4500 kg/hour of ammonia at 6.7 bar pressure will be cooled from 120C to 40C. existing cooling

The highest temperature of the water is 30C and the outlet temperature will be limited to 40C. pipes of the cooling water

flow is recommended. The pressure drops in the exchanger are 0.5 bar for the ammonia flow and the cooling water

should not exceed 1.5 bar. For this load, an entrepreneur has a jacket and tube heat exchanger with the following features:

suggests using the modifier. Is the proposed design suitable for the load in question?

Jacket: E variant, inner diameter 590 mm

Conversions: 25% cutoff and 300 mm spacing

Pipes: Carbon steel, 15mm inside diameter, 19mm outside diameter, 2400mm length, 360 tubing.

Pipe arrangement: Eight passes, triangular array, array distance 23.75 mm

Nozzles: 150 mm ID for jacket, 75 mm ID for pipe heads.

Physical properties of ammonia at an average temperature of 80C:

Specific heat 2,418 kJ/kgC, thermal conductivity 0.0317 W/mC, density 4.03 kg/m3

, viscosity 1.21x10-5 sN/m2

.

Physical properties of cooling water:

Specific heat 4.2 kJ/kgC, thermal conductivity 0.59 W/mC, density 995 kg/m3

, viscosity 0.8 x10-3Ns/m2

.

(/w )

0.14 is considered close to 1.