The typical formula for temperature drop in evaporative cooling models

[T.Engineer]

By passing warm air through a cotton sock acting as a wick immersed in water, how can I calculate the maximum evaporation to achieve the gratest temperature drop in the air flow? What is the typical formula for temperature drop in evaporative cooling models?

 

[russ_watters]

I'm not sure if there is an easy formula for it, but the number you are looking for is simply wet-bulb temperature. You can read it off a psych chart. It is a function of dry bulb temp and humidity.

Here's some info on the subject: http://www.srh.noaa.gov/elp/wxcalc/formulas/wetBulbTdFromRh.html

 

[T.Engineer]

thanks for your replying. Can you tell me any websites that will provide me with psych charts , wet-bulb tempreture and dry bulb tempreture and Humidity? I mean free download.
Thanks a lot.

 

[russ_watters]

The freeware version of Trane's software is pretty good: http://www.trane.com/Commercial/DNA/View.aspx?i=1250

You can also find just the chart itself through a google: http://www.google.com/search?source...lz=1T4GGLR_enUS213US213&q=psychrometric+chart