Buildings.Templates.AirHandlersFans.Components.ReliefReturnSection
Models for relief/return air section
Information
Components inside that package represent the relief/return air section of an air handler.
Extends from Modelica.Icons.VariantsPackage (Icon for package containing variants).
Package Content
| Name | Description |
|---|---|
 NoRelief
|
No relief branch |
 NoReturn
|
No return branch |
 ReliefDamper
|
Modulating relief damper without fan |
| ReliefFan
|
Relief fan with two-position relief damper |
| ReturnFan
|
Return fan with modulating relief damper |
Buildings.Templates.AirHandlersFans.Components.ReliefReturnSection.NoRelief
No relief branch
Information
This model represents a configuration with an air economizer and no relief branch. The return fan is optional.
Extends from Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialReliefReturnSection (Interface class for relief/return air section).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| OutdoorReliefReturnSection | dat | Design and operating parameters | |
| Configuration | |||
| ReliefReturnSection | typ | Buildings.Templates.AirHandl... | Relief/return air section type |
| Damper | typDamRel | Buildings.Templates.Componen... | Relief damper type |
| Fan | typFanRel | Buildings.Templates.Componen... | Relief fan type |
| Fan | typFanRet | fanRet.typ | Return fan type |
| Exhaust/relief/return section | |||
| None | fanRet | redeclare Buildings.Template... | Return fan |
| Dynamics | |||
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversal | true | = false to simplify equations, assuming, but not enforcing, no flow reversal |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| FluidPort_a | port_aHeaRec | Optional fluid connector for heat recovery |
| FluidPort_b | port_bHeaRec | Optional fluid connector for heat recovery |
| FluidPort_b | port_bRet | Optional fluid connector for return branch |
| FluidPort_b | port_bPre | Fluid connector for differential pressure sensor |
| Bus | bus | Control bus |
Modelica definition
model NoRelief "No relief branch"
extends Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialReliefReturnSection
(
final typ=Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.NoRelief,
final typDamRel=Buildings.Templates.Components.Types.Damper.None,
final typFanRel=Buildings.Templates.Components.Types.Fan.None,
final typFanRet=fanRet.typ);
replaceable Buildings.Templates.Components.Fans.None fanRet
constrainedby Buildings.Templates.Components.Interfaces.PartialFan(
redeclare final package Medium = MediumAir,
final energyDynamics=energyDynamics,
final allowFlowReversal=allowFlowReversal,
final dat=dat.fanRet,
final have_senFlo=
typCtlFanRet==Buildings.Templates.AirHandlersFans.Types.ControlFanReturn.AirflowMeasured,
final text_flip=true)
"Return fan";
equation
/* Control point connection - start */
connect(fanRet.bus, bus.fanRet);
/* Control point connection - end */
connect(fanRet.port_b, splEco.port_1);
connect(fanRet.port_a, port_a);
end NoRelief;
Buildings.Templates.AirHandlersFans.Components.ReliefReturnSection.NoReturn
No return branch
Information
This model represents a configuration with no air economizer for 100% outdoor air applications (such as DOAS).
Extends from Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialReliefReturnSection (Interface class for relief/return air section).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| OutdoorReliefReturnSection | dat | Design and operating parameters | |
| SingleVariable | fanRet | redeclare Buildings.Template... | Return fan |
| Configuration | |||
| ReliefReturnSection | typ | Buildings.Templates.AirHandl... | Relief/return air section type |
| Damper | typDamRel | damRel.typ | Relief damper type |
| Fan | typFanRel | Buildings.Templates.Componen... | Relief fan type |
| Fan | typFanRet | fanRet.typ | Return fan type |
| Dynamics | |||
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversal | true | = false to simplify equations, assuming, but not enforcing, no flow reversal |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| FluidPort_a | port_aHeaRec | Optional fluid connector for heat recovery |
