XPost: alt.tv.hometime, alt.building.construction, alt.tv.home-imprvment 
 XPost: alt.home.automation 
 From: philscott@philscott.net 
  
 "Chas Hurst"  wrote in message 
 news:0uednRz508PCbCLfRVn-1w@comcast.com... 
 > Don't cooling towers use evaporative cooling? 
  
  
 Yes they do... but they discharge 100% relative humidity 
 air...but its outside so its fine...the water in the process 
 is cooled and that cool water is used to cool most often the 
 condensers on large tonnage refrigerated AC systems.  that 
 water typically runs 65 to 80 degrees F... sufficiently cool 
 to cool condensers but not cool enough to be used directly for 
 conditioning air  (below 40F is required) 
  
 Phil Scott 
 > 
 > "Phil Scott"  wrote in message 
 > news:d9ocdq$2hf$1@news.tdl.com... 
 > > 
 > > "Some Guy"  wrote in message 
 > > news:42BF3E57.659FD057@Guy.com... 
 > > > Phil Scott wrote: 
 > > > 
 > > > > > Doesn't a mister waste water by atomizing it and 
 then 
 > > the 
 > > > > > wind will blow it away? 
 > > > > 
 > > > >      The latent heat of evaporation for water ... 
 > > > 
 > > > I still don't see an effective way to arrange a 
 residential 
 > > cooling 
 > > > system based on the evaporation of water. 
 > > > 
 > > > I don't think you can concentrate and deliver a 
 substantial 
 > > amount of 
 > > > heat to a surface you can cool via evaporation. 
 Evaporative 
 > > cooling 
 > > > would be effective if the heat inside a house could be 
 > > brought to an 
 > > > out-door device who's surface temperature is well above 
 > > boiling and 
 > > > the application of water would result in evaporative 
 > > cooling. 
 > > > 
 > > > > Evaporative cooling would be limitlessly popular if it 
 > > > > did not add an equal amount of humidity in the form of 
 > > > > 'steam' to the air it was cooling to *sensibly lower 
 > > > > termperatures. 
 > > > 
 > > > So what you're saying is to mistify the air circulating 
 in a 
 > > house in 
 > > > order to cool it.  I don't think that would work once 
 you've 
 > > saturated 
 > > > the air (ie humidity > 75%) not to mention the effects 
 of 
 > > saturated 
 > > > air on items in the house, the wood, the machinery, etc. 
 > > 
 > > I am a mechancal engineer doing these sorts of 
 calculations 
 > > and systems for over 40 years.. and you are entirely 
 correct 
 > > if the humidity is say 50% and the outside air is 90F... 
 you 
 > > can cool the air to 75 or so but the humidity is then up 
 into 
 > > the 80% range and all the problems you mention manifest. 
 > > Thats why evaportive cooling is not used in many cases. 
 > > 
 > > However in areas where the relative humidity is in the 20 
 to 
 > > 30% range, and the outside air is over 90F... then the 
 supply 
 > > air can be cooled to 70F and 50% relative humidity..that 
 works 
 > > very well/ 
 > > 
 > > 
 > > > 
 > > > I think only the roof makes a workable item to cool with 
 a 
 > > water 
 > > > cooling.  It's designed to get wet, to collect runoff, 
 and 
 > > gets very 
 > > > hot in the summer, and cooling it can lead to reduction 
 in 
 > > cooling 
 > > > requirements of the house. 
 > > 
 > >      Its workable...but there are problems ..its seldom 
 used 
 > > because of those problems.   You get to do whatever you 
 wish 
 > > though its yer house.  Have fun. 
 > > 
 > > 
 > > > 
 > > > The only thing that makes more sense is a temporary tarp 
 or 
 > > canopy to 
 > > > cover the roof during the summer (to be taken down 
 during 
 > > nasty 
 > > > weather, storms, etc). 
 > > 
 > >   Oh please. 
 > > 
 > > 
 > > Phil Scott 
 > > 
 > > 
 > 
 > 
  
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