Buildings.Fluid.HeatExchangers.Boreholes.Examples

Information

Package Content

Name	Description
UTube	Model that tests the borehole model

Buildings.Fluid.HeatExchangers.Boreholes.Examples.UTube

Information

This example models a borehole heat exchanger with two pipes that are symmetrically spaced. The simulation period is 5 years. From the 4th to the 10th months, the mass flow source switches on the flow rate through the borehole. The leaving water of the mass flow source is 25°C, and the water that returns from the borehole is between 20.5°C and 21.5°C.

Modelica definition

model UTube "Model that tests the borehole model"
  extends Modelica.Icons.Example;
 package Medium = Buildings.Media.ConstantPropertyLiquidWater;
  Buildings.Fluid.HeatExchangers.Boreholes.UTube borHol(
    redeclare each package Medium = Medium,
    hBor=150,
    dp_nominal=10000,
    dT_dz=0.0015,
    samplePeriod=604800,
    m_flow_nominal=0.3,
    redeclare each parameter Buildings.HeatTransfer.Data.BoreholeFillings.Bentonite
                                                                                    matFil,
    redeclare parameter Buildings.HeatTransfer.Data.Soil.Sandstone matSoi,
    TExt0_start=283.15,
    TFil0_start=283.15) "Borehole heat exchanger";
      inner Modelica.Fluid.System system;
  Sources.Boundary_ph sin(nPorts=1, redeclare package Medium = Medium) "Sink";
  Sources.MassFlowSource_T sou(
    nPorts=1,
    redeclare package Medium = Medium,
    use_m_flow_in=true,
    T=298.15) "Source";
  Modelica.Blocks.Sources.Pulse pulse(
    amplitude=0.3,
    period=365*86400,
    startTime=365*86400/4);
equation 
  connect(sou.ports[1], borHol.port_a);
  connect(borHol.port_b, sin.ports[1]);
  connect(pulse.y, sou.m_flow_in);
end UTube;