functionder_equalPercentage
Derivative of valve opening characteristics for equal percentage valve
Extends from Modelica.Icons.Function (Icon for functions).
Information
This function computes the derivative of the opening characteristics of an equal percentage valve.
The function is the derivative of Buildings.Fluid.Actuators.BaseClasses.equalPercentage.
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| Real | y | Valve opening signal, y=1 is fully open | |
| Real | R | Rangeability, R=50...100 typically | |
| Real | l | Valve leakage, l=Kv(y=0)/Kv(y=1) | |
| Real | delta | Range of significant deviation from equal percentage law | |
| Real | der_y | Derivative of valve opening signal |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| Real | der_phi | Derivative of ratio actual to nominal mass flow rate, dphi/dy |
Revisions
-
March 30, 2011 by Michael Wetter:
Removed inputs for which no derivative is implemented from the argument list, and addedzeroDerivativekeyword in function that calls this function. -
February 4, 2010 by Michael Wetter:
Fixed implementation of derivative function. -
June 6, 2008 by Michael Wetter:
First implementation.