blockCtrThrottle

Controller for unmixed circuit with valve

Information

Simple controller for Throttle and ThrottlePump circuit that is based on a PID controller. The controlled variable needs to be connected to Tact.

If the valve is fully closed, the pump will switch off. The pump frequency is constant, if pump is on

Type	Name	Default	Description
Boolean	useExternalTset	false	If True, set temperature can be given externally
Modelica.Units.SI.Temperature	TflowSet	289.15	Flow temperature set point of consumer
Real	k	0.025	Gain of controller
Modelica.Units.SI.Time	Ti	130	Time constant of Integrator block
Modelica.Units.SI.Time	Td	4	Time constant of Derivative block
Modelica.Units.NonSI.AngularVelocity_rpm	rpm_pump	2000	Rpm of the Pump
Boolean	reverseAction	true	Set to true if heating system, and false for cooling system
PID
Modelica.Blocks.Types.Init	initType	.Modelica.Blocks.Types.Init.InitialState	Type of initialization (1: no init, 2: steady state, 3: initial state, 4: initial output)
Real	xi_start	0	Initial or guess value value for integrator output (= integrator state)
Real	xd_start	0	Initial or guess value for state of derivative block
Real	y_start	0	Initial value of output

Type	Name	Description
Modelica.Blocks.Interfaces.RealInput	Tact	Connector of measurement input signal
Modelica.Blocks.Interfaces.RealInput	Tset	Connector of second Real input signal
Modelica.Blocks.Sources.Constant	constTflowSet
AixLib.Controls.Continuous.LimPID	PID
Modelica.Blocks.Sources.Constant	constRpmPump
Modelica.Blocks.Logical.GreaterThreshold	pumpSwitchOff
BaseClasses.HydraulicBus	hydraulicBus