QUESTION $2($PO$1,$ CO$1,$ C$2,$ C$4,$ C$4,$ C$5)$

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a$)$ By using a brief description, define; i$)$ saturated liquid, ii$)$ saturated liquid$-$vapor mixture, iii$)$ saturated vapor and iv$)$ superheated vapor.

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$(4$ marks$)$

b$)$ A $164$ L rigid vessel contains a $6\mathrm{.}53$ kg saturated liquid$-$vapor mixture of refrigerant $R134-a$ at $12$ C $.$ The refrigerant is now heated to the temperature of the vessel until all the liquid in the vessel is vaporised.

i$)$ Calculate the quality of refrigerant water at the initial state. $n=\frac{mg}{m_g+m_f}$

$(4$ marks$)$

ii$)$ Determine the final temperature of the refrigerant and show the process on a T$-$v $n_{\text{a}\text{v}\text{e}\text{n}\text{c}\text{e}}$ : $n_5$ diagram. $n{V}_{fs},T_1=120C,T_2=?$

c$)$ If the type of vessel in question $2($b$)$ is now changed into a frictionless piston$-$cylinder device, propose the changes in the pressure and specific volume as the heating occurs. Justify your answer. $($No calculation required$)$