recordFourPortResistanceChillerWSE

Flow resistance model for the chiller and WSE package

Information

This class contains parameters that are used to compute the pressure drop in the Buildings.Applications.DataCenters.ChillerCooled package.

Parameters

TypeNameDefaultDescription
Flow resistance › Medium 1
BooleancomputeFlowResistance1true=true, compute flow resistance. Set to false to assume no friction
Booleanfrom_dp1false= true, use m_flow = f(dp) else dp = f(m_flow)
Realn12Flow exponent, n1=1 for laminar, n1=2 for turbulent
BooleanlinearizeFlowResistance1false= true, use linear relation between m_flow and dp for any flow rate
RealdeltaM10.1Fraction of nominal flow rate where flow transitions to laminar
Chiller
Modelica.Units.SI.PressureDifferencedp1_chi_nominalPressure difference on medium 1 side in the chillers
Modelica.Units.SI.PressureDifferencedp2_chi_nominalPressure difference on medium 2 side in the chillers
Waterside economizer
Modelica.Units.SI.PressureDifferencedp1_wse_nominalPressure difference on medium 1 side in the waterside economizer
Modelica.Units.SI.PressureDifferencedp2_wse_nominalPressure difference on medium 2 side in the waterside economizer
Flow resistance › Medium 2
BooleancomputeFlowResistance2true=true, compute flow resistance. Set to false to assume no friction
Booleanfrom_dp2false= true, use m_flow = f(dp) else dp = f(m_flow)
Realn22Flow exponent, n2=1 for laminar, n2=2 for turbulent
BooleanlinearizeFlowResistance2false= true, use linear relation between m_flow and dp for any flow rate
RealdeltaM20.1Fraction of nominal flow rate where flow transitions to laminar

Revisions

  • June 17, 2026, by Michael Wetter:
    Updated implementation to allow a flow coefficient n that is different from 2. This allows use of the model for not fully turbulent flow.
    This is for Buildings, #4620.
  • June 30, 2017, by Yangyang Fu:
    First implementation.