FACADE OPTIMIZATION. Architect Mike Matson Project Manager, Ratcliff. DE ANZA COLLEGE MEDIAL + LEARNING CENTER Photography David Wakely

Transcription

1 There are a handful of passive downdraft buildings in service worldwide, but we believe the execution of the system at De Anza College s Media + Learning Center to be on a scale and level of sophistication that is wholly unique... FACADE OPTIMIZATION Architect Mike Matson Project Manager, Ratcliff The façade of a building represents a critical confluence of architectural expression and climate interaction. Natural ventilation, daylight harvesting, night time ventilation, glare, views, heat loss, heat gain all of these exist in the myriad of interactions between internal and external environments. Our holistic approach to building energy modeling captures this complexity; becoming an indispensable tool in developing façade solutions that maintain architectural character while delivering on energy, daylight and comfort. DE ANZA COLLEGE MEDIAL + LEARNING CENTER Photography David Wakely

2 CASE STUDY 01: NANJING SUNING PLAZA NANJING, CHINA Client: Suning Real Estate Company Architect: JAHN MEP: WSP Project Size: 2,700,000 ft² Completion Date: The Nanjing Suning Plaza is an architectural ensemble comprising the Nanjing Tower and associated eight-story podium building. The 1,400-foot-tall mixed-use mega tower includes commercial office space, a hotel, residential condominiums and conferencing facilities; the podium houses a retail mall and entertainment complex. Particular areas of study were the façade and atrium space within the podium building. Built Ecology worked closely with the architect, utilizing advanced virtual prototyping techniques to inform the design of the triangulated external shading system and the vortex atria space that extends down from the roof into the retail mall below. 2 3 Rendering JAHN NANJING SUNING PLAZA

3 An overhead view of the plaza building showing the glazed vortex atria that extends down into the retail mall. 21 CFD analysis was used to inform the design of radiant floor heating used to offset the downdraft of cold air at the interior surface of the vortex. 22 Dynamic thermal modeling and daylight analysis were used to optimize the triangulated façade shading scales of the podium building. The scales were oriented to capture beneficial diffuse daylight while providing effective control of glare and overheating associated with direct beam radiation. Daylight analysis of the retail mall was used to inform the design of the exterior shading scales and as well as the spectral qualities of the vortex glazing. NANJING SUNING PLAZA Rendering JAHN Images WSP, Built Ecology (Opposite Page) 2 3

4 CASE STUDY 02: NATIONAL MUSEUM OF AFRICAN AMERICAN HISTORY AND CULTURE WASHINGTON, D.C. Client: Smithsonian Institution Architects: David Adjaye, Freelon Group, Davis Brody Bond, SmithGroupJJR MEP: WSP Awards + Certifications: Anticipating LEED Gold Project Size: 330,000 ft² Completion Date: The National Museum of African American History and Culture (NMAAHC) will occupy a prominent position on the National Mall between the Washington Monument and the Smithsonian s National Museum of American History. The building boasts a host of sustainable design features including a performance-driven façade design, on-site solar hot water and photovoltaic power generation, high-efficiency HVAC systems, a grey water reclamation system and a rooftop garden that will serve to detain and regulate storm water flow to the municipal sewer system. NMAAHC Images Freelon Adjaye Bond/SmithGroupJJR

5 25 These CFD images of the façade indicate the internal glazing temperature for alternative conditioning strategies. The results identify how in the original airflow strategy, cold pockets of air tend to form under the horizontal steps of the façade, creating the potential for localized condensation. The CFD analysis demonstrates the success of a revised conditioning strategy that utilizes relief air to create a thermal buffer at the façade interior. 26 A critical aspect of the project is the building façade, the design of which is being informed through detailed performance modeling. Energy and daylight analysis have been employed to inform the porosity and patterning of the exterior perforated metal screen, while CFD has also been instrumental in identifying and mitigating potential issues of condensation and downdraft at the façade interior. NMAAHC Images Freelon Adjaye Bond/SmithGroupJJR Images WSP, Built Ecology (Opposite Page)