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Number of Tubes(Nt):
A - Provisional area of the exchanger in in2 (from eq: 5)
do - Outer diameter of the tube in inches (value from table 6)
L - Length of the tube in inches (from page 7)
Now the number of tubes required for the heat exchanger is obtained from the above formula
q - Mass flow rate of tube side fluid in KW (from eq: 1)
U - Overall heat transfer coefficient in W/m2oc (assumed value from table 6)
DTm - Mean temperature difference in oc (from eq: 4)
Now the provisional area for the exchanger is obtained from the above formula.
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