Example 4: Hot air at atmospheric pressure and 80°C enters an 8–m-long uninsulated square duct of cross section 0.2 m x 0.2 m that passes through the attic of a house at a rate of 0.15 m³/s (Figure). The duct is observed to be nearly isothermal at 60°C. Determine the exit temperature of the air and the rate of heat loss from the duct to the attic space. p = 0.9994 kg/m³ k = 0.02953 W/m · °C v = 2.097 × 10-5 m²/s = 1008 J/kg · °C T;=60°C 0.2 m Pr = 0.7154 Air I atm 80°C 0.2 m 8 m
Example 4: Hot air at atmospheric pressure and 80°C enters an 8–m-long uninsulated square duct of cross section 0.2 m x 0.2 m that passes through the attic of a house at a rate of 0.15 m³/s (Figure). The duct is observed to be nearly isothermal at 60°C. Determine the exit temperature of the air and the rate of heat loss from the duct to the attic space. p = 0.9994 kg/m³ k = 0.02953 W/m · °C v = 2.097 × 10-5 m²/s = 1008 J/kg · °C T;=60°C 0.2 m Pr = 0.7154 Air I atm 80°C 0.2 m 8 m
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Example 4: Hot air at atmospheric pressure and 80°C enters an 8–m-long uninsulated square duct of cross section 0.2 m 0.2 m that passes through
the attic of a house at a rate of 0.15 m3/s (Figure). The duct is observed to be nearly isothermal at 60°C. Determine the exit temperature of the air and the rate of heat loss from the duct to the attic space.
Transcribed Image Text:Example 4: Hot air at atmospheric pressure and 80°C enters an 8–m-long
uninsulated square duct of cross section 0.2 m × 0.2 m that passes through
the attic of a house at a rate of 0.15 m³/s (Figure). The duct is observed to
be nearly isothermal at 60°C. Determine the exit temperature of the air and
the rate of heat loss from the duct to the attic space.
p = 0.9994 kg/m³
k = 0.02953 W/m · °C
v = 2.097 × 10-s m²/s
C, = 1008 J/kg · °C
T;=60°C
0.2 m
Pr = 0.7154
Air
I atm
80°C
0.2 m
8 m
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