diff --git a/Buildings/Controls/OBC/ASHRAE/PrimarySystem/ChillerPlant/Generic/PlantEnable.mo b/Buildings/Controls/OBC/ASHRAE/PrimarySystem/ChillerPlant/Generic/PlantEnable.mo
index 40cfd03202d..7caf1a66490 100644
--- a/Buildings/Controls/OBC/ASHRAE/PrimarySystem/ChillerPlant/Generic/PlantEnable.mo
+++ b/Buildings/Controls/OBC/ASHRAE/PrimarySystem/ChillerPlant/Generic/PlantEnable.mo
@@ -1,4 +1,4 @@
-within Buildings.Controls.OBC.ASHRAE.PrimarySystem.ChillerPlant.Generic;
+within Buildings.Controls.OBC.ASHRAE.PrimarySystem.ChillerPlant.Generic;
block PlantEnable "Sequence to enable and disable plant"
parameter Boolean have_WSE = true
@@ -7,20 +7,17 @@ block PlantEnable "Sequence to enable and disable plant"
parameter Real schTab[4,2] = [0,1; 6*3600,1; 19*3600,1; 24*3600,1]
"Plant enabling schedule allowing operators to lock out the plant during off-hour";
- parameter Real TChiLocOut(
- final unit="K",
- final quantity="ThermodynamicTemperature",
- displayUnit="degC")=277.5
+ parameter Real TChiLocOut=277.5
"Outdoor air lockout temperature below which the chiller plant should be disabled";
parameter Real plaThrTim(
final unit="s",
- final quantity="Time")=15*60
+ final quantity="Time")=900
"Threshold time to check status of chiller plant";
parameter Real reqThrTim(
final unit="s",
- final quantity="Time")=3*60
+ final quantity="Time")=180
"Threshold time to check current chiller plant request";
parameter Integer ignReq = 0
@@ -47,13 +44,6 @@ block PlantEnable "Sequence to enable and disable plant"
annotation (Placement(transformation(extent={{200,70},{220,90}}),
iconTransformation(extent={{100,-10},{120,10}})));
- Buildings.Controls.OBC.CDL.Continuous.Sources.TimeTable enaSch(
- final table=schTab,
- final smoothness=tabSmo,
- final extrapolation=extrapolation)
- "Plant enabling schedule allowing operators to lock out the plant during off-hour"
- annotation (Placement(transformation(extent={{-140,40},{-120,60}})));
-
protected
final parameter Buildings.Controls.OBC.CDL.Types.Smoothness tabSmo=
Buildings.Controls.OBC.CDL.Types.Smoothness.ConstantSegments
@@ -63,6 +53,13 @@ protected
Buildings.Controls.OBC.CDL.Types.Extrapolation.Periodic
"Extrapolation of data outside the definition range";
+ Buildings.Controls.OBC.CDL.Continuous.Sources.TimeTable enaSch(
+ final table=schTab,
+ final smoothness=tabSmo,
+ final extrapolation=extrapolation)
+ "Plant enabling schedule allowing operators to lock out the plant during off-hour"
+ annotation (Placement(transformation(extent={{-140,40},{-120,60}})));
+
Buildings.Controls.OBC.CDL.Continuous.GreaterThreshold schOn(
final t=0.5)
"Check if enabling schedule is active"
@@ -81,8 +78,8 @@ protected
"Check if the number of chiller plant request is greater than the number of ignorable request"
annotation (Placement(transformation(extent={{-140,80},{-120,100}})));
- Buildings.Controls.OBC.CDL.Logical.MultiAnd mulAnd(
- final nu=4) "Logical and receiving multiple input"
+ Buildings.Controls.OBC.CDL.Logical.MultiAnd enaPla(
+ final nu=4) "Enable chiller plant"
annotation (Placement(transformation(extent={{40,70},{60,90}})));
Buildings.Controls.OBC.CDL.Logical.Timer enaTim(
@@ -98,26 +95,29 @@ protected
