Modelica.Thermal.FluidHeatFlow.Components

Basic components (pipes, valves)

Information

This package contains components:

pipe without heat exchange
pipe with heat exchange
valve (simple controlled valve)

Pressure drop is taken from partial model SimpleFriction. Thermodynamic equations are defined in partial models (package Partials).

Extends from Modelica.Icons.Package (Icon for standard packages).

Package Content

Name	Description
IsolatedPipe	Pipe without heat exchange
HeatedPipe	Pipe with heat exchange
Valve	Simple valve

Modelica.Thermal.FluidHeatFlow.Components.IsolatedPipe

Pipe without heat exchange

Information

Pipe without heat exchange.
Thermodynamic equations are defined by Partials.TwoPortMass(Q_flow = 0).
Note: Setting parameter m (mass of medium within pipe) to zero leads to neglection of temperature transient cv*m*der(T).

Extends from Interfaces.Partials.TwoPort (Partial model of two port), Interfaces.Partials.SimpleFriction (Simple friction model).

Parameters

Name	Description
medium	Medium in the component
m	Mass of medium [kg]
T0	Initial temperature of medium [K]
T0fixed	Initial temperature guess value or fixed
tapT	Defines temperature of heatPort between inlet and outlet temperature
h_g	Geodetic height (height difference from flowPort_a to flowPort_b) [m]
Simple Friction
V_flowLaminar	Laminar volume flow [m3/s]
dpLaminar	Laminar pressure drop [Pa]
V_flowNominal	Nominal volume flow [m3/s]
dpNominal	Nominal pressure drop [Pa]
frictionLoss	Part of friction losses fed to medium

Connectors

Name	Description
flowPort_a
flowPort_b

Modelica.Thermal.FluidHeatFlow.Components.HeatedPipe

Pipe with heat exchange

Information

Pipe with heat exchange.
Thermodynamic equations are defined by Partials.TwoPort.
Q_flow is defined by heatPort.Q_flow.
Note: Setting parameter m (mass of medium within pipe) to zero leads to neglection of temperature transient cv*m*der(T).
Note: Injecting heat into a pipe with zero mass flow causes temperature rise defined by storing heat in medium's mass.

Extends from Interfaces.Partials.TwoPort (Partial model of two port), Interfaces.Partials.SimpleFriction (Simple friction model).

Parameters

Name	Description
medium	Medium in the component
m	Mass of medium [kg]
T0	Initial temperature of medium [K]
T0fixed	Initial temperature guess value or fixed
tapT	Defines temperature of heatPort between inlet and outlet temperature
h_g	Geodetic height (height difference from flowPort_a to flowPort_b) [m]
Simple Friction
V_flowLaminar	Laminar volume flow [m3/s]
dpLaminar	Laminar pressure drop [Pa]
V_flowNominal	Nominal volume flow [m3/s]
dpNominal	Nominal pressure drop [Pa]
frictionLoss	Part of friction losses fed to medium

Connectors

Name	Description
flowPort_a
flowPort_b
heatPort

Modelica.Thermal.FluidHeatFlow.Components.Valve

Simple valve

Information

Simple controlled valve.

Standard characteristic Kv=f (y) is given at standard conditions (dp0, rho0),

either linear : Kv/Kv1 = Kv0/Kv1 + (1-Kv0/Kv1) * y/Y1
or exponential: Kv/Kv1 = Kv0/Kv1 * exp[log(Kv1/Kv0) * y/Y1]

where:

Kv0 ... min. flow @ y = 0
Y1 .... max. valve opening
Kv1 ... max. flow @ y = Y1

Flow resistance under real conditions is calculated by

V_flow**2 * rho / dp = Kv(y)**2 * rho0 / dp0

Extends from Interfaces.Partials.TwoPort (Partial model of two port).

Parameters

Name	Description
medium	Medium in the component
T0	Initial temperature of medium [K]
T0fixed	Initial temperature guess value or fixed
tapT	Defines temperature of heatPort between inlet and outlet temperature
frictionLoss	Part of friction losses fed to medium
Standard characteristic
LinearCharacteristic	Type of characteristic
y1	Max. valve opening
Kv1	Max. flow @ y = y1 [m3/s]
kv0	Leakage flow / max.flow @ y = 0
dp0	Standard pressure drop [Pa]
rho0	Standard medium's density [kg/m3]

Connectors

Name	Description
flowPort_a
flowPort_b
y

Automatically generated Tue Apr 05 09:37:03 2016.