Air at 80 and 14.5 psia flows into a hair dryer and is heated by an electrical heating element. Hot air at 176 leaves the dryer through a 2 inch diameter outlet at a volume flow rate of 1.51 ft3/s after undergoing an adiabatic process at constant pressure. What is electric power input to the dryer, in kW? Assume negligible air velocity entering the dryer. For air, cp = 0.24 Btu/lbm, and specific gas constant R = 53.35 Btu/lbm. Conversions: 1 lbf = 32.2 lbmft/s2, 1 kWh = 3412 Btu

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We can start by finding the mass flow rate of the air using the ideal gas law and the continuity equ... View the full answer