The experiments are based on the setting of blade angles in cooling tower of 5 tons of refrigeration at the blade angle 59°, 67°, 75°, and 83° of respectively. For the testing of cooling tower, the hot water temperature remains constant at 40°C and the variation of circulating water flow rates are from 23.87 to 53.38 L/min and wet bulb temperatures varied from 25 to 27°C.