XPost: alt.tv.hometime, alt.building.construction, alt.tv.home-imprvment 
 XPost: alt.home.automation 
 From: hurst1@comcast.not 
  
 "Phil Scott"  wrote in message 
 news:d9quua$l83$1@news.tdl.com... 
 > 
 > "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 
  
 Well you really lost me now. Hasn't this suggestion of water ON the roof 
 been about water on the outside of the house? 
 So the humidity created by a watered roof would be outside, just as with a 
 cooling tower. 
  
 Chas Hurst 
  
  
  
 > > "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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