Air is heated in a circular duct with a diameter of
0.4m
as shown in the figure. Calculate the exit temperature of the air for the following two cases: Chilled air flows in a thin-walled circular air- conditioning duct as shown in the figure. Outside of the duct is exposed to warm air at
37\deg C
as shown. Calculate the exit temperature of the air for the following two cases: i- Constant duct surface temperature of
37\deg C
ii- Duct is exposed to convection of air at
37\deg C
with convective heat transfer of
4(W)/(m^(2))K