Internal units of measure
- Last UpdatedAug 13, 2024
- 2 minute read
AVEVA Process Simulation carries out all calculations in terms of the internal units of measure (UOMs). You should take this into consideration when you add equations to a Model Type or add a flowsheet equation to a simulation. If your equations include any coefficients that include UOM conversion factors or that are specific to a UOM, you should convert those coefficients to the internal UOMs.
The following table lists the internal UOMs by category.
|
Variable Type |
Internal UOM |
|---|---|
|
Controls |
|
|
Signal |
fraction |
|
Currency |
|
|
Currency |
¤ |
|
Currency / Area |
¤/m2 |
|
Currency / Energy |
¤/kWs |
|
Currency / Mass |
¤/kg |
|
Currency / Time |
¤/s |
|
Currency / Volume |
¤/m3 |
|
Dimensionless |
|
|
Dimensionless |
- |
|
Fraction |
fraction |
|
Ratio |
- |
|
Real |
- |
|
Electrical |
|
|
Apparent Power |
kVA |
|
Capacitance |
F |
|
Current |
A |
|
Current Density |
A/m2 |
|
Electrical Charge |
C |
|
Electrical Conductance |
S |
|
Electrical Energy |
kJ |
|
Electrical Power |
kW |
|
Electrical Resistivity |
kΩ-m |
|
Frequency |
Hz |
|
Inductance |
H |
|
Inverse Capacitance |
1/F |
|
Inverse Electrical Charge |
1/C |
|
Irradiance |
kW/m2 |
|
Resistance |
kΩ |
|
Temp Coefficient |
fraction/K |
|
Voltage |
kV |
|
Emissions |
|
|
Emission / Energy |
kg/kJ |
|
Emission / Mass |
kg/kg |
|
Emission / Volume |
kg/m3 |
|
Emission Rate |
kg/s |
|
Equipment Sizing |
|
|
Diameter |
m |
|
Elevation |
m |
|
Length |
m |
|
Location |
m |
|
Pipe Diameter |
m |
|
Thermal Expansion |
mm/mm/C |
|
Thickness |
mm |
|
Flow Rates |
|
|
Heat Flow |
kJ/s |
|
Liquid Vol Flow |
m3/s |
|
Mass Flow |
kg/s |
|
Mole Flow |
kmol/s |
|
Std Liquid Vol Flow |
m3/s |
|
Std Vapor Vol Flow |
kmol/s |
|
Vapor Vol Flow |
m3/s |
|
Vol Flow |
m3/s |
|
Heat Transfer |
|
|
Heat Conductance |
kW/K |
|
Heat Duty |
kJ/s |
|
Heat Flux Density |
kW/m2 |
|
Heat Transfer Coefficient |
kW/m2-K |
|
Heat Transfer Resistance |
m2-K/kW |
|
Surface Area |
m2 |
|
Temperature Difference |
K |
|
Holdup |
|
|
Energy |
kJ |
|
Mass |
kg |
|
Metal Mass |
kg |
|
Moles |
kmol |
|
Volume |
m3 |
|
Hydraulics |
|
|
API Relief Valve Coefficient |
SI |
|
Compressibility |
1/kPa |
|
Cross Sectional Area |
m2 |
|
Diff Pressure |
kPa |
|
Elastic Modulus |
kPa |
|
F-Factor |
√Pa |
|
Flow Coefficient |
Cv |
|
Flow Conductance |
(kg/s)/sqrt(kPa-kg/m3) |
|
Gas Head |
kJ/kg |
|
Joule Thomson Coefficient |
K/kPa |
|
Liquid Head |
m |
|
Packing Pressure Drop |
mbar/m |
|
Piping Head Loss |
kPa/m |
|
Velocity |
m/s |
|
Mass Fluid Properties |
|
|
Mass Composition |
mass fraction |
|
Mass Concentration |
kg/m3 |
|
Mass Density |
kg/m3 |
|
Mass Enthalpy |
kJ/kg |
|
Mass Entropy |
kJ/kg-K |
|
Specific Gravity |
- |
|
Specific Heat |
kJ/kg-K |
|
Mass Transfer |
|
|
Diffusivity |
m2/s |
|
Inverted Mass Transfer Coefficient |
s/m |
|
Mass Flux |
kg/m2-s |
|
Mass Transfer Coefficient |
m/s |
|
Molar Flux |
kmol/m2-s |
|
Specific Length |
m/m2 |
|
Specific Surface |
m2/m3 |
|
Mechanical |
|
|
Acceleration |
m/s2 |
|
Angle |
rad |
|
Heat Rate |
kJ/kJ |
|
Mechanical Power |
kW |
|
Rotational Inertia |
kg-m2 |
|
Sound |
dB |
|
Speed |
rpm |
|
Torque |
N-m |
|
Molar Fluid Properties |
|
|
Molality |
kmol/kg |
|
Molar Composition |
mole fraction |
|
Molar Concentration |
kmol/m3 |
|
Molar Density |
kmol/m3 |
|
Molar Enthalpy |
kJ/kmol |
|
Molar Entropy |
kJ/kmol-K |
|
Molar Heat Capacity |
kJ/kmol-K |
|
Molar Volume |
m3/kmol |
|
Molar Weight |
kg/kmol |
|
Pressure and Temperature |
|
|
Pressure |
kPa |
|
Temperature |
K |
|
Reaction Kinetics |
|
|
Reaction Rate per Volume |
kmol/s-m3 |
|
Reaction Rate per Unit Feed |
kmol/kmol |
|
Reaction Rate per Weight |
kmol/s-kg |
|
Time |
|
|
Inverse Time |
1/s |
|
Time |
s |
|
Transport Properties |
|
|
Electrical Conductivity |
S/m |
|
Kinematic Viscosity |
m2/s |
|
Surface Tension |
N/m |
|
Thermal Conductivity |
W/m-K |
|
Viscosity |
Pa-s |
|
Volume Fluid Properties |
|
|
Gas Oil Ratio |
m3/m3 |
|
Standard Liquid Density |
kg/m3 |
|
Vol Composition |
fraction |
|
Vol Enthalpy |
kJ/m3 |