The Metropolitan Nashville Airport Authority (MNAA) has completed the transition to its new geothermal lake plate system.
The project uses the former 43-acre Hoover rock quarry, which has an average depth of 150 feet. At a depth of 50 feet,
the water is 50 degrees Fahrenheit year round. The project takes advantage of that cool temperature by circulating water
through closed looping and geothermal heat exchangers submerged in the quarry to the airport terminal’s central plant,
providing cooling for the entire terminal. In addition to the geothermal system, the project also allows for the use of the
quarry water for landscape irrigation. The quarry system is expected to reduce the airport’s electricity usage by 6,000
kilowatts of peak demand and result in annual savings of 1. 3 million kilowatt hours and 30 million gallons of potable water.
The utility savings to MNAA are expected to exceed $430,000 per year.
Airfield Piping Backfill and Separate Supply and Return
Lines at Manifold
Turning of the Valve