- #1
racnna
- 40
- 0
It is thought that people develop respiratory infections during air travel because much of the airplane cabin air is recirculated. Airiines claim that using only fresh air in the cabins is too costly since at an altitude of 30 000 feet the outside conditions are -50°C and 0.1 bar, so that the air would have to be compressed and heated before being introduced into the cabin. The airplane cabin has a volume of 100 [tex]m^3[/tex] with air at the inflight conditions of 25°C and 0.8 bar. What would be the cost of completely refreshing the air every minute
if air has a heat capacity of C; = 30 J/(mol K) and energy costs, $0.2 per kW hr?
Im using the energy balance
[tex]\frac{dU}{dt}=\frac{dN}{dt} H +Q +W[/tex]
i have done the derivation but the expression is complicated so i wanted to see what you guys come up with
if air has a heat capacity of C; = 30 J/(mol K) and energy costs, $0.2 per kW hr?
Im using the energy balance
[tex]\frac{dU}{dt}=\frac{dN}{dt} H +Q +W[/tex]
i have done the derivation but the expression is complicated so i wanted to see what you guys come up with