Papercreters: [papercreters] Re: Earth tubes

Tuesday, March 3, 2009

[papercreters] Re: Earth tubes

Go to Earth Tubes2003-01-07GirjaSharan.pdf on
http://www.builditsolar.com/Projects/Cooling/passive_cooling.htm#Other
This is a paper on ground tubes.

Allso look at Analysis, Design, and Prelimnary Testing of Solar chimney for Residential
Air-Conditioning Applications, By the Univsity of Nebraska.

And http://www.builditsolar.com/Projects/Cooling/EarthtubeNotes.htm

Gary DeBerg

--- In papercreters@yahoogroups.com, "Janoahsh" <janoahsh@...> wrote:
>
> Hi Neal,
>
> Depending on the composition of the soil and the difference in temperature,
> the ground will absorb heat from the warm air passing through the tubes at
> different rates. If the ground is insulated above, as in PAHS, the ground
> will hold this accumulated heat and store it so that cold air passing
> through the tubes in winter will be warmed. This is great because it
> preheats fresh air in winter and reduces or eliminates the need for heating
> in winter, but if it warms too quickly in summer it ceases to cool the hot
> air.
>
> Janosh
>
> _____
>
> From: papercreters@yahoogroups.com [mailto:papercreters@yahoogroups.com] On
> Behalf Of Neal Chabot
> Sent: Sunday, March 01, 2009 1:00 AM
> To: papercreters@yahoogroups.com
> Subject: Re: [papercreters] Earth tubes
>
>
>
> I don't understand what is meant by "ground heat saturation" when it is
> cooling that is being discussed. Of course hot ground will not provide
> cooling, but do you plan on heating the ground? At a certain depth the
> ground has a relatively constant temperature. Naturally as the temperature
> rises and it gets hot outside, at a certain point the heat is greater than
> the coolling that the ground can provide through basement walls. That is
> why if there is sole reliance on earth tubes there has to be some
> calculations of heat transfer and an understanding of limitations..
>
>
>
> Neal
>