4500kg h of ammonia vapour at 6.7 bara pressure is to he cooled from 120°C 40°C, using cooling water. The maxinum supply temperature of the cooling availabie is 30°C, and the outlet termperature is to be restricted to 40°C. The pressure drops over the exchanger must not exceed 0.5 bar for the ammonia A contractor has proposed using a shell and tube exchanger with the following Shel: E-rype, inside diumeter 590 m Beffies 25 per cent cut, 300 mm spacing Tuber carbon steel, 15 mn inside diameter, 19 mm outside diameter, 2400 mm Tube amangement:8 passes, triangular tube pitch, pitch 23.75 mm. Nozzies shell 150 mm inside diameter, tube headers 75 mm inside diameter. Il is proposedio putthe cooling water though the tubes. Is the proposed design suitable for the duty? Physical properties of armmonia at the mean temperature of 80°C: specific heat 2.418 kgC, thermal conductivity 0,0317 W/m°C, density 405km m3, viscosity 121 x 10-5N/m2s.