Psychrometric Calculation Suite =============================== I wrote this little program some years ago for the now ancient LZ64 Psion II (remember those things?). I've now re-coded it for the Series 3 (a&c). For anyone who does not know, psychrometrics are the study of the properties of humid air - Something many of us may already have unwittingly participated in after a good night of beer and vindaloo. Unless you are in the air conditioning, or HVAC fields of engineering, this program will soon loose it's novelty value. The program is pretty self explanatory. Accuracy of results is very close to the CIBSE published charts up to temperatures of around 60c and then it becomes gradually more and more inacurate. File list HVAC.OPO The Psion series 3 program. Put in \OPO and run it! HVAC.TXT This file with my current email address. HVAC.EXE MS Windows program, for your further edification. HVAC.DOC MS Windows program documentation. I have also included HVAC.exe, a MS windows program (needs vbrun300.dll) that offers the same calculations, plus dew point in a more user friendly way, with a print facility. Email me on eclipse@dial.pipex.com or comp-u-clic@dial.pipex.com if you have any ideas, or just want to pat me on the back for writing such a handy utility :) Have a nice day now... Oh, and for any miserable sods, I am not responsible for any engineering cock up's made due to the use of these programs!