Page 195 - Applied Process Design For Chemical And Petrochemical Plants Volume III

66131_Ludwig_CH10F 5/30/2001 4:35 PM Page 158

158 Applied Process Design for Chemical and Petrochemical Plants

Figure 10-94. Heat transfer coefficients for jackets and coils with fluid agitation. (Used by permission: Engineering Manual Dowtherm™ Heat
Transfer Fluids, ©1971. The Dow Chemical Co.)

• The film coefficient for the oil, h i 360 Btu/(hr) (ft )
2
DOWTHERM A will be used at 620°F (326.67°C) in a horizon-
(°F).
tal tubular heat exchanger.
• The fouling factors for the oil will be
Assumptions:
2
r i 0.003 (hr)(ft ) (°F)/Btu, for DOWTHERM A
• The exchanger will have one shell pass and one tube r o 0.001 (hr)(ft ) (°F)/Btu
2
3
pass. • Tubes in the exchanger will be / 4 -in. O.D., 16 BWG
• DOWTHERM A will be on the shell side of the exchanger, steel.
and no subcooling will take place. • Oil specific heat, c p 0.40 Btu/lb/°F.