Posts tagged with "Sun Shading":
"The eye-catching screen reflects the innovation and creativity that characterizes the various institutes which it unites."The University of Southern Denmark has a new, shared research and education facility by C. F. Møller Architects that combines four academic research institutes into one shared academic research facility. The various groups are connected by a central canyon-like social space with bridges that span the atrium overhead, linking the institutes. The organization of the building is primarily influenced by SDU’s 1970’s era structuralist campus design by architects Krohn & Hartvig Rasmussen that incorporated reinforced concrete construction and cor-ten steel in a linear site layout. The building envelope is predominantly a glass curtainwall with a custom exterior concrete screen made from pre-fab panels of white CRC concrete (Compact Reinforced Composite, a special type of Fiber Reinforced High Performance Concrete with high strength) featuring circular openings with an underlying solar screen and natural ventilation.
The architects say that the composition of the screen avoids a dull repetitive patterning, yet manages to save costs due to a modular assembly comprised of only 7 unique cast profiles. Data from key views, solar shading, and structural requirements provide parameters to control circular opening sizes (from 4 inches to 6 feet in diameter) and locations with respect to interior functions. Structural integrity of the panel connection points added further challenges to the design of the custom screen. Julian Weyer, partner at C. F. Møller, says a collaboration between the fabricator and installer simplified the process: “mockups were used to qualify the design process and especially the design possibilities and constraints of the concrete screen.” The circular patterning of the CRC screen extends onto the roof where variously sized circular skylights bring daylight into the central atrium. This establishes one of the most successful spaces in the building. “The experience of the day lit ‘canyons’ inside and between the labs feels both intimate and spacious,” Weyer says. The building meets the strict Danish building code requirements for low-energy class 2015, which addresses various environmental criteria including minimal energy consumption, good indoor climate and use of materials with a low environmental impact in a life cycle perspective. While the project was designed roughly at the same time as Henning Larsen Architects’ Kolding Campus, a mere 7-minute walk away, the two SDU projects were not directly influential on each other, however Weyer says both contribute to “an already solid Danish tradition for open ‘learning landscapes’ and innovative educational buildings” citing prior C. F. Møller projects such as the Maersk Building in Copenhagen, the A.P. Møller School in Schleswig and the Vitus Bering Innovation Park in Horsens as notable precursors.
Metal mesh bridges old and new in Davis Brody Bond renovation.For their renovation and expansion of the South African Embassy in Washington, DC, Davis Brody Bond faced an unusual aesthetic challenge. Besides updating the two historic buildings housing the embassy's offices and residence, they were tasked with building a new atrium for public welcoming, public events, and conference rooms—right in between the two older buildings. The architects turned to Cambridge Architectural, a Maryland manufacturer of wire mesh architectural systems. "Davis Brody Bond wanted to have this new building as a very contemporary element between the two limestone buildings," said Cambridge Architectural's Ann Smith. A wire mesh facade seemed a perfect solution to the problem of combining old and new, seamlessly bridging the two masonry structures, and providing crucial sun shading for the glass atrium. The designers selected Cambridge Architectural's Shade mesh, a stainless steel weave of triangular elements with an open area of 54 percent. "Shade was chosen specifically to reduce the sun coming in, and the glare, because there are conference rooms in that front area," explained Smith. "But they still wanted to maintain the views." Shade is also a flexible, almost fabric-like mesh. "The architects really wanted to see it as one continuous piece," said Smith. "Our flexible materials lend well to that. We're able to tension them without tying back to the structure as often." The mesh facade turns three times as it wraps around the top and front of the atrium, twice around the parapet, and once again above the recessed entry. To modulate the tension on the screen, Cambridge Architectural developed a custom attachment system based on their Cambridge Scroll attachment series. "We changed the original concept a number of times," said engineering manager Jim Mitchell. "One of the challenges was that when you first walk in, the mesh runs overhead. We had to put more supports in there, more of our tension brackets to keep it looking horizontal, and to keep the tension as it turned." In this case, that meant locating additional attachment areas on the building and adding steel mounts for the Cambridge Scroll hardware. Cambridge Architectural also worked with Davis Brody Bond on a custom window-washing apparatus. The mesh team mounted the screen further off the glass than was standard, to allow room for a hook-and-pulley system designed by the architects. Davis Brody Bond also modified the window design to make for easier cleaning. Inside the entry, Cambridge Architectural installed frames of rigid mesh to echo the exterior facade while allowing access to HVAC equipment. By partnering with Cambridge Architectural on the South African Embassy project, Davis Brody Bond solved two problems at once. They marked their expansion as clearly contemporary without upstaging either the older buildings or the iconic Nelson Mandela statue out front, and they also made building a south-facing glass atrium possible. "It was a perfect combination of a transparent material that could also shade, and a stainless steel material that was very modern," said brand manager Gary Compton. "When you're inside that space, it makes for a nice welcoming, open area."
