<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<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;"> There is another alternative as well, which
is Type1267. It is a finite difference model that we wrote to
really dig into the coupling between buildings and the
surrounding ground. It is somewhat tricky to set up and it runs
slowly, however, it can model almost any configuration you want.
You can set up basements, partial basements (ie where the ground
slopes), etc. You can also embed pipes in the soil or in the
slab. Essentially what you are doing in this case is taking the
floor model out of Type56 and using this finite difference
approach which does not rely on transfer functions and does not
have a time base. </span><span
style="font-family:verdana;font-weight:normal; font-size:12px;"><span
style="font-family:verdana;font-weight:normal;
font-size:12px;">The one thing that might be tricky for it is
to deal with a situation where you've got a radiant slab
between two floors in the building (as opposed to in a floor
that has some combination of insulation and soil on the back
side of it).</span></span></p>
<p><span style="font-family:verdana;font-weight:normal;
font-size:12px;"><span
style="font-family:verdana;font-weight:normal;
font-size:12px;">David</span></span></p>
<p><span style="font-family:verdana;font-weight:normal;
font-size:12px;"><span
style="font-family:verdana;font-weight:normal;
font-size:12px;"><br>
</span> </span></p>
<br>
<div class="moz-cite-prefix">On 09/11/2018 09:33, Noortje Alders
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:76ae74f7-582b-7bbb-5530-f45f62e4f7d2@peutz.nl">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<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>
</span> <img src="cid:part1.D0A8F685.8955BC8A@tess-inc.com"
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>
<hr> </span> </div>
<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">
<meta http-equiv="content-type" content="text/html;
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:part1.D0A8F685.8955BC8A@tess-inc.com"
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>
<hr> </span> </div>
<br>
<a href="http://www.peutz.nl/index.php?pageid=109"
moz-do-not-send="true">Klik hier</a> om u aan te melden op
de Peutz Actueel<br>
<a href="http://www.peutz.nl/index.php?pageid=105"
moz-do-not-send="true">Klik hier</a> voor het
cursusoverzicht van Peutz Academy<br>
E-MAIL DISCLAIMER: <a
href="http://www.peutz.nl/disclaimer/emaildisclaimer.html"
moz-do-not-send="true">http://www.peutz.nl/disclaimer/emaildisclaimer.html</a>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
TRNSYS-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:TRNSYS-users@lists.onebuilding.org" moz-do-not-send="true">TRNSYS-users@lists.onebuilding.org</a>
<a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org" moz-do-not-send="true">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a>
</pre>
</blockquote>
<br>
<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>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com" moz-do-not-send="true">http://www.trnsys.com</a></pre>
</blockquote>
<br>
<br>
<a href="http://www.peutz.nl/index.php?pageid=109"
moz-do-not-send="true">Klik hier</a> om u aan te melden op de
Peutz Actueel<br>
<a href="http://www.peutz.nl/index.php?pageid=105"
moz-do-not-send="true">Klik hier</a> voor het cursusoverzicht
van Peutz Academy<br>
E-MAIL DISCLAIMER: <a
href="http://www.peutz.nl/disclaimer/emaildisclaimer.html"
moz-do-not-send="true">http://www.peutz.nl/disclaimer/emaildisclaimer.html</a>
</blockquote>
<br>
<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">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>
</body>
</html>