At 07:05 AM 7/13/2009, Dan M wrote:
snip
Because it clearly won't work well at any time but the pre dawn hours in
the desert. The collectors have to be cooled below the dew point. Let me
give a US example. In Las Vegas yesterday, in the heat of the day, the
temperature was 42C, while the dew point was -1C. Even shaded, it takes
tremendous power to keep collectors that cold while deliberately being
exposed to a very hot wind.
Obviously they would not build them this way. Think about
dehumidifiers. In a damp basement this one will put out 33 l of
water a day on 750 watts
http://cgi.ebay.com/FRIGIDAIRE-70-PINT-POWER-DEHUMIDIFIER_W0QQitemZ330340172232QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4ce9cf01c8&_trksid=p3286.c0.m14&_trkparms=65%3A7|66%3A2|39%3A1|293%3A1|294%3A50
Dehumidification: 33.1 Litres/Day
EEV (L/KW/H): 1.6
I have not looked into one for years, but they have been built as
counter current back to the 50s. The cold air dry air is used to
cool the incoming air so the main energy drain is pumping out the
heat from condensing the water.
You are not going to get much water out of one on a hot dry day in
Las Vegas. But there are deserts where the typical humidity is high,
it just doesn't rain.
Keith
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