Correlation 20
- Last UpdatedMar 07, 2023
- 2 minute read
The following table lists the identification numbers of this correlation with respect to some well-known sources of thermodynamic data.
|
Source |
Correlation Number |
|---|---|
|
SimSci |
20 |
|
PPDS |
- |
|
DIPPR 801 |
101, 115 |
|
NIST TDE |
1, 2, 3, 4, 18 |
|
DECHEMA IK-CAPE PPDX |
KIRC: Kirchhoff equation KIR1: extended Kirchhoff equation |
The equation has the following form:
You must use at least 2 coefficients with this correlation.
While this correlation shows the calculation for the natural logarithm (ln) of the temperature-dependent property, the software calculates either the natural logarithm or the logarithm base 10 (log) of the temperature-dependent property based on your Log Basis selection in AVEVA Thermodynamic Data Manager (TDM). The default logarithm basis is the natural logarithm.
You can use up to 10 coefficients with this correlation.
The input temperature must be in absolute units (K or R).
If you want to use the NIST TDE 1 equation, set the C5 coefficient to 1 and the C6 and C8 coefficients to zero.
If you want to use the NIST TDE 3 equation, set the C4, C6, C7, and C9 coefficients to zero.
If you want to use the NIST TDE 4 equation or the DIPPR 801 115 equation, set the C5 coefficient to 1 and the C6, C7, C9, and C10 coefficients to zero.
If you want to use the IK-CAPE KIRC equation, set the C2 coefficient to the -a1 coefficient in the KIRC equation and the C4, C6, C7, C8,C9, and C10 coefficients to zero.
If you want to use the IK-CAPE KIR1 equation, set the C6, C7, C8,C9, and C10 coefficients to zero.
Usage
We recommend that you use this correlation to calculate only the following properties:
-
Liquid Viscosity
-
Vapor Pressure
References
-
Thermodynamics-Package for CAPE-Applications. DECHEMA e.V. [Online] March 28, 2002, pp 7-10. http://dechema.de/dechema_media/IK_CAPE_Equations-p-888.pdf (accessed May 1, 2018).