|
|
re: radiant heat
6 dec 1997
mike morrin wrote:
>> there is very little radiant heat from pipes carrying hot water.
>...when it is freezing outside, our boiler is heating water to about
>22 degrees c, and keeping the house at 15 degrees c.
if the floor were 72 f, and the house walls 59 f at most, perhaps the
convective floor heat would be about (72-59)1.5 = 20 btu/h-ft^2, but it
might radiate 0.174x10^-8((72+460)^4-(59+460)^4) = 61 btu/h-ft^2, so
61/81 = 75% of its heat would be radiant...
nick
|
|
