Buildings.Experimental.DistrictHeatingCooling.Validation
Package with models for the validation of the bi-directional district heating and cooling system models
Information
This package contains models that validate the district heating and cooling models. The examples plot various outputs, which have been verified against analytical solutions or by inspecting their change due to parametric changes. These model outputs are stored as reference data to allow continuous validation whenever models in the library change.
Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).
Package Content
| Name | Description |
|---|---|
 HeatingCoolingHotWaterSmall
|
Validation model for a system with heating, cooling and hot water |
| IdealSmallSystem
|
Validation model for a small system |
Buildings.Experimental.DistrictHeatingCooling.Validation.HeatingCoolingHotWaterSmall
Validation model for a system with heating, cooling and hot water
Information
This model validates a small ideal bi-directional heating and cooling network. The heating and cooling heat flow rates extracted from the district supply are prescribed by time series.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| HeatFlowRate | Q_flow_nominal | 6E5 | Nominal heat flow rate, positive for heating, negative for cooling [W] |
| Real | R_nominal | 100 | Pressure drop per meter at nominal flow rate [Pa/m] |
| Design parameter | |||
| Temperature | TSetHeaLea | 273.15 + 12 | Set point for leaving fluid temperature warm supply [K] |
| Temperature | TSetCooLea | 273.15 + 16 | Set point for leaving fluid temperature cold supply [K] |
| TemperatureDifference | dT_nominal | TSetCooLea - TSetHeaLea | Temperature difference between warm and cold pipe [K] |
Connectors
| Type | Name | Description |
|---|---|---|
| Bus | weaBus |
Modelica definition
model HeatingCoolingHotWaterSmall
"Validation model for a system with heating, cooling and hot water"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Water "Fluid in the pipes";
parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal = 6E5
"Nominal heat flow rate, positive for heating, negative for cooling";
parameter Modelica.SIunits.Temperature TSetHeaLea = 273.15+12
"Set point for leaving fluid temperature warm supply";
parameter Modelica.SIunits.Temperature TSetCooLea = 273.15+16
"Set point for leaving fluid temperature cold supply";
parameter Modelica.SIunits.TemperatureDifference dT_nominal(
min=0.5,
displayUnit="K") = TSetCooLea-TSetHeaLea
"Temperature difference between warm and cold pipe";
parameter Real R_nominal(unit="Pa/m") = 100
"Pressure drop per meter at nominal flow rate";
final parameter Modelica.SIunits.MassFlowRate m_flow_nominal = Q_flow_nominal/4200/dT_nominal
"Nominal mass flow rate";
Plants.HeatingCoolingCarnot_T pla(
redeclare package Medium = Medium,
show_T=true,
m_flow_nominal=m_flow_nominal) "Heating and cooling plant";
Buildings.Fluid.Sources.Boundary_pT pSet(redeclare package Medium = Medium,
nPorts=1) "Model to set the reference pressure";
Buildings.Fluid.FixedResistances.Pipe pip(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
thicknessIns=0.2,
lambdaIns=0.04,
length=50,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
v_nominal=2,
dp_nominal=50*R_nominal,
useMultipleHeatPorts=true,
nSeg=1);
Buildings.Fluid.FixedResistances.Pipe pip1(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
thicknessIns=0.2,
lambdaIns=0.04,
length=50,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
v_nominal=2,
dp_nominal=50*R_nominal,
useMultipleHeatPorts=true,
nSeg=1);
SubStations.VaporCompression.HeatingCoolingHotwaterTimeSeries_dT larOff(
redeclare package Medium = Medium,
filNam=Modelica.Utilities.Files.loadResource(
"modelica://Buildings/Resources/Data/Experimental/DistrictHeatingCooling/SubStations/VaporCompression/RefBldgLargeOfficeNew2004_7.1_5.0_3C_USA_CA_SAN_FRANCISCO.mos"),
TOut_nominal=273.15) "Large office";
Buildings.BoundaryConditions.WeatherData.ReaderTMY3 weaDat(filNam=
Modelica.Utilities.Files.loadResource("modelica://Buildings/Resources/weatherdata/USA_CA_San.Francisco.Intl.AP.724940_TMY3.mos"),
computeWetBulbTemperature=false) "File reader that reads weather data";
SubStations.VaporCompression.HeatingCoolingHotwaterTimeSeries_dT ret(
