Hot water at an average temperature of 53°C and an average velocity of 0.4 m/s is flowing through a 5-m section of a thin-walled hot-water pipe that has an outer diameter of 2.5 cm. The pipe passes through the center of a 14-cm-thick wall filled with fiberglass insulation (k = 0.035 W/m · K). If the surfaces of the wall are at 18°C, determine

(a) The rate of heat transfer from the pipe to the air in the rooms

(b) The temperature drop of the hot water as it flows through this 5-m-long section of the wall.

Transcribed Image Text:

18°C 53°C 2.5 cm 5 m Hot water Wall