EMPLOYEE WAS SPRAYING WATER ONTO HOT MATERIAL INSIDE OF A CLINKER COOLER. DUE TO ELEVATED AMBIANT TEMPERATURES (90 DEGREES F) HIGH HUMIDITY AND ELEVATED TEMPERATURE IN WORK ENVIROMENT, WHEN EM PLOYEE STOOD UP HE FELT DIZZY AND DISORIENTED. EMPLOYEE WAS GIVEN 1 BAG OF IV SOLUTION AND ALLOWED TO REST. HE CAME BACK TO WORK.