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Masood,<br>
The steps are probably caused by a large difference between your
simulation time step and your building's timebase. A wall's response
to a change in ambient conditions is characterized by equations that
have a series of coefficients each of which can be thought of as a
relative weighting factor for a particular ambient condition
stepping backwards in time. For example, there are some coefficients
that tell how important the temperature difference across the wall
was one time base ago, two time bases ago, three time bases ago,
etc. You can set the timebase in TRNBuild (open the "outputs"
window) and it is best if the timebase matches your simulation time
step.<br>
I am not sure what simulation time step you are using but please
bear in mind that many of the models in TRNSYS are not appropriate
when used with tiny time steps. I would not recommend using a time
step less than about 1 minute.<br>
Kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 10/22/2014 10:40, Masood Mobarak
wrote:<br>
</div>
<blockquote
cite="mid:1413992456.40623.YahooMailBasic@web172102.mail.ir2.yahoo.com"
type="cite">
<pre wrap="">Hi @ all,
I am writing my master thesis about room simulation and I am new to TRNSYS.
I have two question and i hope that you can help me:
1. Question: How comes that the temperature course of a room (type 56) has alsways jumps/steps.
For Example: When the ambient temperature is very cold then the temperature in the room falls, but in many little steps (See attachment).
Is this a fault from the simulation? If not can someone explain me why this course is correct ?
2. The temperature in the room falls immediatly after the ambient temperature falls. Is this also correct? I thought there have to be some time until the temperature from the room will react to the ambient temperature or to heating the room. When the heating power beginn the temperature begins to raise. I thought that there have to be some minutes until it will beginn to raise.
Kind regards,
Masood Mobarak</pre>
<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
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