A power converter assembly with 800-W power loss is mounted on a 20-cm square base plate cooled

Question:

A power converter assembly with 800-W power loss is mounted on a 20-cm square base plate cooled by water. The water tubes are of 2-mm internal diameter placed on a 15-cm square with four 90° bends as shown below. If the inlet and outlet water temperature difference is to be limited to 25°C, determine the water flow rate in liters per minute.

20-cm square plate 15-cm square