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# Refrigerant 134a initially at $-36^{\circ} \mathrm{C}$ fills a rigid vessel. The refrigerant is heated until the temperature becomes $25^\circ C$ and the pressure is 1 bar. There is no work during the process. For the refrigerant, determine the heat transfer per unit mass and the change in specific exergy, each in kJ/kg. Comment. Let $T_{0}=20^{\circ} \mathrm{C}, p_{0}=0.1 \mathrm{MPa}.$

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

Reference temperature $T_0=20 \ \mathrm{^\circ C}$

Reference pressure $P_0=0.1 \ \mathrm{MPa}$

Intial temperature $T_1=-36 \ \mathrm{^\circ C}$

Final temperature $T_2=25 \ \mathrm{^\circ C}$

Final pressure $P_2=1 \ \mathrm{bar}$

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

Determine the heat transfer per unit mass and the change in specific exergy, each in $\left[ \ \mathrm{\dfrac{kJ}{kg}} \right]$

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

Kinetic energy effect is neglected.

Potential energy effect is neglected.

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