Modelica.Thermal.FluidHeatFlow.Sources

Ideal fluid sources, e.g., ambient, volume flow

Information

This package contains different types of sources:

Ambient with constant or prescribed pressure and temperature
AbsolutePressure to define pressure level of a closed cooling cycle.
Constant and prescribed volume flow
Constant and prescribed pressure increase
Simple pump with mechanical flange

Thermodynamic equations are defined in partial models (package Interfaces.Partials).
All fans / pumps are considered without losses, they do not change enthalpy flow.

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.SourcesPackage (Icon for packages containing sources).

Package Content

Name	Description
Ambient	Ambient with constant properties
AbsolutePressure	Defines absolute pressure level
VolumeFlow	Enforces constant volume flow
PressureIncrease	Enforces constant pressure increase
IdealPump	Model of an ideal pump

Modelica.Thermal.FluidHeatFlow.Sources.Ambient

Ambient with constant properties

Information

(Infinite) ambient with constant pressure and temperature.
Thermodynamic equations are defined by Partials.Ambient.

Extends from Interfaces.Partials.Ambient (Partial model of ambient).

Parameters

Name Description

medium Ambient medium

usePressureInput Enable / disable pressure input

constantAmbientPressure Ambient pressure [Pa]

useTemperatureInput Enable / disable temperature input

constantAmbientTemperature Ambient temperature [K]

Name	Description
medium	Ambient medium
usePressureInput	Enable / disable pressure input
constantAmbientPressure	Ambient pressure [Pa]
useTemperatureInput	Enable / disable temperature input
constantAmbientTemperature	Ambient temperature [K]

Connectors

Name Description

flowPort

ambientPressure

ambientTemperature

Name	Description
flowPort
ambientPressure
ambientTemperature

Modelica.Thermal.FluidHeatFlow.Sources.AbsolutePressure

Defines absolute pressure level

Information

AbsolutePressure to define pressure level of a closed cooling cycle. Coolant's mass flow, temperature and enthalpy flow are not affected.

Parameters

Name Description

medium medium

p Pressure ground [Pa]

Name	Description
medium	medium
p	Pressure ground [Pa]

Connectors

Name Description

flowPort

Name	Description
flowPort

Modelica.Thermal.FluidHeatFlow.Sources.VolumeFlow

Enforces constant volume flow

Information

Fan resp. pump with constant volume flow rate. Pressure increase is the response of the whole system. Coolant's temperature and enthalpy flow are not affected.
Setting parameter m (mass of medium within fan/pump) to zero leads to neglection of temperature transient cv*m*der(T).
Thermodynamic equations are defined by Partials.TwoPort.

Extends from Interfaces.Partials.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

useVolumeFlowInput Enable / disable volume flow input

constantVolumeFlow Volume flow rate [m3/s]

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
useVolumeFlowInput	Enable / disable volume flow input
constantVolumeFlow	Volume flow rate [m3/s]

Connectors

Name Description

flowPort_a

flowPort_b

volumeFlow

Name	Description
flowPort_a
flowPort_b
volumeFlow

Modelica.Thermal.FluidHeatFlow.Sources.PressureIncrease

Enforces constant pressure increase

Information

Fan resp. pump with constant pressure increase. Mass resp. volume flow is the response of the whole system. Coolant's temperature and enthalpy flow are not affected.
Setting parameter m (mass of medium within fan/pump) to zero leads to neglection of temperature transient cv*m*der(T).
Thermodynamic equations are defined by Partials.TwoPort.

Extends from Interfaces.Partials.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

usePressureIncreaseInput Enable / disable pressure increase input

constantPressureIncrease Pressure increase [Pa]

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
usePressureIncreaseInput	Enable / disable pressure increase input
constantPressureIncrease	Pressure increase [Pa]

Connectors

Name Description

flowPort_a

flowPort_b

pressureIncrease

Name	Description
flowPort_a
flowPort_b
pressureIncrease

Modelica.Thermal.FluidHeatFlow.Sources.IdealPump

Model of an ideal pump

Information

Simple fan resp. pump where characteristic is dependent on shaft's speed,
torque * speed = pressure increase * volume flow (without losses)
Pressure increase versus volume flow is defined by a linear function, from dp0(V_flow=0) to V_flow0(dp=0).
The axis intersections vary with speed as follows:

dp prop. speed^2
V_flow prop. speed

Coolant's temperature and enthalpy flow are not affected.
Setting parameter m (mass of medium within fan/pump) to zero leads to neglection of temperature transient cv*m*der(T).
Thermodynamic equations are defined by Partials.TwoPort.

Extends from Interfaces.Partials.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

Pump characteristic

wNominal Nominal speed [rad/s]

dp0 Max. pressure increase @ V_flow=0 [Pa]

V_flow0 Max. volume flow rate @ dp=0 [m3/s]

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
Pump characteristic
wNominal	Nominal speed [rad/s]
dp0	Max. pressure increase @ V_flow=0 [Pa]
V_flow0	Max. volume flow rate @ dp=0 [m3/s]

Connectors

Name Description

flowPort_a

flowPort_b

flange_a

Name	Description
flowPort_a
flowPort_b
flange_a

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