INDEX

Copyrights

Getting Started
Heat Load
.....heat loss basics
Floor Output
Floor Covering
Floor Surface Temp.
Average Water Temp.
Supply Water Temp.
Tube Selection and Size
Tube Spacing
Total Tube Required
Tube Circuit Length
Number of Circuits
Actual Circuit Length
Flow Per Tube
Pressure Drop
Summarize Circuits

System Flow
System Pressure Drop

USE THE RadPad© 'WORKSHEET' to complete the system sizing.

The WORKSHEET (above) will open in a seperate window.

3. Floor Output
The RadPad© Worksheet (above) will do this calculation for you.

Divide the Room Heat Loss by the Heated Floor Area which will contribute to heating the space.
Discount floor area under fixed cabinets.
The result will be in btus per square foot per hour.

example: 1,846 btu/hr divided by 120 sq ft = 15 btu/hr/sq ft

4. Floor Covering

Select the R-Value of the floor covering to be used.
If carpet and pad are to be used, add the two R-Values together.

Floor Structure R-Value + Carpet R-Value + Pad R-Value = Total R-Value

IMPORTANT: You must also add the Equivalent R-Value of the floor itself. This accounts for the resistance between the tube and fhe floor surface.

example: tubing stapled to the top of a plywood subfloor and embedded in 2" of gypsum cement.

1/2" Acrylic plush carpet = 1/4" Foam rubber pad = gypsum subfloor system = Total Floor =	R-Value 1.71 R-Value 0.50 R-Value 1.00 R-Value 3.21 (the Worksheet will do this math)

NOTE: If, after going through the system sizing procedure you find excessive water temperatures, return to this step and substitute floor coverings with lower R-Values. Floor coverings can significantly impact floor outputs.

(Tip: use 1/4" foam rubber carpet pads)