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QUESTION 2 (PO2, CO2, C4, C6) Geothermal water (c=4250 J/kg-C) is to be used to heat fresh water (c=4180 J/kg-C) in a one shell pass and 4 tube passes heat exchanger. Geothermal water flow through the shell at 70 C and leave at 40 C with a heat transfer coefficient, ho = 2.5 kWm2K. The fresh water enters the thin tube at 20 C and leave at 45 C. The heat transfer surface area is 50 m. The inner convection heat transfer coefficient is to be estimated twice the outer convection heat transfer coefficient. a) Determine the rate of heat transfer. (13 marks) IL b) The outlet cold temperature found to decrease by 5 C due to the deposition of solids on the tube surface after 3 years of operations. Evaluate the new outlet temperature of the hot stream (12 marks)