Water Based - Closed Loop Geothermal System
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There are three types of water
based closed loop geothermal
systems: horizontal, vertical and
pond - or under water.
Water based means a mixture of
water and antifreeze is the heat
carrying medium pumped
through the polyethylene
tubing/piping.
The alternative is a direct
expansion (DX) system where a
refrigerant instead of water is
pumped through copper tubing.
based closed loop geothermal
systems: horizontal, vertical and
pond - or under water.
Water based means a mixture of
water and antifreeze is the heat
carrying medium pumped
through the polyethylene
tubing/piping.
The alternative is a direct
expansion (DX) system where a
refrigerant instead of water is
pumped through copper tubing.
Horizontal Ground Closed Loop
This type is usually the most cost effective when trenches
are easy to dig and the size of the yard is adequate.
Workers use a backhoe to dig the trenches three to six
feet below the ground in which they lay a series of
parallel plastic pipes.
Recently the slinky pipe configuration used in closed loop
pond systems has gained in popularity for use in ground
loop systems because they require less trenching are
easy to lay down. A typical 3 or 4 ton unit would need
around 2,500 feet of piping.
Vertical Ground Closed Loop
This type of loop is used where there is little yard space,
when surface rocks make digging impractical, or when you
want to disrupt the landscape as little as possible.
Vertical holes 100 to 450 feet deep - much like wells - are
bored in the ground, and a single loop of pipe with a U-
bend at the bottom is inserted before the hole is
backfilled.
A four ton unit would require approximately 600 feet of
well and 1,200 feet of pipe.
Vertical loops are generally more expensive to install, but
require less piping than horizontal loops because the
earth's temperature is more stable farther below the
surface.
Pond Closed Loop
This type of loop design may be the most economical
when a home is near a body of water such as a shallow
pond or lake.
Fluid circulates underwater through polyethylene piping in
a closed system, just as it does through ground loops.
The pipes may be coiled in a slinky shape to fit more of it
into a given amount of space.
A 1⁄2 acre, 8-foot-deep pond is usually sufficient for the
average home. Since it is a closed system, it results in no
adverse impacts on the aquatic system.
This type is usually the most cost effective when trenches
are easy to dig and the size of the yard is adequate.
Workers use a backhoe to dig the trenches three to six
feet below the ground in which they lay a series of
parallel plastic pipes.
Recently the slinky pipe configuration used in closed loop
pond systems has gained in popularity for use in ground
loop systems because they require less trenching are
easy to lay down. A typical 3 or 4 ton unit would need
around 2,500 feet of piping.
Vertical Ground Closed Loop
This type of loop is used where there is little yard space,
when surface rocks make digging impractical, or when you
want to disrupt the landscape as little as possible.
Vertical holes 100 to 450 feet deep - much like wells - are
bored in the ground, and a single loop of pipe with a U-
bend at the bottom is inserted before the hole is
backfilled.
A four ton unit would require approximately 600 feet of
well and 1,200 feet of pipe.
Vertical loops are generally more expensive to install, but
require less piping than horizontal loops because the
earth's temperature is more stable farther below the
surface.
Pond Closed Loop
This type of loop design may be the most economical
when a home is near a body of water such as a shallow
pond or lake.
Fluid circulates underwater through polyethylene piping in
a closed system, just as it does through ground loops.
The pipes may be coiled in a slinky shape to fit more of it
into a given amount of space.
A 1⁄2 acre, 8-foot-deep pond is usually sufficient for the
average home. Since it is a closed system, it results in no
adverse impacts on the aquatic system.
Alternative-Heating-Info.com
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| Horizonal Closed Loop |
| Pond Closed Loop (Slinky) |
| Vertical Closed Loop |