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<body class='hmmessage'><div dir='ltr'>Dear all, <br><br>I have a question about the H2 electrolyzer model Type160. <span lang="EN-US">Shortly: Will the Faraday loss of the
electrolyzer be converted into heat in the electrolyzer?</span>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">In the electrolyzer model (Type 160 written by Ulleberg) [1], there are three
efficiencies: eta_e, eta_F, and eta_tot:</span></p>
<p class="MsoNormal"><span lang="EN-US">“eta_e” is the energy efficiency of
electrolyzer without considering any Faraday loss, i.e. the maximum theoretical
proportion of the electricity which can be covered to the hydrogen energy
content.</span></p>
<p class="MsoNormal"><span lang="EN-US">“eta_F” is the Faraday efficiency: it is
the ratio of the real final produced H2 energy content to the theoretical maximum
produced H2 energy content.</span></p>
<p class="MsoNormal"><span lang="EN-US">“eta_tot” is the total efficiency of the
electrolyzer: it is equal to “eta_e*eta_F”, and thus is the ratio of the final
produced H2 energy content to the electricity consumed in the electrolyzer.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">In Ullerberg’s model [1] (TRNSYS Type 160),
the heating generated by the electrolyzer is calculated by the P_ely*(1-eta_e),
which hasn’t taken the Faraday loss into account. However, according to the
energy balance, the Faraday loss must be somewhere, which mostly in the form of
heat, so I doubt why the Faraday loss hasn’t been taken into account in the
thermal part of the electrolyzer model.<br></span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Reference [1]: Øystein Ulleberg, Modeling
of advanced alkaline electrolyzers: a system simulation approach, International
Journal of Hydrogen Energy, Volume 28, Issue 1, January 2003, Pages 21-33. <a href="http://www.sciencedirect.com/science/article/pii/S0360319902000332">http://www.sciencedirect.com/science/article/pii/S0360319902000332#</a></span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you very much.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Kind Regards,</span></p>
<p class="MsoNormal"><span lang="EN-US">Sunliang Cao<br></span></p><p class="MsoNormal"><span lang="EN-US"> </span></p>
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