Water at 10°C and 81.4 percent quality is compressed
isentropically in a closed system to 3 MPa. How much work
does this process require in kJ/kg?

Respuesta :

The work done that the process is 1180.4kJ/kg.

How to solve the work done?

Temperature = 10°C

Quality fo steam = 84% = 0.84

Final pressure = 3MPa.

The internal energy at state 1 will be:

= 42.020 + 0.814(2346.6)

= 1952.2 kJ/kg

The internal energy at state 2 will be:

= 0.1511 + 0.814(8.7488)

= 7.2726 kJ/kg

From the superheated water, at P2 = 3MPa, the internal energy is 3132.6 kJ/kg. The work done will be:

= ∆U

= m(u2 - u1)jJ1180.4kJ/kg

= 3132.6 - 1952.2

= 1180.4kJ/kg

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