
Forced Convection Heat Transfer: External Flows 249
During a cold winter night, the outside air temperature is 4°C and
wind at 50 km/h is blowing parallel to a 3 m high and 8 m long wall of
the house. If the heat transfer coefcient on the interior surface of the
wall is 8 W/m
2
°C, determine the rate of heat loss from that wall of the
house. Disregard any radiation heat transfer.
10.16 Consider a 1.5 m × 1.5 m double-pane window consisting of two 5-mm
thick layers of glass separated by a layer of stagnant air. The inside
convection heat transfer coefcient and air temperature are 7 W/m
2
°C
and 25°C, respectively. The outside air at 5