> -----Original Message----- > From: brin-l-boun...@mccmedia.com [mailto:brin-l-boun...@mccmedia.com] On > Behalf Of hkhenson > Sent: Monday, July 13, 2009 12:29 PM > To: brin-l@mccmedia.com > Subject: Re: Drinking Water From Air Humidity > > 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?ha > sh=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
OK, would you agree that this is kinda a best case scenario? I've used dehumidifiers in damp basements, and the relative humidity was quite high 80+%. You're right about different deserts, I happened to pick Las Vegas because I've benchmarked the local NWS office, and Las Vegas temps for the last few days is just a few clicks from that bookmark. But, the UAE, for example, would be better off....but not as good as the basement. I also have numbers for the Perth desalinization plant, which quotes 3.2 kwH per 1000 liters. I have the website for them on another computer, but will bring it over if folks have trouble finding it. Now, this could be propaganda, but I have a hard time believing that they could lie about factors of >100 and get away with it. So, it looks like desalinization is much less energy intensive when salt water is available. That's probably why places like the UAE are looking at desalinization instead of condensers. Dan M. _______________________________________________ http://mccmedia.com/mailman/listinfo/brin-l_mccmedia.com
