Heat and Mass Transfer of Spray Canals

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Abstract
A numerical analysis is presented for the heat-exchanger performance of open, direct-contact evaporative spray cooling of large electric power plants. Floating spray modules are placed essentially in series in this large-scale application. The module “unit performance” is formulated in terms of Number of Transfer Units (NTU) as suggested by elementary drop dynamical theory. The overall canal performance is analyzed by a numerical procedure of marching along from pass to pass of spray modules. Hydrodynamic mixing within the canal and air-vapor circulation interference above the canal are incorporated as suggested by theoretical considerations and field experiments. The analysis was applied to a number of field tests of several spray canals and the apparent values of NTU were correlated with wind speed.

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