Thermal TES freeze protection in trough phys.

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F.Haag
Topic Author

31 Oct 2015 14:36 #3881 by F.Haag

Thermal TES freeze protection in trough phys. was created by F.Haag

Hello Paul,

in my parabolic trough plant (phys.) simulation the parasitic thermal TES freeze protection makes a massive peak while not reaching the tank heater set point (see attached image). Is there anything besides the tank temperature which affects the heater setting?

Thank you and best regards!

Florian

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Paul Gilman

02 Nov 2015 18:18 #3882 by Paul Gilman

Replied by Paul Gilman on topic Thermal TES freeze protection in trough phys.

Dear Florian,
Chapter 4.1.3 of the physical trough reference manual (available here ) describes how SAM calculates the storage freeze protection energy. It is limited by either the tank heater temperature set point, or by the maximum heating rate. In the case you show, it looks like the heating rate is limiting the temperature of the storage fluid.
Best regards,

Paul.

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F.Haag
Topic Author

02 Nov 2015 18:42 #3883 by F.Haag

Replied by F.Haag on topic Thermal TES freeze protection in trough phys.

Thank you!

But I'm not sure how to understand the heating rate equation. Is there a way to avoid these peaks in the parasitic of TES?

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Paul Gilman

03 Nov 2015 17:00 #3884 by Paul Gilman

Replied by Paul Gilman on topic Thermal TES freeze protection in trough phys.

Dear Florian,
Would you mind [url=mailto:sam.support@nrel.gov?subject=Physical%20trough%20freeze%20protection t=_self]emailing me[/url] your .sam file so we can investigate this further?
Best regards,

Paul.

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