[TRNSYS-users] TYPE 71

[Martin]

Dear Meriem
I think you calculated the right matrix coefficients. (It would be 
helpful if you could provide us the values, you got from the graph). I 
also have the problem in specifying the fourth parameter (Negative of 
second order efficiency coeficient). I solved that problem by changing 
the default value and save the model again. The efficiency mode of the 
SPF measurement is 2. The temperature range of evacuated tubes depend 
very much on the specific type (max. pressure etc.)
I have another problem with TYPE71. Maybe somebody could tell me what is 
the difference between type71 and type1e (Biaxial Incidence Angle 
Modifiers). In the manual it is mentioned that both types use the same 
"thermal model" but the results of my calculation are quite different.
Thanks
Martin



MERIEM SOUSSI wrote:

> Dear Trnsys-users,
> I am using type 71 in order to model an evacuated tube collector, I 
> created an IAM data file from the technical support I joined to my 
> mail, I wish that somebody could tell me if I calculated properly the 
> matrix coefficients, I did it exactly as descibed in the comment of 
> the file "Type71-EvacuatedTubeSolarCollector-IAMData.dat".
> I am also having a problem in specifying the fourth parameter: the 
> efficiency mode, since I did not find in the technical support any 
> remark about the Tc value (whether it is the inlet, the average or the 
> outlet Temperature).
> My last question is about the range of fluid temperature that 
> evacuated tubes are able to provide.
> I will be grateful for all your advises and suggestions.
> Best Regards.
> Meriem
>
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