Question

Water vapor is cooled in a closed, rigid tank from T₁ = 400°C and p₁ = 100 bar to a final temperature of T₂ = 320°C.

Determine the final specific volume, v₂, in m³/kg, and the final pressure, p₂, in bar.

Answer 1

(a)

Using Table A-4 (Superheated water);

• at P₁ = 100 bar and T₁ = 400^oC

v₁ = 0.02641 m³/kg

For a closed and rigid cylinder, the volume remains constant;

v₂ = v₁ = constant

=> v₂ = 0.02641 m³/kg

...(Answer)

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(b)

Using Table A-4 (Superheated water);

• at T₁ = 320^oC and v₂ = 0.02641 m³/kg, by interpolating between 80 bar and 100 bar;

...(Answer)