.ThermalSeparation.Wall.BaseWall

Information

This is the partial model of the column wall. The heat resistance in the column wall is neglected. The heat resistance between column wall and liquid phase and between column wall and ambiance is taken into account. If there exist an insulation, the heat resistance through the insulation is also taken into account. There exists the possiblity to neglect the heat capacitance of the wall, in this case the boolean parameter stat must be set to true. The initial temperature of the wall is supposed to be equal to the initial temperature of the liquid in the column. The insulation is always calculated steady-state, since it is supposed that the heat capacitance of the insulation is always much smaller than the heat capacitance of the column wall.

The heat resistance at the column inner wall can only be taken into account using a constant value for the heat transfer coefficient alpha.

The extending class has to supply an equation for the heat flow rate between insulation (or column wall, if the column has no insulation at all) and ambiance. In the class Adiabatic it is assumed that this heat flow rate is zero. ConstAlpha assumes a constant heat transfer coeffient to calculate the heat flow rate and NaturalConvection calculates the heat transfer coefficent using correlations for natural convection. Qdot assumes a constant flow rate to ambiance.

Technische Universität Hamburg-Harburg

Institut für Thermofluiddynamik, Technische Thermodynamik

Denickestraße 17

D-21073 Hamburg

Germany

www.tu-harburg.de/tt

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Revisions

Documentation last revised: 20.7.2011