functiongroundCouplingFactors

Geometric factors for buried pipe-ground coupling

Extends from Modelica.Icons.Function (Icon for functions).

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

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

Type	Name	Description
Integer	nPip	Number of pipes
Modelica.Units.SI.Length[nPip]	dep	Pipes Buried Depth
Modelica.Units.SI.Length[nPip]	pos	Pipes Horizontal Coordinate (to an arbitrary reference point)
Modelica.Units.SI.Length[nPip]	rad	Pipes external radius

Type	Name	Default	Description
Real[nPip,nPip]	P		Thermal coupling geometric factors