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Heat Loss Express
2. In the Floor Profile pane, enter the proper values as follows:
a. If you know the Floor Cover R-Value, enter it in the box; otherwise, click the down-arrow and
select an item from the pull-down menu.
b. If a finished wood floor is part of the “floor profile” and you know the Wood Floor R-Value,
enter it in the box; otherwise, click the down-arrow and select an item from the pull-down menu.
c. If you know the Subfloor R-Value, enter it in the box; otherwise, click the down-arrow to display
R-value options. Use your mouse to point to one of the options. You will be presented with
additional options. Repeat until you find the correct R-value and click on it.
d. If the Carpet Pad box is displayed (depending on which item you selected in Floor Cover R-
Value) and you know the R-value, you may enter it; otherwise, click the down-arrow and select an
item from the pull-down menu.
Note: As you enter R-values, the Radiant Supply Temp will be recalculated. Do not allow it to exceed
150
o
F (the value will turn red). To lower its value, you can decrease the Max Floor Temp in the
Heat Loss – Heated Area pane. This may result in a need for supplemental heat.
3. In the Tubing Calculator pane, enter values as follows:
a. In the Distance to Manifold (ft) box, enter the distance from one end of the loop to the manifold.
The system will automatically double the value in its calculations to allow for the return path.
b. Click the down-arrow in the Tube Size box to select a different tube size. The default selection is
½".
c. Enter a value in the Radiant Tube Spacing (in.) box.
d. Enter the number of loops you want to install in the Number of Radiant Loops box.
4. Observe if the Loop Lengths (ft) value is greater than the Max Loop Length (ft) value. It will be
displayed in red. If the value is too high, you can lower it by doing any of the following:
Increase the Tube Size. This will increase the Max Loop Length (ft). •
•
•
Increase the Radiant Tube Spacing (in). This will decrease the Loop Length (ft).
Increase the Number of Radiant Loops. The will decrease the Loop Length (ft) of each loop.
5. Before clicking the OK button, note the following:
20 Slant/Fin Corporation