Problem 10-10
A mixture of 40 percent argon and 60 percent hydrogen by volume has been
proposed for use as the working fluid in a closed Brayton cycle. The
mixture is compressed isentropically from 40 oC
at 0.4 x 106 N/m2
to a pressure of 1.2 x 106 N/m2. Find the final temperature of the mixture and the work required, assuming perfect-gas behavior is applicable. |
Problem 10-13
One tank contains 2 kg of methane at 2 atm, 10 oC.
Another tank contains 4 kg of oxygen at 6 atm, -10 oC.
A valve between the tanks is opened, and the gases mix adiabatically.
Find the final mixture temperature and pressure.
Answer: Tf = 274.5 K,
P = 2.96 atm
Problem 10-41
Atmospheric air at 90 oF and 50
percent relative humidity is to be conditioned to 70 oF
at 35 percent relative humidity using a cooling coil section, a condensate
removal section, and a reheat section. The air-flow is 350 lbm/hr. At 1
atm find the mass of water removed and the heat transfers.
Answer: mH2O = 3.38 lbm/hr,
Qcool = 7910 Btu/hr,
Qheat = 2485 Btu/hr,
Problem 10-61
A cooling water tower is used to cool water from 100 oF
to 75 oF at a water-flow rate of
200,000 lbm/hr. The air enters the bottom of the tower at 60 oF
with a relative humidity of 50 percent and leaves the top at 90 oF,
saturated. Find the air-flow rate and the makeup water required.
Answer: ma = 142286 lbm/hr,
mmu = 3557 lbm/hr