V. Determination of heat transfer co-efficient

Tube side heat transfer co-efficient ( h_i ):

                                                                (1.5)

j _H =42 for the tube side fluid at Re=11571.4 ( [3] page 834 )

(Let 's consider = 1, μ = viscosity of the tube side fluid; μ_w = viscosity of tube side fluid at wall temperature)

h_i = 141.3 Btu h^-1 ft ^-1°F^-1

Shell side heat transfer co-efficient ( h_o):

Assumptions:

• •  25% cut segmental baffles

•  Baffles spacing ( B )= 0.5 D_S = 15.5 " (half of the shell ID is selected)

Equivalent diameter for the shell side: (for square pitch)

=0.082ft

Shell side cross flow area, (please refer to Figure 1.6 ).

C = Tube clearance

= P_T - d₀

= 1¼ -1=0.25″

= 0.675 ft ²

Mass velocity,

=210526 lb. h ^-1.ft ^-2

=35668

Now for the shell side,                                              (1.5)

j_H =110 for the shell side fluid at Re=35668 with 25% cut segmental baffles ( [3] page 838 )

( = 1 is considered for the shell side fluid ).

h_o = 155.3 Btu h ^-1 ft ^-2 °F ^-1