aerofox: (Default)
[personal profile] aerofox
Thursday, they came to start installing my Geothermal heating/cooling system to get me off of Propane and away from that *CENSORED* company! They arrived about 9:00 AM and soon were digging.

Here is a picture of the area they are installing before.

And after they started.

They dug two 5 ft deep trenches and laid plastic piping coiled up in the bottom.

They also used an amazing horizontal boring machine to dig a hole from the connecting trench to the house 200+ feet away! This went under the driveway and a tree.

They used a device which kept track of where the drill bit was at all times. It even told how deep it was!

This help guide the bit to its target, a hole dug next to the house.

Then they pulled two large plastic pipes back through the hole with the bit.

here are a couple pictures of this drill bit. One wicked looking thing!

They still have to finish some of the excavating work as well as repair a 6 inch clay tile they cut through. The part that worries me is the supply and return lines are threaded through the same hole. One warm, the other cold. They are side by side for the 200+ feet from the house to the ground loop. I thought they were supposed to be separated to keep the energy from being lost?

They will return on Monday to finish up the installation. New furnace and new water heater.

More to come! ^_^

Date: 2012-03-03 01:36 am (UTC)
altivo: The Clydesdale Librarian (Miktar's Altivo)
From: [personal profile] altivo
The actual temperature differential between the two lines may be only a few degrees, not enough to worry much about heat transfer through the plastic walls. The tubes in the bottom of the long trench should be made of a heat conductive material, while the supply lines should be insulating material.

I'm more concerned about the shallow trench. Our geothermal field consists of three wells drilled straight down about 80 feet and I'm of the opinion now that it should have gone deeper. Of course soil conditions, water table, climate norms, and the efficiency of the heat pump unit itself all enter into the final specs, so I'm not really qualified to judge from this information.

Up here, a depth of five feet is barely below the normal frost line. Our bedrock, if there is any, is probably 300 feet below the surface, while yours might be just eight feet, I dunno.

Date: 2012-03-03 11:37 am (UTC)
altivo: (rocking horse)
From: [personal profile] altivo
Sounds at least reasonable. I'd still want a deeper ground field but I suppose they should know what they're doing. Did you get any referrals to other installations in your area?

Date: 2012-03-04 12:32 am (UTC)
altivo: From a con badge (studious)
From: [personal profile] altivo
OK, that sounds reasonable, too. Can't wait to see the results.

Date: 2012-03-04 01:33 am (UTC)
altivo: (rocking horse)
From: [personal profile] altivo
They use those boring machines here to place electrical and telephone lines under existing roads and walkways sometimes.

I've seen one of them run amok, too. It happened in Florida, and the robot turned upward in the wrong place and popped up through the middle of an asphalt roadway. Another time the same crew managed to bore through an existing water main, causing quite a little eruption of water and a lot of scurrying about.


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