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<li class="toctree-l1"><a class="reference internal" href="chap1_balanceEquations_Chap.html">1. Balance equations</a></li>
<li class="toctree-l1"><a class="reference internal" href="chap2_thermMachinesBasics_Chap.html">2. Thermal machines: Basics</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">3. Compression / Expansion of Gas and vapors</a><ul>
<li class="toctree-l2"><a class="reference internal" href="chap3_1Transformations.html">3.1. Compressions/Expansions</a></li>
<li class="toctree-l2"><a class="reference internal" href="chap3_2Optimisation.html">3.2. Optimisation of Compression/Expansion</a></li>
<li class="toctree-l2"><a class="reference internal" href="chap3_3Overview.html">3.3. Overview of comp/exp systems</a></li>
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<li class="toctree-l1"><a class="reference internal" href="chap4_ThermalEngines_Chap.html">4. Heat engines</a></li>
<li class="toctree-l1"><a class="reference internal" href="chap5_ThermalGenerators_Chap.html">5. Heat pumps and refrigerators</a></li>
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<h1><span class="section-number">3. </span>Compression / Expansion of Gas and vapors<a class="headerlink" href="#compression-expansion-of-gas-and-vapors" title="Permalink to this headline">¶</a></h1>
<p>In applications of thermodynamics to thermal machines, compressions and expansions of gases is of fundamental importance. These transformations occur in compressor, turbines, internal combustion engines, etc.
Transformations in such machines are <em>irreversibles</em>, and the calculs are always performed thanks to associated reversible transformation and corresponding <strong>efficiencies</strong> often obtained thanks to manufacturer’s data.</p>
<p>In this section:</p>
<blockquote>
<div><ul>
<li><p>We make a review on the different kind of compressions and expansions of gases (isothermal, polytropic, isentropic) and their impact on the technical work.</p></li>
<li><p>We study the way of optimisation of such transformations.</p></li>
<li><p>We present the a brief description of the main elements that can perform compressions or expansions of a compressible fluid:</p>
<blockquote>
<div><ul class="simple">
<li><p><strong>Volumetric compressors</strong>: including <em>reciprocating compressors</em> (present in refrigerators or heat pumps) and <em>rotating compressors</em>.</p></li>
<li><p><strong>Dynamic compressors</strong>: contains a rotary mechanical device (rotor) that increase fluid pressure continuously. This is the case of <em>ventillators</em>, <em>centrifugal compressors</em> or <em>axial compressors</em>.</p></li>
<li><p><strong>Turbines</strong>: also contains a rotor that provide a work from decresing the fluid pressure continuously. We talk about <em>impulse turbine</em> or <em>reaction turbine</em>.</p></li>
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<p class="caption"><span class="caption-text">Contents:</span></p>
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<li class="toctree-l1"><a class="reference internal" href="chap3_1Transformations.html">3.1. Compressions/Expansions</a></li>
<li class="toctree-l1"><a class="reference internal" href="chap3_2Optimisation.html">3.2. Optimisation of Compression/Expansion</a></li>
<li class="toctree-l1"><a class="reference internal" href="chap3_3Overview.html">3.3. Overview of comp/exp systems</a></li>
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