## Related questions with answers

A closed, rigid tank contains Refrigerant 134a, initially at $100^{\circ} \mathrm{C}$. The refrigerant is cooled until it becomes saturated vapor at $20^{\circ} \mathrm{C}$. For the refrigerant, determine the initial and final pressures, each in bar, and the heat transfer, in kJ/kg. Kinetic and potential energy effects can be ignored.

Solution

Verified$\rule{430pt}{1pt}$

$\text{\textcolor{#4257b2}{\textbf{Given}}}$

-Refrigerant 134 a.

-constant specific volume process $v=C$.

$\text{\textcolor{Brown}{The first state}}$.

-The temperature $T_1=100\ \mathrm{\text{\textdegree} C}$.

-Super heated.

$\text{\textcolor{Brown}{The second state}}$.

-The quality $x_2=1$.

-The temperature $T_2=4\ \mathrm{\text{\textdegree} C}$.

$\text{\textcolor{#4257b2}{\textbf{Required}}}$

-The initial pressure $P_1$ in $\mathrm{bar}$.

-The final pressure $P_2$ in $\mathrm{bar}$.

-The heat transferred $q$ in $\mathrm{kJ/kg}$.

$\text{\textcolor{#4257b2}{\textbf{Assumption}}}$

-The system is in equilibrium at each state.

-Kinetic and potential energy are neglected.

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