[TRNSYS-users] IAM (incidence angle modifier) using TESS Type538

Fri Jan 9 12:07:27 PST 2009

Dear Giulio,

After looking at the source code for Type538, I realized that the NX
arrary for the DYNAMICDATA utility routine was backwards..
"NX(1)=NTRNS
NX(2)=NLONG
CALL DYNAMICDATA(LUIAM,2,NX,1,X,Y,INFO,*20)"

The correct fix would be...

"NX(2)=NTRNS
NX(1)=NLONG"

In the mean time for a temporary fix, yes, you max switch the parameter 11
and 12 in the proforma. If you have an equal number of transversal and
longitudinal angles, this will not be a problem.

I apologize for any inconvenience. Thank you for bringing this to our
attention.

Best regards,

Matt Duffy
Technical Support Team
Thermal Energy System Specialists
22 N Carroll, Suite 300
Madison, WI  53703
duffy at tess-inc.com

----- Original Message -----
From: "giulio betti" <giulio.betti at gmail.com>
Sent: Tue, January 6, 2009 10:38
Subject:Re: [TRNSYS-users] IAM (incidence angle modifier) using TESS Type538

Ok, here they are.
The transversal IAM are provided for 0° (=1), 20° (=1.02), 40° (=1.03),
60°
(=0.89), 90° (=0), whiIe the longitudinal IAM are provided for 0° (=1),
50°
(=0.92), 90° (=0).
I have to add another information: I tried to use the same file .dat with
Type71, setting 3 in parameter 10 [Number of longitudinal angles for which
IAMs are provided] and 5 in parameter 11 [Number of transverse angles for
which IAMs are provided] and it works. So, for this collector it seems the
documentation is right, while with Type538 there is the problem I described
in the other email.
Maybe the simpliest explanation is that in Type538 parameter 11 should be
named "Number of longitudinal angle" and parameter 12 "Number of transverse
angle"...or maybe I'm making some mistake...
Thank you very much,
regards,
Giulio
2009/1/6 David Bradley <bradley at tess-inc.com>

> Giulio,
>  Could you please send me your project (*.tpf file) and your IAM file? I
> will try to find the cause of the error and then make sure that there is
not
> a mistake in the documentation!
> Kind regards,
>  David
>
>
> giulio betti wrote:
>
>   dear all,
> I'm using Type538 (TESS Solar Library, Evacueted tube collectors) at
> university. I have a problem with IAM: I read the posts about it on this
> mailing list and the chapter 5.11.14.4 of the Trnsys16 manual, so I think
> I've understood how to use it. I made the external data file needed by
> subroutine DYNAMICDATA as explained in the manual:
>
> <Transversal angle 1> <Transversal angle 2> etc. Nt values [0;90]
>
> <Longitudinal angle 1> <Longitudinal angle 1> etc. Nl values [0;90]
>
> <IAM 1 1> IAM for transv. angle 1, long. angle 1
>
> <IAM 1 2> IAM for transv. Angle 1, long. angle 2
>
> ...
>
> <IAM 1 Nl> IAM for transv. angle 1, long. angle Nl
>
> <IAM 2 1> IAM for transv. angle 2, long. angle 1
>
> <IAM 2 2> IAM for transv. angle 2, long. angle 2
>
> ...
>
> <IAM 2 Nl> IAM for transv. angle 2, long. angle Nl
>
> <IAM 3 1> IAM for transv. angle 3, long. angle 1
>
> ...
>
> <IAM Nt Nl> IAM for transv. angle Nt, long. angle Nl
>
> Having 5 transversal angles [0°, 20°, 50°, 70°, 90°] and 3
longitudinal
> angles [0°, 50°, 90°] my file .dat is something like this (I don't
write all
> 15 values of the column):
>
> 0 20 50 70 90
>
> 0 50 90
>
> 1
>
> 0.95
>
> 0
>
> .
>
> .
>
> .
>
> 0
>
> In Type538 I set parameter 11 (Number of transverse angles) to 5 and
> parameter 12 (Number of longitudinal angles) to 3. Now, I tried to run the
> simulation: Trnsys didn't work: it said that there was an error without
> specifing details:
>
> Fatal Error at time   :      3245.010000
>     Generated by Unit     :     3
>     Generated by Type     :   538
>     TRNSYS Message    109 : Error reading data stored in logical unit.
> NOTE: the reported logical unit number may be automatically or internally
> ASSIGNed, or you may have specified the incorrect number of independent
> variables.
>     Reported information  : Logical Unit number 33
>
>
> So I tried to change parameter 11 and parameter 12: I set parameter 11 to 3
> and parameter 12 to 5 (I simply reversed the number of transversal angles
> with the number of longitudinal angles). In this way the simulation ran!
>
> So the question is this: the file .dat has to be written as described in
> the manual, and there is only an inversion in the definitions of "parameter
> 11" and "parameter 12", so that the only change to do is the one described
> above?
>
> Or the definitions of "parameter 11" and "parameter 12" are right and there
> is to change the file .dat putting in the first line the longitudinal
angles
> and in the second line the transversal angles? In this case, the column
with
> all the possible multiplications is to be left as it is described in the
> manual, or I have to modify it in this way:
>
> <IAM 1 1> IAM for long. angle 1, transv. angle 1
>
> <IAM 1 2> IAM for long. Angle 1, transv. angle 2
>
> ...
>
> <IAM 1 Nl> IAM for long. angle 1, transv. angle Nl
>
> <IAM 2 1> IAM for long. angle 2, transv. angle 1
>
> <IAM 2 2> IAM for long. angle 2, transv. angle 2
>
> ...
>
> <IAM 2 Nl> IAM for long. angle 2, transv. angle Nl
>
> <IAM 3 1> IAM for long. angle 3, transv. angle 1
>
> ...
>
> <IAM Nt Nl> IAM for long. angle Nt, transv. angle Nl
>
> ?
>
> I hope I've been clear enough, thank you all,
>
> regards,
>
> Giulio Betti
>
> ------------------------------
>
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>
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> Thermal Energy System Specialists (TESS), LLC
> David BRADLEY                      22 N. Carroll Street - Suite 370
> Partner                            Madison, WI 53703
>                                    USA
> P: +1.608.274.2577
> F: +1.608.278.1475
> E-mail: bradley at tess-inc.com
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>
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