Dipl.-Ing.
Marion Hiller
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Von: Marion Hiller
Gesendet: Donnerstag, 14. April
2011 11:57
An: pseudomino@gmx.com
Betreff: AW: [TRNSYS-users] Type
99 and units
Dear David,
Type 99 is a little
confusing with regards to units.
In the data file
radiation data is assumed to be in W/m² if you use the following definition of
“mult” and “add”
"<var>
IBEAM_H <col> 5
<interp> 0 <add> 0 <mult>
1 <samp> -1 !...to get
radiation in W/m²"
Nevertheless, the outputs are converted within the
Type into “kJ/ hr m²” . Therefore, you don’t need an
equation!
Regards,
Marion
Von:
pseudomino@gmx.com [mailto:pseudomino@gmx.com]
Gesendet: Donnerstag, 14. April
2011 11:32
An: TRNSYS-users@cae.wisc.edu
Betreff: [TRNSYS-users] Type 99
and units
Thank you,
So I won't use these pull-down menus and use Equations instead to covert them.
But I need a simple confirmation about my question : when I use a Type 99, the
radiations :
- are given in W/m2
-mulitiplied by 3.6 to be outputed in kJ/hr.m2
Am I right ?
----- Message d'origine -----
De : David BRADLEY
Envoyés : 13.04.11 20:12
À : pseudomino@gmx.com
Objet : Re: [TRNSYS-users] Type 99
/ 109 and units
Be very careful!!! You cannot change units
using the pulldown menu in any
component's inputs tab!!! A component's output values are
passed directly to the appropriate component input values without any
modification regardless of what units you have selected in the inputs or
outputs tab. Those pulldown menus are only at the interface level; when the
Studio writes the deck file, it writes everything in the base units of the
proforma. Note that it is safe to change the units of parameters (and
unconnected inputs) again because they will be converted to base units when the
Studio writes the deck.
We do not recommend using Type109. Type109's functionality was moved to Type99
(for the "user-defined" data file mode) and to Type15 (for the
standard TRY file format). If you find references to Type109 in the
documentation, please let us know so that we can refer to the proper component
instead!
Regards,
David
On 4/13/2011 03:29, pseudomino@gmx.com
wrote:
Hello there,
I have a doubt with my units. I use a Type 99 and I can see in the Outputs tab
"kJ/hr.m^2"
for the radiations.
But in the exemple file (of user defined file), there is this line :
"<var>
IBEAM_H <col> 5
<interp> 0 <add> 0 <mult>
1 <samp> -1 !...to get
radiation in W/m²"
So I wonder if I can ignore this unit in type 99 (kJ/hr.m^2) and just change it
to W/m^2 in type 56's Inputs tab.
By the way, I don't realy understand what is type 109 ? It is often mentionned
in the user guide, but it seems that it is a generic component ?
Thanks in advance
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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