Candor Construction Group &

Alternative Energy Associates

Presents

GeothermalHeating & Cooling

www.candorconstruction.comwww.altenergy1.com

The Basic’s Of

Geothermal - It’s What’s Underneath that Counts!

The earth is like a solar battery absorbing nearly half of the sun’s energy. The ground stays a relatively

constant temperature through the seasons, providing a warm source in winter & a cool heat sink in

summer.

4% absorbed by clouds.

17% reflected by clouds.

6% reflected by surface.

19% absorbed by water vapor, dust

46% absorbed by ground

Space

Atmosphere

Earth

100%

U.S. Dept. of Energy

Geothermal Systems ~ Introduction & Overview Geothermal Systems ~ Introduction & Overview

It’s a Heat Source in Winter…

Minus 40Fin winter

70F

A Geothermal System cools the ground in winter & transfers the heat into the building…

40-60F

Geothermal Systems ~ Introduction & Overview Geothermal Systems ~ Introduction & Overview

Insulating layer of earth

It’s A Cool Place to Dump Heat in Summer

Plus 100F in summer

70F

40-60F …and cools the building in summer by rejecting heat to the ground

Geothermal Systems ~ Introduction & Overview Geothermal Systems ~ Introduction & Overview

Insulating layer of earth

Air Temperature vs. Ground Temperature

0102030405060708090

100

J F M A M J J A S O N D

Ground Air

Vapor / Compression Refrigeration Cycle

Geothermal Benefits• Free and Renewable Energy• Quiet operation• Safe – all electric• Increased Comfort• Substantial Energy Savings• Reliability & longer life expectancy• Lower maintenance• Less impact on the environment

Typical Home Energy Usage

Htg & AC62%

DHW21%

Appl11%

Lights6%

Typical Home Energy Usage

Htg & AC62%

DHW21%

Appl11%

Lights6%

Free Earth Energy

53%Htg & AC

18%

DHW12%

Appl11%

Lights6%

With a Geothermal System

System Materials & Components

• Ground loop– Plastic pipe – high density polyethylene which is a

higher grade than natural gas pipelines– Standard 50yr warranty on pipe from Manufacturer– Heat fusion method of joining pipe & fittings – very

reliable method which makes one continuous pipe– Antifreeze heat transfer solution-Food grade– Small pumping station-low energy consumption and

reliable components– 200 year theoretical life expectancy of buried pipe

Which Type of Ground Loop?

• All loops are sized for the same results. – Each produces about the same annual operating

costs.

• Choose the most economical loop to install

Which Type of Ground Loop?• Closed loop - Vertical, horizontal, and

pond– Contains 100-150 gallons of fluid

• Open loop – Uses ground water from well– Requires water flow of approximately 1.5 – 2

gallons per minute per nominal ton– Average system uses 500,000 gallons of

water/year

Surface Water/Pond Loops

300 ft slinky coilper ton

4 ft between coils

ConcreteBlocks for

weight

Nylon Cable Tiesto secure blocks

300 ft coil per tonseparated by scrap

pipe

Traditional Coiled Pond Loop- Southern Climates

High Efficiency Slinky/Matt PondLoop - Northern Climates

Heavy Duty PlasticSafety matting

8-10 Bricks forweight

Reverse ReturnHeader

Nylon Cable Tiesto secure Netting

and bricks

3 foot separation

• Least expensive

• Typically requires 1/4 acre pond at least 10-12 feet deep

Single plate / 6 Ton unit 4 – 8 Ton plates / 32 Tons

Horizontal Loop Configurations

Horizontal Loops

2 ft 2 ft

2 ft

2 ft

2 ft

Back-Hoe LoopsTwo-Pipe Four-Pipe Six-Pipe

1 ft

Trenched Loops

2 ft

Two-Pipe Four-Pipe Extended Slinky

• Normally can be less expensive

• Typically requires 300-400 foot of trench per ton

• Or 600-800 feet of pipe per ton

Horizontal loop / fusion

Vertical loops• Requires less area • Typically 3-6 bores of

150-200 feet deep per bore

• One bore per ton of required load

• Sealed with grout to prevent contamination of ground water

One Pair Two Pair Series/Parallel One Pair

Avg Depth

Avg Depth

Avg Depth

When Loops areshallower than

one ton per loop

Vertical loop

Geothermal Equipment Options

Free and Renewable Energy Free and Renewable Energy

150 ft.

100 ft.40 ft.

Earth’s Unlimited Energy SourceEnergy Available: 300,000 Kwh120Kwh demand

Geothermal Sources

• 1. www.geoexchange.com• 2. www.igshpa.okstate.edu (training)• 3. www.geocomfort.com (training)