<p>In order to increase the energy efficiency of the cooling tower and save water, a cooling tower sprinkler has been developed consisting of a dry block — heat exchange tubes of the radiator and a wet block — contact elements in the form of corrugated plates. A mathematical model is proposed for determining the thermal power of the cooling tower dry block. Experimental studies of free-convective heat exchange of in-line bundles of copper tubes of the sprinkler block 100 × 100 mm with a vertical air flow produced by a fan with an adjustable flow rate are presented. Data on the effect of the average velocity of air passing through the sprinkler tube bundle on the change in the thermal power of the cooling tower dry block are obtained. The experimental data are generalized by similarity equations for calculating the average heat emission of bundles and their individual rows. It is proven that an increase in the mass flow rate of liquid in the tubular radiator of the sprinkler dry block leads to a decrease in the total amount of heat removed in the cooling tower. It was found that an increase in the average air velocity in the sprinkler block leads to an increase in the thermal power, as well as to a decrease in the proportion of heat exchange due to natural convection.</p>