4 Elements of High-Performance Building Envelopes

Date: 6 April 2018
Copyright:
  • By Meshal AlButhie, Architect | omrania.com
Facade detail of the Capital Market Authority Tower, Riyadh. Joint venture between Omrania and HOK.
Photo source
Facade detail of the Capital Market Authority Tower, Riyadh. Joint venture between Omrania and HOK. | Photo: omrania.com
A facade shouldn’t just dictate how a building looks, but how it works — especially in the harsh climate of Saudi Arabia.

With every project, Omrania strives to design unique, high-performance building envelopes that are appropriate for their context. The envelope must be able to withstand the forces of the local environment and facilitate efficient maintenance. The following case studies illustrate how our work is shaped by what can be easily remembered as the “Four P’s” of successful envelope design:

  • Performance (function and sustainability)
  • Price (affordability)
  • Prefabrication (ease of construction)
  • Post-occupancy (durability and maintenance).

Related: Omrania Presents at ZAK World of Facades Conference

 

Waha Office Building, Riyadh. The enclosure system enhances energy performance and provides visual privacy along with natural light and views. Photo © Hani Al-Sayed / Omrania
Waha Office Building, Riyadh. The enclosure system enhances energy performance and provides visual privacy along with natural light and views. Photo © Hani Al-Sayed / Omrania

 

Waha Office Building

Although the diagonally louvered facade of Omrania’s headquarters, also known as the Waha Office Building, gives the building a distinct appearance, it was designed with energy performance in mind. The configuration of the screen reduces heat gain by deflecting the intense solar radiation typical of our climate.

It was built using a locally produced polycarbonate that helped keep the project budget low thanks to its reasonable price, relatively simple fabrication, and low transportation costs. Between the louvered screen and the glass curtain wall, horizontal catwalks provide additional shading as well as easy access for maintenance.

 

Kingdom Centre, Riyadh. The frameless, double-glazed curtain wall responds to the client’s request for a clean mirror-like elevation that reflects most of the sun’s energy. Photo © Ali Mubarak.
Kingdom Centre, Riyadh. The frameless, double-glazed curtain wall responds to the client’s request for a clean mirror-like elevation that reflects most of the sun’s energy. Photo © Ali Mubarak.

 

Kingdom Centre

The well-known Kingdom Centre, designed by Omrania in a joint venture with Ellerbe Becket, presents a uniquely curved, reflective, almost seamlessly smooth exterior that deflects the energy of the intense sunlight.

In response to client demands for an unobstructed elevation, we developed our design using a frameless stick-type curtain wall fitted with a climate-appropriate double-glazing system.

Ease of exterior cleaning and maintenance was also an important consideration. To facilitate facade maintenance operations, the Building Maintenance Unit (BMU) systems are stored in the tower’s service floors and analytically distributed to achieve a shortened cleaning cycle duration.

 

Capital Market Authority Headquarters, Riyadh. The building envelope consists of insulated glazing overlaid with fins, catwalks, and perforated panels for shading and maintenance functions. Photo © Hani Al-Sayed / Omrania
Capital Market Authority Headquarters, Riyadh. The building envelope consists of insulated glazing overlaid with fins, catwalks, and perforated panels for shading and maintenance functions. Photo © Hani Al-Sayed / Omrania

 

The Capital Market Authority (CMA)

The 80-story CMA tower is currently the tallest building in Riyadh and the centerpiece of the KAFD’s financial plaza. Designed and built through a joint venture with HOK, the building tower features a high-performance solar-control system that mitigates solar radiation.

An external system of fins, catwalks, and perforated panels work in concert to shade the building’s double-glazed curtain wall, thereby minimizing heat gain and internal cooling loads. Energy cost are further reduced by the photovoltaic system installed at the roof of the tower.

Also located on the roof, and at intermediate service floors, are building maintenance unit (BMU) systems that work with the external catwalks to provide access for cleaning and maintenance. With its energy-efficient skin, photovoltaic system, and intelligent infrastructure, the CMA tower is expected to achieve LEED Gold certification.

 

Radisson Blu Hotel and Residences, Diplomatic Quarter, Riyadh. Terracotta facade components combined in various ways are the key to this climatic facade. Photo © Meshal AlButhie
Radisson Blu Hotel and Residences, Diplomatic Quarter, Riyadh. Terracotta facade components combined in various ways are the key to this climatic facade. Photo © Meshal AlButhie

 

The Radisson Blu Hotel

Located in Riyadh’s Diplomatic Quarter, this project features a unique multi-layered facade shading system that reduces energy consumption and merges seamlessly with its physical and cultural context.

The entire envelope is conceived as a screen, using a flexible system of durable terracotta panels as well as terracotta tubes — known as “baguettes” — that form a brise-soleil in front of the double-glazed curtain wall components.

Both terracotta elements were lab-tested to ensure they were durable enough to withstand high UV levels, discoloration, and thermal shock.

Designed specifically for the climate of Riyadh, the facade system works in concert with structural overhangs and terraced setbacks to provide shading, thermal insulation, and an effective rain barrier, while providing balcony access.

The facade was also designed to facilitate maintenance and repair, with concealed aluminum supports that enable each individual panel or baguette to be removed and replaced independently.

Related: Anatomy of our New Hotel Facade System

 

Arriyadh Metro Western Station, currently under construction.  Photo © omrania
Arriyadh Metro Western Station, currently under construction.  Photo © omrania

 

Arriyadh Metro Western Station.

The complex geometry of the Arriyadh Metro Western Station presented a unique construction challenge that required an innovative solution — twice. The original design called for a cladding system of large, double-curved glass-reinforced concrete (GRC) panels that would be individually fabricated to create a seamless form.

When the fabrication and transportation of the panels proved unwieldy, we initially resolved the problem by using a larger number of smaller panels. However, at a later stage, Omrania was asked to reduce the cost of the cladding system by relying on standardized panels as possible.

After performing a thorough investigation involving analytical and synthetic studies along with parametric modeling and algorithmic solutions, we were able to redesign the panel shape and arrangement using a trapezoidal zigzag pattern instead of the original rectilinear staggered pattern.

This allowed us to achieve the desired form and the permitted deviations with care to the edge treatment conditions, joint continuation along the cladding, and the soffit panel configuration. Taking into account the lower fabrication cost and simpler installation, this solution reduced the cost of the cladding by 75 percent.

Related: Metro Station Construction Update

Designing an integrated envelope system that considers performance, price, prefabrication, and post-occupancy is not easy, but we believe it is necessary. And when it’s done well, a high-performing envelope can be as beautiful as any ornament.

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