Description
GASPAK (© copyright Cryodata
Inc.) is a
computer program for calculating properties of 33 fluids.
The program uses fundamental state equations which are valid from the
triple point and melting line, through the saturation line and
liquid-vapor mixtures, to high temperature and pressure (the High T and P
limits are different for each fluid and listed in the User's Guide
documentation). Please contact Horizon Technologies for an
evaluation of property calculations at higher temperature and pressure
limits if needed for your application.
New since Version 3.30:
The helium, hydrogen, and nitrogen
property calculations have been extended to higher temperature limits -
helium up to 5000 K.
Molecular disassociation is calculated
for hydrogen and nitrogen. Properties at lower temperature are
unchanged.
Ortho-hydrogen and equilibrium-hydrogen
have been added to the fluids library. These enhancements are from
unpublished work by R. D. McCarty, 1996.
Fugacity is now calculated for all
fluids.
Calculated state properties include:
 |
PVT |
|
Enthalpy |
|
Entropy |
|
Gibbs
and Internal Energy |
|
Specific
Heats |
|
Sound
Velocity |
|
Compressibility |
|
Joule-Thomson
coefficient |
|
Expansivity |
|
Gruneisen
parameter |
|
Latent
Heat |
|
dP/dT
of the saturation line |
|
plus
several other PVT derivatives |
Calculated transport properties include:
|
Viscosity |
|
Thermal
Conductivity |
|
Thermal
Diffusivity |
|
Prandtl
number |
Transport properties data are not available
for all fluids.
A total of 21 different pairs of input
parameters are available for specifying the fluid state. These are
|
single phase
and liquid-vapor mixtures: (P,T), (P,D), (P,H), (P,S), (P,U), (P,X),
(X,T), (S,T), (D,H), (D,S), (D,U), (H,S) |
|
Saturation
line plus one of (P), (T), (D), (S), (H), or (U) |
|
Melting line
plus one of (P), (T), or (D) |
GASPAK was developed by Vincent Arp, Bob McCarty, and Jeff Fox of Cryodata. It has
evolved in concept from the code MIPROPS (now known as NIST-12) written by
Bob McCarty before his retirement from NIST (formerly NBS) and documented
in NBS Technical Note 1097 (1986).
GASPAK differs
fundamentally from NIST-12 in the following key features:
|
Based on a variable-term Helmholtz equation
rather than the 32-term BWR equation, and usable with a wider variety of
published fluid equations.
|
|
Mathematically much more stable for
calculations in the neighborhood of the saturation lines near the
critical and triple points.
|
|
Available with a variety of user-friendly
input-output options, described above.
|
Throughout development of GASPAK, the NIST
standards of scientific quality have been maintained.
Availability
Currently, GASPAK is offered:
As an ActiveX DLL (version 3.41) for
interfacing to a variety of Windows programs. This version is delivered with sample
Visual Basic and C++ code, illustrating how to interface your own
application to the GASPAK properties.
As a DOS executable program with an
Excel97 function-only interface (version 3.31) and a prototype
stand-alone program architecture. Fortran77 source code is
available with this version. The basic DOS program is supplied as
a "stand-alone, keyboard input " version, with options for
input from and output to user-defined files. The code has been tested
and verified to operate in a DOS window in the Windows 3.1,
95/98/2000/NT4/XP operating systems. Only calculational bugs and
DOS interface bugs are being fixed in this version. Bugs in the
Excel97 function access and the prototype stand-alone program are not
being fixed in preference to migrating this entire code to the ActiveX
version.
GASPAK fluid source
|
Fluid
|
Source
|
|
Ammonia
|
VDI
Forschungsheft 596 (1979)
|
|
Argon
|
NBS Tech
Note 1097 (1986)
|
|
Butane,
iso
|
NBS Tech
Note 1097 (1986)
|
|
Butane,
normal
|
NBS Tech
Note 1097 (1986)
|
|
Carbon
dioxide
|
NIST data
(1989)
|
|
Carbon
monoxide
|
J. Phys.
Chem. Ref. Data; NIST (1989)
|
|
Deuterium
|
NBS Tech
Note 1097 (1986)
|
|
Ethane
|
NBS Tech
Note 1097 (1986)
|
|
Ethylene
|
NBS Tech
Note 1045 (1981)
|
|
Ethylene
|
J. Phys.
Chem. Ref. Data (1986)
|
|
Helium (3K
to 5000K)
|
NBS Tech
Note 1334 (1989, 1992); Cryodata 1996
|
|
Hydrogen,
equilibrium
|
R.D.
McCarty, 1996, valid to 5000 K.
|
|
Hydrogen,
normal
|
NBS
Monograph 168 (1975); valid to 5000 K
|
|
Hydrogen,
ortho
|
R.D.
McCarty, 1996, valid to 5000 K.
|
|
Hydrogen,
para
|
NBS Tech
Note 1097; valid to 5000 K (1986)
|
|
Hydrogen
sulfide
|
Colo.
School of Mines (1993)
|
|
Krypton
|
USSR std.
Reference; Cryodata correlation (1990)
|
|
Methane
|
NBS Tech
Note 1097 (1986)
|
|
Methane
|
NIST Tech
Note 1325 (1989)
|
|
Neon
|
USSR std.
Reference; Cryodata correlation (1991)
|
|
Nitrogen
|
NBS Tech
Note 648 (1973)
|
|
Nitrogen
|
J.Phys.Chem.Ref.Data
(1986); valid to 5000 K
|
|
Nitrogen
trifluoride
|
NBSIR
8-1632 (1980); NBS Tech Note 1097 (1986)
|
|
Oxygen
|
NBSIR
78-882 (1978); NBS Tech Note 1097 (1986)
|
|
Oxygen
|
Fluid
Phase Equilibria (1985)
|
|
Propane
|
NBS Tech
Note 1097
|
|
Water
(above 273.16K)
|
J.P.C.R.D,
vol 18, p1537 (1989)
|
|
Xenon
|
USSR std.
Reference; Cryodata correlation (1990)
|
|
Refrigerant
11
|
Univ.
Idaho data (1991)
|
|
Refrigerant
12
|
Univ.
Idaho data (1991)
|
|
Refrigerant
22
|
USSR std.
Reference; Cryodata correlation (1991)
|
|
Refrigerant
32
|
DOE
report; NIST data (1993)
|
|
Refrigerant
123
|
DOE
report; NIST data (1993)
|
|
Refrigerant
124
|
DOE
report; NIST data (1993)
|
|
Refrigerant
125
|
DOE
report; NIST data (1993)
|
|
Refrigerant
134a
|
NIST
(1993)
|
|
Refrigerant
152a
|
XII Int.
Symposium on Thermophysics (1994)
|
Note: fluids which are valid to 5000 K, in
the above list, have been updated by R.D. McCarty in unpublished work,
1996. Only the high temperature properties have changed.
|
