.FCSys.Quantities

Information

In FCSys, the unit attribute of each Real variable actually denotes the dimension.1 The fundamental dimensions are angle (A), length (L), mass (M), particle number (N), and time (T). These are combined according to the rules established for unit strings [Modelica2010, p. 210]. Temperature and charge are derived dimensions (see the Units package).

The quantity attribute is not used since the type is the quantity. The displayUnit attribute is only used for quantities that imply a certain display unit.

Methods for unit checking have been established [Mattsson2008, Broman2008, Aronsson2009] and can, in theory, be applied to dimension checking instead.

The Quantities package is abbreviated as Q throughout the rest of FCSys.

The quantities are generally named with adjectives following the noun so that the quantities are grouped when alphabetized. Some quantities are aliases to other quantities but with special implied display units. For example, Temperature is an alias for Potential with a default display unit of K. ootnote{Temperature is a potential in the chosen system of units; see the next section ( ef{sec:Units}).} Also, some quantities have minimum values (e.g., zero for PressureAbsolute). For more information, please see the documentation of the Units package.

1. This misnomer is necessary because Real variables do not have a dimension attribute.

Licensed by the Hawaii Natural Energy Institute under the Modelica License 2
Copyright © 2007–2014, Hawaii Natural Energy Institute and Georgia Tech Research Corporation.

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 FCSys.UsersGuide.License or visit http://www.modelica.org/licenses/ModelicaLicense2.

Contents

NameDescription
ExamplesExamples
Acceleration
Amount
AmountReciprocalReciprocal of amount
Angle
Angle2Solid angle
Area
AreaSpecificSpecific area
Capacitance
Density
DensityRateRate of density
ConductanceElectricalElectrical conductance
ConductivityElectricalElectrical conductivity
Continuity
Current
CurrentAreicAreic current
CurrentAreicAbsoluteAbsolute areic current
CurrentRateRate of current
Diffusivity
Energy
Fluidity
Force
ForceSpecificSpecific force
Frequency
Inductance
Length
LengthReciprocalReciprocal of length
LengthSpecificSpecific length
MagneticFluxMagnetic flux
MagneticFluxAreicAreic magnetic flux
MagneticFluxReciprocalReciprocal of magnetic flux
Mass
MassSpecificSpecific mass
MassVolumicVolumic mass
Mobility
MomentumRotationalRotational momentum
Number
NumberAbsoluteAbsolute number
Permeability
Permittivity
PermittivityReciprocalReciprocal of permittivity
Potential
PotentialAbsoluteAbsolute potential
PotentialPerWavenumberPotential per wavenumber
PotentialRateRate of potential
Power
PowerAreaPower times area
PowerAreicAreic power
PowerAreicPerPotential4Areic power per 4th power of potential
PowerRadiantRadiant power
Pressure
PressureAbsoluteAbsolute pressure
PressureRateRate of pressure
PressureReciprocalReciprocal of pressure
ResistanceElectricalElectrical resistance
ResistanceThermalThermal resistance
SurfaceTensionSurface tension
Resistivity
Time
TimeAbsoluteAbsolute time
TimeLineicLineic time
Velocity
Velocity2Squared velocity
VelocityAmount
Volume
VolumeRateRate of volume
VolumeSpecificSpecific volume
VolumeSpecificAbsoluteAbsolute specific volume
VolumeSpecificRateRate of specific volume
Wavenumber
CapacityThermalThermal capacity
CapacityThermalSpecificSpecific thermal capacity
CapacityThermalVolumicVolumic thermal capacity
PotentialChemicalChemical potential
Temperature
TemperatureAbsoluteAbsolute temperature
TemperatureRateRate of temperature
ResistivityThermalThermal resistivity
ConductanceConductance

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