.Buildings.Fluid.DXSystems.Cooling.WaterSource.Validation.VariableSpeedEnergyPlus

Information

This model validates the model Buildings.Fluid.DXSystems.Cooling.WaterSource.VariableSpeed.

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 ZoneVSWSHP_wDOAS.idf from EnergyPlus 7.1, with a nominal cooling capacity of 6758 Watts instead of autosizing and an internal gain from electric equipment as 9400 Watts. This allowed to have a speed 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
MediumAir
MediumWater

Revisions

• February 16, 2017 by Yangyang Fu:
  First implementation.