In a diary operation, milk at a flow rate of 250L/h and at a cow-body temperature of 38.6C must be chilled to the room temperature of 21C. Ground water at 10C is available at a flow rate of 317L/h. The properties of water and milk can be found in the table in the "Give information page". (a) If a double-tube, counterflow heat exchanger is used, determine the length of the exchanger required if the inner pipe has a 50mm diameter and the overall heat transfer coefficient is 1000 W/m2K (b) Determine the outlet temperature of water in part (a) (c) If a shell-and-tube heat exchanger is used, with 1 shell pass and 2 tube passes, determine the length of the inner pipe needed if the inner pipe has a 50mm diameter and the overall heat transfer coefficient is 1000W/m2K. In a diary operation, milk at a flow rate of 250L/h and at a cow-body temperature of 38.6C must be chilled to the room temperature of 21C. Ground water at 10C is available at a flow rate of 317L/h. The properties of water and milk can be found in the table in the "Give information page". (a) If a double-tube, counterflow heat exchanger is used, determine the length of the exchanger required if the inner pipe has a 50mm diameter and the overall heat transfer coefficient is 1000 W/m2K (b) Determine the outlet temperature of water in part (a) (c) If a shell-and-tube heat exchanger is used, with 1 shell pass and 2 tube passes, determine the length of the inner pipe needed if the inner pipe has a 50mm diameter and the overall heat transfer coefficient is 1000W/m2K