negative and zero values

  • Gabo
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26 Aug 2015 13:30 #3661 by Gabo
negative and zero values was created by Gabo
Hi
I'm a student and I'm trying to simulate a power tower with molten salt as HTF, but the hourly energy data retuns negative values and the gross electrical power output displays zeros in many occasions. what could be the reason of this?

Thanks fpr the help

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  • pgilman
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26 Aug 2015 16:26 #3662 by pgilman
Replied by pgilman on topic negative and zero values
Hello,

The power tower system generates no electricity at night after energy is depleted from storage. During those hours, the cycle gross output is zero, and the net output is negative to represent the electricity required to meet parasitic loads.

On the Parasitics page, the "Fraction of rated gross power consumed at all times" accounts for the negative values you see. That represents the electricity requirement of the facility and is not dependent on the system's electrical output.

Also, be aware of any losses specified on the Power Cycle page under "Availability and Curtailment." The default power tower case assumes a 4% loss, which is reflected in the system's electrical output.

Best regards,
Paul.

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