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Tube Pressure Drop
Correction Factors
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Pex-Aluminum-Pex
3/8" ID - multiply pressure drop by 1.3
1/2" ID - multiply pressure drop by 1.1
5/8" ID - multiply pressure drop by 0.7
3/4" ID - multiply pressure drop by 0.5

Copper
3/8" ID - multiply pressure drop by 0.5
1/2" ID - multiply pressure drop by 0.8
5/8" ID - multiply pressure drop by 0.8
3/4" ID - multiply pressure drop by 0.7

Reinforced Rubber
3/8" ID - no correction needed
1/2" ID - no correction needed
5/8" ID - no correction needed
3/4" ID - no correction needed

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


 

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

[The WORKSHEET performs the following calculations automatically]

12. Number of Circuits
To find the Number of Tube Circuits, simply divide the Total Tube Required by the Preliminary Circuit Length found in step 11 and round up to the next whole number.

circuit qty

example: 412' Tube Required / 300' Preliminary = (1.37) > 2 Tube Circuits

13. Actual Circuit Length
To find the Actual Circuit Length, divide the Total Tube Required by the Number of Tube Circuits.

circuit length

example: 412' Tube Required / 2 Tube Circuits = 206' Actual Circuit Lengths

 

 

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