Calculator for Microflex Heating Pipes

Part number selection

It’s important to make the appropriate choice of Microflex inner pipe, based on the required heat load. Follow the guidelines to select the pipes for your heating connection/network:

  1. Enter project name.
  2. Name your connection (for example: Boiler room – House 1).
  3. Fill in the temperatures of flow and return. Ground temperature is preset on 10°C, but can be changed.
  4. Fill in the required heat load, and press ‘enter’. The overview table shows the result of all possible diameters with the following data
    • Flow speed in carrier pipe [m/s] (Recommended value is 1m/s)
    • Approximate flow [l/s]
    • Pressure loss [Pa/m]
  5. Select the appropriate medium pipe.
  6. Select UNO or DUO (one or two pipes in same outer jacket).
  7. Select the diameter of the outer casing. The appropriate part number based on the chosen parameters appear.
  8. Fill in the required single length.

To add a line, click .
To delete a line, click on the trash bin .
If you have multiple runs, the total pressure loss for the entire network appears below.

Project1 
Flow temperature less than or equal to return temperature.
Please fill up all required fields!
Enter project name.
Name your connection (for example: Boiler room – House 1).
Fill in the temperatures of flow and return. Ground temperature is preset on 10°C, but can be changed.
Fill in the required heat load, and press ‘enter’. The overview table shows the result of all possible diameters with the following data
  • Flow speed in carrier pipe [m/s] (Recommended value is 1m/s)
  • Approximate flow [l/s]
  • Pressure loss [Pa/m]
Select the appropriate medium pipe.
Select UNO or DUO (one or two pipes in same outer jacket).
Select the diameter of the outer casing. The appropriate part number based on the chosen parameters appear.
Fill in the required single length.
Connection 2 Temperatures [°C] 3 Heat Load
[kW] 4
Mediumpipe d_out [mm] × s 5 UNO / DUO 6 Outer casing
[mm] 7
Part number Length
[m] 8
Flow Return Ground













Pipe size Dout × s [mm]

Flow speed in carrier pipe [m/s] Approx. P-value [kW] Approx. Flow [l/s] Pressure loss [P/m]

25x2.3

32x2.9

40x3.7

50x4.6

63x5.8

75x6.8

90x8.2

110x10

125x11.4

Pressure and heat losses

The pressure and heat loss are shown in the following layout:

Connection Temperatures [°C] Heat Load
[kW]
Microflex type Total
length
[m]
Flow
speed
[m/s]
Pressure losses Heat losses
Flow Return Ground Medium pipe
d_out [mm] × s
UNO /
DUO
Outer casing
[mm]
Part number [Pa/m] [Pa] [bar] [W/m] kW °C
































Pipe length UNO [m] Total pressure loss [bar] Total heat loss
Pipe length DUO [m]
Total pipe length [m]
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