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Ventilation.mo
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Ventilation.mo
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within OU44;
model Ventilation
Buildings.Fluid.HeatExchangers.ConstantEffectiveness hex(
dp1_nominal=50,
dp2_nominal=50,
show_T=false,
eps=hxEta,
m1_flow_nominal=0.1,
m2_flow_nominal=0.1,
allowFlowReversal1=false,
allowFlowReversal2=false,
redeclare package Medium1 = Buildings.Media.Specialized.Air.PerfectGas,
redeclare package Medium2 = Buildings.Media.Specialized.Air.PerfectGas)
annotation (Placement(transformation(extent={{-70,-6},{-50,14}})));
Buildings.Fluid.HeatExchangers.PrescribedOutlet heat_coil(
dp_nominal=50,
QMin_flow=0,
m_flow_nominal=0.1,
T_start(displayUnit="degC") = 294.15,
allowFlowReversal=false,
redeclare package Medium = Buildings.Media.Specialized.Air.PerfectGas,
show_T=true,
tau=60,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
QMax_flow=hCoilCapacity,
use_X_wSet=false)
annotation (Placement(transformation(extent={{112,0},{132,20}})));
Buildings.Fluid.Sources.MassFlowSource_T boundary(
use_T_in=true,
use_m_flow_in=true,
nPorts=1,
redeclare package Medium = Buildings.Media.Specialized.Air.PerfectGas)
annotation (Placement(transformation(extent={{-94,0},{-74,20}})));
Buildings.Obsolete.Fluid.Sources.FixedBoundary bou(nPorts=1, redeclare
package Medium = Buildings.Media.Specialized.Air.PerfectGas)
annotation (Placement(transformation(
extent={{10,10},{-10,-10}},
rotation=-90,
origin={-70,-34})));
Modelica.Blocks.Interfaces.RealInput TAmb "[degC]"
annotation (Placement(transformation(extent={{-228,-34},{-188,6}})));
Modelica.Blocks.Interfaces.RealInput VFresh "Ventilation airflow rate [m3/h]"
annotation (Placement(transformation(extent={{-228,10},{-188,50}})));
Modelica.Blocks.Interfaces.RealOutput QFlow "Heat added to the air [J]"
annotation (Placement(transformation(extent={{196,122},{216,142}})));
parameter Modelica.SIunits.Efficiency hxEta=0.7
"Heat exchanger effectiveness [-]";
Modelica.Thermal.HeatTransfer.Celsius.ToKelvin toKelvin
annotation (Placement(transformation(extent={{-174,-24},{-154,-4}})));
Modelica.Thermal.HeatTransfer.Celsius.ToKelvin toKelvin2
annotation (Placement(transformation(extent={{-144,132},{-124,152}})));
Modelica.Blocks.Interfaces.RealOutput qEl
"Fan electric energy consumption [W]"
annotation (Placement(transformation(extent={{194,-110},{214,-90}})));
Modelica.Blocks.Interfaces.RealOutput QEl
"Total fan electric energy consumption [J]"
annotation (Placement(transformation(extent={{194,-152},{214,-132}})));
Modelica.Blocks.Continuous.Integrator integrator(initType=Modelica.Blocks.Types.Init.InitialState,
y_start=0)
annotation (Placement(transformation(extent={{140,-152},{160,-132}})));
Modelica.Blocks.Interfaces.RealOutput qFlow "Heat added to the air [W]"
annotation (Placement(transformation(extent={{196,166},{216,186}})));
Buildings.Fluid.Sensors.TemperatureTwoPort T_after_hex(
m_flow_nominal=1,
initType=Modelica.Blocks.Types.Init.SteadyState,
allowFlowReversal=false,
redeclare package Medium = Buildings.Media.Specialized.Air.PerfectGas,
transferHeat=false,
tau=15)
annotation (Placement(transformation(extent={{66,0},{86,20}})));
Modelica.Blocks.Interfaces.RealInput TIndoor "[degC]"
annotation (Placement(transformation(extent={{-228,-72},{-188,-32}})));
Buildings.Fluid.HeatExchangers.PrescribedOutlet IndoorAir(
m_flow_nominal=1,
dp_nominal=50,
allowFlowReversal=false,
redeclare package Medium = Buildings.Media.Specialized.Air.PerfectGas,
tau=15,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
use_X_wSet=false)
annotation (Placement(transformation(extent={{90,-36},{70,-16}})));
Modelica.Thermal.HeatTransfer.Celsius.ToKelvin toKelvin1
annotation (Placement(transformation(extent={{-174,-62},{-154,-42}})));
Modelica.Blocks.Interfaces.RealOutput TAfterHX
"Air temperature after leaving HX [degC]" annotation (Placement(
