A double-pipe heat exchanger is to receive 6.93 kg/s of 95% ethanol (Cp = 3810 J/kg.K), to be cooled from 70°C to 45°C. Cooling water at 10°C is available at a flowrate of 6.3 kg/s (Cp = 4187 J/kg .K). An overall heat transfer coefficient of U = 568 W/m2. K is measured. Find the outlet water temperature and the re- quired exchanger area for cocurrent and countercurrent arrangements.
