0.6x10' N.s/m") power must be delivered to the pump if Q3 (35 points) A shell and tube heat exchanger must be designed 42 hent 2,5 kasvater from 15 to 85C. The heating is to be accomplished by passing hot engine oil, which is available at 160C, through the shell side of the counter-current exchanger. The oil is known to provide an average convection coefficient of he 400 W/ mK on the outside of the tubes. Ten tubes pass the water through the shell. Each tube is thin walled, of diameter D = 25 mm, and makes eight passes through the Shell (Shell and tube heat exchanger with 10 tubes making eight pass). If the oil leaves the exchanger at 100C, what is its flow rate? How Long nase the tubes be to accomplish the desired heating? Assume negligible thermal resistance of tube material and fouling effects, constart thermophysical properties. Thermophysical properties of the fluids: Water: Oil: Cp - 4181 J/kg K Cp - 2350 J/kg K 4-548x10N./m? k-0.643 W/ mK Pr 3.56