.BuildingSystems.Utilities.Psychrometrics.X_pTphi

Information

Block to compute the water vapor concentration based on pressure, temperature and relative humidity.

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.

Contents

Name	Description
Medium	Medium model

Revisions

• November 3, 2017 by Filip Jorissen:
  Converted (initial) algorithm section into (initial) equation section. See #847.
• July 24, 2014 by Michael Wetter:
  Added assert to verify that Medium.nX==2 as the implementation is only valid for such media.
• April 26, 2013 by Michael Wetter:
  Set the medium model to BuildingSystems.Media.Air. This was required to allow a pedantic model check in Dymola 2014.
• August 21, 2012 by Michael Wetter:
  Added function call to compute water vapor content.
• February 22, 2010 by Michael Wetter:
  Improved the code that searches for the index of 'water' in the medium model.
• February 17, 2010 by Michael Wetter:
  Renamed block from MassFraction_pTphi to X_pTphi
• February 4, 2009 by Michael Wetter:
  First implementation.