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 |
Components
| 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 |
| 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 | |