View Single Post
  #17   Report Post  
Posted to alt.home.repair
Berkshire Bill Berkshire Bill is offline
external usenet poster
 
Posts: 68
Default Finally finished my replacement of the galvanized pipes


wrote in message
...
Deke wrote:

wrote:

I would support it more often then every 32 inches, but that's just me.

I am also curious about the double insulation??


Very simple really,

Use the 4 ft foam insulation sticks from home depot. Then wrap
that with 3 1/2 " fiberglass wall insulation in a spiral, and finally
wrap clear plastic (loosely so as not to over compress the fiberglass)
around that to hold it all together.

Water sitting in the pipe stays hot/warm for hours after a shower.


It's a miracle! If 1" of US R5 insulation + 3.5" of R11 insulation has
a R16x12/4.5 = 42.6 ft^2-h-F/Btu thermal resistance, ie k = 1/42.6
= 0.0234 and 1' of 1/2" pipe has R = ln(4.5/0.5)/(2Pik) = 14.9 h-F/Btu
and C = Pi(0.5/24)^2x62.33 = 0.085 Btu/F and RC = 1.27 hours, 120 F
pipe water would cool to 70+(120-70)e^(-3/1.27) = 74.7 in a 70 F room.

Nick


At least your toughts are readable !

Bill