Pipe data

Calculation method

 EPG
The contribution of the pipes to the distribution efficiency may be computed with the flat rate or detailed method, which can be specified here. When choosing the flat rate method, only the insulation size for the system is required. If the detailed method is applied the pipes, materials, and insulation size for the system need to be specified.

•      Flat rate

•      Detailed

Pipe insulation

 EPG
The pipe insulation needs to be specified if the calculation method for computing the distribution efficiency is flat rate. The pipe insulation determines the distribution efficiency as indicated in NEN 7120, Section 19.4.3.3.

•      Uninsulated

•      Minimum thickness of 10 mm

•      Minimum thickness of 20 mm

Detailed calculation method

If the calculation method is chosen to be detailed, the above screen appears in which the piping of the circulation system can be specified. Pipes may be added, copied, and deleted using the icons in the screen.

Sufficient data on the insulation of the circulation pipes known

 EPG
With this box it can be indicated whether the data on the insulation of the circulation pipes is known, or whether it should be estimated, see Insulation thickness.

Number

[Pieces] EPG
This number represents the number of identical pipes in the system. The length of the pipes is multiplied with this number and used as such in the calculations.

Length

[M] EPG
This represents the length of the pipe section, expressed in m.

External diameter

 EPG
The external diameter of the pipes should be specified as indicated in NEN 7120, Tables 19.4 and 19.6. The U-value per meter of copper pipe is determined using this external diameter in combination with the insulation thickness.

•      10 mm

•      12 mm

•      15 mm

•      22 mm

•      28 mm

•      35 mm

•      42 mm

•      54 mm

•      67 mm

•      80 mm

Material

 EPG
The pipe material is specified here.

•      Copper

•      PE        Polyethylene

•      PEX      PE with cross-links in the polymer structure

•      PEX-Al PEX with an intermediate layer of aluminium

•      PVC-C

•      PPR     Polypropylene

•      PB        Polybutylene

Insulation Thickness (insufficient known data)

 EPG
When insufficient insulation data is available, the insulation thickness is specified according to NEN 7120, Table 19.6.

•      Uninsulated

•      Minimum thickness of 10 mm

•      Minimum thickness of 20 mm

Insulation Thickness (sufficient known data)

 EPG
When sufficient insulation data is available, the insulation thickness is specified according to NEN 7120, Table 19.4.

•      Uninsulated

•      10 mm

•      15 mm

•      20 mm

•      25 mm