transformation(
extent={{-10,-10},{10,10}},
rotation=90,
origin={76,206})));
Modelica.Thermal.HeatTransfer.Celsius.FromKelvin fromKelvin annotation (
Placement(transformation(
extent={{-10,-10},{10,10}},
rotation=90,
origin={76,110})));
Modelica.Blocks.Logical.GreaterThreshold greaterThreshold(threshold=0)
annotation (Placement(transformation(extent={{-136,-152},{-116,-132}})));
Modelica.Blocks.Math.BooleanToReal booleanToReal( realFalse=0, realTrue=
qFan)
annotation (Placement(transformation(extent={{78,-152},{98,-132}})));
parameter Real qFan=1000 "Constant fan electricity consumption rate [W]";
Modelica.Blocks.Math.Gain h_coil_efficiency(k=1/coilEta)
annotation (Placement(
transformation(
extent={{-10,-10},{10,10}},
rotation=90,
origin={144,52})));
parameter Real coilEta=0.6 "Heating coil efficiency";
Modelica.Blocks.Math.Gain m3h_to_kgs(k=1.2/3600)
annotation (Placement(transformation(extent={{-180,20},{-160,40}})));
Modelica.Blocks.Continuous.Integrator integrator1(
initType=Modelica.Blocks.Types.Init.InitialState,
y_start=0)
annotation (Placement(transformation(extent={{160,122},{180,142}})));
parameter Modelica.SIunits.HeatFlowRate hCoilCapacity=15000
"Heating capacity of the heating coil";
Modelica.Blocks.Math.BooleanToReal booleanToReal1( realFalse=0, realTrue=
1)
annotation (Placement(transformation(extent={{20,-130},{40,-110}})));
Modelica.Blocks.Math.Product product annotation (Placement(transformation(
extent={{-10,-10},{10,10}},
rotation=90,
origin={138,98})));
Buildings.Fluid.HeatExchangers.PrescribedOutlet correction(
m_flow_nominal=1,
dp_nominal=50,
allowFlowReversal=false,
redeclare package Medium = Buildings.Media.Specialized.Air.PerfectGas,
tau=15,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
use_X_wSet=false)
annotation (Placement(transformation(extent={{26,0},{46,20}})));
Modelica.Blocks.Logical.Switch switch1
annotation (Placement(transformation(extent={{-12,40},{8,60}})));
Buildings.Fluid.Sensors.TemperatureTwoPort T_after_hex1(
m_flow_nominal=1,
initType=Modelica.Blocks.Types.Init.SteadyState,
allowFlowReversal=false,
redeclare package Medium = Buildings.Media.Specialized.Air.PerfectGas,
transferHeat=false,
tau=15)
annotation (Placement(transformation(extent={{-34,0},{-14,20}})));
Modelica.Blocks.Sources.RealExpression realExpression(y=basicFlow)
annotation (Placement(transformation(extent={{-172,52},{-152,72}})));
Modelica.Blocks.Math.Add add
annotation (Placement(transformation(extent={{-138,26},{-118,46}})));
parameter Modelica.Blocks.Interfaces.RealOutput basicFlow=0.1
"Additional flow in the main ventilation loop";
Modelica.Blocks.Interfaces.RealInput Tvestp "Ventilation airflow rate [m3/h]"
annotation (Placement(transformation(extent={{-226,122},{-186,162}})));
equation
connect(toKelvin.Kelvin, boundary.T_in) annotation (Line(points={{-153,
-14},{-110,-14},{-110,14},{-96,14}},
color={0,0,127}));
connect(QEl, integrator.y)
annotation (Line(points={{204,-142},{204,-142},{161,-142}},
color={0,0,127}));
connect(hex.port_b2, bou.ports[1])
annotation (Line(points={{-70,-2},{-70,-2},{-70,-24}}, color={0,127,255}));
connect(TIndoor, toKelvin1.Celsius) annotation (Line(points={{-208,-52},{-208,
-52},{-176,-52}}, color={0,0,127}));
connect(T_after_hex.T, fromKelvin.Kelvin)
annotation (Line(points={{76,21},{76,98}}, color={0,0,127}));
connect(greaterThreshold.y, booleanToReal.u) annotation (Line(points={{-115,
-142},{-115,-142},{76,-142}},
color={255,0,255}));
connect(booleanToReal.y, qEl) annotation (Line(points={{99,-142},{128,
-142},{128,-100},{204,-100}},
color={0,0,127}));
connect(booleanToReal.y, integrator.u)
annotation (Line(points={{99,-142},{99,-142},{138,-142}},
color={0,0,127}));
connect(qEl, qEl)
annotation (Line(points={{204,-100},{204,-100}}, color={0,0,127}));
connect(VFresh,m3h_to_kgs. u)
annotation (Line(points={{-208,30},{-182,30}}, color={0,0,127}));
connect(TAmb, toKelvin.Celsius) annotation (Line(points={{-208,-14},{-192,-14},
