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Evaporation Rate

Evaporation Rate

Evaporation Rate

(OP)
Will somebody help me how to calculate the approximate evaporation rate at a waterfall pond. The rate of recirculation water is @ 2,500 GPM.Ambient temperare is 85 deg. F during summer months ( wet bulb temp.),@80% relative humidity. Appreciate any help.

RE: Evaporation Rate

There are a few variables not mentioned, so the best help I can offer is a text reference - See "Engineering Hydrology - Principles and Practices" by Victor Ponce. The publisher is Prentice-Hall (ISBN 0-13-277831-9).  Other texts on hydrology may have similar methods.

RE: Evaporation Rate

visitor, The basic equation I use for approximating Evap. rate is as follows:

E=(c*dT)/1000          Where:
                       E= evap. rate (gal/min)
                       c= system circ. rate (gal/min)
                       dT=system temp. diff. (deg. F)
                          (hot return temp. - cold supply)

Or you could use the general rule of thumb: E is approx. equal to 1% of recirc rate for every 10 deg. diff. between hot return and cold supply temp.

Hope this helps.

saxon

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