Benzene flows through the annulus of a concentric tube heat exchanger, which consists of an inner 2-inch schedule 40 steel tube inside a 3-inch schedule 40 steel tube. This exchanger has been in operation for several months and the exit temperature of the benzene has decreased over time. An analysis of the benzene shows some acid impurities. Steam tests indicate that there is no reason for excessive corrosion within the downtube. Flow Rate: 4400 lb/hr of Benzene Benzene Temp = Inlet 70F Out 130F Steam temperature = 240F Steam heat transfer coefficient = 2000 BTU/ lb.h.ftF Effective Heat Transfer Length = 15 Ft Calculate: a) The heat exchanged b) The magnitude of the resistance of the impurity deposit

Please explain the procedure and calculations, thank you.

\begin{tabular}{|c|c|c|c|c|} \cline { 3 - 5 } \multicolumn{2}{c}{} & \multicolumn{2}{c|}{ Benceno } & \multicolumn{1}{c}{} \\ \hlineT1 F & 1 lb1/pie3 & Cp1 Btu/b-F & k1 Btu/pie-h-F & 1 lb/pie-h \\ \hline 90 & 54.063 & 0.42532 & 0.08309 & 1.33211 \\ \hline 100 & 53.694 & 0.42821 & 0.08235 & 1.23713 \\ \hline 110 & 53.32 & 0.4311 & 0.08161 & 0.45086 \\ \hline 120 & 52:965 & 0.43398 & 0.08085 & 1.07238 \\ \hline 130 & 52.585 & 0.43689 & 0.08008 & 1.0009: \\ \hline \end{tabular}