Buildings.Fluid.BaseClasses.FlowModels.Examples

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Buildings.Fluid.BaseClasses.FlowModels.Examples

Collection of models that illustrate model use and test models

Information

This package contains examples for the use of models that can be found in Buildings.Fluid.BaseClasses.FlowModels.

Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).

Package Content

Name Description

InverseFlowFunction Test model for flow function and its inverse

TestFlowFunctions Test model for flow functions

Name	Description
InverseFlowFunction	Test model for flow function and its inverse
TestFlowFunctions	Test model for flow functions

Buildings.Fluid.BaseClasses.FlowModels.Examples.InverseFlowFunction

Test model for flow function and its inverse

Information

This model test the inverse formulation of the flow functions. The pressure difference dp and dpCalc need to be equal up to the solver tolerance.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Type Name Default Description

Real k 0.5

MassFlowRate m_flow_nominal 1 Nominal flow rate [kg/s]

Type	Name	Default	Description
Real	k	0.5
MassFlowRate	m_flow_nominal	1	Nominal flow rate [kg/s]

Modelica definition

model InverseFlowFunction 
  "Test model for flow function and its inverse"
  extends Modelica.Icons.Example;
 Modelica.SIunits.MassFlowRate m_flow;
 Modelica.SIunits.Pressure dp(displayUnit="Pa") "Pressure difference";
 Modelica.SIunits.Pressure dpCalc(displayUnit="Pa") 
    "Pressure difference computed by the flow functions";
 Modelica.SIunits.Pressure deltaDp(displayUnit="Pa") 
    "Pressure difference between input and output to the functions";
 Modelica.SIunits.Time dTime= 2;
 parameter Real k = 0.5;
 parameter Modelica.SIunits.MassFlowRate m_flow_nominal = 1 "Nominal flow rate";
equation 
  dp = (time-0.5)/dTime * 20;
  m_flow=FlowModels.basicFlowFunction_dp(dp=dp, k=k, m_flow_turbulent=m_flow_nominal*0.3);
  dpCalc=FlowModels.basicFlowFunction_m_flow(m_flow=m_flow, k=k, m_flow_turbulent=m_flow_nominal*0.3);
  deltaDp = dp - dpCalc;
end InverseFlowFunction;

Buildings.Fluid.BaseClasses.FlowModels.Examples.TestFlowFunctions

Test model for flow functions

Information

This model test the inverse functions. When translating this model in Dymola 7.2, there should be no numerical solution be required to solve the nonlinear equation system.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Type Name Default Description

Pressure p2 101325 Boundary condition [Pa]

Boolean from_dp true

Real k 0.5

MassFlowRate m_flow_nominal 1 Nominal flow rate [kg/s]

Type	Name	Default	Description
Pressure	p2	101325	Boundary condition [Pa]
Boolean	from_dp	true
Real	k	0.5
MassFlowRate	m_flow_nominal	1	Nominal flow rate [kg/s]

Modelica definition

model TestFlowFunctions "Test model for flow functions"
  extends Modelica.Icons.Example;
 Modelica.SIunits.MassFlowRate m1_flow;
 Modelica.SIunits.MassFlowRate m2_flow;
 Modelica.SIunits.Pressure dp1;
 Modelica.SIunits.Pressure dp2;
 Modelica.SIunits.Pressure p1_nominal=101325;
 Modelica.SIunits.Time dTime= 1;
 Modelica.SIunits.Pressure p1 "Boundary condition";
 parameter Modelica.SIunits.Pressure p2 = 101325 "Boundary condition";
 parameter Boolean from_dp = true;
 parameter Real k = 0.5;
 parameter Modelica.SIunits.MassFlowRate m_flow_nominal = 1 "Nominal flow rate";
equation 
  p1 = p1_nominal + (time-0.5)/dTime * 20;
  m1_flow = m2_flow;
  p2-p1 = dp1 + dp2;
  if from_dp then
  m1_flow=FlowModels.basicFlowFunction_dp(dp=dp1, k=k, m_flow_turbulent=m_flow_nominal*0.3);
  m2_flow=FlowModels.basicFlowFunction_dp(dp=dp2, k=k, m_flow_turbulent=m_flow_nominal*0.3);
  else
  dp1=FlowModels.basicFlowFunction_m_flow(m_flow=m1_flow, k=k, m_flow_turbulent=m_flow_nominal*0.3);
  dp2=FlowModels.basicFlowFunction_m_flow(m_flow=m2_flow, k=k, m_flow_turbulent=m_flow_nominal*0.3);
  end if;
  assert(abs(dp1-dp2) < 1E-5, "Error in implementation.");
end TestFlowFunctions;

Automatically generated Thu Jul 26 10:21:43 2012.