20 MILES OF GEOTHERMAL PIPE IS UNDER EDMOND’S PUBLIC SAFETY CENTER

Below is a link to a story published in the Oklahoman highlighting how underground geothermal systems can be environmentally friendly and save municipalities money while delivering a higher level of heating and cooling efficiencies. The article is a very good representation of the geothermal project in Edmond, Okla., however high-density polyethylene (HDPE) pipe was used, not PVC. 

Original article written by Diana Baldwin, Staff Writer for The Oklahoman.  

— Property circling the city’s new public safety center at First Street and Littler Avenue will hide 20 miles of black PVC pipe that the project manager describes as looking like spaghetti running underground.

“If we could see three- dimensionally into the ground, we would be scared, wouldn’t we?” said Wes Brannon, project manager for Frankfurt Short Bruza architects and engineers.

The PVC pipe is part of a geothermal system where 101 wells will be used to heat and cool the new 70,000-square-foot public safety center instead of a typical heating and air conditioning system.

The new home of police headquarters, the 911 communication center and emergency management operations is the third city-owned building to use a geothermal system.

The Mitch Park YMCA and the Cross Timbers Public Service Center were the first two city buildings to use geothermal energy, which uses the earth’s relatively constant temperature to provide heating and cooling for residential and commercial buildings.

Workers look at a portion of 20 miles of pipe that is running through downtown underground, making up 101 geothermal wells to heat and cool the new public safety center. PHOTO DAVID MCDANIEL, THE OKLAHOMAN David McDaniel - The Oklahoman

Workers look at a portion of 20 miles of pipe that is running through downtown underground, making up 101 geothermal wells to heat and cool the new public safety center. PHOTO DAVID MCDANIEL, THE OKLAHOMAN David McDaniel – The Oklahoman

In Edmond’s system, water is circulated through plastic pipes buried beneath the earth’s surface. During the winter, the fluid collects heat from the earth and carries it through the system and into the building. During the summer, the system reverses itself to cool the building by pulling heat from the building, carrying it through the system and placing it in the ground.

“A lot of people don’t understand geothermal,” said Glenn Fisher, Edmond Electric director. “There is nothing magical about it. No abracadabra about it. You are just changing one heating and cooling system for another. It’s not magic by any stretch of the imagination.”

The advantage of a geothermal system is it is cost-effective, reliable, sustainable and environmentally friendly, city leaders said.

The public safety center geothermal system will cost $1.25 million.

A manifold in the header box connects 101 geothermal wells in downtown Edmond that will be used to the heat and cool the new public safety center. PHOTO BY DAVID MCDANIEL, THE OKLAHOMAN David McDaniel - The Oklahoman

A manifold in the header box connects 101 geothermal wells in downtown Edmond that will be used to the heat and cool the new public safety center. PHOTO BY DAVID MCDANIEL, THE OKLAHOMAN David McDaniel – The Oklahoman

Brian Sauer, director of mechanical engineering for Frankfurt Short Bruza, said the public safety center will recoup the cost two or three times faster than most similar systems because the building will run 24 hours a day. The average building has a payoff in the five- to 10-year range.

“This building will pay back faster because the building never really sleeps,” Sauer said. “A typical office building runs eight hours and gets a break. This building will get a payback in a couple of years.”

The system will save energy and reduce the city of Edmond’s electricity costs.

Fisher estimates the geothermal system will save between 25 and 35 percent on electrical costs. He said he hasn’t calculated an exact dollar figure.

About 72 percent of Edmond Electric’s budget goes to wholesale energy costs.

“It helps us shave our summer peak,” Fisher said. “OMPA (Oklahoma Municipal Power Authority) billing requires you to pay a certain percentage of the peak the year round. Anything that shaves the peak helps the year round.”

The public safety center geothermal system has been a challenging project.

Sauer estimated 50 architects and engineers at Frankfurt Short and Bruza played a role in the design of the two buildings that will make up the $28.6 million public safety center complex.

A second structure, the former Edmond Electric building, is being renovated to give the police department the 15,000 square feet of space it needs for laboratory work and to store evidence.

Voters approved in 2011 a half-cent sales tax to build the public safety center.

Sauer said about 10 engineers worked on the mechanical design of the buildings.

“This is a large effort, a challenging project because of the lack of space and the functions of the building are unique, totally different.”

The spec book for the design of the public safety center is one of the largest composed by Frankfurt Short Bruza.

“I think this is an entertaining project with challenges and sustainable technology,” Sauer said. “We have had the support of the city of Edmond. On some projects, people look for ways to save money by not doing this system. It is good to have their support.”

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