2. ( 35 points) You are working on designing a heat exchanger to meet the following specification given. A shell-and-tube heat exchanger (one shell passes, two tube passes) will be used to heat 500kg/h of pressurized saturated water from 79C to 175C using 1000kg/h of pressurized saturated water entering the exchanger at 250C. The overall heat transfer coefficient for the proposed heat exchanger is 220 W/m2K. The heat exchanger surfaces are unfinned, and fouling is negligible. (a) Draw a sketch of the heat exchanger design. (b) Use Table A.6 to find the specific heat of the water in the cold stream at the mean temperature. (c) Use Table A.6 and iterate to find the outlet temperature of the water in the hot stream and the specific heat the mean temperature. (d) Using the -NTU approach, find the number of transfer units (NTU) for this heat exchanger. (e) Calculate the heat exchanger surface area (m2) required to meet the design specifications given. Tim1e A.6 Thermophysical Properties of Saturated Water a TARLE A. 6 Continued