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<p><font face="Verdana">Dear David,</font></p>
<p><font face="Verdana">Thank you for your answer. This is actually
what I expected but hoped not to be the case. I think the energy
consumption of the building can be calculated reliably; however,
I would like to study the behaviour of the floor heating in more
detail. I guess I have to decide from situation to situation
which time-base to use, as the higher the time-constant (the
slower the system), the less the time-base matters. <br>
</font></p>
<div class="moz-signature"><span
style="font-family:verdana;font-weight:normal; font-size:12px;">
Met vriendelijke groet,<br>
Noortje Alders<br>
<br>
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<div class="moz-cite-prefix">Op 11-09-2018 om 16:02 schreef David
BRADLEY:<br>
</div>
<blockquote type="cite"
cite="mid:4d6cc40d-03e6-6929-9903-4f4082ae7ee6@tess-inc.com">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<p><span style="font-family:verdana;font-weight:normal;
font-size:12px;">Noortje,</span></p>
<p><span style="font-family:verdana;font-weight:normal;
font-size:12px;"> The time base has to do with how often the
wall transfer functions are updated. The time base is distinct
from the simulation time step and while it is ideal to have
the time base and the time step be equal, it is rarely
possible. Ventilation and occupancy changes occur as a
function of the simulation time step. You'll see some stepwise
behavior in the room air temperature if your time step and
time base are different but in my experience this does not
lead to significant problems in computing either the comfort
or the energy consumption of the building. I often have
situations in which I use a 1-5 minute time step and have to
use a 1 hour wall time base in the building.</span></p>
<p><span style="font-family:verdana;font-weight:normal;
font-size:12px;">kind regards,</span></p>
<p><span style="font-family:verdana;font-weight:normal;
font-size:12px;"> David</span></p>
<p><span style="font-family:verdana;font-weight:normal;
font-size:12px;"><br>
</span></p>
<br>
<div class="moz-cite-prefix">On 09/11/2018 03:12, Noortje Alders
via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:2befcd3a-0368-9007-8c83-2e13e978a912@peutz.nl">
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charset=utf-8">
<p><font face="Verdana">Dear TRNSYS users,</font></p>
<p><font face="Verdana">I want to analyze the thermal behaviour
of a dwelling with floor heating in detail. Attatched is a
drawing of the floor construction. The time-base is set by 1
hour by default. I would like to set this time-base to a
lower value (eg 15 minutes or less) to be able to analyse
the reaction to change in occupancy with accordingly
changing ventilation, heating setpoint and internal gain.
However, the high thermla mass and high insulation value
doesn't allow me to because the stability criteria are not
fullfilled. ("Error creating the wall transfer coefficients:
Stability criteria not fullfilled"). In a previous thread of
the forum ( </font><br>
<font face="Verdana"><font face="Verdana"><a
class="moz-txt-link-freetext"
href="http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/2012-November/024387.html"
moz-do-not-send="true">http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/2012-November/024387.html</a>
) I read that there is a "trick" for this. You can devide
one layer in the ground floor (e.g. the concrete slab)
with an active layer. However, if I try I get the message
that only one active layer is allowed. Is there another
way to tackle this problem?</font></font></p>
<p><font face="Verdana">Kind regards,</font><br>
</p>
<div class="moz-signature"><span
style="font-family:verdana;font-weight:normal;
font-size:12px;"> Met vriendelijke groet,<br>
Noortje Alders<br>
<br>
</span> <img src="cid:part3.66B088A3.2884601C@peutz.nl"
class=""><br>
<span style="font-family:verdana;font-weight:normal;
font-size:12px;"> Postbus 696<br>
2700 AR Zoetermeer<br>
T: 079 3470309<br>
E: <a class="moz-txt-link-abbreviated"
href="mailto:n.alders@peutz.nl" moz-do-not-send="true">n.alders@peutz.nl</a><br>
W: <a class="moz-txt-link-abbreviated"
href="http://www.peutz.nl" moz-do-not-send="true">www.peutz.nl</a>
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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
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com" moz-do-not-send="true">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com" moz-do-not-send="true">http://www.tess-inc.com</a>
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