.Buildings.Fluid.BaseClasses.FlowModels.basicFlowFunction_m_flow_der

Information

Function that implements the first order derivative of Buildings.Fluid.BaseClasses.FlowModels.basicFlowFunction_m_flow, assuming a constant flow coefficient.

When called with m_flow_der=der(m_flow), this function returns the time derivative of dp. When called with m_flow_der=1, this function returns the derivative of dp with respect to m_flow.

Interface

function basicFlowFunction_m_flow_der
  extends Modelica.Icons.Function;
  input Modelica.Units.SI.MassFlowRate m_flow "Mass flow rate in design flow direction";
  input Real k(unit = "") "Flow coefficient, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2)";
  input Modelica.Units.SI.MassFlowRate m_flow_turbulent(min = 0) "Mass flow rate where transition to turbulent flow occurs";
  input Real m_flow_der "Derivative of mass flow rate in design flow direction";
  output Real dp_der "Derivative of pressure difference between port_a and port_b (= port_a.p - port_b.p)";
end basicFlowFunction_m_flow_der;

Revisions

• January 4, 2019, by Michael Wetter:
  Set `Inline=false`.
  See #1070.
• May 1, 2017, by Filip Jorissen:
  Revised implementation such that Buildings.Fluid.BaseClasses.FlowModels.basicFlowFunction_m_flow is C2 continuous. See #725.
• July 29, 2015, by Michael Wetter:
  First implementation to avoid in Dymola 2016 the warning "Differentiating ... under the assumption that it is continuous at switching".