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<p>the PCM can be contained in a vessel, and heat flow to and from the PCM can be controlled by pumping a heat transfer fluid through a <a href="page.php?w=heat_exchanger">heat exchanger</a>, generally immersed in the PCM within the vessel.  In this case the system is a sub-category of "thermal battery" or "TES", thermal energy storage, which encompasses sensible heat storage as well.</p>

<p><big> Classification of phase-change materials </big></p>
<p>Phase-change materials (PCMs) used for thermal energy storage are commonly classified according to their</p><p>
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