Engineering, 05.03.2021 02:00, Nathaliasmiles

A building with an internal volume of 400 m3is to be heated by a 30-kW electric resistance heater placed in the duct inside the building. Initially, the air in the building is at 14°C, and the local atmospheric pressure is 95 kPa. The building is losing heat to the surroundings at a steady rate of 450 kJ/min. Air is forced to flow through the duct and the heater steadily by a 250-W fan, and it experiences a temperature rise of 5°C each time it passes through the duct, which may be assumed to be adiabatic. Determine the average mass flow rate of air through the duct.

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A building with an internal volume of 400 m3is to be heated by a 30-kW electric resistance heater pl...