redeclare package Medium = Medium,
filNam=Modelica.Utilities.Files.loadResource(
"modelica://Buildings/Resources/Data/Experimental/DistrictHeatingCooling/SubStations/VaporCompression/RefBldgStand-aloneRetailNew2004_7.1_5.0_3C_USA_CA_SAN_FRANCISCO.mos"),
TOut_nominal=273.15) "Retail";
Plants.LakeWaterHeatExchanger_T bayWatHex(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
dpHex_nominal=10000)
"Bay water heat exchanger";
BoundaryConditions.WeatherData.Bus weaBus;
Buildings.Fluid.FixedResistances.Junction splSup(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal*{1,1,1},
dp_nominal=40*R_nominal*{0,1,1},
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
tau=5*60,
from_dp=false) "Flow splitter";
Buildings.Fluid.FixedResistances.Junction splRet(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal*{1,1,1},
dp_nominal=40*R_nominal*{0,1,1},
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
tau=5*60,
from_dp=false) "Flow splitter";
Modelica.Blocks.Sources.CombiTimeTable watTem(
tableOnFile=true,
tableName="tab1",
extrapolation=Modelica.Blocks.Types.Extrapolation.Periodic,
smoothness=Modelica.Blocks.Types.Smoothness.ContinuousDerivative,
y(each unit="K"),
fileName=Modelica.Utilities.Files.loadResource(
"modelica://Buildings/Resources/Data/Experimental/DistrictHeatingCooling/Plants/AlamedaOceanT.mos"))
"Temperature of the water reservoir (such as a river, lake or ocean)";
protected
Modelica.Blocks.Sources.Constant TSetC(k=TSetCooLea)
"Set point temperature for leaving water";
Modelica.Blocks.Sources.Constant TSetH(k=TSetHeaLea)
"Set point temperature for leaving water";
equation
connect(pip.port_b, splSup.port_1);
connect(splSup.port_3, larOff.port_a);
connect(splSup.port_2, ret.port_a);
connect(larOff.port_b, splRet.port_3);
connect(pip1.port_a, splRet.port_1);
connect(splRet.port_2, ret.port_b);
connect(TSetH.y, pla.TSetHea);
connect(TSetC.y, pla.TSetCoo);
connect(pip.port_a, bayWatHex.port_b1);
connect(bayWatHex.port_a1, pla.port_b);
connect(bayWatHex.port_b2, pla.port_a);
connect(bayWatHex.port_a2, pip1.port_b);
connect(bayWatHex.TSetHea, TSetH.y);
connect(pSet.ports[1], pla.port_a);
connect(weaDat.weaBus, weaBus);
connect(pla.TSink, weaBus.TDryBul);
connect(weaBus, larOff.weaBus);
connect(weaBus, ret.weaBus);
connect(bayWatHex.TSouWat, watTem.y[1]);
connect(bayWatHex.TSouHea, weaBus.TDryBul);
connect(bayWatHex.TSetCoo, TSetC.y);
connect(bayWatHex.TSouCoo, weaBus.TDryBul);
end HeatingCoolingHotWaterSmall;
Buildings.Experimental.DistrictHeatingCooling.Validation.IdealSmallSystem
Validation model for a small system
Information
This model validates a small ideal bi-directional heating and cooling network. The heating and cooling heat flow rates extracted from the district supply are prescribed by time series.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| HeatFlowRate | Q_flow_nominal | 0.5E6 | Nominal heat flow rate, positive for heating, negative for cooling [W] |
| Real | R_nominal | 100 | Pressure drop per meter at nominal flow rate [Pa/m] |
| Design parameter | |||
| Temperature | TSetHeaLea | 273.15 + 8 | Set point for leaving fluid temperature warm supply [K] |
| Temperature | TSetCooLea | 273.15 + 14 | Set point for leaving fluid temperature cold supply [K] |
| TemperatureDifference | dT_nominal | TSetCooLea - TSetHeaLea | Temperature difference between warm and cold pipe [K] |
Modelica definition
model IdealSmallSystem "Validation model for a small system"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Water "Fluid in the pipes";
parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal = 0.5E6
"Nominal heat flow rate, positive for heating, negative for cooling";
parameter Modelica.SIunits.Temperature TSetHeaLea = 273.15+8
"Set point for leaving fluid temperature warm supply";
parameter Modelica.SIunits.Temperature TSetCooLea = 273.15+14
"Set point for leaving fluid temperature cold supply";
parameter Modelica.SIunits.TemperatureDifference dT_nominal(
min=0.5,
displayUnit="K") = TSetCooLea-TSetHeaLea
"Temperature difference between warm and cold pipe";
final parameter Modelica.SIunits.MassFlowRate m_flow_nominal = Q_flow_nominal/4200/dT_nominal
"Nominal mass flow rate";
parameter Real R_nominal(unit="Pa/m") = 100
"Pressure drop per meter at nominal flow rate";
