Question

3. A stream at 150 °C and 0.8 atm absolute consisting of 10 mole% methanol vapour in air flows into a condensor at a flowrate of 200 L/s. 90% of the entering methanol is condensed, and both the liquid and gas outlet streams are in equilibrium at 0 °C and 5 atm. Shaft work is delivered to the system at a rate of 30 kW in order to achieve the compression from 0.8 to 5 atm. (a) Calculate the mass fraction of methanol in the exit gas stream; air can be assumed to have an average molecular weight of 29.0. [5 marks] (b) Calculate the rate (kW) at which heat must be removed from the condensor. [20 marks]

          3. A stream at 150 °C and 0.8 atm absolute consisting of 10 mole% methanol vapour in
air flows into a condensor at a flowrate of 200 L/s. 90% of the entering methanol is
condensed, and both the liquid and gas outlet streams are in equilibrium at 0 °C and 5
atm. Shaft work is delivered to the system at a rate of 30 kW in order to achieve the
compression from 0.8 to 5 atm.
(a) Calculate the mass fraction of methanol in the exit gas stream; air can be assumed
to have an average molecular weight of 29.0. [5 marks]
(b) Calculate the rate (kW) at which heat must be removed from the condensor. [20
marks]

$3. A stream at 150 °C and 0.8 atm absolute consisting of 10 mole% methanol vapour in air flows into a condensor at a flowrate of 200 L/s. 90% of the entering methanol is condensed, and both the liquid and gas outlet streams are in equilibrium at 0 °C and 5 atm. Shaft work is delivered to the system at a rate of 30 kW in order to achieve the compression from 0.8 to 5 atm. (a) Calculate the mass fraction of methanol in the exit gas stream; air can be assumed to have an average molecular weight of 29.0. [5 marks] (b) Calculate the rate (kW) at which heat must be removed from the condensor. [20 marks]$

Added by Jeffery B.

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