Consider a rigid system containing water at 22 bars and 375°C: (1) Determine the phase at this condition, why? (2) Determine the specific volume under this condition. (3) If the system is cooled to a temperature of 195 o C at the new thermal equilibrium condition, what is the quality and enthalpy?

Question

Conor

Engineering

10 January, 19:33

Consider a rigid system containing water at 22 bars and 375°C: (1) Determine the phase at this condition, why? (2) Determine the specific volume under this condition. (3) If the system is cooled to a temperature of 195 o C at the new thermal equilibrium condition, what is the quality and enthalpy?

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Answers (1)

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Andy · Answer 1

Answer and Explanation:

considering a rigid system

fixed volume V = C

water at P1=22bar and T1=375ºC

at 22 bar Tsat = 217.2ºC

so ...

T1>Tsat

thus

Steam is superheated (phase at this condition)

Specific Volume, V1

V1 = Vg * [ Tsup/Tsat]

V1 = 0.090663 * ((375+273) / (217.2+273))

V1 = 0.1198 m³/kg (specific volume under this condition)

V=C, T2=195ºC

from Mollier Diagram we have that ...

P2 = 6bar (quality and enthalpy)

h2 = 2840 KJ/kg

Superheated Steam