A 1–2 shell-and-tube heat exchanger has the following dimensions:

Tube length: 20 ft

Tube diameter: 1-in, BWG 14 carbon steel (k_cs = 45 W/m/K)

Number of tubes in shell: 608

Shell diameter: 35 in

Tube arrangement: Triangular pitch, center-to-center = 1.25 in

Number of baffles: 19

Baffle spacing: 1 ft

Baffle: Horizontal baffle with baffle cut = 25%

The fluids in the shell and tube sides of the exchanger have the following properties:

It may be assumed that neither fluid changes phase, and the viscosity correction factor at the wall may be ignored for both fluids. Determine the following:

The inside heat transfer coefficient

The shell-side heat transfer coefficient

The overall heat transfer coefficient (assuming that fouling may be ignored)

The exit temperatures of both fluids

Transcribed Image Text:

Shell Side Tube Side 120 30 120 180 4.2 Specific heat capacity, c, (kJ/kg/K)2.0 Cp Thermal conductivity, k (W/m/K) 0.2 Density, r (kg/m³) 0.61 850 1000 Viscosity, m (kg/m/s) 5.0 10 40.72 × 10-³ Inlet temperature (°C) Mass flowrate, m (kg/s)