For mechanical draft cooling tower group, warm, saturated air discharged from cooling towers can produce recirculation, so as to increase temperature and moisture of air entering into cooling tower. The researches show that the recirculation ratio is related to length of cooling tower row, the distance between tower rows, tower structure and wind velocity and the angle between long axis of tower row and wind direction. Based on present formulas for calculating cooling tower recirculation ratio, a new formula for the warm and saturated air recirculation ratio is presented through simulative experiments and running test on site for different cooling tower groups. According to the new formula, the calculated results are in accordance with test values on site. The related factors will be adjusted based on the new formula, so as to obtain the minimum recirculation ratio. The formula can be used to calculate practical recirculation ratio of cooling tower group correctly and optimize layout of cooling tower group.
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