blockApparatusDewPoint

Calculates air properties at apparatus dew point
Diagram of ApparatusDewPointOpen the diagram
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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 the dew point of the coil. The bypass factor of the coil and the resulting enthalpy difference is computed by its base class Buildings.Fluid.DXSystems.Cooling.BaseClasses.PartialSurfaceCondition.

Parameters

TypeNameDefaultDescription
Buildings.Fluid.DXSystems.Cooling.AirSource.Data.Generic.DXCoildatCoi (from EssentialParameters)Performance data
BooleanvariableSpeedCoil (from PartialSurfaceCondition)Flag, set to true to interpolate data
Modelica.Units.SI.MassFlowRatem_flow_small (from PartialSurfaceCondition)datCoi.m_flow_smallSmall mass flow rate for the evaporator, used for regularization
Modelica.Units.SI.AngularVelocitymaxSpe (from PartialSurfaceCondition)datCoi.sta[nSta].speMaximum rotational speed

Connectors

TypeNameDefaultDescription
Modelica.Blocks.Interfaces.RealInputspeRat (from PartialSurfaceCondition)Speed index
Modelica.Blocks.Interfaces.RealInputQ_flow (from PartialSurfaceCondition)Cooling capacity of the coil
Modelica.Blocks.Interfaces.RealInputm_flow (from PartialSurfaceCondition)Evaporator air mass flow rate
Modelica.Blocks.Interfaces.RealInputp (from PartialSurfaceCondition)Evaporator air static pressure
Modelica.Blocks.Interfaces.RealInputXEvaIn (from PartialSurfaceCondition)Evaporator inlet air mass fraction
Modelica.Blocks.Interfaces.RealInputhEvaIn (from PartialSurfaceCondition)Evaporator air inlet specific enthalpy
Modelica.Blocks.Interfaces.IntegerInputstage (from PartialSurfaceCondition)Stage of coil, or 0/1 for variable-speed coil
Modelica.Blocks.Interfaces.RealOutputhADPSpecific enthalpy of air at apparatus dew point
Modelica.Blocks.Interfaces.RealOutputXADPHumidity mass fraction of air at apparatus dew point
Modelica.Blocks.Interfaces.RealOutputTADPDry bulb temperature of air at apparatus dew point

Components

TypeNameDefaultDescription
Realbypass (from PartialSurfaceCondition)Bypass factor
Modelica.Units.SI.AngularVelocityspe (from PartialSurfaceCondition)Rotational speed
Buildings.Fluid.DXSystems.Cooling.BaseClasses.UACp[nSta]uacp (from PartialSurfaceCondition)Calculates UA/Cp of the coil

Revisions

  • September 21, 2012 by Michael Wetter:
    Revised implementation and documentation.
  • July 4, 2012 by Kaustubh Phalak:
    Updated to handle zero mass flow rate and freezing coil condition.
  • April 9, 2012 by Kaustubh Phalak:
    First implementation.