Problem $1$ R$-134$a flows through a throttle valve, it enters at $25C,750$kPa with negligible

kinetic energy and exits with a pressure of $165$ kPa $.$

$1$A$)$ Identify the phase at the inlet, and find the enthalpy and specific volume.

$1$B$)$ Identify the phase at the exit, if it is in saturated state, find the quality $x.$ In addition, find the

temperature and specific volume.

$1$C$)$ Find the ratio of exit pipe diameter to that of the inlet pipe $(\frac{D_{ex}}{D_{in}})$ so the average velocity

stays constant.