A thin-walled double-pipe counter-flow heat exchanger is used to cool oil (cp = 2.20 kJ/kg·°C) from 150 to 40°C at a rate of 2 kg/s by water (cp = 4.18 kJ/kg·°C) that enters at 22°C at a rate of 1.5 kg/s. Determine the rate of heat transfer in the heat exchanger and the exit temperature of water.