Buildings.Controls.OBC.CDL.Logical.Not not2 "Logical not"
annotation (Placement(transformation(extent={{-20,-60},{0,-40}})));
- Buildings.Controls.OBC.CDL.Logical.And and2 "Logical and"
+ Buildings.Controls.OBC.CDL.Logical.And disPla
+ "Disable chiller plant"
annotation (Placement(transformation(extent={{40,-20},{60,0}})));
- Buildings.Controls.OBC.CDL.Logical.Latch lat
- "Maintains an on signal until conditions changes"
+ Buildings.Controls.OBC.CDL.Logical.Latch plaSta
+ "Chiller plant enabling status"
annotation (Placement(transformation(extent={{100,70},{120,90}})));
Buildings.Controls.OBC.CDL.Continuous.Hysteresis hys(
final uLow=0,
final uHigh=locDt)
- "Check if outdoor temperature is higher than chiller lockout temperature"
+ "Check if outdoor temperature is lower than chiller lockout temperature"
annotation (Placement(transformation(extent={{-100,-140},{-80,-120}})));
- Buildings.Controls.OBC.CDL.Logical.Or3 mulOr "Logical or"
+ Buildings.Controls.OBC.CDL.Logical.Or3 disPlaCon
+ "Disable chiller plant conditions"
annotation (Placement(transformation(extent={{40,-80},{60,-60}})));
Buildings.Controls.OBC.CDL.Logical.Not not3 "Logical not"
annotation (Placement(transformation(extent={{-140,-80},{-120,-60}})));
- Buildings.Controls.OBC.CDL.Logical.Not not4 "Logical not"
+ Buildings.Controls.OBC.CDL.Logical.Not notLoc
+ "Check if outdoor temperature is higher than the chiller lockout temperature"
annotation (Placement(transformation(extent={{-20,0},{0,20}})));
Buildings.Controls.OBC.CDL.Logical.Pre pre1 "Pre"
@@ -128,7 +128,9 @@ protected
"Outdoor air lockout temperature"
annotation (Placement(transformation(extent={{-180,-120},{-160,-100}})));
- Buildings.Controls.OBC.CDL.Continuous.Add add2(final k1=1, final k2=-1)
+ Buildings.Controls.OBC.CDL.Continuous.Add add2(
+ final k1=1,
+ final k2=-1)
"Difference between chiller lockout temperature and outdoor temperature"
annotation (Placement(transformation(extent={{-140,-140},{-120,-120}})));
@@ -139,35 +141,33 @@ equation
annotation (Line(points={{-118,120},{-102,120}}, color={255,0,255}));
connect(chiWatSupResReq, hasReq.u)
annotation (Line(points={{-220,90},{-142,90}}, color={255,127,0}));
- connect(disTim.passed, mulAnd.u[1])
+ connect(disTim.passed,enaPla. u[1])
annotation (Line(points={{-78,112},{20,112},{20,85.25},{38,85.25}},
color={255,0,255}));
- connect(hasReq.y, mulAnd.u[2])
+ connect(hasReq.y,enaPla. u[2])
annotation (Line(points={{-118,90},{-20,90},{-20,81.75},{38,81.75}},
color={255,0,255}));
- connect(schOn.y, mulAnd.u[3])
+ connect(schOn.y,enaPla. u[3])
annotation (Line(points={{-78,50},{0,50},{0,78.25},{38,78.25}},
color={255,0,255}));
connect(schOn.y, not2.u)
annotation (Line(points={{-78,50},{-40,50},{-40,-50},{-22,-50}},
color={255,0,255}));
- connect(mulAnd.y, lat.u)
- annotation (Line(points={{62,80},{98,80}}, color={255,0,255}));
- connect(lat.y, yPla)
- annotation (Line(points={{122,80},{210,80}}, color={255,0,255}));
- connect(mulOr.y, and2.u2)
- annotation (Line(points={{62,-70},{80,-70},{80,-30},{20,-30},{20,-18},{38,-18}},
- color={255,0,255}));
- connect(not2.y, mulOr.u1)
- annotation (Line(points={{2,-50},{20,-50},{20,-62},{38,-62}}, color={255,0,255}));
+ connect(enaPla.y, plaSta.u)
