This is both a request and a reference to resources:

I'm looking for a set of algorithms which allow the characteristics of 
moist air to be determined.
Lots of people seem keen to sell me books and programs on the subject 
and there are numerous online calculators covering the core variables.

The essential algorithms which I'm after are here, courtesy of the 
ASHRAE handbook.
This rather messy set of algorithms will probably allow most requisite 
calculations

        http://www.ageng.ndsu.nodak.edu/envr/PsycEqns.htm

Not rocket-science but annoyingly fiddly.



Question: has anyone got any useful comments on the subject and/or 
practical useful algorithms for psychrometric or hygrometric 
calculations. These may be simplifications to or modifications of the 
ASHRAE algorithms or distilled arcane knowledge or ... .


        Russell

____________________________

Other resources:


Online calculators of various capabilities

        http://www.sugartech.co.za/psychro/index.php

        http://www.linric.com/webpsysi.htm


Books

Distressingly thick book give the title :-) - "Understand 
Psychrometrics"
Looks good

    http://www.buildingsciencepress.com/books.asp?CatID=19

Search list - hygrometry tables. For money.

        http://www.worldcatlibraries.org/search?q=su%3AHygrometry+Tables.&qt=hot_subject

Program $US169.

        http://www.123supply.com/hdpsancdbene.html

ASHRAE* Handbook.             * The 600 pound gorilla

        http://www.ashrae.org/pressroom/detail/13624

Psychrometric equations.
Gargoyle says -

        http://www.google.com/search?num=100&hl=en&rls=com.microsoft%3Aen-US&q=psychrometric+equations


________________________

FWIW - The set of parameters that one usually wants to play with 
(taken from my 1st reference above) include enthalpy, latent heat of 
vaporization, heat of sublimation, humidity ratio, pressure, 
saturation vapor pressure, vapor pressure, relative humidity, dry bulb 
temperature, dewpoint temperature, wet bulb temperature, specific 
volume, saturation humidity ratio.


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