5. 1)

10. 1.1)

12. 1.2)

13. Another relation for critical flux

14. 1.3)

27. 64

28. ( ) 2)

36. Another commonly used type is Fired reboiler
Fired heaters (furnaces) may be used as a distillation column reboiler. A pump is required to circulate the column bottoms through the heat transfer tubes in the furnace's convection and radiant sections

41. Approximate method for Thermosiphon preliminary design
Obtain the physical properties of the boiling liquid (Boiling point, critical temperature, molecular weight, latent heat of vaporization) and the process fluid (saturation temperature).
Calculate the mean overall ∆T= Tsat, steam - Tboiling
Calculate the reduced temperature Tr= T/Tc
Estimate the design heat flux from Figure 12.61
Calculate the heat load Q=m x hfg
Calculate the area A= Q/heat flux

42. Thermosiphon design continued………
Assume id, od, and length for the tubes
Calculate the area for one tube (A1) and the number of tubes N=A/A1
Assume a pitch configuration and get n, K1 from the table.
Calculate the bundle diameter, shell clearance and shell diameter.
The output diameter = SQRT(N*Across*4/Pi]

44. Example