RE: Thermodynamics of Evaporative Cooling

Effective - probably yes. Efficient - definitely not. the dirt in the fins, the orientation of the fin fan coolers with respect to the direction of the wind, and a lot of other factors maybe be worth investigating. the demin water is not a cheap to make. factor in safety and housekeeping O&M your LCC maybe in the red.

• Original Message ----- From: Ahmed Vawda <avawda@aksugar.co.ae> Date: Sat, 15 Mar 2003 09:43:24 +0400 To: "'PipingDesign@yahoogroups.com'" <PipingDesign@yahoogroups.com> Subject: RE: [PipingDesign] Thermodynamics of Evaporative Cooling

>
> Thomas Laupa wrote
> >a customer has an "fin fan" cooler (basically a car radiator) that is
> overloaded. he can increase gas recovery if he can improve the heat
> rejection of this device. rather than increasing surface area, he has
> asked us to explore spraying water on this radiator to increase heat
> transfer.
>
> I think that this is an excellent idea. Air has a poor heat transfer
> co-efficient. Consider this. Steam on the other hand can transfer relatively
> massive amounts of energy upon condensation, by "depositing" latent heat.
> What we are seeing here is the reverse of the steam condensation process.
> In your hybrid "finned evaporative cooler" the evaporation of the sprayed
> water, "withdraws" the latent heat.
>
> Without any data, I would hazard a guess that the capacity would be more
> than doubled. The other advantage you have is that you already have demin
> water. If you had normal tap water, you would have scaled the fins in a
> short time. Corrosion, as another forum member pointed out, would be severe
> in a mild steel fin assembly. I don't think legionnaires disease or slime
> would be a major problem, as this would be a once through process. But it
> would be recommended to check this with a water treatment specialist. (You
> need very small amount of water, not worth re-circulating it.)
>
>
>
> Ahmed Vawda
> Process Engineer
> Al Khaleej Sugar - Dubai
>
>
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