SolCool scam or not? [RE-wrenches]

[Windy Dankoff]

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I've lived with and otherwise observed a variety of PV-powered  
evaporative (swamp) coolers here in the Santa Fe region. They work  
fine whenever the humidity is low, and are only a nuisance when it's  
high, because the only thing they accomplish is to further humidify  
the air. Every promotion I've every seen from respectable evap cooler  
makers states that it is only applicable in dry climates. I received  
a call from SolCool a few years ago. The fellow was straight up about  
it being an evaporative pre-cooler. When I saw that their web site  
made no mention of the fundamental limitation, I lost respect. I'm  
amazed if they are promoting any such thing outside of the arid west.  
Nobody else does.

Windy


> From: "Joel  Davidson" <joeldavidson at earthlink.net>
>
> In the 1980s Wm. Lamb Company made a PV powered swamp cooler that was
> attached in front of the condenser of a conventional air  
> conditioner. The
> cooler uses a 24 VDC Pitman motor direct powered by 2 each Arco 30- 
> watt
> 30-cell modules and also required water plumbed to it. Within 2  
> years, scale
> built up in the cooler and the painted sheet metal body rusted. The
> additional moisture on the air conditioner caused it to rust. The  
> principle
> underlying direct evaporative (adiabatic saturation) cooling is the
> conversion of sensible to latent heat. Nonsaturated (low humidity)  
> air is
> cooled by exposure to free and colder water, both thermally  
> isolated from
> the other influences. Swamp coolers will work in Athens Greece, not  
> Athens
> Georgia.
>
> The Second Edition of Evaporative Air Conditioning Handbook by Dr.  
> John R.
> Watt P.E. copyright 1986 had 450 pages of more than I ever wanted  
> to know
> about the subject.
>
> Do any wrenches or your customers use a swamp cooler?
>
> Joel Davidson

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