.Buildings.Fluid.DXSystems.Cooling.AirSource.Validation.SingleSpeed

Information

This model validates the model Buildings.Fluid.DXSystems.Cooling.AirSource.SingleSpeed.

The difference in results of T_Out and X_Out at the beginning and end of the simulation is because the mass flow rate is zero. For zero mass flow rate, EnergyPlus assumes steady state condition, whereas the Modelica model is a dynamic model and hence the properties at the outlet are equal to the state variables of the model.

The EnergyPlus results were generated using the example file DXCoilSystemAuto.idf from EnergyPlus 7.1, with a nominal cooling capacity of 10500 Watts instead of using autosizing. This allowed to have a part load ratio of one.

Note that EnergyPlus mass fractions (X) are in mass of water vapor per mass of dry air, whereas Modelica uses the total mass as a reference. Hence, the EnergyPlus values are corrected by dividing them by 1+X.

Contents

Name	Description
Medium	Medium model

Revisions

• April 5, 2023, by Karthik Devaprasad and Xing Lu:
  Updated model name to differentiate from heating coil validation models.
  Updated connection statements to reflect change in input instance on sinSpeDX from TConIn to TOut.
  Updated formatting for readability.
• January 22, 2016, by Michael Wetter:
  Corrected type declaration of pressure difference. This is for #404.
• December 22, 2014 by Michael Wetter:
  Removed Modelica.Fluid.System to address issue #311.
• September 4, 2012 by Michael Wetter:
  Modified example to avoid having to access protected data.
• August 20, 2012 by Kaustubh Phalak:
  First implementation.