{-176,-14}}, color={0,0,127}));
connect(boundary.ports[1], hex.port_a1)
annotation (Line(points={{-74,10},{-70,10}}, color={0,127,255}));
connect(m3h_to_kgs.y, greaterThreshold.u) annotation (Line(points={{-159,30},
{-148,30},{-148,-142},{-138,-142}},
color={0,0,127}));
connect(TAfterHX, TAfterHX)
annotation (Line(points={{76,206},{76,201},{76,206}}, color={0,0,127}));
connect(heat_coil.Q_flow, h_coil_efficiency.u) annotation (Line(points={{133,18},
{144,18},{144,40}}, color={0,0,127}));
connect(fromKelvin.Celsius, TAfterHX) annotation (Line(points={{76,121},{
76,121},{76,206}}, color={0,0,127}));
connect(QFlow, integrator1.y) annotation (Line(points={{206,132},{194,132},
{181,132}}, color={0,0,127}));
connect(heat_coil.port_b, IndoorAir.port_a) annotation (Line(points={{132,
10},{140,10},{140,-26},{90,-26}}, color={0,127,255}));
connect(IndoorAir.port_b, hex.port_a2) annotation (Line(points={{70,-26},
{-50,-26},{-50,-2}}, color={0,127,255}));
connect(toKelvin2.Kelvin, heat_coil.TSet) annotation (Line(points={{-123,
142},{102,142},{102,18},{110,18}}, color={0,0,127}));
connect(greaterThreshold.y, booleanToReal1.u) annotation (Line(points={{
-115,-142},{6,-142},{6,-120},{18,-120}}, color={255,0,255}));
connect(h_coil_efficiency.y, product.u2) annotation (Line(points={{144,63},
{144,63},{144,86}}, color={0,0,127}));
connect(product.y, integrator1.u) annotation (Line(points={{138,109},{138,
109},{138,132},{158,132}}, color={0,0,127}));
connect(product.y, qFlow) annotation (Line(points={{138,109},{138,109},{
138,176},{206,176}}, color={0,0,127}));
connect(booleanToReal1.y, product.u1) annotation (Line(points={{41,-120},
{52,-120},{52,78},{132,78},{132,86}}, color={0,0,127}));
connect(toKelvin.Kelvin, switch1.u3) annotation (Line(points={{-153,-14},
{-110,-14},{-110,42},{-14,42}}, color={0,0,127}));
connect(greaterThreshold.y, switch1.u2) annotation (Line(points={{-115,
-142},{-40,-142},{-40,50},{-14,50}}, color={255,0,255}));
connect(heat_coil.port_a, T_after_hex.port_b)
annotation (Line(points={{112,10},{86,10}}, color={0,127,255}));
connect(T_after_hex.port_a, correction.port_b)
annotation (Line(points={{66,10},{46,10}}, color={0,127,255}));
connect(hex.port_b1, T_after_hex1.port_a)
annotation (Line(points={{-50,10},{-34,10}}, color={0,127,255}));
connect(correction.port_a, T_after_hex1.port_b)
annotation (Line(points={{26,10},{-14,10}}, color={0,127,255}));
connect(T_after_hex1.T, switch1.u1) annotation (Line(points={{-24,21},{
-24,21},{-24,58},{-14,58}}, color={0,0,127}));
connect(toKelvin1.Kelvin, IndoorAir.TSet) annotation (Line(points={{-153,
-52},{104,-52},{104,-18},{92,-18}}, color={0,0,127}));
connect(m3h_to_kgs.y, add.u2)
annotation (Line(points={{-159,30},{-140,30}}, color={0,0,127}));
connect(add.u1, realExpression.y) annotation (Line(points={{-140,42},{
-146,42},{-146,62},{-151,62}}, color={0,0,127}));
connect(add.y, boundary.m_flow_in) annotation (Line(points={{-117,36},{-104,
36},{-104,18},{-96,18}}, color={0,0,127}));
connect(switch1.y, correction.TSet) annotation (Line(points={{9,50},{18,50},
{18,18},{24,18}}, color={0,0,127}));
connect(toKelvin2.Celsius, Tvestp) annotation (Line(points={{-146,142},{-156,142},
{-206,142}}, color={0,0,127}));
annotation (Icon(coordinateSystem(preserveAspectRatio=false,
extent={{-200,-200},{200,200}},
initialScale=0.1), graphics={
Rectangle(extent={{-200,200},{200,-200}}, lineColor={28,108,200}),
Ellipse(extent={{0,40},{80,-40}}, lineColor={28,108,200}),
Polygon(
points={{20,34},{20,-34},{80,0},{20,34}},
lineColor={28,108,200},
fillColor={28,108,200},
fillPattern=FillPattern.Solid),
Line(
points={{0,40},{-20,40},{-60,-40},{-80,-40}},
color={255,0,0},
smooth=Smooth.Bezier,
thickness=1),
Line(
points={{-80,40},{-60,40},{-20,-40},{0,-40}},
color={28,108,200},
smooth=Smooth.Bezier,
thickness=1)}), Diagram(coordinateSystem(preserveAspectRatio=false,
extent={{-200,-200},{200,200}},
initialScale=0.1)));
end Ventilation;