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Old 02-21-2015, 09:57 AM
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Default Earth Tubes

Does anyone have any practical/hands on experience/knowledge?

I am trying to figure out/understand a few things"

1) is there a chart on what schedule of pipe to use, what diameter, depth to burry, length of run?

2) is there a benefit to cooling AND warming with earth tubes?

3) in a new 'tight' home, do you need to provided dedicated vent's for exhausting the incoming earth tube air (for convection/circulation reasons)

I can't/won't burry them very deep, maybe 3 to 6 feet.

Any experience here is appreciated.

Thank you.
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Old 02-21-2015, 10:43 AM
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I had read about them awhile ago.

Would be interested in practical knowledge as well. From what I recall, they need to be pitched down away from the structure as water will condense out from the cool walls and needs to be able to run away.

Also, the tubes aren't enough to cause air movement, so you either have to have a blower system or solar chimney.

Also need critter protection.

They always seemed like a neat idea to me...
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Old 02-21-2015, 11:25 AM
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Here's a good read. Mite take ya a week to git through it all..

http://mb-soft.com/solar/saving.html
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Old 02-21-2015, 06:36 PM
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It seems to me that type of system would work better to cool your home in hot weather than to warm it in cold weather.

When outside temps are hot, the system would be taking warmer air out of your house, cooling it to 55degF and then adding it back into the house.

But in cold weather, your inside air is presumably already warmer than 55*-- so you'd be taking warm air, running it thru the pipes to get it back down to 55* and then adding it back into your house. Counterproductive. Of course, if you want to keep your home at only 55* all winter, you wouldn't need any other heat source.

It would take a heckuva lot of piping to be effective: the volume of the pipes would have to be a large percentage of the volume of the house to have much of an impact because it takes a good deal of time for the air in the pipes to equilibrate temps, so flow speed must be fairly slow.
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Old 02-21-2015, 07:33 PM
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I have read up at

thenaturalhome.com

I know earth ships use this as well.

Trying to find a way of bringing in fresh air to a new build that will be tight...I know I can do a simple air exchanger for several hundred dollars...would rather be non electric if possible and I am not into opening a window.

We are up north...so houses are pretty closed up for about 6 months a year...so...just seeing if this is viable for us.

...12 v man....ummm...nice article....hmmm.
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Old 02-21-2015, 11:36 PM
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Quote:
Originally Posted by doc View Post
But in cold weather, your inside air is presumably already warmer than 55*-- so you'd be taking warm air, running it thru the pipes to get it back down to 55* and then adding it back into your house. Counterproductive.
IF you were bringing in Fresh air from outside the tubes would warm it UP to 55 before it enters the house.
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