Molten salt power tower with no storage

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antonio.avila
Molten salt power tower with no storage

Hello Paul,
I would like to know how does a molten salt power tower behaves when there is no thermal storage:
- How do you manage the parasitics losses of keeping the salts at constant temperature during transient or night periods?,
- Do I have to include any factor in the parasitic slide?,
- For the calculation of the LCOE, I supposed I have to consider or the construction of a buffer tank to storage the receiver salts (where you drained it during night periods) or the extra cost of using fossil burners or electric heat tracing.

On the other hand, I have checked the direct steam generation system. I observe you consider the same parasitic losses for the system as for the molten salt power tower. I am a little worried because I have done several simulations with defaults values for both technologies without storage and I get similar parasitic efficiencies. Could you give me any clue?

Thanks in advance.
Antonio

antonio.avila

Dear Paul,
With respect to the first issue checking Delsol manual appear the formula for the cost construction of a drainage tank to be include in the LCOE. The parasitics losses about keeping the salts at a constant temperature during transient or night periods is not a big issue if you have a goog isolated tank, as Gemasolar one (<1ºC losses/per day), and it is considered in the parasitic tab.
For the direct steam generation, obviously I saw that you did not consider the losses about the heat transfer fluid, but it is true that I run a steam power tower with very low flux in the receiver, reulting in very large receiver surface, large amount of heliostat, and consequently large parasitic losses. If I consider the default maximum solar fluxes in SAM (800-500-350 kW/m2), the results are much more better.
Sincerely.
Antonio

Paul Gilman

Dear Antonio,

I think you found the answers to your questions. Thank you for sharing them on the forum.

Best regards,
Paul.

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