Radiant Cooling (and Heating) Calculators (cont’d)
Find The Best Temperature Offset For Maximum Capacity
The Surface Temp Tab:
This is a handy way to estimate the surface temperature when you
know the water temperature, and the R-value of what is between
the water (PEX tube) and the radiant surface, and the air
temperature of the room.
For “radiant temp” input a water temperature. You can play with
some worst case scenarios, maybe from 45-65F. For air temp, you
can also play with some worst case scenarios, maybe 70-90F.
For entering an R-value, this is where things get tricky. So in the
thermal sandwich there may be multiple different types of
materials. And many materials do not have a published R-value. But
don’t worry, there is a solution on the next page.
Once you have the R values (see next page for info on K to R
conversion) along with the water temp and the air temp, you will be
able to calculate the estimated surface temperature.
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