Reconsider Prob. 889. Using EES (or other) software investigate

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September 9, 2020
Explain the ethical issues faced by the organization, summarize the legal and regulatory issues faced by the organization, and then summarize the organization’s corporate social responsibility.
September 9, 2020

Reconsider Prob. 889. Using EES (or other) software investigate

Reconsider Prob. 889. Using EES (or other) software investigate the effect of air velocity and the surface emissivity on the exit temperature of air and the rate of heat loss. Let the air velocity vary from 1 m/s to 10 m/s and the emissivity from 0.1 to 1.0. Plot the exit temperature and the rate of heat loss functions of the air velocity and emissivity and discuss the results. Problem. 889 Hot air at 60C leaving the furnace of a house enters a 12-m-long section of a sheet metal duct of rectangular cross section 20 cm 20 cm at an average velocity of 4 m/s. The thermal resistance of the duct is negligible and the outer surface of the duct whose emissivity is 0.3 is exposed to the cold air at 10C in the basement with a convection heat transfer coefficient of 10 W/m2K. Taking the walls of the basement to be at 10C also determine (a) the temperature at which the hot air will leave the basement and (b) the rate of heat loss from the hot air in the duct to the basement. Evaluate air properties at a bulk mean temperature of 50C. Is this a good assumption?


 

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