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<p>An EXTERNAL floor means that there are ambient conditions on the
back side of the floor of your zone. With an EXTERNAL surface,
you'll need to provide an orientation so that TRNSYS can determine
how much solar is incident on the back (outside the zone) surface.
Type56 will also assume that the temperature and RH of the air on
the back side of the surface are the ambient temperature and RH
provided to the model. Bear in mind that there is no inherent
meaning to "GROUND_FLOOR." That is just a name assigned to a
construction.</p>
<p>There are certainly buildings in which all or part of the bottom
floor is above some ambient conditions (perhaps there is an open
parking garage underneath or perhaps part of the building is
cantilevered. For this type of floor, you'd set the "view factor
to sky" to 0 because the back surface of the floor faces the
ground and doesn't "see" the sky for longwave radiation exchange.
Geosurf asks for the fraction of the beam solar radiation that
makes it into the zone that strikes the floor. If your zone is
large with relatively few windows you can set that value to 1
thereby assuming that all the beam radiation causes sun patches on
the floor. The surface gains on the inside and outside surfaces
should probably be set to zero. They are a simplified way of
modeling radiant surfaces.</p>
<p>As a side note and if you have not done so already, it might be a
good idea to consult the Type56/TRNBuild documentation, which
defines all of the fields that TRNBuild asks the user to fill in.<br>
</p>
<p>kind regards,</p>
<p> David</p>
<p> <br>
</p>
<div class="moz-cite-prefix">On 06/28/2022 22:36, H via TRNSYS-users
wrote:<br>
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<blockquote type="cite"
cite="mid:689cd273.2cf6.181ad885d27.Coremail.pdhvac@126.com">
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<div style="margin:0;"> Deal all,</div>
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<div style="margin: 0px;">When I set 1st gournd floor as
external catagory, what should I set these parameters ？</div>
<div style="margin: 0px;"><img
src="cid:part1.0g1fl37a.N2GfmP0l@tess-inc.com"
orgwidth="475" orgheight="382" data-image="1" style="width:
475px; height: 382px; border: none;" class=""></div>
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<p> </p>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
<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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