Negative annual energy

  • Francesca
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12 Nov 2020 15:06 #8993 by Francesca
Negative annual energy was created by Francesca
Dear Paul,

I designed a molten salt power tower model, where use the 'optimize heliostat layout', then try to simulate the amount the energy that is produced from the design per year. But I just got a negative value like -3377281KWh. Could you explain that is there any reason that would cause a negative number ? 

Best regards,
Francesca

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  • Paul Gilman
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13 Nov 2020 23:29 #9001 by Paul Gilman
Replied by Paul Gilman on topic Negative annual energy
Hi Francesca,

Can you attach a copy of the .sam file that generates those negative results?

Best regards,
Paul.

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  • Francesca
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15 Nov 2020 13:29 #9004 by Francesca
Replied by Francesca on topic Negative annual energy
Dear Paul,

Here is the file. I'm using SAM 2015.1.30.  Please help me have a look at this model. Thank you.

Best regards,
Francesca
Attachments:

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  • Paul Gilman
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16 Nov 2020 17:08 #9007 by Paul Gilman
Replied by Paul Gilman on topic Negative annual energy
Hi Francesca,

The Power Cycle input parameters "Estimated Gross to Net Conversion Factor" and "Rated Cycle Conversion Efficiency" are both set to 1. Changing those to a more realistic 0.9 and 0.4, respectively, results in positive annual energy.

Best regards,
Paul.

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