Re: [Phys-l] cooling hints

[Roger Haar <haar@physics.arizona.edu>]

	In AZ, during the early, dry  part of the summer, the 
overnight temps dip into the low 70's or even the 60's.  By 
early July the humidity rises and overnight lows are low 
80's or high 70's.  At this point fan and swamp coolers fail 
to help much.

	I remember one ugly morning when it was 89 F at sunrise 
with moderately high humidity.

	Before I replaced the A/C I had A/C and a swamp cooler. 
The new A/C was almost as cheap to run as the swamp cooler. 
  Cooler fans and pumps run 24/7, and they use a lot of 
water.  Ours scaled up badly and required a fair amount of 
maintenance.

Thanks
  Roger Haar  U of AZ

=============================================================
On 8/24/2011 10:39 AM, Bernard Cleyet wrote:
> On 2011, Aug 24, , at 08:28, Roger Haar wrote:
>
> > 	Here at the U of Arizona, they take this a step further.
> > At night, when the outside temp has dropped and the electric
> > rate is lower, they make ice, lots of ice.  The campus is
> > cooled during the day with this ice.  They claim to save
> > lots of money.
>
>
> Question:  Does the temp. drop sufficiently so that initial cooling may be obtained by blowing in outside air (filtered of course).
>
> Here in very comfy Salinas, I have fans that blow air in during the night and open the shades of our skylights.  This cools the inside from a max of typically 25 C (second floor)  to 18 C.  (downstairs 22 and 16).
>
>
> Also are not "swamp" (evaporative) coolers efficient in the Great American Desert?   I couldn't stand the temperature in my cousin's house (Near Weber State U. Utah) one Summer while visiting with their fan motor out.  I bought a new one installed it.  What a difference!  They hadn't bothered because accustomed to that climate.
>
> bc
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