RE: TYPE 55

["Timo Sengewald" <timo.sengewald@xxxxxxxxxxxxxxxxxx>]

Dear Michaël,

your type 55 is newer than mine and works fine.

Thank you!


Timo

-----Ursprüngliche Nachricht-----
Von: owner-trnsys@relay.doit.wisc.edu
[mailto:owner-trnsys@relay.doit.wisc.edu]Im Auftrag von Michaël
Kummert
Gesendet: Montag, 10. Februar 2003 19:13
An: trnsys@relay.doit.wisc.edu
Betreff: RE: TYPE 55


Dear Timo,

I do not think your problems are related to the use of several Type55
units.
I attached a simple example where 5 Periodic Integrators are used and
work
properly. Please read the comment box in the IISiBat project. I also
attached a new version of Type55 but I do not think that your problem
is
related to the fix included in that version (please let me know if I
am
wrong!).

Your problem may be related to the integrator's initialization. The
first
integrated value is always slightly off, but this small error does not
have
any effect on the other values and is usually very small (it is hardly
noticeable for a monthly integration, for example). You will notice
that
small problem in the attached example. Please also note that if you
use a
time step smaller than 1 hour and a hourly data file (e.g. weather
data),
you should NOT set the start time to a value which is not a multiple
of 1
hour to reduce the error on the first integrated value. Choosing a
start
time of 0.25, for example, would cause a "time lag" between your data
file
and the simulation.

I hope this helps,

Michaël

_________________________________________________________

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 Timo
Sengewald
> Sent: Monday, February 10, 2003 09:33
> To: TRNSYS Group
> Subject: TYPE 55
>
>
> Hello!
>
> It seems to be even worse than I told You. The first unit of
> Type 55 integrates correctly, the second does not and the
> third outputs as one would expect. As a test I let the
> integrators integrate a constant value 1. For a simulation
> time of 24 h (and any step) the integral would be 24. But
> this is not the result of all type 55 units.
>
> Does anybody else experienced something like that?
>
> Best regards,
>
> Timo
>
>
>
> Timo Sengewald
> ------------------------------------------
> Phönix Sonnenwärme AG
> Am Treptower Park 28-30
> D-12435 Berlin, Germany
> e-mail: timo.sengewald@sonnenwaerme-ag.de
> www.sonnenwaerme.ag
> Tel.: +49-(0)30-53 00 07-237
> Fax.: +49-(0)30-53 00 07-17
> ------------------------------------------
>