| FluidPort_b | port_bHeaRec | Optional fluid connector for heat recovery |
| FluidPort_b | port_bRet | Optional fluid connector for return branch |
| FluidPort_b | port_bPre | Fluid connector for differential pressure sensor |
| Bus | bus | Control bus |
Modelica definition
model NoReturn "No return branch"
extends Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialReliefReturnSection
(
final typ=Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.NoReturn,
final typDamRel=damRel.typ,
final typFanRel=Buildings.Templates.Components.Types.Fan.None,
final typFanRet=fanRet.typ);
Buildings.Templates.Components.Dampers.TwoPosition damRel(
redeclare final package Medium = MediumAir,
final dat=dat.damRel,
use_inputFilter=energyDynamics<>Modelica.Fluid.Types.Dynamics.SteadyState,
final allowFlowReversal=allowFlowReversal,
final text_flip=true)
"Relief damper";
replaceable Buildings.Templates.Components.Fans.SingleVariable fanRet
constrainedby Buildings.Templates.Components.Interfaces.PartialFan(
redeclare final package Medium = MediumAir,
final dat=dat.fanRet,
final energyDynamics=energyDynamics,
final allowFlowReversal=allowFlowReversal,
final have_senFlo=
typCtlFanRet==Buildings.Templates.AirHandlersFans.Types.ControlFanReturn.AirflowMeasured,
final text_flip=true)
"Return fan";
equation
/* Control point connection - start */
connect(fanRet.bus, bus.fanRet);
connect(damRel.bus, bus.damRel);
/* Control point connection - end */
connect(port_b, damRel.port_b);
connect(damRel.port_a, splEco.port_2);
connect(splEco.port_1, fanRet.port_b);
connect(fanRet.port_a, port_a);
end NoReturn;
Buildings.Templates.AirHandlersFans.Components.ReliefReturnSection.ReliefDamper
Modulating relief damper without fan
Information
This model represents a configuration with an air economizer and an actuated relief damper (modulating) without fan.
Extends from Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialReliefReturnSection (Interface class for relief/return air section).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| OutdoorReliefReturnSection | dat | Design and operating parameters | |
| Configuration | |||
| ReliefReturnSection | typ | Buildings.Templates.AirHandl... | Relief/return air section type |
| Damper | typDamRel | damRel.typ | Relief damper type |
| Fan | typFanRel | Buildings.Templates.Componen... | Relief fan type |
| Fan | typFanRet | Buildings.Templates.Componen... | Return fan type |
| Dynamics | |||
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversal | true | = false to simplify equations, assuming, but not enforcing, no flow reversal |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| FluidPort_a | port_aHeaRec | Optional fluid connector for heat recovery |
| FluidPort_b | port_bHeaRec | Optional fluid connector for heat recovery |
| FluidPort_b | port_bRet | Optional fluid connector for return branch |
| FluidPort_b | port_bPre | Fluid connector for differential pressure sensor |
| Bus | bus | Control bus |
Modelica definition
model ReliefDamper "Modulating relief damper without fan"
extends Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialReliefReturnSection
(
final typ=Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.ReliefDamper,
final typDamRel=damRel.typ,
final typFanRel=Buildings.Templates.Components.Types.Fan.None,
final typFanRet=Buildings.Templates.Components.Types.Fan.None);
Buildings.Templates.Components.Dampers.Modulating damRel(
redeclare final package Medium = MediumAir,
use_inputFilter=energyDynamics<>Modelica.Fluid.Types.Dynamics.SteadyState,
final allowFlowReversal=allowFlowReversal,
final dat=dat.damRel,
final text_flip=true,
typBla=Buildings.Templates.Components.Types.DamperBlades.Opposed)
"Relief damper";
equation
/* Control point connection - start */
connect(damRel.bus, bus.damRel);
/* Control point connection - end */
connect(port_b, damRel.port_b);
connect(damRel.port_a, splEco.port_2);
connect(splEco.port_1, port_a);
end ReliefDamper;
Buildings.Templates.AirHandlersFans.Components.ReliefReturnSection.ReliefFan
Relief fan with two-position relief damper
Information
This model represents a configuration with an air economizer and a relief fan with an actuated relief damper (two-position).
