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Earth Pipe Heat Exchanger

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Posted by News on February 3, 2009, 2:15 pm
Using earth pipes with an air Heat Recovery and Vent system, the earth pipe
is usually connected to the heat exchanger raising the outside temperature.
The heat exchanger transfers heat from extracted air into the pre-heat earth
tube air.

The worry is mould and condensation in the earth pipe. A solution maybe to
have the air from the earth pipe recirculating through the heat exchanger -
this air does not enter the house.  The air in the house passes over the
heat exchanger and takes in 10 to 50% fresh air with 90% re-circulated.  Why
have 100% fresh air intake?    Still only one heat exchanger but maybe two

Anyone have comments on this?  Or is coupling two heat exchangers together
the best method?

Posted by Ecnerwal on February 3, 2009, 5:17 pm

If you are not going to use the air from the pipe, makes more sense to
bury tubing, pump water or antifreeze through it, and use an air/liquid
heat exchanger rather than an air/air heat exchanger.

That would pre-warm the outside air, which is the same thing an "earth
tube" does if you happen to live in a climate where it does not grow
toxic mildew.

It does nothing for recovering heat from the inside air being exhausted,
which is a different operation (and what a HRV does).

Cats, coffee, chocolate...vices to live by

Posted by News on February 3, 2009, 5:40 pm

From what I have read, running lots of pipes around a garden to extract heat
doesn't really add up.  How about this, although built for a heat pump.


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