Net zero energy, LEED Platinum project raises the bar on eco-friendly office design.For its new headquarters in Los Altos, California, the David and Lucile Packard Foundation put its building budget where its mouth is. The philanthropic organization, whose four program areas include conservation and science, asked San Francisco-based EHDD to design a net zero energy, LEED Platinum building that would serve as a model of cutting-edge green building techniques. “They wanted to achieve net zero in a way that was replicable, and that showed the path forward for others to follow,” said project manager Brad Jacobson. “It was not just a one-off thing, not just a showcase.” The building’s facade was fundamental to its success as an example of sustainable design. “We were surprised at how significant the envelope is, even in the most benign climate,” said Jacobson. “Pushing the envelope to really high performance made significant energy and comfort impacts, and could be justified even on a first-cost basis.” EHDD began by considering the building’s siting. Because the street grid in Los Altos is angled 40 degrees to the south, orienting to the street would result in a long southwest elevation. The architects asked daylighting consultants Loisos + Ubbelohde what penalty this would entail. “They said you have to keep all solar gain out of the southwest facade; if you do that, the energy penalty will be in the realm of less than five percent,” recalled Jacobson. “But you really have to do an excellent job on sunshading. That was our mission.” EHDD designed deep overhangs over much of the facade’s southwest face, and added balconies and shade trees for additional protection. Where the glazing remained exposed, they installed external movable blinds from Nysan that operate on an astronomic time clock. “The blinds worked really well,” said Jacobson. “We were surprised how easy they were to commission and get working, and how relatively robust they are.” Thermal bridging was another area of concern for the architects. EHDD worked with Atelier Ten on thermal modeling of the wall, and discovered that any metal stud wall would sacrifice performance. They opted instead for wood stud construction, and switched to 24 on center framing to reduce thermal bridging through the framing structure. For insulation, the architects added one-inch external mineral wallboard from Roxul. On advice from structural engineers Tipping Mar, they installed FRP plates to separate external elements like balconies from the main structure. Because of the building’s location, EHDD did not initially consider triple glazing for the Packard Foundation offices. “We wrote it off at first,” said Jacobson. “We thought, that can’t be cost effective in this climate.” But Integral Group’s energy analysis convinced the design team otherwise. The improvement in comfort allowed by triple element windows from Serious Materials (now Alpen HPP) was such that the architects were able to eliminate a planned perimeter heating system, resulting in an estimated savings of twice the cost of the glazing upgrade. “It’s a really good envelope,” said Jacobson. “We did heat sensor testing of the building, and you can really see that it’s working as it’s supposed to. You don’t see the studs, and the windows are not leaking a lot of heat, so that’s been a real success.” The architects clad the building in local and sustainable materials, including FSC-certified western red cedar, stone sourced from within a 500-mile radius, and architectural copper. “Architectural copper is a really interesting material,” observed Jacobson. “It’s actually about 80-90 percent recycled because it’s valued. It doesn’t need refinishing and it patinas nicely. For a building being built to last 100 years, it has a good shot at never needing to be refinished or replaced.” Jacobson summarizes his firm’s approach to the design of the Packard Foundation headquarters as “Passive House light.” “At the same time we were doing a Passive House for a climate science researcher we’d worked with in the past,” he said. “We were working on both and learning from each. It’s a different type of building, but a lot of the same principles apply: good air sealing, eliminating thermal bridging, and pushing the envelope further than you think makes sense.”