Extends from Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialReliefReturnSection (Interface class for relief/return air section).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| OutdoorReliefReturnSection | dat | Design and operating parameters | |
| SingleVariable | fanRel | redeclare Buildings.Template... | Relief fan |
| Configuration | |||
| ReliefReturnSection | typ | Buildings.Templates.AirHandl... | Relief/return air section type |
| Damper | typDamRel | damRel.typ | Relief damper type |
| Fan | typFanRel | fanRel.typ | Relief fan type |
| Fan | typFanRet | Buildings.Templates.Componen... | Return fan type |
| Dynamics | |||
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversal | true | = false to simplify equations, assuming, but not enforcing, no flow reversal |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| FluidPort_a | port_aHeaRec | Optional fluid connector for heat recovery |
| FluidPort_b | port_bHeaRec | Optional fluid connector for heat recovery |
| FluidPort_b | port_bRet | Optional fluid connector for return branch |
| FluidPort_b | port_bPre | Fluid connector for differential pressure sensor |
| Bus | bus | Control bus |
Modelica definition
model ReliefFan "Relief fan with two-position relief damper"
extends Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialReliefReturnSection
(
final typ=Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.ReliefFan,
final typDamRel=damRel.typ,
final typFanRel=fanRel.typ,
final typFanRet=Buildings.Templates.Components.Types.Fan.None);
Buildings.Templates.Components.Dampers.TwoPosition damRel(
redeclare final package Medium = MediumAir,
use_inputFilter=energyDynamics<>Modelica.Fluid.Types.Dynamics.SteadyState,
final allowFlowReversal=allowFlowReversal,
final dat=dat.damRel,
final text_flip=true)
"Relief damper";
replaceable Buildings.Templates.Components.Fans.SingleVariable fanRel
constrainedby Buildings.Templates.Components.Interfaces.PartialFan(
redeclare final package Medium = MediumAir,
final dat=dat.fanRel,
final energyDynamics=energyDynamics,
final allowFlowReversal=allowFlowReversal,
final have_senFlo=false,
final text_flip=true,
typSin=Buildings.Templates.Components.Types.FanSingle.Propeller)
"Relief fan";
equation
/* Control point connection - start */
connect(fanRel.bus, bus.fanRel);
connect(damRel.bus, bus.damRel);
/* Control point connection - end */
connect(port_b, damRel.port_b);
connect(damRel.port_a, fanRel.port_b);
connect(fanRel.port_a, splEco.port_2);
connect(splEco.port_1, port_a);
end ReliefFan;
Buildings.Templates.AirHandlersFans.Components.ReliefReturnSection.ReturnFan
Return fan with modulating relief damper
Information
This model represents a configuration with an air economizer and a return fan with an actuated relief damper (modulating).
Extends from Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialReliefReturnSection (Interface class for relief/return air section).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| OutdoorReliefReturnSection | dat | Design and operating parameters | |
| SingleVariable | fanRet | redeclare Buildings.Template... | Return fan |
| Configuration | |||
| ReliefReturnSection | typ | Buildings.Templates.AirHandl... | Relief/return air section type |
| Damper | typDamRel | damRel.typ | Relief damper type |
| Fan | typFanRel | Buildings.Templates.Componen... | Relief fan type |
| Fan | typFanRet | fanRet.typ | Return fan type |
| Dynamics | |||
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversal | true | = false to simplify equations, assuming, but not enforcing, no flow reversal |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| FluidPort_a | port_aHeaRec | Optional fluid connector for heat recovery |
| FluidPort_b | port_bHeaRec | Optional fluid connector for heat recovery |
| FluidPort_b | port_bRet | Optional fluid connector for return branch |
| FluidPort_b | port_bPre | Fluid connector for differential pressure sensor |
| Bus | bus | Control bus |
Modelica definition
model ReturnFan "Return fan with modulating relief damper"
extends Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialReliefReturnSection
(
final typ=Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.ReturnFan,
final typDamRel=damRel.typ,
final typFanRel=Buildings.Templates.Components.Types.Fan.None,
final typFanRet=fanRet.typ);
Buildings.Templates.Components.Dampers.Modulating damRel(
redeclare final package Medium = MediumAir,
final dat=dat.damRel,
use_inputFilter=energyDynamics<>Modelica.Fluid.Types.Dynamics.SteadyState,
final allowFlowReversal=allowFlowReversal,
final text_flip=true)
"Relief damper";
replaceable Buildings.Templates.Components.Fans.SingleVariable fanRet
constrainedby Buildings.Templates.Components.Interfaces.PartialFan(
redeclare final package Medium = MediumAir,
final dat=dat.fanRet,
final energyDynamics=energyDynamics,
final allowFlowReversal=allowFlowReversal,
final have_senFlo=
typCtlFanRet==Buildings.Templates.AirHandlersFans.Types.ControlFanReturn.AirflowMeasured,
final text_flip=true)
"Return fan";
equation
/* Control point connection - start */
connect(fanRet.bus, bus.fanRet);
connect(damRel.bus, bus.damRel);
/* Control point connection - end */
connect(port_b, damRel.port_b);
connect(fanRet.port_b, splEco.port_1);
connect(damRel.port_a, splEco.port_2);
connect(fanRet.port_a, port_a);
end ReturnFan;