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Anas,<br>
The inverter model (Type48) is waiting for the electrical element
at the bottom of the tank to tell it that it needs power (i.e. that
there should be a load on it). However, the electrical element model
(Type1226) is just a simple on/off device; it turns on when its
control signal tells it to. The element is waiting for the inverter
model and the inverter model is waiting for the element.<br>
<br>
There are a many ways that you could fix the issue but which one
you choose really depends on how you want to operate the system.
Here are a couple of options:<br>
<br>
1. You can put another aquastat watching the bottom of your tank and
controlling the lower element's on/off signal. The controller (and
an equation) can then set a value that is either 0 (if the tank is
already hot enough) or is the maximum power that the element can
deliver. This value will be passed to the inverter as the load. The
inverter will then send all of the power that the PV has available
to the element (up to the inverter's capacity). Connect the
inverter's power output to the element's capacity input.<br>
<br>
2. Often times elements like yours aren't controlled; they just dump
whatever energy they can from the PV into the tank. In this case you
can get rid of the inverter and pass the PV output power directly to
the element's capacity input. In this case leave the element's
control signal set to zero.<br>
<br>
kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 06/10/2015 02:05, Anas Majdouli
wrote:<br>
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<hr id="stopSpelling">From: <a class="moz-txt-link-abbreviated" href="mailto:majdouli_anas@hotmail.fr">majdouli_anas@hotmail.fr</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a><br>
Date: Mon, 8 Jun 2015 11:35:19 +0200<br>
Subject: [TRNSYS-users] PV inverter (Type 48a) to link with
hot water tank (Type 534)<br>
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<div dir="ltr">Hi TRNsys community,<br>
<br>
For my project, I need to simulate a case : DHW production
using PV panel electricity output as an input for the
auxiliary heating within the tank. I added also an electric
aux. heater on the top of the tank to reach the set point
temperature (45°C). The TRNsys file is attached to this
email. <br>
<br>
I am requesting for your help, because the simulation
doesn't seem working. I think the problem comes from the
inverter. Maybe I haven't linked it correctly to the tank or
to the PV panel. Could you help me please ?<br>
<br>
Thanks in advance.<br>
<br>
Yours Sincerely,<br>
Anas MAJDOULI </div>
<br>
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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>
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