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<p>which also models hot air engines.</p>

<p><a href="page.php?w=Image%3AStirling_Cycle.png">class=skin-invert-image</a>For example :--the pressure-volume <a href="page.php?w=mechanical_work">mechanical work</a> output from the ideal Stirling cycle (net work out), consisting of 4 thermodynamic processes, is:<br/>
:<br/>
:<br/>
:<br/>
:<br/>
:For the ideal Stirling cycle, no volume change happens in process 4-1 and 2-3, thus equation (3) simplifies to:<br/>
:</p>

<p><big>Heat pump cycles</big></p>
<p>Thermodynamic heat pump cycles are the <a href="page.php?w=Mathematical_model">model</a>s</p><p>
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