XPost: alt.tv.hometime, alt.building.construction, alt.tv.home-imprvment 
 XPost: alt.home.automation 
 From: hurst1@comcast.not 
  
 Don't cooling towers use evaporative cooling? 
  
 "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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