Water mist nozzle refers to a nozzle that decomposes water flow into droplets smaller than 1mm under a certain water pressure. When the water enters the nozzle, it is decomposed into a rotating water flow with centrifugal velocity moving along the inner wall and a straight water flow with axial velocity. The two streams of water converge inside the nozzle and then spray out at their combined velocity to form atomization. Calculate the flow rate of water mist nozzles and the required quantity in a certain area, and check whether the number and flow rate of water mist nozzles in this area meet the standards.