Plants.Ideal_T pla(
redeclare package Medium = Medium,
show_T=true,
m_flow_nominal=m_flow_nominal) "Heating and cooling plant";
Buildings.Fluid.Sources.Boundary_pT pSet(
redeclare package Medium = Medium,
nPorts=1) "Model to set the reference pressure";
SubStations.Heating hea1(redeclare package Medium = Medium, Q_flow_nominal=200E3)
"Heating load";
SubStations.Heating hea2(redeclare package Medium = Medium, Q_flow_nominal=100E3)
"Heating load";
SubStations.Cooling coo1(redeclare package Medium = Medium, Q_flow_nominal=-150E3)
"Cooling load";
SubStations.Cooling coo2(redeclare package Medium = Medium, Q_flow_nominal=-100E3)
"Cooling load";
Buildings.Fluid.FixedResistances.Pipe pip(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
nSeg=3,
thicknessIns=0.2,
lambdaIns=0.04,
length=50,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial);
Buildings.Fluid.FixedResistances.Pipe pip1(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
nSeg=3,
thicknessIns=0.2,
lambdaIns=0.04,
length=50,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial);
Modelica.Blocks.Sources.CombiTimeTable
QHea1(table=[0,200E3; 6,200E3; 6,50E3;
18,50E3; 18,75E3; 24,75E3], timeScale=3600, extrapolation=Modelica.Blocks.Types.Extrapolation.Periodic)
"Heating demand";
Modelica.Blocks.Sources.CombiTimeTable
QHea2(table=[0,100E3; 6,100E3; 6,50E3;
18,50E3; 18,75E3; 24,75E3], timeScale=3600, extrapolation=Modelica.Blocks.Types.Extrapolation.Periodic)
"Heating demand";
Modelica.Blocks.Sources.CombiTimeTable
QCoo1(table=[0,-100E3; 6,-80E3; 6,
-50E3; 12,-20E3; 18,-150E3; 24,-100E3], timeScale=3600, extrapolation=
Modelica.Blocks.Types.Extrapolation.Periodic) "Cooling demand";
Modelica.Blocks.Sources.CombiTimeTable
QCoo2(table=[0,-10E3; 9,-100E3; 9,
-50E3; 18,-50E3; 18,-150E3; 24,-100E3], timeScale=3600, extrapolation=
Modelica.Blocks.Types.Extrapolation.Periodic) "Cooling demand";
Buildings.Fluid.FixedResistances.Junction spl(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal*{1,1,1},
dp_nominal=40*R_nominal*{0,1,1},
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
tau=5*60,
from_dp=false);
Buildings.Fluid.FixedResistances.Junction spl1(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal*{1,1,1},
dp_nominal=40*R_nominal*{0,1,1},
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
tau=5*60,
from_dp=false);
Buildings.Fluid.FixedResistances.Junction spl2(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal*{1,1,1},
dp_nominal=40*R_nominal*{0,1,1},
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
tau=5*60,
from_dp=false);
Buildings.Fluid.FixedResistances.Junction spl3(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal*{1,1,1},
dp_nominal=40*R_nominal*{0,1,1},
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
tau=5*60,
from_dp=false);
Buildings.Fluid.FixedResistances.Junction spl4(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal*{1,1,1},
dp_nominal=40*R_nominal*{0,1,1},
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
tau=5*60,
from_dp=false);
Buildings.Fluid.FixedResistances.Junction spl5(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal*{1,1,1},
dp_nominal=40*R_nominal*{0,1,1},
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
tau=5*60,
from_dp=false);
protected
Modelica.Blocks.Sources.Constant TSetC(k=TSetCooLea)
"Set point temperature for leaving water";
Modelica.Blocks.Sources.Constant TSetH(k=TSetHeaLea)
"Set point temperature for leaving water";
equation
connect(pla.port_b, pip.port_a);
connect(pla.port_a, pip1.port_b);
connect(pSet.ports[1], pip1.port_b);
connect(QHea1.y[1], hea1.Q_flow);
connect(QHea2.y[1], hea2.Q_flow);
connect(QCoo1.y[1], coo1.Q_flow);
connect(QCoo2.y[1], coo2.Q_flow);
connect(pip.port_b, spl.port_1);
connect(spl.port_2, spl1.port_1);
connect(spl1.port_2, spl2.port_1);
connect(spl.port_3, hea1.port_a);
connect(spl1.port_3, hea2.port_a);
connect(spl2.port_2, coo2.port_b);
connect(coo1.port_b, spl2.port_3);
connect(pip1.port_a, spl3.port_1);
connect(spl3.port_3, hea1.port_b);
connect(hea2.port_b, spl4.port_3);
connect(spl4.port_1, spl3.port_2);
connect(spl4.port_2, spl5.port_1);
connect(spl5.port_3, coo1.port_a);
connect(spl5.port_2, coo2.port_a);
connect(TSetH.y, pla.TSetHea);
connect(TSetC.y, pla.TSetCoo);
end IdealSmallSystem;