Dear Diego,
Thanks for your help, I appreciate.
I’m afraid there is a mistake in your proposal : I don’t think
QSOLGAIN is equal to QTABSI + QTABSO. I’ve done some simulations and
compared values of energy_zone.bal with direct outputs : at any time I
find that QSOLGAIN = QTSABS (NTYPE 75) and not at all QTABSI + QTABSO.
It seems logical for me : QTABSI and QTABSO are total radiation
absorbed at all inside/outside surf. of zone (*includes solar gains,
radiative heat, internal radiative gains and wallgains*) (see volume
6, part 2, page 96). It doesn’t correspond to solar gains…don't you
agree ?
I will adopt your proposal to obtain the energy balance of my building
but it is not perfectly satisfying. In my job, more and more projects
use dynamic simulation of building. It is very interesting because,
thanks to dynamic simulation, we learn a lot of things about thermal
behaviour of buildings. But we have to be sure of our simulation
results. In thermal simulations, it is always satisfying to verify
that energy balance is OK. It is a good indicator of coherence of
results. That’s why I think it may be very useful to have access to
QTRANS in direct outputs. Don’t you think it can be included in the
next version of TRNSYS 16 ?
An other suggestion : it may be very useful for TRNSYS Users to have
access to scientific papers about studies using TRNSYS (I know there
exist a lot of papers about scientific studies using dynamic
simulation, especially in solar energy…). Reading these papers can be
very reassuring concerning validations of models, useful concerning
limits of models, etc.
I think many TRNSYS Users don’t have the time to search these kind of
papers in the web. Don’t you think it can be possible to have access
to these papers or links to site where they can be found, in your SEL
Website ?
Best regards,
/Christophe.
/At 17:04 09/11/2005, Diego A. Arias wrote:
Dear Christophe:
The energy balance on a zone is given by:
BAL_ENERGY = -DQAIRdt + QHEAT - QCOOL + QINF + QVENT + QCOUP + QTRANS
+ QGINT + QWGAIN + QSOLGAIN
BAL_ENERGY should be always 0.
You can get many of these values using the optional outputs (NTYPES):
DQAIRdt --> DQAIR (NTYPE8)
QHEAT --> QHEAT (NTYPE30)
QCOOL--> QCOOL (NTYPE31)
QINF --> QINF (NTYPE4)
QVENT --> QVENT (NTYPE5)
QCOUP --> QCOUP(NTYPE6)
QGINT --> QGCONV(NTYPE7) + QGRAD(NTYPE13)
QWGAIN --> QTWG (NTYPE76)
QSOLGAIN --> QTABSI (NTYPE14) + QTABSO(NTYPE15)
The only variable that is not given as an optional output is QTRANS.
But, as you have all of the other variables, it can be calculated
from the energy balance.
Please let me know if this helps.
Best regards,
Diego
Enertech wrote:
Dear Diego,
Thanks for your solution. Even if it isn't the most cleanest
solution, I don't really care. But I think the most simplest
solution would be to obtain the same energy balance that in the file
energy_zone.bal, with direct outputs (see the second part of my
email). I found the equivalent output of QSOLGAIN : this is QTSABS
(NTYPE75, see volume 6, part 2, page 98), but I don't know how to
obtain the equivalent output (or combination of outputs) of QTRANS.
Do you have an idea ?
Kind Regards,
Christophe
At 17:07 08/11/2005, Diego A. Arias wrote:
Dear Christophe:
Unfortunately, the renaming of the output files only occurs in
files that have the same file name as the input file.
An alternative could be to take advantage of the possibility that
TRNSYS can be run from the command line. If you type 'TRNExe.exe
Input.dck', TRNSYS will start and execute the input file Input.dck
This alternative allows you to run batch files. For example, you
can have in your batch file:
"C:\Program Files\Trnsys16\Exe\TRNExe.exe" "C:\Program
Files\Trnsys16\MyProjects\input1.dck" /N
"C:\Program Files\Trnsys16\Exe\TRNExe.exe" "C:\Program
Files\Trnsys16\MyProjects\input2.dck" /N
In this case, TRNSYS will start and run input1.dck, close, open
again and run input2.dck. The command /N tells TRNSYS not to
display the dialog box at the end of the simulation.
This may not be the cleanest solution, since you will have to
create the input files by hand, but I do not know of another way to
work out this problem.
Please let me know if you need additional information of how to
implement this.
Best regards,
Diego
Enertech wrote:
Dear TRNSYS Users,
In a building simulation study, I want to do a batch simulation by
changing automatically several parameters. So, I would like to use
TRNEDIT and a parametric table. My problem is that the file I want
to use,"Energy_zone.bal", is overwritten at each simulation and
that I don't know how to increment this file name.
I know that the output file must have the same name that the *.trd
file to be incremented but I don't know how to change the name of
energy_zone.bal.
As a solution, I'm trying to recalculate the data contained in the
file "energy_zone.bal" with direct outputs of the *.bui file, but
I don't know how to calculate QTRANS and QSOLGAIN (see volume 6
part 2, page 103), these variables are not direct outputs.
So, what do you think I should do ?
Thanks a lot for your help.
Christophe
===========================
ENERTECH
F-26160 FELINES SUR RIMANDOULE
tel-fax : 04 75 90 18 54
Email : sidler@club-internet.fr
Web : http://sidler.club.fr <http://sidler.club.fr/>
================================
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@engr.wisc.edu
https://www.cae.wisc.edu/mailman/listinfo/trnsys-users
--
Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@engr.wisc.edu
https://www.cae.wisc.edu/mailman/listinfo/trnsys-users
===========================
ENERTECH
F-26160 FELINES SUR RIMANDOULE
tel-fax : 04 75 90 18 54
Email : sidler@club-internet.fr
Web : http://sidler.club.fr <http://sidler.club.fr/>
================================
===========================
ENERTECH
F-26160 FELINES SUR RIMANDOULE
tel-fax : 04 75 90 18 54
Email : sidler@club-internet.fr
Web : http://sidler.club.fr
<http://sidler.club.fr/>================================