.ThermoPower.Water.PressDrop

Information

The pressure drop across the inlet and outlet connectors is computed according to a turbulent friction model, i.e. is proportional to the squared velocity of the fluid. The friction coefficient can be specified directly, or by giving an operating point, or as a multiple of the kinetic pressure. In the latter two cases, the correction coefficient Kfc can be used to modify the friction coefficient, e.g. to fit some experimental operating point.

A small linear pressure drop is added to avoid numerical singularities at low or zero flowrate. The wnom parameter must be always specified; the additional linear pressure drop is such that it is equal to the turbulent pressure drop when the flowrate is equal to wnf*wnom (the default value is 1% of the nominal flowrate).

Modelling options

The following options are available to specify the friction coefficient:

• FFtype = 0: the hydraulic friction coefficient Kf is set directly.
• FFtype = 1: the hydraulic friction coefficient is specified by the nominal operating point (wnom,dpnom, rhonom).
• FFtype = 2: the pressure drop is K times the kinetic pressure.

Contents

Name	Description
Medium	Medium model
squareReg

Revisions

• 16 Dec 2004 by Francesco Casella:
  Standard medium definition added.
• 18 Nov 2004 by Francesco Casella:
  Kfnom removed, Kf can now be set directly.
• 18 Jun 2004 by Francesco Casella:
  Adapted to Modelica.Media.
• 1 Oct 2003 by Francesco Casella:
  First release.