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B. A hair dryer operates with 1600 W of energy supplied to the electric resistance element. While the air is pulled into the hair
B. A hair dryer operates with 1600 W of energy supplied to the electric resistance element. While the air is pulled into the hair dryer by a small fan to flow across the resistor, ignore the power consumed by the fan. In steady state operation the inlet conditions from the room air are p=101 kPa and T=298K and the inlet area is large enough to ignore the inlet velocity of the air. Measurements at the exit which has an area of 60 cm indicate the air pressure remains p=101 kPa, with a temperature of T=50.2C and velocity=9.36 m/s. 3. (12 pts) In B, what is the mass flow rate of air? 4. (20 pts) In B, how much energy appears as heat transfer to the room during the operation of this hair dryer Q = m = kg/s kJ/s
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