Air at atmospheric pressure and 20 degree Celsius flows with 6 m/s velocity through main trunck duct of air conditioning system. The duct is rectangular in cross-section and measures 40 cm by 80 cm. Determine heat loss per meter length of duct corresponding to unit temperature difference. The relevant thermos-physical properties of air arev = 15 * 10 -6 m 2/sα = 7.7 * 10 -2 m2/hrk = 0.026 W/m degree

Air at atmospheric pressure and 20 degree Celsius flows with 6 m/s ve

1.	Air at atmospheric pressure and 20 degree Celsius flows with 6 m/s velocity through main trunck duct of air conditioning system. The duct is rectangular in cross-section and measures 40 cm by 80 cm. Determine heat loss per meter length of duct corresponding to unit temperature difference. The relevant thermos-physical properties of air arev = 15 * 10 -6 m 2/sα = 7.7 * 10 -2 m2/hrk = 0.026 W/m degree
A.	32.768 W
B.	42.768 W
C.	52.768 W
D.	62.768 W
Answer» C. 52.768 W

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