Cooling Tower plume formation 1

[igorv2]

Could someone, please, point me where I can find algorithm or formulas to calculated when and if future cooling tower would produce plume. Provided all ambient climatic conditions and cooling tower performance data are known factors.

 

[pk786]

IGORV2
your Q is not clear are u talking about the Fan blades of cooling tower.

 

[lilliput1]

If the available cooling tower latent heat rejection is less than the actual cooling tower heat rejection then the coling tower discharge air will be oversaturated resulting in fogging or plume.
That is if CFM x .69143 x (gr/lb humidity at saturation at ambient db - gr/lb humidity of ambient air) < Btuh heat rejection.

Where CFM = cooling tower fan CFM
gr/lb = grains per lb = 7000 x lb moisture/lb dry air

Btuh heat rejection = Cooling load Btu/hr + Compressor input in Btu/hr

 

[igorv2]

pk786
It is fan blade Cooling Tower. Open cycle CW system for Co-Generation plant.
However I think lilliput1 has answered my question. I just have to convert it into metric system.
Thanks.

 

[25362]

There are two components of the visible mist off a cooling tower: drift as a result of entrainment of droplets, and plume as a result of condensation of the moisture of the outcoming air when in contact with colder air. These emissions are generally dealt with by installing mist eliminators and plume abatement (water pre-cooling) coils, respectively.

 

[igorv2]

25632 Thanks.
I am interested in potential plume only. We believed we can eliminate drift with better then 0.001% drift eliminators provided by CT supplier.

 

[imok2]

25632:
This may be of some us to you.

http://www.google.com/search?hl=en&lr=&ie=ISO-8859-1&q=cooling+tower+plume+analysis&btnG=Search

 

[25362]

to igorv2, what CT cooling tonnage are you referring to when speaking of a drift as low as 0.001% = 10 ppm of the circulating cooling water, or is it the amount of particles on the atmosphere on the top of the CT ?