Big Green: White roof water temp runoff?

[Tim Pope]

Re: Big Green: White roof water temp runoff?I am sure that the City of Phoenix should have some information on heating and roof top colors.  It is reasonable to assume that only the first bit of water will be at roof temperature and will then tend to cool the roof as time goes on.  The "hot" water will probably be collected into a tank with existing water within which should also buffer the storage temperature

Tim Pope, President
American Rainfall Catchment Association
President, Northwest Water Source
Friday Harbor, WA
water at interisland.net. 
  ----- Original Message ----- 
  From: Heather Walters 
  To: John E. Beeson ; Barrie Moore 
  Cc: biggreen at lists.biggreen.org 
  Sent: Thursday, May 22, 2008 6:37 AM
  Subject: RE: Big Green: White roof water temp runoff?


  Maybe I'm missing something, but if it is raining (to feed the cistern) the roof will not be at its maximum temperature and the plants will not require irrigation for a while.

   

  So the water should not be used for a while and would have a chance to cool off even if it was hot.  

   

  I would imagine the cistern design would be more important.  Could you put a temp sensor in the cistern and not irrigate when the temperature is more than X degrees, that may force night time irrigation which is better for plant health and water use (less evaporation) anyway.

   

   

  Heather Walters , LEED AP
  Doty and Miller Architects 



   

   

  From: biggreen-bounces at lists.biggreen.org [mailto:biggreen-bounces at lists.biggreen.org] On Behalf Of John E. Beeson
  Sent: Thursday, May 22, 2008 9:04 AM
  To: Barrie Moore
  Cc: biggreen at lists.biggreen.org
  Subject: RE: Big Green: White roof water temp runoff?

   

  My hands are tied.  I'm thankful to at least get the white roof and to get the water from the roof to feed a cistern for irrigation.  But now, I have to make sure the water temperature isn't dangerous to plants during the summer.

  QUINN EVANS | ARCHITECTS 
  John E. Beeson, LEED AP 
  d 734 926 0425


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  From: Barrie Moore [mailto:merlon at gn.apc.org] 

    Why are you interested in temperature and not kiloWatts ?  Why have you got a white roof ? Why is the water not in a pipe ?

     



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