flexiblefullpage
billboard
interstitial1
catfish1
Currently Reading

Unique test facility will help make wind power more feasible

Building Team Awards

Unique test facility will help make wind power more feasible

A new facility at Clemson University makes it possible to test the huge stresses that large-scale wind turbines must be able to withstand.


By John Caulfield, Senior Editor | April 7, 2015
Unique test facility will help make wind power more feasible

The Clemson University SCE&G Energy Innovation Center, where giant wind-power systems can be tested. Photo: Ryan Manchester, Clear Sky Images

This article first appeared in the April 2015 issue of BD+C.

The U.S. Energy Department wants wind power to provide at least 20% of the nation’s energy needs by 2030, compared to 3.5% in 2013. Until recently, manufacturers have not been able to replicate on a sufficiently large scale the stress forces that offshore wind turbines must be able to endure.

In 2009, DOE’s Office of Energy Efficiency & Renewable Energy awarded $45 million—its largest single wind-power grant—to Clemson University to build a facility capable of full-scale, highly accelerated testing of the next generation of wind turbine drive-train technology.

The Clemson University Restoration Institute converted a decommissioned Navy warehouse in North Charleston, S.C., into the SCE&G Energy Innovation Center, where such testing is now feasible. The facility also houses Duke Energy’s 15-megawatt eGrid simulator, which tests and validates the impact of electric equipment turbines on the nation’s aging electrical grid.

The project’s sheer magnitude made it a design, engineering, and construction feat. Much of the equipment installed in the facility had never been used before. With design teams and suppliers in the U.S. and Europe, a considerable degree of planning and coordination was required.

PROJECT SUMMARY
GOLD AWARD
Clemson University SCE&G Energy Innovation Center
North Charleston, S.C.

BUILDING TEAM
Submitting firm: Choate Construction Co. (GC/CM)
Owner: Clemson University Restoration Institute
Architect/MP engineer: Davis & Floyd
Structural/electrical engineer: AEC Engineering

GENERAL INFORMATION
Project size: 82,264 sf
Construction cost: $37.3 million
Construction period: September 2011 to February 2014
Delivery method: CM at risk

“This project took the meaning of complexity to a whole new level,” says Drew Clark, Senior Project Manager for Clark Construction, a Building Team Awards judge. “When you understand the coordination, logistics, and extreme tolerances—fractions of an inch—required to support the test equipment, you get the sense that they were building something of a Swiss watch, not just a building. Very impressive.”

To meet seismic code requirements, over 900 steel H and concrete piles, ranging in length from 40 to 85 feet and weighing more than 400 pounds, were driven—the equivalent of nine miles of pilings.

The testing equipment included 7.5- and 15-MW hydraulic dynamometers that can replicate the severe rotating and bending forces exerted on the drive trains by 300-foot-long wind turbine blades at sea. Controlling these forces required two testing bays with dynamic independent foundations that could accommodate the massive torque of the testing system, plus the weight of the rigs. A single gearbox weighs 341 tons, or the equivalent of a Boeing 747.

Because the test rigs were so deep and embedded with congested rebar—the 15-MW foundation was 42 feet wide by 100 feet long by 15 feet deep—concrete couldn’t be pumped and vibrated. The Building Team specified self-consolidating concrete with chemical viscosity modifiers that allowed the concrete to flow throughout the rebar and formwork without the need for vibration. The concrete was poured in a single, continuous 12-hour run for each test rig.

There’s over 900 tons of rebar in the test bed foundations, bent to nearly micron levels. The Building Team used BIM modeling to identify 8,500 conflicts in the foundation before construction.

The Building Team also designed an anchor system so turbines could be moved around and repositioned during testing. Four hundred anchor sleeves and 15 assembled arrays were installed; each was measured during fabrication, assembly, setting, and as-built condition.

One anchoring assembly is the 15-MW Load Application Unit (LAU), also known as “Death Star.” The LAU ring, which had to be transported 250 miles in four pieces to the site, required 96 6.5-foot-long tubes. In full field operation, one million pounds of steel components will be cantilevered off of the ring and its surrounding concrete structure.

 

Its dynamometers require 22.5 MW of electricity to operate at full capacity, or enough to power 15,000–25,000 homes per year. The facility recovers about 80% of that energy, resulting in energy cost savings of 60.3% and contributing to the project’s LEED Gold certification. Photo: Ryan Manchester, Clear Sky Images

 

Crews laid down 900 tons of rebar in the test bed foundations. Specialty concrete was poured in a single run to make sure the concrete penetrated the rebar without the use of vibration equipment.

Related Stories

Building Team Awards | Jun 12, 2019

Delectable design: A traditional French pastry was the concept behind the Krause Gateway Center

Gold Award: Krause Gateway Center’s striking design takes its cue from the traditional French dessert mille feuille.

Building Team Awards | Jun 11, 2019

Learning by doing: Students took an active role in the design of the Bay Area's d.tech high school

Gold Award: D.tech had been occupying temporary spaces that were hardly suited for design thinking.

Building Team Awards | Jun 10, 2019

Technology showcase: PTC's new digs combine lively workspaces with exhibits for its products and platforms

Gold Award: PTC began its fitout even as 121 Seaport was still under construction.

Building Team Awards | Jun 7, 2019

Fast delivery: Construction of McDonald's global headquarters was completed in under seven months

Gold Award: The building has a remarkably diverse array of spaces that include “work neighborhoods.”

Building Team Awards | Jun 7, 2019

Unifying force: A place where a million Tulsans can connect, one by one

Platinum Award: Gathering Place is a 66½-acre public park and playground serving the nearly one million residents of greater Tulsa, Okla.

Building Team Awards | May 24, 2018

Green machine: Janet Durgin Guild and Commons at Sonoma Academy

Honorable Mention: A college prep school gets an uber-green maker space and cooking lab.

Building Team Awards | May 24, 2018

Good neighbor: Wentz Science Center at North Central College

Bronze Award: A conscientious Building Team takes steps to minimize the impact of this large-scale science center project in a historic neighborhood.

Building Team Awards | May 23, 2018

13 projects earn BD+C's 2018 Building Team Awards

Iowa’s game-changing correctional institution and Chicago’s daring hotel and sports development are among 13 projects to earn honors in BD+C’s 2018 Building Team Awards.

Building Team Awards | May 23, 2018

Engineered for extremes: Talan Towers

Bronze Award: Astana’s shimmering mixed-use towers are made to stand up to the region’s harsh, long winters.

Building Team Awards | May 22, 2018

High-tech haven: The Spark at Washington State University

Silver Award: A ‘teaching in the round’ classroom highlights this innovation hub at Washington State University’s Pullman campus.

boombox1
boombox2
native1

More In Category




halfpage1

Most Popular Content

  1. 2021 Giants 400 Report
  2. Top 150 Architecture Firms for 2019
  3. 13 projects that represent the future of affordable housing
  4. Sagrada Familia completion date pushed back due to coronavirus
  5. Top 160 Architecture Firms 2021