# Generic Solar System. Solar field thermal output

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Pierre
Generic Solar System. Solar field thermal output

Dear Paul,

Could you confirm to me that this draw is correct?

I have been working with "Linear Fresnel", too.

Could you confirm to me the next sentences:

1) "Solar field thermal output" (from "Generic Solar System") = "Total power incident on the field" (from "Linear Fresnel").

2) "Total receiver thermal losses" (from "Linear Fresnel"). These losses are considered with other parameters in "Solar field thermal losses" (from "Generic Solar System").

Paul Gilman

Dear Pierre,

1. You are correct: For the Generic Solar System model, the Solar Field Thermal Output variable should be labelled as "Solar Field Incident Thermal Power." We will correct this in the next version of SAM.

2. For the Generic Solar System model, SAM calculates and reports the total solar field thermal losses based on the "Generalized Thermal Losses" parameters you specify on the Solar Field page. It does not calculate separate receiver losses as the linear Fresnel and trough models do.

Best regards,
Paul.

Pierre

Dear Paul,

I have a new question about the losses.

I have seen that in SAM, it has been considered the "Solar field thermal losses" before the "Solar field optical efficiency".

Firstly, SAM would not have to to consider this efficiency applied to the energy incident. And after that, SAM would have in consideration the "solar field thermal losses"?

Paul Gilman

Dear Pierre,

Can you be more precise about where you have seen that SAM calculates the solar field thermal losses before the optical efficiency? As you know, there are seven different CSP performance models available in SAM, and I am not sure whether your question applies to a single CSP model or to all of them.

Best regards,
Paul.

Pierre

Dear Paul,

I am sorry Paul. I am working with Generic Solar System in 2013.1.15 version.
I have seen that this equation has been applied every hour:

[("Solar field thermal output")-("Solar field thermal losses")]*("Solar field optical efficiency")= ("Solar field delivered thermal power")

For this reason, I have said that I think that "solar field thermal losses" have been considered before the "solar field optical efficiency". Is it correct? Why?

Paul Gilman

Dear Pierre,

Thank you for the clarification.

There is an error in the labeling of results for the Generic Solar System model. "Solar Field Thermal Output" should be "Solar Field Incident Thermal Power."

The label will be correct in the next update to SAM 2013.1.15.

Best regards,
Paul.

Pierre

Dear Paul,

Thank you for the clarification.

[("Solar field thermal output")-("Solar field thermal losses")]*("Solar field optical efficiency")= ("Solar field delivered thermal power")

I do not understand why the "solar field thermal losses" have been applied before to the "solar field optical efficiency".

Maybe, this equation would have to be as I write it now:
("Solar field thermal output")*("Solar field optical efficiency")= ("Solar field delivered thermal power")-("Solar field thermal losses")

Paul Gilman

Dear Pierre,

In SAM 2013.1.15, the value reported by the generic solar system model for solar field thermal losses value is incorrect because it does not include optical losses. We will fix this in the next version of SAM.

The solar field delivered thermal power is correct, and the internal calculations are correct.

Thank you for pointing out the error.

Best regards,
Paul.

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