Posts tagged with "double skin walls":
“We are offering a new type of work environment, fit for today’s world.” - Dominique Perrault ArchitectThe Pont de Sevres Towers were originally completed in 1975 by architects Badani and Roux-Dorlut, and have since been renamed Citylights following a complete re-structuring by Dominique Perrault Architect. The original buildings are a series of typologically modern high-rise office towers within a barren urban context. The renovation plays a key role in Paris’s recent urban expansion toward Grand Paris, now connected to the city’s public transport system and through a series of pedestrian routes providing a link to the new Trapeze district—a post-industrial revitalization where former factories are being reborn as new office and residential spaces. To physically anchor the towers to the city, the architects planned a range of spaces that open to the community via large plazas, gardens, reception areas, walkways, and communal spaces. “We are offering a new type of work environment, fit for today’s world,” said the architects in a press release. Due to an existing hexagonal floor plate and efficient elevator core layout from the 1970’s, reusing the structure yielded a plan steeped in contemporary logic, efficiency, and reality. Daylight bounces off of nearby tower facades, minimizing the difference between daylight quality in units with northward orientations vs. those with southward orientations. To maximize this effect, the architects integrated lighting and reflective cladding to produce luminous massing volumes. Specifically, 3,400 new facade elements were installed on 366,000 square feet of facade area. Furthermore, the complex contains 81,000 sq. ft. of aluminum cladding and 180,000 square feet of glass. Two-thirds of the building envelope is covered with a flat facade framed in a polished aluminum and spandrel panels of colorless enameled aluminum. The other third of the building envelope is wrapped with a folded facade that creates formal bracelets around the towers. The bracelets are set at varying elevations as a compositional strategy in response to the existing massing of the complex. The bracelets integrate ventilation and LED lighting to reinforce a rhythm on the elevation. Along with an impressive mixed-use 16,100-square-foot base designed by Gaelle Lauriot Prevost, the project also added to the cluster of three towers with a fourth “petal” extension, recycling the same geometry for the original 1975 structures. With a similar exterior shell, the structural system of the tower was optimized to have less core space that affords a larger amount of open space. The renovation of the buildings involved increasing all window openings to be nearly two feet taller. All building equipment is organized into a ceiling plenum which geometrically responsive to the rhythm of the facade glazing. Where glazing occurs on the building envelope, a double-glazed system is integrated with 3” enameled aluminum awning strips, motorized based on weather data from a nearby weather station. Citylights has been awarded two environmental certifications: HQE (“Haute Qualite Environmental), and a “Very Good” level BREEAM (Building Research Establishment Environmental Assessment Methodolody) certification. These standards were achieved after a design process that included three dimensional digital modeling to optimize equipment sizing and locations, the detailing of a “breathable” double skin facade, an automated sun protection system, increased natural light through expanded openings, and a chilled beam induction system to optimize thermal comfort. An energy analysis of the project confirms the buildings consume 50 percent less than a similar sized building, and six times less than a conventional commercial building. The chill beams are able to reduce the heating and cooling load by 30 percent. Additionally, 64 percent of the energy demand in the building is covered by renewable energy which covers a significant portion of the heating and cooling load.
RPBW’s active double skin facade kick starts a “new generation” of campus design at Columbia University
Columbia University’s expansion has been selected by LEED for their Neighborhood Design pilot program, which calls for the integration of smart growth principles and urbanism at a neighborhood scale.Renzo Piano Building Workshop (RPBW) is designing four buildings to be built over the upcoming years as a first phase of Columbia University’s Manhattanville campus expansion. The first of these four projects to break ground is the Jerome L. Greene Science Center, a research facility used by scientists working on mind, brain, and behavior research. The facility is ten stories wrapped in nearly 176,000 square feet of building envelope, consisting of transparent floor-to-ceiling glazing. “Columbia’s existing buildings are sited massively on the ground, and the campus— for many reasons—is gated. However, the new Manhattanville campus will express the values of this century: tolerance, openness, permeability, and transparency. It’s a new generation of campus design,” said Antoine Chaaya, the RPBW partner in charge of the Columbia project. An elevated subway track along the east facade generated 88 dB of noise, which needed to be significantly reduced for occupant comfort. To achieve this, the architects created a double skin facade system that was sealed from the outside. It represents the fourth double skin facade developed by RPBW, and the first to include active air circulation, according to Chaaya. “What helped us to create this fourth typology of double skin is the constraint: The fact that it cannot be permeable to the outside. It has to be sealed, and at the same time we have to fight against potential condensation. We solve the problem by active air circulation from the bottom to the top of the building.” The resulting facade system provides superior blast resistance and thermal properties, while reducing sound transmission by 45 dB. The cavity of the facade assembly is 18 inches deep, sized just large enough for maintenance access. Highly purified and dehumidified air is filtered three times and slowly cycled up vertically through the cavity at two feet per minute, a rate that ensures quiet operation and no disturbance to shading devices within the cavity. Air in the cavity cycles at a rate of six air changes per minute, managing heat gain and condensation buildup in the cavity. Variations in the facade are generated from functional responses to solar orientation due to orientation, honestly expressing the interior functions of the building. The result is a sophisticated building enclosure, abiding by a rigorously minimal design aesthetic while nimbly adapting to environmental criteria.