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Thread: Comparator Formulae
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20-11-2011, 01:05 PM #1
Comparator Formulae
Hey,
I'm a refrigeration apprentice studying R&AC, I'm also beginning my DofE Gold, as my skills project I am looking to do a bit of software development for the industry as a 6 month project. Long story cut short, I am looking for formulas to calculate saturation temperatures at certain pressures (and vice-versa) like a comparator would. Everywhere I have looked fails to give me a straightforward equation with variables, is this because of the complexity of the equations?
I did find a Visual Basic resource (I will be programming the application in Visual Basic) that seems to have all the functions I would need, but I'd rather program one myself if I knew the equations.
Thanks in advance to anyone who can help,
Wazza.
PS: Here's a link to the VB resource for those who are interested, http://www.boulder.nist.gov/div838/t...rop/REFPROP.VB
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20-11-2011, 01:28 PM #2
Re: Comparator Formulae
iphone app
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20-11-2011, 03:48 PM #3
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20-11-2011, 10:16 PM #4
Re: Comparator Formulae
I knew this subject had come up before and using the site search facility you would have found it as well.
Anyway this is a copy of the post from an earlier thread, it might get you going.
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If you want the formulae used by DuPont then download this pdf file...
http://www2.dupont.com/Refrigerants/...o_prop_eng.pdf
The above is English units, if you want SI then select from the list here..
http://www2.dupont.com/Refrigerants/...rature.html#ptBrian - Newton Abbot, Devon, UK
Retired March 2015
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21-11-2011, 01:47 AM #5
Re: Comparator Formulae
Hi all.
the industry in europe is full of abbreviations. Can nobody speak/type what ever in real language. This is an international forum. I could fire in a lot local stuff from NZ to totally Pizz off everybody, but I am respectful to the global readers.
grump
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21-11-2011, 09:06 PM #6
Re: Comparator Formulae
Hi, WazzaJB
welcome to RE forums .....
Please check this ....
http://www.refrigeration-engineer.com/forums/showthread.php?21844-NIST-Ref-Prop
http://www.refrigeration-engineer.com/forums/showthread.php?19752-Equation-engineering-solve
http://www.refrigeration-engineer.com/forums/showthread.php?10271-Refrigerant-properties-calculator
http://www.refrigeration-engineer.com/forums/showthread.php?30760-Specific-heat-capacity-for-saturated-vapor-and-liquid
http://www.refrigeration-engineer.co...read.php?9731-Temperature-to-Pressure-Formulas-for-R22-R12-R717-etc
http://www.refrigeration-engineer.co...read.php?3807-Numerical-Methods-for-Engineers-and-Scientists-Second-Edition
http://www.refrigeration-engineer.co...read.php?3916-EES-user
not too much to read but with many useful links and suggestions .... hope to be of some help to you ... good luck ... of course you can make your own investigation of RE forums ....
Best regards, Josip
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