Two identical heating coils are supplied with hot water at the rate of 0.25 L/s using a reverse-return pipe network as depicted in Fig. P XXXXXXXXXXEach of the coil sections 2-4 and 3-5 consists of 10...

Two identical heating coils are supplied with hot water at the rate of 0.25 L/s using a reverse-return pipe network as depicted in Fig. P12.8.1. Each of the coil sections 2-4 and 3-5 consists of 10 m of piping, a gate valve and a heating coil. The head loss through a coil is 0.8 m. The lengths of the other pipe sections are indicated in the figure. (i) Size the pipes for this system. (ii) Calculate the total head loss from 1 to 7 along the two flow paths 1-2-4-6-7 and 1-3-6-5-6-7.