negative energy

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sofiane
negative energy

Hi,
I performed a simulation for a parabolic trough power plant. I get a negatives values for annual energy,capacity factor, NPV,and
Internal rate of return (IRR) NaN
Year IRR is achieved NaN
IRR at end of project NaN.

Paul Gilman

That suggests there is something wrong with your inputs, or with the data in the weather file.

Could you email me a copy of your .sam file and weather file using the contact form?

https://sam.nrel.gov/contact

Best regards,
Paul.

sofiane

I didn't find upload option in contact, help me to send you a copy of my file
Best regards

Paul Gilman

Please use the email address in the contact form to send me the attachment from your email software. You could also attach it to your original post above by clicking the Edit button.

Best regards,
Paul.

sofiane

oK
Best regards

sofiane

i sent you all files in the first comment
thank you at advance
Best regards

Paul Gilman

Hello,

The Tamanrasset.epw weather file is not correctly formatted. There is a problem with the header. The Hassi Rmel.epw file looks ok. You can run the "Solar Resource File Checker" macro to help you find problems with your weather files. (Click the "Macros" button under "Simulate" to display a list of macros.)

There may be a problem with the custom HTF properties you provided. Can you double check the values in the table to make sure they are correct?

The field aperture area seems small for a 100 MW power cycle. You may want to set the Solar Multiple to 1 and allow SAM to size the field based on the power cycle rated capacity.

It appears that you are using an old version of SAM, SAM 2015.6.30. The latest version is SAM 2017.9.5. I would recommend using the latest version.

Best regards,
Paul.

sofiane

OK
I simulated with Therminol VP-1, but i found same problem
Thanks
Best regards

Paul Gilman

You may want to systematically change inputs one by one from their default values to find the problem. First, create a new case, change only the weather file and run a simulation. Then, change the field aperture area and run a simulation. Then change the loop configuration, etc. Otherwise, it can be difficult to isolate the input that is causing the problem.

Best regards,
Paul.

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