Watr Documentation
------------------

By Conan J. Fee

Hi there,

Here is an application I've written which calculates water vapour and
liquid properties as a function of temperature (see doc for acknowledgements).


			     WATR V1.0			


			 WATER PROPERTIES

				by
			
			   CONAN J. FEE

		UNIVERSITY OF WAIKATO, NEW ZEALAND



This is a set of routines for calculating water properties (both liquid and 
vapour) (eg:viscosity, specific volume, density, etc, etc...) as a function of 
temperature. The simple user interface allows you to input the temperature
and then to determine the desired property. It's self-explanatory, but I'll
explain it anyway:

The temperatures must be within the specified range of 32_F to 440.3_F
(see "HELP" screens) and the package will not let you enter temperature 
values outside this range.

Units may be specified in advance as SI or ENGL (default). Outputs have
appropriate units attached. Units are checked if you follow the correct
procedure (ie:don't go by-passing the built-in menus).

Just try it - you'll see and I hope you'll find it useful. You ought to if
you're a Chem Engg major.

The calculations are based on a set written by D.S. Dickey in two articles
in 'Chemical Engineering' Sept 1991, pp207-8 and Nov 1991, pp235-6. All
credit for the correlations should go to him. The correlations were
created from tables in Perry's Chemical Engineers' Handbook 6th Edtn.

Some variables hidden for user convenience using the HIDE application from
Educalc Goodies Disk #1, written by Morgan Lindqvist and Mattias Dahl.

I will accept absolutely NO liability for any problems, losses or damage that 
might arise by any (correct or incorrect) application of the properties 
calculated by this package - basically if it's THAT important to you, 
check the results first!!!

The following is a list of the maximum errors in the calculated properties
as given by Dickey in the second of his two articles:

	Property Correlation	Maximum Error (%)
	
	Vapour Pressure		3.64
	Boiling Point		2.66	(as a function of pressure)
	Liq. Specific Vol.	0.12
	Therm. Expans. Coeff.	-
	Liq. Density		0.26
	Vap. Specific Vol.	8.47
	Vapour Density		7.81
	Liq. Enthalpy		3.08
	Lat. Heat Vap.		0.63
	Vapour Enthalpy		0.26
	Liq. Specific Heat	0.25	(0.11 for 32_F < T < 250_F)
	Vap. Specific Heat	0.49
	Liq. Viscosity		20.23
	Vap. Viscosity		0.37
	Liq. Therm. Conduc.	0.43
	Vap. Therm. Conduc.	1.09
	Liq. Prandtl No.	11.10	(3.14 for 53.3_F < T < 260.3_F)
	Vap. Prandtl No.	0.76


To use this package, just transfer the following ->ASC listing to the
HP48SX via Ascii transfer, recall the string to the stack, run ASC->
on it and STO it in the original variable again.

You should get a directory named "WATR". Enter the directory and read the
help screens for instructions. Basically, just run UNITS to get SI,
run TEMP and answer the question, then run PROPS to enter the property
calculation directory. Choose the property you want and press the 
appropriate softkey.

I strongly recommend (if you use SI units, as you should) that you quit
the application via the EXIT and QUIT softkeys. This will clear the
user flag set during the execution of UNITS.

Enjoy.

PS: This is freeware, but just give me credit if you do anything with the 
program and include the message regarding no liability with any copies. 

Also, it's written in user RPL - I know it's inefficient, but
I'm a COMPLETE novice as far as system RPL or ML are concerned. If
any enterprising person wants to develop this thing more efficiently
or rewrite it in ML feel free to do so. My only request is that you
write out the process for doing so in PAINFULLY SIMPLE language that
even a half-wit such as myself can understand, so I can learn how....

Maybe I'll turn it into a library sometime...

Cheers.  Conan Fee