Question $3$

An air$-$standard cycle with constant specific heats at room temperature is executed in a

closed system with $0\mathrm{.}0035$ kg of air and consists of the following three processes:

$(1-2)v=$ Constant heat addition from $95$ kPa and $17C$ to $380$ kPa

$(2-3)$ Isentropic expansion to $95$ kPa

$(3-1)P=$ Constant heat rejection to initial state

The properties of air at room temperature are shown as:

$c_p=1\mathrm{.}005k\frac{J}{k}g*K$

$c_v=0\mathrm{.}718k\frac{J}{k}g*K$

$k=1\mathrm{.}4$

Complete the following:

A$.$ Show the cycle on P$-$v and T$-$s diagrams.

B$.$ Calculate the net work per cycle in kJ$.$

C$.$ Determine the thermal efficiency.