Liquid water at 60bar and 250C passes through an adiabatic expansion valve, emerging at a pressure P and temperature T1 If P is low enough, some of the liquid evaporates (a) If P f 1 0 bar, determine the temperature of the final mixture (T f ) and the fraction of the Liquid feed that evaporates (y v ) by writing an energy balance about the valve and neglecting E k (b) If you took E k into account in part (a), how would the calculated outlet temperature compare with the value you determined What about the calculated value of yv Explain (c) What is the value of P above which no evaporation would occur (d) Sketch the shapes of plots of T f versus P f and y v versus P f for 1 bar P f 60 bar Briefly explain your reasoning

Question: Liquid water at 60bar and 250C passes through an adiabatic expansion valve, emerging at a pressure P and temperature T1. If P is low enough,

Liquid water at 60bar and 250°C passes through an adiabatic expansion valve, emerging at a pressure P and temperature T1. If P is low enough, some of the liquid evaporates.

(a) If P_f = 1.0 bar, determine the temperature of the final mixture (T_f) and the fraction of the Liquid feed that evaporates (y_v) by writing an energy balance about the valve and neglecting ΔE_k.

(b) If you took ΔE_k into account in part (a), how would the calculated outlet temperature compare with the value you determined? What about the calculated value of yv? Explain.

(d) Sketch the shapes of plots of T_f versus P_f and y_v versus P_f for 1 bar < P_f < 60 bar. Briefly explain your reasoning.

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a Isaturation 10 bar 996 C If 996C HO 10 bar satd 4175 kJ kg 26754 kJ kg HO 60 bar 250C 10858 kJkg ... View full answer

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