QUESTION 1 a) You are a process engineer in a juice manufacturing plant and you have been asked to install a heat exchanger for the process's sterilization unit. Your task is to come up with the best flow arrangement. The process requirement is that the hot stream to the unit enters at 125C and exits at 90C, while the cold stream enters at 25C and exits at 80C. Show that the counter current gives the best arrangement economically in terms of superior temperature driving forces and equipment size. b) You are a Projects Manager in a sugar processing plant and you have been asked to come up with a comprehensive design of an evaporator to upgrade on the current piece of equipment. The unit being designed is for the concentration of sucrose juice from the juice heaters with an initial solids composition of 8%. Evaporation will be accomplished under vacuum corresponding to an absolute pressure of 70.14kPa. Saturated steam is available at 617.8kPa and the product is being concentrated to 50% solids. The specific heat of the feed is 3.77kJ/kgC, while that of the concentrated product is 3.35kJ/kgC. The overall heat transfer coefficient is assumed constant at 1.8kW/m2oC. Given that the feed temperature is 25C and that the feed rate is 0.75kg/s, determine the product flow rate, steam consumption rate, steam economy and the heat transfer area for the new unit QUESTION 2 a) You are a trainee process engineer at a newly established distillery and have been asked to fabricate a pipe carrying hot vapors from the rectifying column to the condenser. The objective is to have the outer surface of the pipe at a maximum steady state temperature of 65C. Determine the inside temperature of the pipe (T1) as well as its thickness L. Comment on the values b) For effective cooling in all above, you need to remove as much heat as possible in order to maintain the require coolant temperature for the process. Thus the outside temperature should be maintained at 25C. You therefore face another task of coming up with a suitable condenser material that will satisfy the required duty. Determine the material's thermal conductivity given that the thickness should not exceed 50mm