A hand dryer blows heated air downwards out of the exit duct at a velocity of 4 in/s. The temperature and density of the ambient air at the inlet are 15 C and 1.23 kg/m ³ , while at the outlet it has temperature 35 C and density 1.15 kg/m ³ . The blower power is 10.0 W, and the heater power is 715 W. Consider the inlet to be at the large mass of ambient air which has negligible velocity

a) What is the pressure at the outlet?

b) You will be applying the energy equation. Why can you ignore any height differences in this situation?

c) If the specific heat of air C = 1000 J/(kg K), where Δû = C ΔT, find the change in internal energy per unit mass from the inlet to outlet.

d) Find the mass flow rate through the dryer.