Linear Fresnel collector model

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andres_montero
andres_montero's picture
Linear Fresnel collector model

Do the values on the collector incidence angle table are inherent to the location where the real Fresnel collector was tested or they are only related to the geometry of the collector (with no reationship to the location)?I was wondering if the longitudinal/tranversal values would change depending on the location of the collector or they remain constant in order to modify the incidence radiation at that specific location?

And last, where is the Trnsys source file for the linear Fresnel collecto. I would like to review the source code.

Thanks,

Andrés

Paul Gilman

Dear Andrés,

The collector incidence angle table (and incidence angle modifier equations) are independent of the location of the plant, and represent the geometry of the collectors in the field. The longitudinal and transversal values would be the same for a given field geometry in any location.

During simulations, SAM calculates the solar position for each time step based on the time of year and latitude and longitude from the weather file. SAM then calculates the incidence angle in that time step based on the solar angles and collector angles. Finally, SAM determines the optical efficiency in the time step by looking up the efficiency value in the table for that time step. For angles between those in the table, SAM uses extrapolation to estimate the efficiency value.

Best regards,
Paul.

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