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2. A shell-and tube heat exchanger with one shell pass and 20 tube passes uses hot water on the tube side to heat oil on the shell side. The single copper tube has inner and outer diameters of 20and 24mm and a length per pass of 3m. The water enters at 87C and 0.2kg/s and leaves at 27℃.Inlet and outlet temperatures of the oil are 7 to 37℃. What is the average convection coefficient for the tube's outer surface? (Use NTU-effective method)

Fig: 1