4.89 Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 24°C and exits at 1 bar. If the refrigerant undergoes a throttling process, what is the quality of the refrigerant exiting the expansion valve?
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Ammonia enters the expansion valve of a refrigeration system at a pressure of $1.4 \mathrm{MPa}$ and a temperature of $32^{\circ} \mathrm{C}$ and exits at $0.08 \mathrm{MPa}$. If the refrigerant undergoes a throttling process, what is the quality of the refrigerant exiting the expansion valve?
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