at the edge of each unit. The faceted cavities produce good ventilation, but also leave the protected areas open for pigeons to nest. En lieu of standard bird wire, the team developed a custom steel frame with tensioned, horizontal stainless steel rods ¾ inches apart. Though the system keeps the sky rats at bay, the wire is no wider than a bicycle spoke and does not impede views from inside.
A bespoke aluminum building skin transforms an abandoned war bunker into a high-performing boutique hotel.Restoration hotelier Unlisted Collection recently acquired a historically listed, vacant municipal building in London’s East End that served as a set favorite for film luminaries like David Lynch. The 1910 Edwardian fore building and its utilitarian 1937 addition had served as the town hall of Bethnal Green before World War II. In order to convert the complex into a boutique hotel, Unlisted hired London-based architecture practice Rare and tasked the firm with designing an addition to the existing buildings to add space for more guest rooms and amenities, while unifying the three disparate elements into a single entity. Rare directors and founders Nathalie Rozencwajg and Michel da Costa Gonçalves answered this last charge with an ornamental screen facade that visually ties together the historic and modern buildings while also improving user comfort and environmental performance. “The yellow brick facade of the 1937 building wasn’t finished due to the outbreak of the Second World War, when it was repurposed as a bunker,” Rozencwajg recently told AN. Since the building had suffered no major damage during the war, the designers had to move forward while abiding by the English heritage guidelines for preserving historical structures, including the decorative Eduardian facade along the street front. To expand square footage and enable the building’s function as a hotel, the team designed a fourth-level add-on for additional guest rooms. The addition is enclosed in a double-glazed curtain wall that is screened by a parametrically designed ornamental skin. Working in a custom-scripted plugin for Rhino, the team designed a pattern for the screen wall derived from an old ventilation grill that they found in the 1937 extension. In developing the pattern, the designers divided the project into three major zones. The uppermost level functions as a brise soleil with a tightly defined pattern that blocks most of the southern sunlight that impacts this part of the building. Toward the center, the pattern is varied, more open in some places and more closed in others to accommodate interior programming—guest rooms feature smaller apertures for greater privacy while the public spaces are clad in a more open screen. At the bottom level, apertures are kept small to provide privacy from street-level passersby. Approximately 980 feet of the building’s surface is wrapped in this screen, fabricated from laser-cut, 4-mm-thick aluminum sheets. Eight 7-by-4-foot panels in varying pattern densities are bolted into a frame that hangs from the curtain wall. At the roof level, the panels were designed to conceal the building’s elevator towers, plenum, and pitched roof profiles. Rozencwajg estimated that unique panel shapes make up 30 percent of the screen system. Each panel was numbered for efficient installation and bolts in each of the panels’ four corners prevent damage from wind and other environmental factors. The modularity of the panel system also provides for future design flexibility. “If you rearrange the space internally and want to reconfigure the facade, you can change out the panels for more or less opacity,” said Rozencwajg. The panels are finished with a metallic powdercoat that changes hue based on the sun’s angle. Since the historical listing prohibited the architects from altering the existing building—including the old sash windows—the new curtain wall had to improve overall building performance. The south elevation features double glazing to minimize heat gain and natural ventilation is enhanced with trickle vents and energy-efficient windows on the new level. The combined efforts resulted in a BREAM rating of Very Good.