Modelica.Thermal.FluidHeatFlow.Interfaces.Partials

Partial models

Information

This package contains partial models, defining in a very compact way the basic thermodynamic equations used by the different components.

Main Authors:

Anton Haumer
Technical Consulting & Electrical Engineering
A-3423 St.Andrae-Woerdern, Austria
email: a.haumer@haumer.at

Dr. Christian Kral
Austrian Institute of Technology, AIT
Giefinggasse 2
A-1210 Vienna, Austria

This Modelica package is free software and the use is completely at your own risk; it can be redistributed and/or modified under the terms of the Modelica License 2. For license conditions (including the disclaimer of warranty) see Modelica.UsersGuide.ModelicaLicense2 or visit https://www.modelica.org/licenses/ModelicaLicense2.

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

Package Content

Name	Description
SimpleFriction	Simple friction model
TwoPort	Partial model of two port
Ambient	Partial model of ambient
AbsoluteSensor	Partial model of absolute sensor
RelativeSensor	Partial model of relative sensor
FlowSensor	Partial model of flow sensor

Modelica.Thermal.FluidHeatFlow.Interfaces.Partials.SimpleFriction

Simple friction model

Information

Definition of relationship between pressure drop and volume flow rate:
-V_flowLaminar < VolumeFlow < +V_flowLaminar: laminar i.e., linear dependency of pressure drop on volume flow.
-V_flowLaminar > VolumeFlow or VolumeFlow < +V_flowLaminar: turbulent i.e., quadratic dependency of pressure drop on volume flow.
Linear and quadratic dependency are coupled smoothly at V_flowLaminar / dpLaminar.
Quadratic dependency is defined by nominal volume flow and pressure drop (V_flowNominal / dpNominal).
See also sketch at diagram layer.

Parameters

Name Description

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

Name	Description
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

Modelica.Thermal.FluidHeatFlow.Interfaces.Partials.TwoPort

Partial model of two port

Information

Partial model with two flowPorts.
Possible heat exchange with the ambient is defined by Q_flow; setting this = 0 means no energy exchange.
Setting parameter m (mass of medium within pipe) to zero leads to neglection of temperature transient cv*m*der(T).
Mixing rule is applied.
Parameter 0 < tapT < 1 defines temperature of heatPort between medium's inlet and outlet temperature.

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

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

Connectors

Name Description

flowPort_a

flowPort_b

Name	Description
flowPort_a
flowPort_b

Modelica.Thermal.FluidHeatFlow.Interfaces.Partials.Ambient

Partial model of ambient

Information

Partial model of (Infinite) ambient, defines pressure and temperature.

Parameters

Name Description

medium Ambient medium

Name	Description
medium	Ambient medium

Connectors

Name Description

flowPort

Name	Description
flowPort

Modelica.Thermal.FluidHeatFlow.Interfaces.Partials.AbsoluteSensor

Partial model of absolute sensor

Information

Partial model for an absolute sensor (pressure/temperature).
Pressure, mass flow, temperature and enthalpy flow of medium are not affected.

Extends from Modelica.Icons.RotationalSensor (Icon representing a round measurement device).

Parameters

Name Description

medium Sensor's medium

Name	Description
medium	Sensor's medium

Connectors

Name Description

flowPort

y

Name	Description
flowPort
y

Modelica.Thermal.FluidHeatFlow.Interfaces.Partials.RelativeSensor

Partial model of relative sensor

Information

Partial model for a relative sensor (pressure drop/temperature difference).
Pressure, mass flow, temperature and enthalpy flow of medium are not affected.

Extends from Modelica.Icons.RotationalSensor (Icon representing a round measurement device).

Parameters

Name Description

medium Sensor's medium

Name	Description
medium	Sensor's medium

Connectors

Name Description

flowPort_a

flowPort_b

y

Name	Description
flowPort_a
flowPort_b
y

Modelica.Thermal.FluidHeatFlow.Interfaces.Partials.FlowSensor

Partial model of flow sensor

Information

Partial model for a flow sensor (mass flow/heat flow).
Pressure, mass flow, temperature and enthalpy flow of medium are not affected, but mixing rule is applied.

Extends from Modelica.Icons.RotationalSensor (Icon representing a round measurement device), TwoPort (Partial model of two port).

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

Connectors

Name Description

flowPort_a

flowPort_b

y

Name	Description
flowPort_a
flowPort_b
y

Automatically generated Mon Sep 23 17:21:09 2013.