Calculate Wet Bulb based on changing dry bulb.

[rifter1]

Manual J publishes design dry and wet bulb data for each city.

So, for instance: Phoenix, AZ would be 107 db, and 71 wb for outdoor air.

However, I want to calculate what the wet bulb would be if I took the published conditions and changed the dry bulb to indoor air temperature of, for instance: 75F.

Using a Psychometric chart this is very simple. You just look left along a horizontal line until you hit the new dry bulb temperature, and you have your wet bulb.



Does anyone have a formula that would do this so I can do it in Excel?

 

[Wizeman]

I agree gepman, I finally caught on to the workings of the process. As for trashcanman's method I see the idea, although I find it much easier to visualize the process using Db and RH.

Thanks a lot for the explanation!

 

[trashcanman]

Wizeman, the same method is used given Db and RH. It works.

 

[Wizeman]

Sure does!

I got the whole thing working
If you want to try out the BETA of my program go to:

http://www.v2cstudios.com/en/psychrometree.html

Read my blog page for more info.

 

[marcoh]

nice work!