Which theoretical and thermodynamic equation or group of expressions and equations can be used for calculation of water loss due to evaporation and wind when it is being flown over evenly using a spraying unit or nozzle system over a smooth glass surface of the Photovoltaic panel forming a thin water film layer as part of the PV cooling system built outdoors at a desert location in North Africa? Can the Penman equation be useful in this scenario for this calculation? Suggestions and sources required from you please?
Dr. Udoetok,
Thank you very much for your time and kind response. Could you please provide or cite a published reference where I could find such an application of the developed energy balance equation for a similar PV cooling system as in my case? This could help me in understanding the necessary assumptions that might need to be made as well towards establishing this equation for calculating the water loss due to evaporation and impact of wind.
Best Regards,
Sambit
This equation is for heat loss from a pool of water due to wind evaporation (gives Watts): You may be able to adapt it:
Fridriksson et al. (2006):
He = A ( hV - hL) (0.0065 + 0.0029w) x ( PH2O TP - PH2O ATM ) / PTOT
where:
A (m2) = surface area of pool
hV (J/kg) = steam enthalpy at pool temperature
hL (J/kg) = liquid water enthalpy at pool temperature
w (m/s) = wind speed (m/s)
PH2O TP (bar) = H2O vapour pressure of water at pool temperature
PH2O ATM (bar) = H2O vapour pressure at local atmospheric temperature and humidity
PTOT (bar) = atmospheric pressure
Hello Mark,
Greetings!
Thank you very much for sharing this equation and its details. I could look for its source and use it as a reference to adapt according to my system.
Best Regards,
I can send you the paper if you email me: mark at harveygeoscience.co.nz
Hello Mark,
I have sent you an email now to the address mentioned by you.
Thanks and Regards,
Sambit
Sambit,
I'm using 'Evaporation from free water surface' by Lurie and Michailoff (1936).
Tractable, robust, and short equations to model water vapour uptake into an airstream from a saturated surface.
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