PHOTOVOLTAIC ARRAY
The photovoltaic array system at IAAAP captures solar energy to create electricity, thus reducing power costs for the administration building. Together with a geothermal system, the photovoltaic system allows IAAAP to heat and cool its administration building exclusively with renewable energy sources. (Photo by Linda K. Loebach, JMC Public Affairs)
geothermal system is being used to cool the administration building.
Te IAAAP geothermal system incor-
porates a vertical, closed, ground-loop system. (See Figure 1.) Vertical loops, used where the soil is too shallow for trenching, minimize the disturbance to existing landscaping. In a vertical system, holes approximately 4 inches in diameter
are drilled about 20 feet apart and 100 to 400 feet deep. Two pipes are inserted into these holes and are connected at the bottom with a U-bend to form a loop. Te vertical loops are connected with horizontal pipes—the manifold—then placed in trenches and connected to the heat pump in the building. Iowa’s verti- cal system required 117 holes, or wells, which initially were intended to be drilled to 185 feet deep but ended up at 182 feet deep because of a hard layer of earth at the greater depth.
Geothermal is clean and sustainable, and its potential is everywhere. At 20 feet below the ground, even cold earth contains heat.
DOD HAS INITIATED AN AMBITIOUS GOAL OF PRODUCING 25 PERCENT OF ITS ENERGY FROM RENEWABLE SOURCES BY THE YEAR 2025.
IAAAP also installed a photovoltaic system that uses solar panels to convert sunlight into electricity. Both of these systems allow IAAAP to heat and cool its administration building exclusively with renewable energy sources.
“Te completion of these projects starts Iowa on its first step of energy conserva- tion using green technologies,” said Leon Baxter, chief of the Operations Support Division at Iowa.
“Trough these projects, Iowa is helping the Army gain ground in the net zero
energy campaign,” said Dennis R. Lacy II, energy execution project manager with the U.S. Army Corps of Engineers, who pro- vided specialized support on the projects.
KENTUCKY SUN AND EARTH Additionally, Blue Grass Army Depot in Richmond, KY, introduced geothermal heat source pumps and solar photovoltaic panels to the installation through a util- ity energy services contract (UESC), a third-party contract whereby utility com- panies execute energy-related projects or programs with little to no capital invest- ment from the installation.
One of the UESC projects provides 30 tons of cooling load from geother- mal ground-source heat pumps for the health clinic and the Morale, Welfare and Recreation golf pro shop and office space. Tis particular project will reduce British thermal unit consumption in these three facilities and is expected to save the installation $1 million during the next 10 years.
In April 2014, solar photovoltaic panels, which produce 31 kilowatts of electric- ity, were installed on the Armed Forces Reserve Center and Field Maintenance Shop. Blue Grass estimates its renewable energy to be nearly 4 percent for FY14.
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LOGISTICS
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