<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Another option is to impose the building loads on one of the lumped capacitance building models in the TESS Libraries and then connect a thermostat model to the lump. This thermostat would then turn on and off the heat pump which would feed its energy terms to the lump model as well. In all these options you need to make sure that heat pump has the capacity to meet the loads or the lump/tank temperature could run away. In a real system if the loads aren’t met the temperature rises or falls and the load reduces naturally. By imposing loads from a data file, where it is assumed the loads were always met, you lose that natural interaction and temperatures can continue to spiral away from the setpoint if you’re not careful.<div><br></div><div>Jeff/TESS<br><br><div dir="ltr"><br><blockquote type="cite">On Nov 15, 2020, at 11:38 AM, David BRADLEY via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>The connection between the file containing loads and Type682 is
usually done through Type9.</p>
<p>Your other question is a good bit harder to answer because
everything depends on the details of the system that you are
trying to model. The fundamental problem is probably that you have
hourly loads (energy rate control) while the heat pump model is a
temperature level control device that is expecting a thermostat or
some other kind of controller to give it an on/off signal. In the
real building, the heat pump would turn on and off as needed over
the course of the hour to maintain room temperatures. However, the
data file contains the total hourly load so you have to recreate,
somehow, the part load performance of the heat pump. Here is where
things depend on your system:</p>
<p>One solution is to define a thermal storage tank that circulates
liquid through Type682. You can then define an aquastat that
senses the tank temperature and turns on and off a heat pump in
order to maintain the tank at its desired set point.</p>
<p>Another solution would be to define a piping loop that has a
number of Types 682 along its length as well as some heat pumps to
maintain temperature within a defined range.</p>
<p>Yet another solution is to use the heat pump as a virtual
component, giving it the ambient and return conditions and getting
back it's COP so that you can estimate its power consumption
without modeling its on/off behavior.<br>
</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 11/13/2020 02:53, celia do carmo
ferrao Ferrao via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAHRd4u9sKCYhyV9P2a5m3X1TBt=r7Qd+=DEfmfOTVxH5SV3BHQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div dir="ltr">
<p class="MsoNormal" style="margin-bottom:0cm;line-height:27pt;background:rgb(248,249,250)"><span style="font-size:12pt;color:rgb(32,33,36)" lang="EN">Good
Morning Users<span></span></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;line-height:27pt;background:rgb(248,249,250)"><span style="font-size:12pt;color:rgb(32,33,36)" lang="EN">I'm
starting models
on Trnsys and I'm a little lost.<span></span></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;line-height:27pt;background:rgb(248,249,250)"><span style="font-size:12pt;color:rgb(32,33,36)" lang="EN">I
have data files
with, for example, heating and cooling needs, electrical,
thermal loads ....<span></span></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;line-height:27pt;background:rgb(248,249,250)"><span style="font-size:12pt;color:rgb(32,33,36)" lang="EN">The
is a file. txt.. I
can use Type 682 for Loads, but I don't know what the
correct connections are
to make:<span></span></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;line-height:27pt;background:rgb(248,249,250)"><span style="font-size:12pt;color:rgb(32,33,36)" lang="EN">1 -
Connection between
the .txt file and for example Loads, Type 682 ...<span></span></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;line-height:27pt;background:rgb(248,249,250)"><span style="font-size:12pt;color:rgb(32,33,36)" lang="EN">2 -
Connection
between Type 682, or another and a heat pump.<span></span></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;line-height:27pt;background:rgb(248,249,250)"><span style="font-size:12pt;color:rgb(32,33,36)" lang="EN">Thank
you!!!<span></span></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;line-height:27pt;background:rgb(248,249,250)"><span style="font-size:12pt;color:rgb(32,33,36)" lang="EN"><span> </span></span></p>
<span style="font-size:12pt;line-height:107%;color:rgb(32,33,36)" lang="EN">Kind Regards</span></div>
<div dir="ltr"><font color="#202124"><span style="font-size:16px">C. Ferrão<br clear="all">
</span></font>
<div><br>
</div>
-- <br>
<div dir="ltr" class="gmail_signature">Ferrão</div>
</div>
</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
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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