Buildings.Utilities.Psychrometrics.BaseClasses

Information

This package contains base classes that are used to construct the models in Buildings.Utilities.Psychrometrics.

Extends from Modelica.Icons.BasesPackage (Icon for packages containing base classes).

Package Content

Name	Description
HumidityRatioVaporPressure	Humidity ratio for given water vapor pressure

Buildings.Utilities.Psychrometrics.BaseClasses.HumidityRatioVaporPressure

Information

Partial Block to compute the relation between humidity ratio and water vapor partial pressure.

If use_p_in is false (default option), the p parameter is used as atmospheric pressure, and the p_in input connector is disabled; if use_p_in is true, then the p parameter is ignored, and the value provided by the input connector is used instead.

Extends from Modelica.Blocks.Interfaces.BlockIcon (Basic graphical layout of input/output block).

Parameters

Type	Name	Default	Description
Boolean	use_p_in	true	Get the pressure from the input connector
Pressure	p	101325	Fixed value of pressure [Pa]

Connectors

Type	Name	Description
input RealInput	p_in	Atmospheric Pressure [Pa]

Modelica definition

partial block HumidityRatioVaporPressure 
  "Humidity ratio for given water vapor pressure"
  extends Modelica.Blocks.Interfaces.BlockIcon;
  parameter Boolean use_p_in = true "Get the pressure from the input connector";

  parameter Modelica.SIunits.Pressure p = 101325 "Fixed value of pressure";
  Modelica.Blocks.Interfaces.RealInput p_in(final quantity="Pressure",
                                         final unit="Pa",
                                         min = 0) if  use_p_in 
    "Atmospheric Pressure";

protected 
  Modelica.Blocks.Interfaces.RealInput p_in_internal 
    "Needed to connect to conditional connector";
equation 
  connect(p_in, p_in_internal);
  if not use_p_in then
    p_in_internal = p;
  end if;
end HumidityRatioVaporPressure;