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1) A 1-2 (one shell pass, two tube pass) shell and tube heat exchanger (STHE) contains 90 tubes, 1 in Outer Diameter (OD) 14 BWG (British Wire Gauge) stainless steel tubes arranged in staggered pitch with longitudinal and transverse pitches of SL=ST=2 inches. This heat exchanger will be used to heat 5kg/s of liquid water from 60C to 90C. Heating will be accomplished by saturated steam having a gauge pressure of 169kPa and condensing in the shell side. The heat transfer coefficient for the shell side will be assumed to be equal to 15000 W/m2.K. If the length of the proposed STHE is 6m. ( 1in=2.54cm;Patm=101.1kPa ) a) Find the required steam mass flow rate of the steam for this process ( 10 point) b) Is this SHTE satisfactory for your requirement? Your reply should be based on calculations ( 30 point) c) What type of heat transfer mechanism occurs in that system, give your reasings by explaing the mechanism briefly and drawing the thermal resistance diagram. (10 point)