The relation between the Spray Energy Release (SER) and the spray nozzle efficiency (η) is considered with the view toward increasing the utility of previous spray thermal performance information. Through the approximate analysis of an assumed counter-flow process, the relevant parameters that η depends upon have been identified as the total heat transfer factor c/cw, the sensible heat factor φ, and the SER. In general η cannot be correlated with wind speed alone. Similarities and differences between the NTU and SER methods are also considered. Values of SER are established from data obtained from a prototype spray system and a laboratory scale single column spray system. A simplified drift loss prediction model which is in good agreement with experimental data is proposed for an open atmosphere spray system.

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