STEAM93/PC calculates 30 thermodynamic state and transport prop-
erties of properties of water, steam, and mixtures.  The properties 
include state properties like pressure, entropy, and Hemholtz function
 and transport properties like viscosity and heat transfer coefficients.  
The program is very easy to use.  Only two-consistent state inputs
 are needed to resolve all properties.  A spread-sheet metaphor for
 input and output is used.

STEAM93/PC uses the most physically accurate methods available
 and uses no interpolations, look-up tables, or approximations.  
The IAPS'84 formulations, with physical accuracy 100 to 10,000 
times more accurate than prior formulations are used exclusively.  
These formulations are also more stable in the critical region.  
STEAM93 also uses Gibbs condition for resolving saturation c
onditions rather than a separate correlation.  Other state properties 
are taken from their thermodynamic definition or an approved 
IAPS formulation.

STEAMDOS.EXE is a self-extract compressed file: just type in STEAMDOS 
and it will expand itself.  The files include:
	STEAMAN.TXT		Complete manual in ASCII
	STEAM93s.EXE		STEAM93 program
	DUMMY.*		Example files
	REGISTGER.*		Registration information

This program has had 10 years of commercial service.  It is fully 
verified with source references to the limits of the published data.  
The verification and validation documentation is available separately.  

About the authors ...

IMPULSE Engineering was founded in 1984 with the vision to bring 
the works of science and engineering to mankind.  In that effort. we 
have developed a range of software and engineering services in fluid 
mechanics, thermodynamics, computer science, and nuclear safety with 
applications to aerospace, atmospheric sciences, marine studies, nuclear 
power, software development, and oil and gas pipelines.  Our clients 
include:
	IBM, 
	Microsoft, 
	the National Aeronautics and Space Administration (NASA), 
	the National Oceanographic and Atmospheric Administration 
	   (NOAA)., 
	the National Institutes of Health (NIH)
and  numerous universities, utilities, and oil companies.

The author of STEAM93, B. R. Strong, Jr., is a registered professional 
engineer with 25 years of practice in mechanical engineering.

-\{-\0
Current release 

	   STEAM'93 v3.2

This new release has greatly enhanced consistency especially 
near the critical point.  This is very region to resolve and 
much work was required.  Transport properties in the two-phase 
region are also accelerated.  Also, the copy facility has been 
improved (F1/F2).

 \1NOTES

Natural Convection Heat Transfer Coefficient
	This term is a portion of the nondimensional Grashof 
	Number used for free convection heat transfer studies. 
	The full term is:

		Gr = BETAnc * ( L**3 ) * ( T - Tinf )

	where
		BETAnc = the term provided by STEAM'93
		 \!L = the dimensional length
		 \!T = the local fluid or body surface temperature
		  Tinf = the ambient fluid temperature

	These terms are dimensioned such that Gr is nondimensional.
	Where T - Tinf is large, it is recommended that this term
	(as well as the Nusselt number) be evaluated at (T+Tinf)/2.

Units Coefficient
	Some of the units have coefficients, or exponents with the units
	name. This is intended to be read as a literal suffix to the
	number showing in the cell: don't invert the sign, just assume
	that it is a multiplier to the number showing.

Speed
	If you do not have an 80i87, we recommend MicroWay or Haupage
	as sources. They focus on 80i87 support and have treated us
	well. 

	Please let us know if you have any problems running 
	the program on your system.

Cv and Alpha:
The current release has incorporated new solvers for Cv and alpha 
(isentropic compressibility), in the 2-phase region.  These solvers 
circumnavigate the calculational problems as well as accurate results.

"Gamma"  Becomes  Isentropic Exponent:
To make it more useful, "gamma" is now the isentropic exponent and calculated explicitly according to

 \$gamma = -(v/P)(dP/dv)^!s

which is commonly used where approximations of the perfect gas
relations are useful. 

"Z" Becomes Choked Mass Flux:
The critical mass flux, W*/A, was substituted for the Z coefficient.
W* is evaluated by looking at the input state values as TOTAL conditions.
Speed of Sound:
The sonic speed is now calculated explicitly using the isentropic compressibility in the two phase region.

Benchmarking for the new data:
All of these resulting values and conventions are additionally 
consistent with the ASME Steam Tables, 5th Edition.

	\#Benjamin R. Strong, Jr., P.E

	\%(Ray)