Underground pipe work to stabalise temp

[Murray]

Somewhere I read of underground pipe system to stabilise temp. Evidently about 2 mtrs down the earth temp is 20 to 22 deg C all year round.
By burying a qty of pipe at that depth and pumping water through fish tank water temp could be kept stable.
Was it you FF who did this ?
I have searched but cannot find info.
Can someone help with some good links please ?

[Outbackozzie]

FF does it, look up geothermal houses in britain. They drill holes, add pipes, and plumb to the house.

[Ravnis]

From what I understand, geothermal temperature is the average year round temperature of your area. It changes with the distance from the equator,with greater distance meaning a greater temperature drop. This occurs as shallow as 2 meters deep.

http://gladwell.typepad.com/gladwell...se_for_ge.html

This thread might be of use.

[Dufflight]

When I built my next house I'm going to install pipes under the ground. Heat from the ceiling leaving the roof pulls air from the rooms and in turn pulls air from under the ground. Like having free air con that uses no power. Green houses can be set up to use the same thing for cooling. And FT's seem to respond well to using underground pipes.

[Hamish]

Hey FF - did you get your underground cooling system working?

[Jason Palenske]

It's called geoexchange and yeah it is in FF's thread of how he did it. It's getting pretty common here in the states.

[fishfood]

Yea it was me havent realy tried it yet as the ground temp is close to tank temp13.5 deg atm on the first test run seems to make a difference i think to realy work you would need a lot more pipe and deeper than i have but connected to the freezer system as well i think i can give the trout a few more weeks because as it is here one or two hot days then back to cold for two weeks .
1 oclock yesterday 9 deg and a foot of hail on the hill a mile away

[organicusrex]

http://sunnyjohn.com/

The answers are in here but these folks aren't the best at explaining themselves. You'll have to chase a bunch of the links pertaining to greenhouses and "SHCS" (subterranean heating and cooling system).

It's worked well for them in the American southwest where daytime summer temps exceed 110 degrees F and the nights drop as low as 35 deg. F.

[fishfood]

My experiment had only limited success it needs to be a lot deeper and a lot larger [as the ground warmed up it had little effect] so i will just leave it there for the archaeologists to find in 500 years

[Dufflight]

You'll have archaeologists in 500 years telling people they used to grow fish in pipes burried in the ground because they find pipes with fish poo in it.

FF I can't remember the size of the pipe you used. Can it be hooked up to your shed and air get pulled through it. Interested in how it cools air flow for buildings.