Hydroformed Shading

A Calibrated Approach to Solar Control

Overview

Authors

Photo of Michelle Siu-Ching Lee

Michelle Siu-Ching Lee

Architect

Behnish Architekten

research@behnisch.com

Photo of Robert Matthew Noblett

Robert Matthew Noblett

Partner

Behnish Architekten

rmn@behnisch.com

Photo of Roman Schieber

Roman Schieber

Associate Director

Knippers Helbig GmbH

R.Schieber@knippershelbig.com


Keywords


Abstract

New approaches to lightweight metal forming have the potential to advance architectural fabrication, particularly in the design and engineering of high-performance building envelopes. For the Harvard Science and Engineering Complex outside Boston, Behnisch Architekten, together with Knippers Helbig, applied a novel application of metal shaped by water in the world’s first hydroformed tensile facade system.

Hydroforming is an industrial cold forming process in which a metal blank is driven into a single mold with hydraulic pressure to form extremely thin parts with exceptional structural stiffness. It has been developed and advanced primarily by the automotive and aerospace industries—where weight to strength ratio has a compound effect on production cost, safety, performance, and energy consumption. Despite parallel considerations, it has not been widely used in architectural applications.

The Harvard screen facade was developed through a rigorous research process to apply hydroforming in a sun shading system that leverages the advantages of this technology, namely lower tooling costs, precise geometric definition, and superior structural properties. Calibrated to the extreme seasonal variations of the New England climate, the system is optimized to temper solar heat gain in the summer while maximizing daylight and solar energy in the winter. The screen is comprised of a series of 12,800 hydroformed panels of 1.5 mm thick (16 gauge) stainless steel, measuring 2.5 x 2.5 ft, each weighing under 10 pounds. The panels are supported by an ultra-lightweight tensile structure with a cross sectional area of just 0.35 in2. Despite its delicate appearance, the shading screen is a crucial component in the comprehensive energy strategy of the new academic building, which opens in 2020.

Introduction

At 535,000 sf, the Harvard Science and Engineering Complex (SEC) unifies and expands multiple science and engineering disciplines in a new centralized location in Allston, Massachusetts. As the primary home

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Background

The sun shading system for the Harvard SEC emerges from the synthesis of three topics that have been widely researched employed in architecture, engineering and manufacturing but rarely combined simultaneously

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Methods and Data

Screen Performance Testing

Because of the uniqueness of the design, several specialized full-scale tests were conducted to validate assumptions and test unknowns.

Dynamic Test

During design and engineering of the external screen, the

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Construction and Maintenance

The screen panels and the tensile components are engineered and fabricated in Germany, and shipped to the site and installed by Permasteelisa North America under Turner Construction. The off-cuts from

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Conclusion

The sun shading screen of Harvard University’s Science and Engineering Complex demonstrates the unique potential of hydroforming technology to create high performance, lightweight, and structurally stiff components. The ability of

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Acknowledgements


Behnisch Architekten: Stefan Behnisch, Michael Cook, Magdalena Czolnowska, Daniel Mazur

Knippers Helbig: Nicola Haberbosch

Josef Gartner: Klaus Reuschle, Reiner Haselmeier, Günter Muller

Edelstahl Mechanik: Philipp Eisele

Transsolar: Linda Lam, Erik Olsen

Turner Construction: James Riley, Tiago Pimentel

Harvard University: Alyssa Hubbard, Joe O'Farrell

Rights and Permissions

References

Barber, Daniel. “The Form and Climate Research Group, or Scales of Architectural History.” In Climates: Architecture and the Planetary Imaginaryedited by James Graham, Lars Muller Publishers, 2019.

Bell, Colin, Caleb Dixon, Bob Blood, Jonathan Corney, David Savings, Ellen Jump, Nicola Zuelli. “Enabling sheet hydroforming to produce smaller radii on aerospace nickel alloys.” International Journal of Material Forming. September 2019, Volume 12, Issue 5, pp 761–776

Bell, C, Jonathan Corney, David Savings, John Storr. “Assessing the potential benefits of manufacturing gas turbine components by utilizing hydroforming technology.” 13th International Cold Forming Congress; 2nd - 4th September 2015, Glasgow.

Braham, William. "Biotechniques: Remarks on the Intensity of Conditioning" in Kolarevic, Branko, Ali Malkawi, ed. Performative Architecture: Beyond Instrumentality. Spon Press, 2005.

Bundesministerium des Innern, für Bau und Heimat (German building material database for assessment of global ecological effects). https://www.oekobaudat.de/(accessed March 25, 2019).

Kang, Beom-Soo , Bo-M Son, Jeong Kim. International Journal of Machine Tools and Manufacture
Volume 44, Issue 1, January 2004, Pages 87-94.

Grynning, Steinar, Berit Time, Barbara Matusiak. “Solar shading control strategies in cold climates-Heating, cooling, demand and daylight availability in office spaces.” Solar Energy, September 2014, Vol.107 (2014): 182-194.

Houska, Catherine. “Facades: The Use of Stainless Steel in Second-Skin Facades.” Council on Tall Buildings and Urban Habitat. Journal Issue III, 2013.

Olygyay, Victor. Design with Climate: Bioclimatic Approach to Architectural Regionalism. Princeton University Press, 1963.

Schlaich, Jorg, Rudolph Bergermann. Light Structures. Prestel, 2004.

Subhashchandra, Pandya Rajen, Bahr Behnam. "Prediction of Variation in Dimensional Tolerance Due to Sheet Metal Hydroforming using Finite Element Analysis." Journal of Aerospace (2006): 563-567.

Zheng, Kailun, Denis J.Politis, Liliang Wang, Jianguo Lin. “A review on forming techniques for manufacturing lightweight complex—shaped aluminium panel components.” International Journal of Lightweight Materials and Manufacture. Volume 1, Issue 2, June (2018):55-80.

Photos by Janis Roykalns, Roman Schieber, and Christopher Karlson.