[TRNSYS-users] Re : TRNSYS-users Digest, Vol 52, Issue 25

First, you have to well understand the file.dat which you have attached.

After you determine the different angle factors, you create a new file .dat like the one which you have attached. Then you put the values determined with the model of your evacuated tube ( in your case you should use the spf model which is the Seido1-16: for that you use the "angle factors" curves in page 2) and then you calculate the different values for each transversal and longitudinal incident angle

E.g. the value for a transversal incidence angle = 15° and a longitudinal incidence angle=30° is simply 1.01*0.98=0.99
*
* The data file for Type71 must include the following data:
*
* --- The file first includes the 7 values of transversal angle:
* 0 15 30 45 60 75 90
* --- Then the 7 values of longitudinal angle:
* 0 15 30 45 60 75 90
* --- Then a matrix of IAM values for different angles. The value in line i, column j corresponds to transversal angle i, longitudinal angle j.
* --- The matrix is written in one long column, line after line
* --- 1 st value: IAM for Transversal angle = 0° and Longitudinal angle = 0 (1.00*1.00=1.00)
* 1.00
* --- 2 nd value: IAM for Transversal angle = 0° and Longitudinal angle = 15 (1.00*1.00=1.00)
* 1.00
* --- 3 rd value: IAM for Transversal angle = 0° and Longitudinal angle = 30 (1.00*0.98=0.98)
* 0.98
* --- Etc.
* --- 8th value: IAM for Transversal angle = 15° and Longitudinal angle = 0 (1.01*1.00=1.01)
* 1.01
* --- 9th value: IAM for Transversal angle = 15° and Longitudinal angle = 15 (1.01*1.00=1.01)
* 1.01
* --- 10th value: IAM for Transversal angle = 15° and Longitudinal angle = 30 (1.01*0.98=0.99)
* 0.99
* --- Etc.

Then you put them one after one in the new file.dat wich you have created. You should put them like the file in the TRNSYS model(the .dat file you have attached). Furthermore, you save your file in the trnsys file (like the exemple in trnsys) , you can name il as the name of the evacuated tube model (Seido).

Finally, in the trnsys worksheet, you attach the corresponding Seido file .dat in the type 71.

It's not complicated and these instructions are applicable for any type of an evacuated tube collector.

De : "trnsys-users-request@cae.wisc.edu" <trnsys-users-request@cae.wisc.edu>
À : trnsys-users@cae.wisc.edu
Envoyé le : Jeudi, 23 Avril 2009, 23h10mn 50s
Objet : TRNSYS-users Digest, Vol 52, Issue 25

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Today's Topics:

1. Out of the office (paul@solem.com.au)
2. Re: Type71 IAM .dat file and how to use it? (Mario Leroy Ortiz)

-----Le message joint suit.-----

I am currently out of the office, returning April 27th 2009. In urgent cases please contact Dr Mike Dennis, mike@solem.com.au.
Thank you, best regards

Dr Paul Kohlenbach
Solem Consulting

-----Le message joint suit.-----

Lucas Witmer,

Attached is a .dat file for vacuum tube collectors. I have also attached a performance sheet from the manufacturer and a spreed sheet that I used to calculate the .dat values.

Thank you,

Mario Ortiz

On Thu, 23 Apr 2009 12:55:21 -0400
Lucas Witmer <ltw110@psu.edu> wrote:
> Hi,
> I am unable to get a simple evacuated tube simulation to work. I am in need
> of help. TRNSYS seems to be in need of an incident angle modifier data
> file, and I cannot find one anywhere to work with or base my own file format
> off of.
>
> I have a basic understanding of what numbers I need (Theta, KTauAlpha) and
> how to find them, but I am unsure of the format of the .dat file. I do not
> need to model any specific evacuated tube collector, so if anyone has a
> functioning model, with the IAM data file, for any evacuated tube collector,
> and doesn't mind passing them along to me for reference to help me build my
> own IAM file, I would greatly appreciate it.
>
> Thanks,
> Luke
>
> --
> M.S. Candidate, Energy and Mineral Engineering
> --
> ltw110@psu.edu
> Penn State Solar Decathlon 2009 Team
> 212 Hosler Building
> University Park, PA 16802
> www.solar.psu.edu

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