blockApparatusDryPoint
Calculates air properties at dry coil surface
Extends from Buildings.Fluid.DXSystems.Cooling.BaseClasses.PartialSurfaceCondition (Partial block for apparatus dew and dry point calculation).
Information
This blocks outputs the state of the moist air at of the coil, assuming no condensation occurs. The bypass factor of the coil and the resulting enthalpy difference is computed by its base class Buildings.Fluid.DXSystems.Cooling.BaseClasses.PartialSurfaceCondition.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Fluid.DXSystems.Cooling.AirSource.Data.Generic.DXCoil | datCoi (from EssentialParameters) | Performance data | |
| Boolean | variableSpeedCoil (from PartialSurfaceCondition) | Flag, set to true to interpolate data | |
| Modelica.Units.SI.MassFlowRate | m_flow_small (from PartialSurfaceCondition) | datCoi.m_flow_small | Small mass flow rate for the evaporator, used for regularization |
| Modelica.Units.SI.AngularVelocity | maxSpe (from PartialSurfaceCondition) | datCoi.sta[nSta].spe | Maximum rotational speed |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | speRat (from PartialSurfaceCondition) | Speed index | |
| Modelica.Blocks.Interfaces.RealInput | Q_flow (from PartialSurfaceCondition) | Cooling capacity of the coil | |
| Modelica.Blocks.Interfaces.RealInput | m_flow (from PartialSurfaceCondition) | Evaporator air mass flow rate | |
| Modelica.Blocks.Interfaces.RealInput | p (from PartialSurfaceCondition) | Evaporator air static pressure | |
| Modelica.Blocks.Interfaces.RealInput | XEvaIn (from PartialSurfaceCondition) | Evaporator inlet air mass fraction | |
| Modelica.Blocks.Interfaces.RealInput | hEvaIn (from PartialSurfaceCondition) | Evaporator air inlet specific enthalpy | |
| Modelica.Blocks.Interfaces.IntegerInput | stage (from PartialSurfaceCondition) | Stage of coil, or 0/1 for variable-speed coil | |
| Modelica.Blocks.Interfaces.RealOutput | TDry | Dry bulb temperature of air at dry coil condition |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | bypass (from PartialSurfaceCondition) | Bypass factor | |
| Modelica.Units.SI.AngularVelocity | spe (from PartialSurfaceCondition) | Rotational speed | |
| Buildings.Fluid.DXSystems.Cooling.BaseClasses.UACp[nSta] | uacp (from PartialSurfaceCondition) | Calculates UA/Cp of the coil | |
| Modelica.Units.SI.SpecificEnthalpy | hDry | Enthalpy of air at coil surface |
Revisions
-
September 21, 2012 by Michael Wetter:
Revised implementation and documentation. -
April 9, 2012 by Kaustubh Phalak:
First implementation.