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Passive Solar Cooling in the Desert - Page 2

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Posted by Auntie Em on September 12, 2004, 3:22 am
 

Nope, "none".

As for using PV as an emergency backup.  It doesn't make sense to buy
a $,000 PV system versus a $00 generator to use it probably less
than an hour a month.  Although in theory, I like the idea of PV
better.

Em
The first half of our lives is ruined by our parents,
 and the second half by our children.
                                --- Clarence Darrow
(make that YOUR children).

Posted by Michael Jenkins on September 13, 2004, 7:16 am
 
On the surface, the generator is cheaper.  Then figure in the cost of the fuel,
the fuel storage, etc.

For a PV system, the "fuel" is sunlight.  No cost for use.  Storage is in the
form of batteries, which are reusable to a point.

The cost comparison?  The generator will need repairs. The PV system has no
moving parts.  Even having a PV system, you can still have a generator for
emergencies.

MikeWJ



http://www.geocities.com/mwjenkins001/

Posted by N. Thornton on September 12, 2004, 10:26 pm
 
none. In fact since youll have other cooling methods taking indoor
temp below outdoor, a breeze will only warm it.



earth tubes are good - so I read. If condensation is a problem, run
the cold air thru a heat exchanger. If you must run it with no leccy,
perhaps a funnel shape on the intake end plus a plastic flap so the
air flows one way. Better would be 4 inlet tubes in each dircetion,
each with its own flap valve, and combine them. Wind in any direction
will now provide air flow.

Whole house fan definitely: using the night coolth is key, it is a big
source of coolth. If you must do it unfanned, large (screened and
secured) openings permitting through drafts is the way.

Build underground, much cooler.

shade the whole house exterior, white paint is not 100% reflective.
Simplest shade is a climbing plant. A separate metal screen with plant
is better.

evaporative cooling

lots of thermal mass, lots of insulation

earth tube should give controlled air flow, to ensure it flows in from
the tube, not in through the various gaps in the building.


If youre in a sand desert, isnt sand & cement the logical structure
choice?

house shape: a square house has less outside wall area per floor area
than a rectangular house. A round house has the minimum, but there are
problems with round buildings, so theyre not generally recommended.


I guess water is an issue as well. All used water, as well as wet
wastes, can go through solar stills to extract the water for reuse.
Dry toilets are an option in a hot dry climate. Water may limit the
use of evaporative cooling.

A central room in the house with its own small evap cooler could take
that room temp down below that in the rest of the house. Perhaps you
can set the house up with 2 temperature zones, one inside the other.


I would imagine an exterior garden wall would shade some ground around
the house, thus cooling the house a little too - Ive not played with
this though. You can build walls with sand and cement, or even shit
and cement if youre scarily daring.


Regards, NT

Posted by N. Thornton on September 13, 2004, 8:59 am
 bigcat@meeow.co.uk (N. Thornton) wrote in message


correction, shit and sand - not that youre likely to use it!

NT

Posted by Michael Jenkins on September 13, 2004, 7:16 am
 If you're serious about concrete, try the folks at Monolithic Domes,
http://www.monolithic.com/ .  They're headquartered in Italy, Texas.

MikeWJ



http://www.geocities.com/mwjenkins001/

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