Details on Dimensioning in Basic Conditions
Information on the section Dimensioning in the Basic conditions dialog of heating pipe network calculation.
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Applies to: Heating, Cooling.
Select if the calculation process is supposed be carried out according to maximum velocity, maximum pipe friction pressure gradient or maximum pipe friction pressure gradient dependent on the nominal diameter. The maximum velocity and the maximum pipe friction pressure gradient may be used at the same time.
If dimensioning is done according to maximum velocity and maximum pipe friction pressure gradient and one of the limit values is exceeded in a pipe section, the program automatically selects the next greater dimension.
If a pipe section has been assigned different limit values for maximum velocity and maximum pipe friction pressure gradient using the function Pipe section data or Editing pipe section data via drawing, these individual limit values have priority over settings specified in the Basic conditions dialog.
Maximum velocity
Enabled: During dimensioning, limit values from the fields Maximum velocity and Maximum velocity in radiator connection pipes is used. The limit value Maximum velocity is valid for all pipe sections except for radiator connection pipes. If the limit value for maximum velocity is exceeded in one pipe section, the next greater dimension is selected by the program.
Disabled: Dimensioning is carried out considering only pipe friction pressure gradients.
Maximum velocity in radiator connection pipes
Enter a separate limit value for maximum velocity in radiator connection pipes. It will be used if the checkbox Maximum velocity is active. If the limit value for maximum velocity is exceeded in a radiator connection pipe, the next greater dimension is selected by the program.
Maximum pipe friction pressure gradient
Enabled: During dimensioning, the provided limit value for maximum pipe friction pressure gradient is used.
Maximum pipe friction pressure gradient dependent on the nom. diameter
Enabled: In the fields from DN and to DN, enter the nominal diameter range, within which the maximum pipe friction pressure gradient is valid.
Global pressure loss for fittings and joining pieces
Enabled: During calculation of pressure loss for fittings and joining pieces, the here provided portion of pressure loss for pipes is used.
Disabled: During calculation of pressure loss for fittings and joining pieces, the zeta values of constructed fittings and joining pieces in the model are used.