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Re: [TRNSYS-users] Temperature course and reaction time
David and Stuart,
thank you for the replies.
That was the solution to my problem.
But now there is a new question related to this topic:
How can I simulate a building for short times ?
I want to know the behaviour of a building so that I can program a controller for the building.
Is there a chance to simulate a building with a timebase from 1 minute ?
If I do so, then there will be problem with the CFT coefficients.
Or can I still simulate with the step stairs and get a good results ?
Have someone experiences for short time simulations ?
Kind regards,
Masood Mobarak
--------------------------------------------
Dols, William Stuart <william.dols@nist.gov> schrieb am Mi, 22.10.2014:
Betreff: Re: [TRNSYS-users] Temperature course and reaction time
An: "TRNSYS users mailing list at OneBuilding. org" <trnsys-users@lists.onebuilding.org>
Datum: Mittwoch, 22. Oktober, 2014 23:29 Uhr
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Masood,
Here are a couple of papers related to this topic.
Delcroix, B., M. Kummert, A. Daoud, and M. Hiller. 2012.
Conduction transfer functions in TRNSYS multizone building
model: Current implementation, limitations and possible
improvements. in Fifth National Conference of IBPSA-USA
(SimBuild 2012). Madison, WI.
Delcroix, B., M. Kummert, A. Daoud, and M. Hiller. 2013.
Improved Conduction Transfer Function Coefficients
Generation in TRNSYS Multizone Building Model, in 13th
Conference of International Building Performance Simulation
Association (BS2013): Chambery, France.
- Stuart
From: TRNSYS-users
[mailto:trnsys-users-bounces@lists.onebuilding.org]
On Behalf Of David BRADLEY
Sent: Wednesday, October 22, 2014 4:29 PM
To: TRNSYS users mailing list at OneBuilding.org;
masood.mobarak@yahoo.com
Subject: Re: [TRNSYS-users] Temperature course and
reaction time
Masood,
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.
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.
Kind regards,
David
On 10/22/2014 10:40,
Masood Mobarak wrote:
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
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--
***************************
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
d.bradley@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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