Question

Take mass flow rate = 0.45 m/s Length (L) = 7 m H = W = 0.25 m Ti = 38°C; Ts = 20°C Warmed air at 1 atm and TC enters an L-m long rectangular duct with a cross-section of H x W (H = W). The duct is maintained at a constant surface temperature of TC, and the air mass flow rate is m kg/s. Determine: a. The heat transfer rate from the warmed air to the duct. b. The air outlet temperature. 

          Take mass flow rate = 0.45 m/s
Length (L) = 7 m
H = W = 0.25 m
Ti = 38°C; Ts = 20°C

Warmed air at 1 atm and TC enters an L-m long rectangular duct with a cross-section of H x W (H = W). The duct is maintained at a constant surface temperature of TC, and the air mass flow rate is m kg/s. Determine:
a. The heat transfer rate from the warmed air to the duct.
b. The air outlet temperature.
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take mass flow rate 045 mslength l 7 mhw 025 mti 38c ts 20c warmed air at 1 atm and tc enters an l m long rectangular duct with a cross section of h x wh w the duct is maintained at a consta 57036

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University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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Take mass flow rate = 0.45 m/s Length (L) = 7 m H = W = 0.25 m Ti = 38°C; Ts = 20°C Warmed air at 1 atm and TC enters an L-m long rectangular duct with a cross-section of H x W (H = W). The duct is maintained at a constant surface temperature of TC, and the air mass flow rate is m kg/s. Determine: a. The heat transfer rate from the warmed air to the duct. b. The air outlet temperature.
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Transcript

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00:01 In this question we have to find magnitude and the direction of the heat transfer.
00:05 So first for the given information we can find the stagnation temperature at the entrance t -01 from this equation when we know t1 and the mark number at station 1, m1.
00:26 And t01 will be 540 degree r and so from mark number of 2, t01 or t0 star is 0 .734 and then we have that t0 star will be 0 .79.
00:52 Sorry, it has to be 680 .6r...
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