Passive Cooling and Dehumidification
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  Passive Annual Heat Storage, maintains a nearly constant earth temperature, although near to the Earth’s surface. Under ordinary circumstances that temperature, as the PAHS book explains, is about 70° F. (20° C.) But how do you make it cooler?

It depends on your resources. Winter is a resource. A large body of earth can be cooled as well as heated. The figures are not fully established yet, but in 6 months, heat will travel about 20 feet (7 meters.) Logically, warm bodies of earth and cold bodies of earth should be kept at least 20 feet apart, at their perimeters. And, of course it too needs an Insulation/Watershed Umbrella.

It depends a lot on local conditions at the job site, but that seems to be a good rule of thumb.

The type of heat exchanger you need depends on the goals you are trying to reach. If it’s cooling you are trying to create, upside-down earth tubes, will allow cold air to enter in the winter, and extract heat from the earth.

If dehumidification is your goal, you want the air cooled, and the water condensed out, but then you want the air heated back up again without the water. Here you’d use a counter-flow earth tube within an earth tube arrangement.

Of course that will not cool the earth, so you still need the upside-down earth tubes to cool the earth.

And If you wish to include a cold storage room, it should be separate form the home, and entered from the outside.

Depending on your local conditions, you may need 2 of such counter-flow heat exchangers, one to connect to the upper earth tube of the home and one to connect to the lower earth tube. And air flow may be restricted, so you may have to add fans.

Only a few sites require dehumidification. If you feel you’ll need it, leave room, it can be added later.

    Thanks for your interest.

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