1. condition pertaining to cooling towers and evaporative condensers in which a portion of the discharge air enters along with the fresh air; the amount of recirculation is determined by equipment design, placement in regard to adjoining objects, and atmospheric conditions. The effect is generally evaluated on the basis of the increase in entering wet-bulb temperature compared to the ambient.

2. a condition pertaining to air-cooled condensers in which a portion of the discharge air enters along with the fresh air; the amount of recirculation is determined by equipment design, placement in regard to adjoining objects, and atmospheric conditions. The effect is generally evaluated on the basis of the decrease in unit capacity.