Create an Account

Already have account?

Forgot Your Password ?

Home / Questions / 4500 kgh of ammonia vapour at 67 bara pressure is to be cooled from 120ŽCto 40ŽC using co...

4500 kgh of ammonia vapour at 67 bara pressure is to be cooled from 120ŽCto 40ŽC using cooling water The maximum supply temperature of the coolingwater available is 30ŽC and the outlet

4500 kg/h of ammonia vapour at 6.7 bara pressure is to be cooled from 120ŽCto 40ŽC, using cooling water. The maximum supply temperature of the coolingwater available is 30ŽC, and the outlet temperature is to be restricted to 40ŽC.The pressure drops over the exchanger must not exceed 0.5 bar for the ammoniastream and 1.5 bar for the cooling water.A contractor has proposed using a shell and tube exchanger with the followingspecification for this duty.Shell: E-type, inside diameter 590 mm.Baffles: 25 per cent cut, 300 mm spacing.Tubes: carbon steel, 15 mm inside diameter, 19 mm outside diameter, 2400 mmlong, number 360.Tube arrangement: 8 passes, triangular tube pitch, pitch 23.75 mm.Nozzles: shell 150 mm inside diameter, tube headers 75 mm inside diameter.It is proposed to put the cooling water though the tubes.Is the proposed design suitable for the duty?Physical properties of ammonia at the mean temperature of 80ŽC:specific heat 2.418 kJkg1ŽC1, thermal conductivity 0.0317 Wm1Ž C1,density 4.03 kg/m3, viscosity 1.21 ð 105 N m2s.

 

Jul 24 2020 View more View Less

Answer (Solved)

question Subscribe To Get Solution

Related Questions