13-84 Hot oil (Cp=2200J/kgC) is to be cooled by water (Cp=4180J/kgC) in a 2-shell-pass and 12-tube-pass heat exchanger. The tubes are thin-walled and are made of copper with a diameter of 1.8cm. The length of each tube pass in the heat exchanger is 3m, and the overall heat transfer coefficient is 340W/m2C. Water flows through the tubes at a total rate of 0.1kg/s, and the oil through the shell at a rate of 0.2kg/s. The water and the oil enter at temperatures 18C and 160C, respectively. Determine the rate of heat transfer in the heat exchanger and the outlet temperatures of the water and the oil. Answers: 36.2kW,104.6C,77.7C FIGURE P13-84