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<p>PJ,</p>
<p> The way that a staircase affects heat transfer in a building is
primarily through convection (air moving up and down the stair).
If the staircase in your house is closed off then you can best
model it as an airnode of its own that spans both floors of the
house. If the staircase is open then it becomes a bit more tricky.
The most correct way to approach it (in my opinion) is to add an
internal air flow model to your building model (using either
TRNFlow or CONTAM/Type97 or Type98). You can then define a
horizontal opening and the air flow model will try to compute the
amount of air that flows up or down through the stairway.</p>
<p> If you don't want to introduce the level of complexity of
interzonal airflow to the model then I would suggest putting a
(fake) floor in the middle of the stairway in Trnsys3d. Once you
get to TRNBuild you can define that fake floor as being a single
resistive-only material with a very very low thermal resistance. <br>
</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 05/17/2018 04:37, Pea Jy via
TRNSYS-users wrote:<br>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am a beginner in TRNSYS.<o:p></o:p></p>
<p class="MsoNormal">Currently working on the thermal modeling
of a double-storey house.
<o:p></o:p></p>
<p class="MsoNormal">I am using google sketchup to first
classify the zone. <o:p>
</o:p></p>
<p class="MsoNormal">My questions is, how do I model a staircase
in sketchup? And how do I define it after export it to trnbld?<o:p></o:p></p>
<p class="MsoNormal">Thanks. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards,<o:p></o:p></p>
<p class="MsoNormal">PJ <o:p></o:p></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>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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