RE: more than 500 parameters

[Michaël Kummert <kummert@xxxxxxxxxxxxx>]

Juan,

You are right, you have to use a fixed time step in data files. You would
have to find the smaller time interval needed to describe your profile (it
appears to be 0.1 hour in your example). 
Another solution is to read a daily value (stop time for current day) and
use equations to set the auxiliary heater ON/OFF by comparing mod(time,24)
to that variable. It seems much more practical to me.

Please also note that you have to be careful with Type14. If you run a
simulation with a time step larger than 0.1 h, your example will not work
anyway (when defining a forcing function, you cannot use a time interval
shorter than the simulation time step. The next TRNSYS release will give an
error in that case).

Regards,

Michaël Kummert

_________________________________________________________

Michaël Kummert

Solar Energy Laboratory - University of Wisconsin-Madison
1303 Engr Res Bldg, 1500 Engineering Drive
Madison, WI 53706

Tel: +1 (608) 263-1589
Fax: +1 (608) 262-8464
E-mail: kummert@engr.wisc.edu

SEL Web Site: http://sel.me.wisc.edu 
TRNSYS Web Site: http://sel.me.wisc.edu/trnsys







> -----Original Message-----
> From: owner-trnsys@relay.doit.wisc.edu 
> [mailto:owner-trnsys@relay.doit.wisc.edu] On Behalf Of Jsalazar
> Sent: Tuesday, June 03, 2003 18:45
> To: trnsys@relay.doit.wisc.edu
> Subject: more than 500 parameters
>
>
> Dear Michael,
> I know this number of parameters seems quite absurd. But 
> believe me, they are necessary. I am simulating a 
> thermosyphon system and I want to know approximately how much 
> heating is needed during the night (auxiliary power) to 
> guarantee enough hot water on the NEXT day, given the 
> incident solar radiation and environment temperature. The 
> auxiliary power is turned on every night a 3 a.m. and stays 
> on for a certain period of time. Then it is turned off until 
> the next day. In order to calculate this period I simulate 
> the same deck with the control signal set to "0" and 
> integrate the amount of energy that is needed to reach the 
> desired temperature, if necessary. This integral is reset 
> every 24h. I use this information and an excel macro to 
> generate the "control profile" automatically. The profile 
> would look like this
>
> 0 0
> 3 0
> 3 1
> 3.2 1
> 3.2 0
> 24 0
> 24 0
> 27 0
> 27 1
> 27.5 1
> 27.5 0
> 48 0
> . .
> . .
> . .
> 8760 0
> There are 6 points (12 parameters) for each day! That's why I 
> need 4380 parameters. You suggested reading in the file. The 
> problem is that my intervals are not regular. I suppose the 
> DATA Reader would not do the job... Thanks, Juan
>
>
>
> ------- Original Message --------
> De: "Michaël Kummert"
> Para: "trnsys@relay.doit.wisc.edu"
> Copia:
> Assunto: RE:
> Data: 03/06/03 05:06
>
>
> Dear Juan,
>
> Yo would need to make more changes than just NMPAR. NMPAR is 
> the total number of parameters (for all units). The error you 
> get is because one unit tries using more than 500 parameters, 
> which is different limit.
>
> I would recommend that you generate the profile using 
> notepad/excel/your preferred software and save it to a file. 
> It is then easy to read the file in TRNSYS (4380 parameters 
> seems a little too much to me!).
>
> Regards,
>
> Michaël Kummert
>
> _________________________________________________________
>
> Michaël Kummert
>
> Solar Energy Laboratory - University of Wisconsin-Madison
> 1303 Engr Res Bldg, 1500 Engineering Drive
> Madison, WI 53706
>
> Tel: +1 (608) 263-1589
> Fax: +1 (608) 262-8464
> E-mail: kummert@engr.wisc.edu
>
> SEL Web Site: http://sel.me.wisc.edu
> TRNSYS Web Site: http://sel.me.wisc.edu/trnsys
>
> > -----Original Message-----
> > From: owner-trnsys@relay.doit.wisc.edu 
> > [mailto:owner-trnsys@relay.doit.wisc.edu] On Behalf Of Jsalazar
> > Sent: Tuesday, June 03, 2003 16:44
> > To: trnsys@relay.doit.wisc.edu
> > Subject:
> >
> >
> > Dear TRNSYS Users,
> >
> > I have generated a profile that has 2190 points. I got the 
> following 
> > error when I tried to run the deck
> >
> > ***** ERROR ***** TRNSYS ERROR # 50
> >
> > THE NUMBER OF PARAMETERS SPECIFIED IS NOT BETWEEN 0 AND 500
> >
> > How could I increase the maximum number of parameters of Type 14 to 
> > 4380? In this case I would also have to reset NMPAR in the 
> param.inc 
> > file, right?
> >
> > Thanks,
> > Juan Pablo de L. C. Salazar
> >
> >
> > ________________________________________________
> > E-mail enviado pelo Labsolar
> >
>
> ________________________________________________
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