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Frédéric<br>
As with most things in TRNSYS, there is not just one way to do
lighting. The most important thing to keep in mind about it is that
TRNSYS does not do any kind of day or artificial light level
analysis in the building model. It is only taking into account the
heat gains that are associated with the lighting. Type15 (the
weather data reader) does give you a value of the outdoor luminous
intensity but you'll notice that this value is directly tied to its
calculation of solar radiation.<br>
<br>
If you make your building using the wizard then a default on/off
lighting controller with deadbands is added to the project. The
controller is set up so that if the lights are ON they will stay ON
until the amount of solar radiation on the horizontal exceeds
200W/m2 at which point they will turn OFF. If they are OFF, they
will stay OFF until the solar on the horizontal falls below 120W/m2.
The negative numbers are there because the controller is designed to
be a differential controller (ie watching the difference between two
values instead of comparing absolute values. With a set point of 0
(the "upper input value" in this case) the negative numbers are just
there to make the "turn on" and "turn off" input value differences
work out correctly.<br>
Kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 3/24/2014 05:29, Frédéric
Oleksandrow wrote:<br>
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<p class="MsoNormal">Dear all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I don’t understand how
the artificial lighting in the Trnsys 17 works.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">As I can see, there is a
controller with some input values, like « upper » and
« lower dead band ». But in the native examples of trnsys
17, these inputs are not configured.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Moreover, there is
nothing to say what is the level of intensity required to
switch off the artificial lighting inside the room.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">(What is the minimum
“lux” value inside the room ?)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">And finally, for the
value (-120) * 3.6 in ITLIGHTON, where is it taken into
account ? Why is it a negative value ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Could you please help me
to better understand and control these things ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:FR-BE"
lang="EN-US">ir. Frédéric Oleksandrow<br>
<br>
<b>E.W.A. Engineering</b><br>
BE 0545.866.807<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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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>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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