Greetings,
Sorry for the confusion. The originator used a public water supply, I
don't. I use well water. My well tank sits in a tin building, and the
water comes out of the ground around 80F. A piece of galvalume sitting
in the bright sun can reach temperatures in excess of 150F very quickly.
So, even water that is considered warm by human skin standards, can
still cool a roof very well.
Bright Blessings,
Kim
ElfNori wrote:
> Kim has stated the water is coming from the public water source, which
> means the water lines are under ground and are the mean ground
> temperature which, unless you're in a geothermal zone, will be
> significantly cooler than summertime air temps. In Texas, near Houston,
> the average ground temperature should be somewhere between 54° and 64°,
> so the water is going to be between 25 and 40° cooler than the air
> temperature in the height of summer.
>
> ElfN
>
>
> ----- Original Message -----
> *From:* Pat <mailto:trax78245@yahoo.com>
> *To:* papercreters@yahoogroups.com
> <mailto:papercreters@yahoogroups.com>
> *Sent:* Sunday, September 02, 2007 1:24 PM
> *Subject:* RE: [papercreters] Cool Roof - was - containers -was- Re:
> ugly eco home
>
> Hey Kim,
>
> You said "Put a piece of hot metal in water, it cools". That's true
> if the water is cool. If you put cool metal in hot water, the metal
> heats. Seems to me that the water on the roof would work only if
> you keep the water cooler than the temperature of the metal on the
> roof. You'd still get some cooling from evaporation of the water
> but I don't think it'd be enough to be noticeable. I am interested
> in the cool roof technique because I was thinking of putting the
> water storage tanks (from a rain catchment system) underneath the
> house where it stays fairly cool in the summer and they'd be out of
> the way there as well.
>
> Would the cool roof pictures and technical descriptions be on the
> Yahoo **/Group/*/*/ "HREG" home page? I couldn't find the pictures,
> etc on the HREG Yahoo Group home page but maybe you have to be a
> member? I'm really interested in the cool roof since I already have
> a metal roof….I'm supposing I'll need to install gutters and a tank
> to catch the run-off and then distribute it to the garden/flower
> beds/etc. but I've been wanting to build the rainwater catchment
> anyway… if I caught enough rainwater I wouldn't need to use as much
> city water, which would be a good thing! San Antonio isn't
> **quite** as humid as the Houston area but close so if it works in
> Houston it should work here.
>
> Your sprinklers run for 12 minutes/day total….how cool do you keep
> your house? And how dry is it? Do you notice that your towels and
> sheets stay damp? These aren't challenging questions… they're
> something I'd really like to know before I invest time & money in a
> system I don't know if I can live with or not. I really can't
> **stand** for my sheets to be damp. That's the biggest problem I
> have with leaving the windows open at night in the spring when it's
> cool….it's usually also damp and it gets everything in the house
> damp. EEEEyyyech!!! J
>
> Thanks!
>
> Pat
>
> .
>
>
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