Question

Question 4 a. A vessel contains a gaseous mixture of composition by volume 80% H2, and 20% CO. It is desired that the mixture should be made in the proportion 50% H2 and 50% CO by removing some of the mixture and adding some Co. Calculate, per kilomole of mixture, the mass of mixture to be removed and the mass of CO to be added. The pressure and temperature in the vessel remain constant during the process. Take the molar mass of H2 and CO as 2 kg/kmol and 28 kg/kmol, respectively. Hint: Since pressure, temperature, and volume did not change, the amount of substance (number of kilomoles) must remain the same throughout. b. Air enters a cooling section of 40-cm-diameter at 1 atm, 32°C, and 30 percent relative humidity at 18 m/s. Heat is removed from the air at a rate of 1200 kJ/min. Determine: a. the exit temperature b. the exit relative humidity of the air, and the exit velocity

Answer 1

According to our guidelines,we should answer only one question..So I choose second question to solve....

12.00k5lmin 32°C 30-1 lulu 18m/s 1atm flow As it was Steady Mass flow rate of process dry air in the total remains Constant Process mar mazzmaz From Ghart psychro rometric At 32°C, 30-4 h = 55 kJ/kg dry air W, = 0.0 08.9 kg of H₂O o lugday air Vi 0.877 milung #xy qix Mass Flow rate of dry air through the cooling seltion XVI XA, m = 1 VI Scanned by TapScanner

x 18% 7x 0.4 3.877 u ma 2.5869/ balance e in Cooling From energy section @i na Chah) out => -1200/60 2-58 cm -55) h2 = 47.2k5/kg dry air. air is fixed Exit state of From psychrometric chart T2 = 24.4°C 02-46-6/ U2 = 0.856 m Ing dry air Exit Velocity mar maz W2 Vi V2=17.6 => mis Uz => V2= 23 W z XV=> 01356 x 18 0.877 Scanned by TapScanner