Question: Water flowing at a rate of 0.667kg/s enters a countercurrent heat exchanger at 308K and is heated by an oil stream entering at 383K at a rate of 2.85kg/s (Cp=1.89kJ/kgK). The overall U=300 W/m2K and the area A=15.0m2. Calculate the heat-transfer rate and the exit-water temperature. Instead of using 370K for our assumption, please use 361K as the value for Tco. Find the new: 1. Tc ave where: Tc ave =0.5(Tco+Tci) 2. Cpc at Tc ave 3. Cmin 4. NTU 5. 6. q 7. Tco Table A.2-5. Heat Capacity of Liquid Water at 101.325kPa (1 Atm) Source: N. S. Osborne, H. F. Stimson, and D. C. Ginnings, Bur. Standards J. Res., 23, 197 (1939). (a) (b) Figure 16.3-2. Heat-exchanger effectiveness : (a) counterflow exchanger, (b) parallel flow exchanger