evaporative cooling air washer

[rick75]

Hello all

I'm new here but would really appreciate if I could get some opinions on a evaporative cooling/air washer question. I've got an airflow at 153 deg dry bulb and 138 deg WB. I'm trying to find out if it is possible to cool this airflow down to 120 deg DB using a 70 deg (lake water) air washer.

I know that the airflow will approach the 138 deg WB temperature via evap cooling, but what happens if you keep atomizing 70 deg lake water into that saturated air stream. In other words, what happens if you keep misting cold water into a hotter saturated airflow? I figured the heat lost out of the system would be from the excess moisture that drains out of the system and has taken some of the hotter vapor droplets with it. The question is then, what is the temperature of that drainage? Somewhere between 70 and 138 deg I presume. Wouldn't the answer be highly variable as to how well the atomized spray mixes with the existing vapor?

Any insight would be greatly appreciated!

Thanks in advance

 

[zdas04]

The 138F WB temperature is the temperature the air would reach with no further heat input. Adding your 70F water changes the energy balance drastically. A typical swamp cooler can get you to 20F below ambient from the heat used to evaporate the water. If you pump enough lake water (and have enough contact surface) then the minimum temp you can achieve is on the order of 50F if you have room in your ambient RH for that much water.

David