Step 2. Calculate collection efficiency required by state regulations. Because the inlet loading is known and the outlet loading is set by the regulations, we can readily calculate the collection efficiency:
Step 3. Does the spray tower meet the regulations? No. The collection efficiency, based on the design data given by the vendor, should be higher than the collection efficiency required by the state regulations.
Step 4. Assuming the spray tower does not meet the regulations, propose a set of operating conditions that will meet the regulations.Note that the calculation procedure is now reversed.
Calculate the total pressure loss PT, using the collection efficiency required by the regulations in horsepower per 1000 acfm.
Calculate the number of transfer units for the efficiency required by the regulations: