Heating Help

BTU of plain copper pipe

Can anyone refer me to a chart with the amount of heat unfinned copper pipe radiates?

Heat loss from copper tubing...

There is a nice graph in John Siegenthaler's book, Modern Hydronic Heating, 2ND Edition, page 242. Figure 8-44. This applies for cases where the length of the tubing (in feet) divided by the flow rate (gallons/minute) is less than 20 ft/gpm. There is a complicated formula for when it is greater than 20.

The graph has the temperature of the water - temperature of the air in degrees F = 0 at the left and 140F at the right. At the left end, the heat loss is zero. At the right is the heat loss at 140F difference. There is a separate curve for each size tubing.

For example, at that end,

Tube size     Heat Loss
2"                 about 150 BTU/hr/ft
1.5"               118
1.25"              102
1"                   85
3/4"                 68
1/2"                 52

The lines are nearly straight.

Burnhams heating helper

page 48     http://www.burnham.com/PDF/htghelper.pdf

Well JD is helping,,,

anyway,, I was "crappy" to him before, and for that I`m sorry,,,, but I think we understand each-other now. ;-)

PS- He gave some pretty valuable stats, (until you found the Burnham site) :-).