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COUNTY HOME SCHOOL

Microturbine Demonstration Project

Demonstrating how emerging energy technologies, like microturbines, can work in real applications to boost energy efficiency and minimize air pollution.

The County Home School’s Microturbine:

• Will generate about 5% of the school’s electricity needs.

• Will provide supplemental heat to the campus.

• Estimated to result in about $8,000 of annual utility savings for the County Home School at current natural gas and electricity rates.

• Is a demonstration of Hennepin County’s commitment to promote alternative sources of energy to power our buildings.

How Does the Microturbine Work?

A 60-kilowatt microturbine was installed in 2005 to generate electrical power and heat for the Home School campus. The microturbine is fueled by natural gas, which powers the turbine, and turns a generator to produce electricity. The hot exhaust air created in this process is recovered and used to heat water. This water is used for hot water needs throughout the campus.

Microturbines:

• Create reliable electricity and heat on-site.

• Ultra low emissions. The exhaust contains few nitrogen oxides, or sulfur dioxides, the primary cause of smog.

• Achieve up to 80% efficiency with heat recovery. A traditional power plant achieves about 35% efficiency.

35%

Total Remaining Efficiency for End User

80%

Total Efficiency with Heat Recovery for the Home School

Usable Recovered Heat

To Learn More About Microturbines

HENNEPIN COUNTY

• Visit www.hennepin.us

key word search: microturbine

for additional information and websites

U.S. DEPT. OF ENERGY’S DISTRIBUTED ENERGY PROGRAM

• www.eere.energy.gov/de

XCEL ENERGY

• www.xcelenergy.com search: microturbine

CAPSTONE MICROTURBINE CORPORATION

• www.microturbine.com

• Manufacturer of the County Home School’s microturbine

100%

Power Plant

Efficiency Losses after Generation

Microturbine with Heat Recovery

Additional Losses Transmission & Distribution

100%

Heat Exchanger -

exhaust heats water

Microturbine -

Natural gas electricity powers

Efficiency Losses after Generation

burns to turn turbine

the school campus

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Image | Microturbine Demonstration Project



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