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Air at atmospheric pressure and 20°C flows with 6 m/s velocity through main trunk duct of air conditioning system. The duct is rectangular in cross-section and measures 40 cm x 80 cm. Determine heat loss rate (in W) per meter length of duct corresponding to unit temperature difference. The relevant thermo-physical properties of air are
v = 15 x 10-6 m2/s
α = 7.7 x 10-2 m2/hr
and k = 0.026 W/m-°C 
Given Nu = 0.023 Re0.8 Pr0.4  
    Correct answer is between '42.0,43.0'. Can you explain this answer?
    Verified Answer
    Air at atmospheric pressure and 20°C flows with 6 m/s velocity thr...
    For the rectangular duct, characteristic length is

    Obviously the flow is turbulent and corresponding Nusselt number is given as
    View all questions of this test
    Most Upvoted Answer
    Air at atmospheric pressure and 20°C flows with 6 m/s velocity thr...
    °C has a density of approximately 1.204 kg/m³.
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    Air at atmospheric pressure and 20°C flows with 6 m/s velocity through main trunk duct of air conditioning system. The duct is rectangular in cross-section and measures 40 cm x 80 cm. Determine heat loss rate (in W) per meter length of duct corresponding to unit temperature difference. The relevant thermo-physical properties of air arev = 15 x 10-6 m2/sα = 7.7 x 10-2 m2/hrand k = 0.026 W/m-°CGiven Nu = 0.023 Re0.8 Pr0.4Correct answer is between '42.0,43.0'. Can you explain this answer?
    Question Description
    Air at atmospheric pressure and 20°C flows with 6 m/s velocity through main trunk duct of air conditioning system. The duct is rectangular in cross-section and measures 40 cm x 80 cm. Determine heat loss rate (in W) per meter length of duct corresponding to unit temperature difference. The relevant thermo-physical properties of air arev = 15 x 10-6 m2/sα = 7.7 x 10-2 m2/hrand k = 0.026 W/m-°CGiven Nu = 0.023 Re0.8 Pr0.4Correct answer is between '42.0,43.0'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Air at atmospheric pressure and 20°C flows with 6 m/s velocity through main trunk duct of air conditioning system. The duct is rectangular in cross-section and measures 40 cm x 80 cm. Determine heat loss rate (in W) per meter length of duct corresponding to unit temperature difference. The relevant thermo-physical properties of air arev = 15 x 10-6 m2/sα = 7.7 x 10-2 m2/hrand k = 0.026 W/m-°CGiven Nu = 0.023 Re0.8 Pr0.4Correct answer is between '42.0,43.0'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Air at atmospheric pressure and 20°C flows with 6 m/s velocity through main trunk duct of air conditioning system. The duct is rectangular in cross-section and measures 40 cm x 80 cm. Determine heat loss rate (in W) per meter length of duct corresponding to unit temperature difference. The relevant thermo-physical properties of air arev = 15 x 10-6 m2/sα = 7.7 x 10-2 m2/hrand k = 0.026 W/m-°CGiven Nu = 0.023 Re0.8 Pr0.4Correct answer is between '42.0,43.0'. Can you explain this answer?.
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