+ annotation (Line(points={{62,80},{98,80}}, color={255,0,255}));
+ connect(plaSta.y, yPla)
+ annotation (Line(points={{122,80},{210,80}}, color={255,0,255}));
+ connect(disPlaCon.y, disPla.u2) annotation (Line(points={{62,-70},{80,-70},{80,
+ -30},{20,-30},{20,-18},{38,-18}}, color={255,0,255}));
+ connect(not2.y, disPlaCon.u1) annotation (Line(points={{2,-50},{20,-50},{20,-62},
+ {38,-62}}, color={255,0,255}));
connect(hasReq.y, not3.u)
annotation (Line(points={{-118,90},{-20,90},{-20,70},{-180,70},{-180,-70},{-142,
-70}}, color={255,0,255}));
connect(not3.y, enaTim1.u)
annotation (Line(points={{-118,-70},{-102,-70}}, color={255,0,255}));
- connect(lat.y, pre1.u)
- annotation (Line(points={{122,80},{140,80},{140,140},{-190,140},{-190,120},{
- -182,120}}, color={255,0,255}));
+ connect(plaSta.y, pre1.u) annotation (Line(points={{122,80},{140,80},{140,140},
+ {-190,140},{-190,120},{-182,120}}, color={255,0,255}));
connect(pre1.y, not1.u)
annotation (Line(points={{-158,120},{-142,120}}, color={255,0,255}));
connect(pre1.y, enaTim.u)
@@ -181,24 +181,18 @@ equation
color={0,0,127}));
connect(add2.y, hys.u)
annotation (Line(points={{-118,-130},{-102,-130}}, color={0,0,127}));
- connect(hys.y, mulOr.u3)
- annotation (Line(points={{-78,-130},{20,-130},{20,-78},{38,-78}},
- color={255,0,255}));
- connect(hys.y, not4.u)
- annotation (Line(points={{-78,-130},{-70,-130},{-70,10},{-22,10}},
- color={255,0,255}));
- connect(not4.y, mulAnd.u[4])
- annotation (Line(points={{2,10},{20,10},{20,74.75},{38,74.75}},
- color={255,0,255}));
- connect(and2.y, lat.clr)
- annotation (Line(points={{62,-10},{80,-10},{80,74},{98,74}},
- color={255,0,255}));
- connect(enaTim1.passed, mulOr.u2)
- annotation (Line(points={{-78,-78},{-20,-78},{-20,-70},{38,-70}},
- color={255,0,255}));
- connect(enaTim.passed, and2.u1)
- annotation (Line(points={{-118,-18},{-80,-18},{-80,-10},{38,-10}},
- color={255,0,255}));
+ connect(hys.y, disPlaCon.u3) annotation (Line(points={{-78,-130},{20,-130},{20,
+ -78},{38,-78}}, color={255,0,255}));
+ connect(hys.y, notLoc.u) annotation (Line(points={{-78,-130},{-60,-130},{-60,10},
+ {-22,10}}, color={255,0,255}));
+ connect(notLoc.y, enaPla.u[4]) annotation (Line(points={{2,10},{20,10},{20,74.75},
+ {38,74.75}}, color={255,0,255}));
+ connect(disPla.y, plaSta.clr) annotation (Line(points={{62,-10},{80,-10},{80,74},
+ {98,74}}, color={255,0,255}));
+ connect(enaTim1.passed, disPlaCon.u2) annotation (Line(points={{-78,-78},{-20,
+ -78},{-20,-70},{38,-70}}, color={255,0,255}));
+ connect(enaTim.passed, disPla.u1) annotation (Line(points={{-118,-18},{-80,-18},
+ {-80,-10},{38,-10}}, color={255,0,255}));
annotation (
defaultComponentName = "plaEna",
@@ -233,8 +227,8 @@ annotation (
Block that generate chiller plant enable signals and output the initial plant stage,
according to ASHRAE RP-1711 Advanced Sequences of Operation for HVAC Systems Phase II –
-Central Plants and Hydronic Systems (Draft 4 on January 7, 2019), section 5.2.2 and
-5.2.4.13 Table 2.
+Central Plants and Hydronic Systems (Draft on March 23, 2020), section 5.2.2.1,
+5.2.2.2 and 5.2.2.3.
The chiller plant should be enabled and disabled according to following sequences: