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Sunliang,<br>
In the Type160 code, the equation for the heat generated by the
electrolyzer is qGen = nCells*Iely*(Vcell-Vtn)<br>
<br>
where Iely is the electrolyzer current, Vcell is the cell voltage
and Vtn is the thermoneutral cell voltage. The Faraday efficiency is
computed from:<br>
<br>
eta_f = idensity**2/(a1+idensity**2)*a2<br>
<br>
where idensity is the current density of the cells (Iely/Acell)<br>
<br>
I think that both the Faraday efficiency and the heat generated are
a result of the computation of the cell voltage and the stack
current. Therefore I think that the heat generation is correctly
computed and that the confusion may be in the definition of the
energy efficiency and the total energy efficiency.<br>
Kind regards,<br>
David<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 11/20/2014 07:36, SUNLIANG CAO
wrote:<br>
</div>
<blockquote cite="mid:BLU175-W45E0EEBB18F8FC916E5AB3AD760@phx.gbl"
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<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 moz-do-not-send="true"
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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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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