Measurements during steady state operation indicate that warm air exits a hand held hair dryer at a

Question:

Measurements during steady state operation indicate that warm air exits a hand held hair dryer at a temperature of 90oC with a velocity of 10 m/s through an area of 20 cm3. Air enters the dryer at 25oC, 100 kPa with a velocity of 3 m/s. No significant change in pressure is observed. Also, no significant heat transfer between the dryer and its surroundings occurs. Determine
(a) The external power and
(b) The exegetic efficiency. Let T0 = 25o, p0 = 1 atm. Use the PG model.