Answer to Question #313365 in Chemical Engineering for abraar

Question

A tank of volume 0.00354 m³ contains 0.00292 kg of saturated water vapour at 0.143 MPa. A line is attached to the tank in which water vapour flows at 0.7 MPa and 200 °C. Steam from this line enters the tank until the pressure in the tank is 0.7 MPa.

 

 

                             i)     Why can this process be analysed as uniform flow?

[2 marks]

 

ii) State THREE assumptions, other than uniform flow, that must be made when analysing this process.

[3 marks]

ii)              Use the mass balance to write an expression for the final mass of steam, m₂, in the tank.

[2 marks]

iii)            Write an expression for the energy balance for the system based on the assumptions made in part (ii) and calculate the mass of steam that enters the tank. The properties of steam under these conditions are:

h_in = 2845.3 kJkg^-1 u₁ = 2517.6 kJkg^-1 and u₂ = 2749.9 kJkg^-

1

[5 marks] v) Predict and explain what would happen to the temperature of the steam in the tank during this process.

[3 marks] 

Answer 1

Answer is given below