Milk (essentially water; can be approximated as water) is heated from 15 °C to 25 °C by hot water that goes from 70 °C to 35 °C, as shown in the figure. Assuming the heat exchanger is adiabatic. a) What other assumptions can be made to simplify energy balance? b) Assuming 1 kg/min of milk, what is the mass flow rate of water? Hot water out 35°C Milk out 25°C 15°C Milk In Insulation Hot water in at 70°C