A cross-flow heat exchanger used in a cardiopulmonary bypass procedure cools blood flowing at 5 liter/min from a body temperature of 37°C to 25°C in order to induce body hypothermia, which reduces metabolic and oxygen requirements. The coolant is ice water at 0°C, and its flow rate is adjusted to provide an outlet temperature of 15°C. The heat exchanger overall heat transfer coefficient is 750 W/m2 . K. The density and specific heat of the blood are 1050 kg/m3 and 3740 J/kg . K, respectively.
(a) Determine the heat transfer rate for the exchanger.
(b) Calculate the water flow rate.
(c) What is the surface area of the heat exchanger?