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<p style="margin-top:0;margin-bottom:0">Hello David </p>
<p style="margin-top:0;margin-bottom:0"><br>
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<p style="margin-top:0;margin-bottom:0">Thank you so much for the clear explanation. I will contact you directly to know more about the lithium-ion battery component. </p>
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<p style="margin-top:0;margin-bottom:0">Best Regards </p>
<p style="margin-top:0;margin-bottom:0">Gokula </p>
<p style="margin-top:0;margin-bottom:0">PolyU</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> David BRADLEY <d.bradley@tess-inc.com><br>
<b>Sent:</b> Tuesday, April 30, 2019 12:00:50 AM<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding.org<br>
<b>Cc:</b> SENTHIL KUMAR, gokula [Student]<br>
<b>Subject:</b> Re: [TRNSYS-users] Battery - type47a</font>
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<p>Gokula,</p>
<p> I have a Li-ion battery model written; it is planned for eventual release in the TESS Libraries but there is not yet a timeline. From my experience, I would say that Type47 is not very good for modeling Li-ion batteries. The current/voltage characteristic,
especially close to the fully-charged point of a Li-ion battery is quite different than it is for a lead-acid battery.
<br>
</p>
<p> If you are getting energy balance problems with Type47 and higher rates of charge/discharge, one thing I would look at is whether the energy balance improves when you shorten the time step.</p>
<p> The development schedule for the actual Li-ion battery model could be moved up and the model could be available as an individual component in the near term. Please contact me directly if you are interested.</p>
<p>kind regards,</p>
<p> David</p>
<p> <br>
</p>
<div class="x_moz-cite-prefix">On 04/28/2019 22:52, SENTHIL KUMAR, gokula [Student] via TRNSYS-users wrote:<br>
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<p style="margin-top:0; margin-bottom:0"><span style="">Hello Trnsys Users </span></p>
<p style="margin-top:0; margin-bottom:0"><span style=""><br>
</span></p>
<p style="margin-top:0; margin-bottom:0"><span style=""></span><span style="">In the description of the battery(Type-47a), it is written that ''</span><span style=""><i>This model of a lead-acid storage battery operates in conjunction with solar cell array
and power conditioning components. It specifies how the battery state of charge varies over time, given<span style="background-color:rgb(255,255,255)"> </span><span style="background-color:rgb(255,255,255)"><span style="background-color:rgb(255,255,0)">the
rate of charge or discharge</span>. </span><span style="background-color:rgb(255,255,255)">T</span>his proforma corresponds to Mode 1, based on a simple energy balance of the battery. The power is simply taken as input. This model does not calculate nor output
any values of current or voltage.''</i> It seems that the component type-47a is developed based on the charging/discharge rate of lead-acid battery, usually, it is low. From the simulation, I experienced that the error percentage in Energy Balance increases
when increasing the charging/discharging rate. I also read the Trnsys forum, there it is mentioned that the Type-47a is not suitable for lithium-ion battery, but it was written many years before.</span><br>
</p>
<p style="margin-top:0; margin-bottom:0"><span style=""><br>
</span></p>
<p style="margin-top:0; margin-bottom:0"><span style="">Please explain, whether the type47a is suitable to do the function of a lithium-ion battery. If not, please suggest a suitable component type for that. </span></p>
<p style="margin-top:0; margin-bottom:0"><span style=""><br>
</span></p>
<p style="margin-top:0; margin-bottom:0"><span style="">Thanking </span></p>
<p style="margin-top:0; margin-bottom:0"><b>Gokula</b> Manikandan Senthil Kumar </p>
<p style="margin-top:0; margin-bottom:0">Ph.D. Student </p>
<p style="margin-top:0; margin-bottom:0">Department of Building Services Engineering </p>
<p style="margin-top:0; margin-bottom:0">The Hong Kong Polytechnic University</p>
<p style="margin-top:0; margin-bottom:0"><span style=""><br>
</span></p>
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<pre class="x_moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="x_moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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