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STHE - Inclusion of " pipe K" and thickness in "U"

STHE - Inclusion of " pipe K" and thickness in "U"

STHE - Inclusion of " pipe K" and thickness in "U"

(OP)
Dear members,

As in page no- 62 of Applied process design for chemical and petrochemical plants by E.E. Ludwig volume three, how to incorporate tube material thickness and conductivity in the worked out example in page no-106(Condensation  in the presence of non condensables).Any suitable example.

Thanks

RE: STHE - Inclusion of " pipe K" and thickness in "U"

(OP)
Dear friends,
The following are the equations:

Page : 106  The following common equation is used for both desuperheating and condensing.
  1         1            
----  =   ----  +  ro
 U(dir)  ho               




Page 58 / Page 62:  

  1        1           Lw   { Ao }            1
----  =  ----  +  ro +  ---- {----- }  + ri + ----
 U         ho          Rw  {Avg. }            hi [Ai].
                                   [Ao]

ho - film coefficient outside tube
hi - film coefficient inside tube
ro - fouling factor outside tube
ri - fouling factor inside tube
Lw - tube wall thickness.
Rw- tube thermal conductivity
  

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