.BuildingSystems.Fluid.FixedResistances.BaseClasses.PlugFlow

Information

Model that computes the temperature propagation of a fluid flow through a pipe, idealized as a plug flow.

Main equation

The transport delay is computed using the one-dimensional wave equation without source or sink terms,

∂z(x,t)/∂t + v(t) ∂z(x,t)/∂x = 0,

where z(x,t) is the spatial distribution as a function of time of any property z of the fluid. For the temperature propagation, z will be replaced by T.

Assumptions

This model is based on the following assumptions:

• Axial diffusion in water is assumed to be negligibe.
• The water temperature is assumed uniform in a cross section.

Revisions

• October 20, 2017, by Michael Wetter:
  Deleted various parameters and variables that were not used.
  Revised documentation to follow the guidelines.
• May 19, 2016 by Marcus Fuchs:
  Remove condition on show_V_flow for calculation of V_flow to conform with pedantic checking.
• October 10, 2015 by Marcus Fuchs:
  Copy Icon from KUL implementation and rename model.
• June 23, 2015 by Marcus Fuchs:
  First implementation.