.Buildings.Fluid.FixedResistances.BuriedPipes.BaseClasses.groundCouplingFactors

Information

This function computes the multiple buried pipe system coupling matrix P described by Kusuda (1981).

For a network of n buried pipes that are coaxial, the matrix P of size n x n is computed from the system geometry:

where:
a_i = horizontal position of pipe i
d_i = depth of pipe i
r_i = external radius of pipe i

References

Kusuda, T. (1981). Heat transfer analysis of underground heat and chilled-water distribution systems. National Bureau of Standards.

Interface

function groundCouplingFactors
  extends Modelica.Icons.Function;
  input Integer nPip(min = 1, fixed = true) "Number of pipes";
  input Modelica.Units.SI.Length dep[nPip] "Pipes Buried Depth";
  input Modelica.Units.SI.Length pos[nPip] "Pipes Horizontal Coordinate (to an arbitrary reference point)";
  input Modelica.Units.SI.Length rad[nPip] "Pipes external radius";
  output Real P[nPip, nPip] "Thermal coupling geometric factors";
end groundCouplingFactors;

Revisions

• March 17, 2021, by Baptiste Ravache:
  First implementation.