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Re: [TRNSYS-users] PV ;radiation and frecuency.



Dear Javier,

The physics of the pv modules are very complicated and they are dependent on the wavelength of the incoming radiation. Quoting Beckman and Duffie (Solar Engineering of Thermal Processes, John Wiley & Sons, 1991): "...the simplified circuit model cannot reproduce all the complicated phenomena that occur when photons interact with a semiconductor. In spite of these problems, the model is adequate for systems design and can even be extended to approximate the observed temperature dependence."

The PV models use manufacturer's information under standard operation points, from where characteristic parameters can be calculated. The performance of the pv cells under different operating conditions can be predicted from these characteristic parameters. I would suggest that you go through the mathematical description of the PV modules, in Volume 5, section 5.2.5 'Photovoltaic array'.

I hope this helps. Please let me know if you have further questions.
Best regards,

Diego


javier mota wrote:

Dear all: I am javier mota from 3i-ingenieria, madrid
We are working with Pv model.
The silicon in a Pv panel is a semiconductor, so only some frecuency radiation may be useful; is that OK? So how can I consider the usefull radiation on a Pv model depending on the orientation of the PV.
We are studying th pv for a location in  spain.
Thanks in advance.

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Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706