Energy Efficiency Upgrades Bolling Federal Building...Richard Bolling Federal Building PROJECT SCOPE • Design and built in the early 1960’s • 18 Story office tower with 3 story

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Energy Efficiency UpgradesBolling Federal Building

Paul E. Totten, PE, LEED APSimpson Gumpertz & Heger

BETEC/NIBS10 December 2009

www.helixkc.com

Presentation Outline

• Introduction Energy EfficiencyRichard Bolling Federal Building project scope/objectives

• Basic considerations for energy efficiency• Challenges in design and implementation• Thermal and hygrothermal models and on site

validation methods• Case Study - Bolling Building Curtain Wall System

Upgrades• Questions

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Energy Efficiency

• Means different things to different constituents– Alternative energy– Super insulating– Heating and cooling– Lighting considerations– Daylighting to offset loads– Passive solar – ……..

• Important to accomplish, but complex

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Richard Bolling Federal Building

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Richard Bolling Federal BuildingPROJECT SCOPE• Design and built in the early 1960’s • 18 Story office tower with 3 story annex• 1.2 Million square feet over two city blocks

Typical office tower floors are 50,000sfTower and annex floors are 70,000sf

• Complete modernization while occupied• Total construction cost of $260M

Four Phases over 14 yearsAbatement | Mechanical | Interior Finishes

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Richard Bolling Federal BuildingPROJECT OBJECTIVES• Abate Hazardous Containing Materials • Energy Efficiency• Invisible Construction• Design Excellence• LEED Silver

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Quick overview of scope


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Consideration for Thermal Efficiency

• Exterior glazing• Reduce thermal bridges• Air tighten the enclosure• Enhance insulation with consideration for effect on

existing building fabric• Consideration for placement of fenestration within

enclosure - interface with the wall systems thermal barrier

• Interaction between the mechanical system and the building enclosure

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Design and Implementation - Challenges

• Integration with new systems with original structure• Trades skills• Understanding how the previous design worked• How to alter to improve

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Richard Bolling Building

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Original windows are operable (no longer in use) non thermally broken units with single glazed tinted glass The glazing beads were wet sealed and failing. Caulk was brittle and falling out, water and air infiltrating. Original concept was to reglaze the existing glass and install a storm window with integral blind. We learned that it was more cost effective to replace the window sash with a thermally broken frame and insulated glass. The image above show the mockup of two windows. One with a natural frame and clear low E glass. Another with a black frame, low e tinted glass. The third is the existing condition. While more visible light was desirable, it had a negative effect on the appearance of the building from amn historical perspective. We cjose alternate two with the blcak thernmally broken frame, tinted insulated glass and the low e coating.

Thermal and Hygrothermal Models

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Field Validation

• Thermography• Instrumentation – measure and verify

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Field Validation

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Field Validation

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Field Validation

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Questions

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Documents

Energy Efficiency Upgrades Bolling Federal Building...Richard Bolling Federal Building PROJECT SCOPE • Design and built in the early 1960’s • 18 Story office tower with 3 story