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Hi,

I need help to convert humidity to wet bulb temp in the PLC. Is there a formula for this conversion?

Thanks.

Anonymous...
If you are refering to Specific Humidity of Air (Humidity Ratio) I have a Nomogram that can help. Send me your address and I will send it to you!

Regards, Phil Corso, PE (Cepsicon@aol.com)

For the benefit of robotic webcrawlers harvesting email addresses, the at symbol is replaced by a unicode happy face: ☺

cc:
Cepsicon☺aol.com
nyrath☺projectrho.com

Title: Water Vapor Calculations

I put this letter on the
http://www.control.com/thread/1026234127
http://www.control. com/thread/1026234618
http://www.control.com/thread/1026157279
foru m.

I put the Bill Sisson, Nipak, Inc. Pryor, OK,
and F. Caplan, Power's Data Sheet, Oakland CA,
charts online at
http://www.issi1.com/corwin/calculator/Sisson_specific.pdf
ht tp://www.issi1.com/corwin/calculator/Sisson_absolute.pdf
http://www.is si1.com/corwin/calculator/Caplan_density.pdf
http://www.issi1.com/corw in/calculator/Caplan_dew.pdf

and linked to them from

http://www.ConcurrentInverse.com
http://www.issi1.com/c orwin/calculator/vapor.html

which in return is linked to from

http://en.wikipedia.org/wiki/Psychrometrics .

It might be better to have the journal name, date and page number for the references. Someday I might make nomograms digitally in the .svg format so that they can be scaled up to achieve any precision desired.

I don't know the best way to do every calculation
but the more references there are the more ways
will be available to check the calculations.

ref:
Phil Corso
id=1026234127
nomogram collection of Cepsicon@aol.com
forum at control.com

Sisson_specific.pdf 0727-1 Specific Humidity.PDF
Bill Sisson, Pryor Oklahoma
nomogram and BASIC microcomputer program determine specific humidity of air

Sisson_absolute.pdf 0727-2 Vol Wtr vs Twb Tdb .PDF
Bill Sisson, superintendent of Operations, Nipak, Inc. Pryor, OK
Oil, Gas & Petrochem Equipment March 1978
Nomogram determines volume percent of water in air

Caplan_density.pdf 0727-3 Moist-Dry Air Density.PDF
F. Caplan, Oakland CA
Calculate density of moist or dry air Power's Data Sheet

Caplan_dew.pdf 0727-4 Compressed Dew-Pt.PDF
F. Caplan, Oakland CA
Calculate dew point and water content of compressed air Power's Data Sheet

http://www.projectrho.com/nomogram/compound.html#familysc ale
nyrath☺projectrho.com