.AixLib.Fluid.Storage.TwoPhaseSeparator

Information

This is a model of a ideally working two-phase separator. The separator separates a vapor mixture into its liquid and vapour parts until the tank is either empty or full.

Assumptions

Several assumptions are made and presented below:

• Dynamic mass and energy balances.
• Thermodynamic equilibrium at all times.
• Upright position of the separator with circular cross-sectional area.
• Inlet at the top.
• Outlet at the bottom.
• Heat losses can be computed optionally. However, time independent heat transfer coefficients are assumed that must be given a priori.

Moreover, the thermodynamic model is generally based on the tank model presented by Quoilin et al. (2014) in their ThermoCycle library.

Calculation of specific enthalpies

The specific enthalpies at the tank's inlet and outlet depend on the relative tank level. The calculation procedures are presented below:

Implementation

If the two-phase separator is connected with respect to design direction, it will behave like a liquid receiver. If the two-phase separator is connected aggainst design direction or flow reversal occurs, it will behave like a mist eliminator.

References

Quoilin, Sylvain; Desideri, Adriano; Wronski, Jorrit; Bell, Ian and Lemort, Vincent (2014): ThermoCycle: A Modelica library for the simulation of thermodynamic systems. In: Proceedings of the 10th International Modelica Conference; March 10-15; 2014; Lund; Sweden. Linköping University Electronic Press, S. 683–692.

Contents

Revisions

• October 18, 2017, by Mirko Engelpracht, Christian Vering:
  First implementation (see issue 457).