Question

QUESTION 9 For a simple ideal Rankine cycle with fixed boiler and condenser pressures, reheating may reduce the amount of heat rejected. the turbine's work output. the moisture content at turbine exit. the pump work input. the amount of heat input. QUESTION 10 One room is filled with a mixture of O2 and H2 (assumed to be ideal gases) at 130 kPa. If the mass fraction of O2 is 95%, what is the partial pressure of O2? (in kPa) 65 0 71 054 076 81 QUESTION 11 Ethane is burned with air steadily in a combustor. If the flow rate of ethane is 8 kg/s and the excess air is set to 25%, determine the air flow rate (in kg/s),

Answer 1

9. Reheating reduces the

" the moisture content at the turbine exit. "

o C | 6x29]mo) H2 = 162 g/m2 = 32g mil 2g/mol 2 E mass fraction - 20.95 no H₂ mass fraction 20:05 0-95 0.02968 moles of 2 32 0:05 moles of H = 20.025 2. nos mole fraction of xq пт '0002968 X Xoz [0-02968+0.025 nod =Pg 130 x 0.9428 Poz = 70.56 kpa [~ 71 kpal tor = 0.54279