modelPartialReliefReturnSection
Interface class for relief/return air section
Information
This class provides a standard interface for the relief/return air section of an air handler. Typical components in that section include
- shut off relief (or exhaust) air dampers,
- the relief air side of the heat recovery unit,
- the relief damper of the air economizer,
- the relief or return fan.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | nFanRet | Number of return fans | |
| Integer | nFanRel | Number of relief fans | |
| Boolean | have_recHea | Set to true in case of heat recovery | |
| Buildings.Templates.AirHandlersFans.Types.ControlFanReturn | typCtlFanRet | Return fan control type | |
| Buildings.Controls.OBC.ASHRAE.G36.Types.ControlEconomizer | typCtlEco | Economizer control type | |
| Buildings.Templates.AirHandlersFans.Components.Data.OutdoorReliefReturnSection | dat | Design and operating parameters | |
| Configuration | |||
| Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection | typ | Relief/return air section type | |
| Buildings.Templates.Components.Types.Damper | typDamRel | Relief damper type | |
| Buildings.Templates.Components.Types.Fan | typFanRel | Relief fan type | |
| Buildings.Templates.Components.Types.Fan | typFanRet | Return fan type | |
| Nominal condition | |||
| Modelica.Units.SI.MassFlowRate | m_flow_nominal | if typFanRet <> Buildings.Templates.Components.Types.Fan.None then dat.fanRet.m_flow_nominal elseif typFanRel <> Buildings.Templates.Components.Types.Fan.None then dat.fanRel.m_flow_nominal elseif typDamRel <> Buildings.Templates.Components.Types.Damper.None then dat.damRel.m_flow_nominal else dat.damRet.m_flow_nominal | Air mass flow rate |
| Modelica.Units.SI.PressureDifference | dpFan_nominal | if typFanRel <> Buildings.Templates.Components.Types.Fan.None then dat.fanRel.dp_nominal elseif typFanRet <> Buildings.Templates.Components.Types.Fan.None then dat.fanRet.dp_nominal else 0 | Relief/return fan total pressure rise |
| Dynamics › Conservation equations | |||
| Modelica.Fluid.Types.Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamics.DynamicFreeInitial | 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 | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Interfaces.FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) | |
| Modelica.Fluid.Interfaces.FluidPort_a | port_aHeaRec | Optional fluid connector for heat recovery | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_bHeaRec | Optional fluid connector for heat recovery | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_bRet | Optional fluid connector for return branch | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_bPre | Fluid connector for differential pressure sensor | |
| Buildings.Templates.AirHandlersFans.Interfaces.Bus | bus | Control bus |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Fluid.FixedResistances.Junction | splEco | Splitter with air economizer | |
| Buildings.Templates.Components.Sensors.DifferentialPressure | pAirRet_rel | Return fan discharge static pressure sensor |
Contents
| Name | Description |
|---|---|
 MediumAir |