Question

02) Consider a hydrostatic system represented by the thermodynamic variables volume V, pressure P and temperature T. A) A hydrostatic system undergoes a phase transition from first order to temperature To = 300 K and pressure Po = 1 x 100 Pa. In this case, it is verified that the variation of the specific volume of the system Av = 2 x 10 m3/Kg and the variation of the enthalpy specific Ah = 60 KJ/Kg. Determine the variation of the specific entropy for this phase transition. Determine the temperature Tl of the transition if it occurs at a pressure Pi = 1 x 10% Pa. Indicate the hypothesis considered in this second case.

Answer 1

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AS = Ah T A 2 60 300 = 0.2 kJ/kgk This is for phase change. *Here, temperature will be constant because of first order transition. Pressure f temperature both will not change in phase transition. can prove by clausius. clapey con en ) = A ( 1 / 2 - 4 Here P2=P, (given) So, Tz =T, This you