1. a one-shell-pass and multiple-of-two tube passes heat exchanger is to be used to cool 12 kg/s of oil with an equal flow rate of water. the heat exchanger area of the heat exchanger is 40 m2. the inlet temperatures of the oil and water are thi = 100 c and tci = 20 c, respectively. the specific heats of the oil and water are 2.09 kj/kg. k and 4.18 kj/kg. k, respectively. the total heat transfer coefficient is controlled by the side and is 1000 w/ m2.k. determine the exit temperature of the oil and water.