A heat exchanger consists of a closed system with a series of parallel tubes connected by 180° elbows as shown in the fi gure. Th ere are a total of 14 return elbows. Th e pipe diameter is 2 cm, and...

A heat exchanger consists of a closed system with a series of parallel tubes connected by 180° elbows as shown in the fi gure. Th ere are a total of 14 return elbows. Th e pipe diameter is 2 cm, and the total pipe length is 10 m. Th e head loss coeffi cient for each return elbow is 2.2. Th e tube is copper. Water with an average temperature of 40°C fl ows through the system with a mean velocity of 10 m/s. Find the power required to operate the pump if the pump is 85% effi cient.