QUESTION 3a) During a cold winter day, wind at 55 km/h is blowing parallel to a 4-m-high and10-m-long wallof a house. If the air outside is at 5 °C and the surface temperature of the wall is 12 °C, determinethe rate of heat loss from that wall by convection.b) A 0.4-W cylindrical electronic component shown in Figure Q3b with diameter 0.3 cm and length1.8 cm is mounted on a circuit board is cooled by air flowing across it at a velocity of 150 m/minand temperature is 40 °C. Take the pressure of air 1 atm and the film temperature to be 50 °C,determine the surface temperature of the component.Resistor0.4 WD = 0.3 cmFigure Q3b

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QUESTION 3 a) During a cold winter day, wind at 55 km/h is blowing parallel to a 4-m-high and 10-m-long wall of a house. If the air outside is at 5 °C and the surface temperature of the wall is 12 °C, determine the rate of heat loss from that wall by convection.

QUESTION 3 a) During a cold winter day, wind at 55 km/h is blowing parallel to a 4-m-high and 10-m-long wall of a house. If the air outside is at 5 °C and the surface temperature of the wall is 12 °C, determine the rate of heat loss from that wall by convection.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.4P: An electrical transmission line of 1.2-cm diameter carries a current of 200 amps and has a...

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During a cold winter day, wind at 55 km/h is blowing parallel to a 4m high and 10m long wall of a house. If the air outside is at 5 degrees Celsius and the surface temperature of the wall is 12 degrees Celsius , determine the rate of heat loss from the wall by convection. What would your answer be if the wind velocity has doubled? From Table A-1:thermal conductivity, k = 0.0246 W/m degrees Celsiusviscosity, v = 1.4 x 10^-5 m^2/sPrandtl no. Pr = 0.717
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