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<p>Albert,</p>
<p> Thermal mass is definitely considered by Type56. Sometimes
highly thermally massive walls cause problems for the algorithm
that computes the transfer functions for the walls and one of the
workarounds that people use is to define the wall as having an
R-value only (i.e. no thermal mass). If you had to make that
simplification for your rammed earth walls it would explain why
you are not seeing the impact of the thermal mass. It also occurs
to me that if the time delay caused by the thermal mass is <i>almost</i>
but not quite 24 hours then it could look as though the lag was
negative.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 01/26/2021 07:52, Albert Cavero
Carreras via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:PA4PR04MB8047675B49E3B542262DDA6B8ABC0@PA4PR04MB8047.eurprd04.prod.outlook.com">
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<span style="margin:0px;font-size:12pt">Hello,</span></div>
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font-size: 12pt; color: rgb(0, 0, 0);">
<div style="margin:0px;font-size:12pt"><br>
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<div style="margin:0px;font-size:12pt">I am doing a comparison
between a conventional building and another with the external
walls made of rammed earth, which has a big thermal mass. I
have simulated both of the with the Type56 in Simulation
Studio and I have obtained this results. I do not know why but
the decrement factor is the same for both constructions and
the thermal lag is negative. I have simulated it during summer
and during winter time and also I haven't considered
ventilation or any time of heating or cooling. I have already
seen some emails in your webpage from people asking if the
thermal mass is considered in the type56. </div>
<div style="margin:0px;font-size:12pt"><br>
</div>
<span style="margin:0px;font-size:12pt">Thank you,</span><br>
</div>
<br>
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<pre class="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
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<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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