Psychrometrics Question

[Vivek]

I am trying to create a table with Dew Point on one axis, Dry Bulb Temperature on the other axis and the corresponding enthalpies inside. Does anybody know of a way to do this? Or does anybody know if such a table exists?

[Diceman]

I tried to create another human being out of old body parts once.
I called him Frank.

[ACFIXR]

Maybe this will get your mind headed in the right direction

[Vivek]

I tried using the equations in ASHRAE Fundamentals 2005 (Chapter 6). But it gets pretty complicated as the equation for Dew Point is a cubic equation.

[midhvac]

Best way is probably to create lookup tables in Excel using data from Ashrae tables.

[dandyme]

look in here

or see if engineeringtoolbox has anything that is beneficial

[Chris_Worthington]

Looking for this??

HD X CFM'S X 4.5 = TH

This makes it almost like cheating though :whistle:

[koldenhott]

I am trying to create a table with Dew Point on one axis, Dry Bulb Temperature on the other axis and the corresponding enthalpies inside. Does anybody know of a way to do this? Or does anybody know if such a table exists?

I'm interested in the "question behind the question"...

For what purpose or use?

[Chris_Worthington]

I'm interested in the "question behind the question"...

For what purpose or use?

See post above, I bet this is what he is after and it makes sense. Simplicity :D

[Vivek]

I'm interested in the "question behind the question"...

For what purpose or use?


I am doing this to make my Economiser savings calcualtions spreadsheet a little more easier to handle. It has two columns with Dew point and Dry Bulb. In order to enter the corresponding enthalpy I have to look up a psych chart or use some online tool and enter it manually. I want to automate this process.

[richlaf]

http://www.control.com/thread/1026219626

See if this is what you are looking for. It uses dry bulb and relative humidity but you should be able manipulate the relative humidity part to wet bulb dry bulb.

[Vivek]

Still no solution :( Somebody help!

[lynn comstock]

Look at this:
167932
from http://www.engineeringtoolbox.com/dry-wet-bulb-dew-point-air-d_682.html
You could do it yourself, point by point.