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System Advisor Model (SAM)

Parabolic Trough Physical Model - Sizing geometry error

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mominahahmad
Topic Author

14 Jun 2021 10:42 #9701 by mominahahmad

Parabolic Trough Physical Model - Sizing geometry error was created by mominahahmad

Hi, I am trying to simulate PTC-physical model with Solar Multiple of '3' and TES of 8 hours, the design point DNI is 708 W/m2, with rest of the parameters set as default. I am getting the following error:

exec fail(trough_physical): C_csp_trough_collector::off - freeze protection failed to converge
Simulation trough_physical failed :Piping geometry file
Maximum fluid velocity: 3.00
Minimum fluid velocity: 2.00
To section 1 header pipe diameter: 1.3208 m (52.00 in)
To section 2 header pipe diameter: 1.3208 m (52.00 in)
To section 3 header pipe diameter: 1.3208 m (52.00 in)
To section 4 header pipe diameter: 1.3208 m (52.00 in)
Loop No. | Diameter [m] | Diameter [in] | Diam. ID
--------------------------------------------------
     1   |    0.6350    |    25.0000     |   1
     2   |    0.6350    |    25.0000     |   1
     3   |    0.6350    |    25.0000     |   1
     4   |    0.6350    |    25.0000     |   1
     5   |    0.6350    |    25.0000     |   1
     6   |    0.6350    |    25.0000     |   1
     7   |    0.6350    |    25.0000     |   1
     8   |    0.6350    |    25.0000     |   1
     9   |    0.6350    |    25.0000     |   1
    10   |    0.6350    |    25.0000     |   1
    11   |    0.6350    |    25.0000     |   1
    12   |    0.6350    |    25.0000     |   1
    13   |    0.6350    |    25.0000     |   1
    14   |    0.7811    |    30.7500     |   2
    15   |    0.7811    |    30.7500     |   2
    16   |    0.7811    |    30.7500     |   2
    17   |    0.7811    |    30.7500     |   2
    18   |    0.7811    |    30.7500     |   2
    19   |    0.7811    |    30.7500     |   2
    20   |    0.7811    |    30.7500     |   2
    21   |    0.7811    |    30.7500     |   2
    22   |    0.7811    |    30.7500     |   2
    23   |    0.7811    |    30.7500     |   2
    24   |    0.7811    |    30.7500     |   2
    25   |    0.7811    |    30.7500     |   2
    26   |    0.7811    |    30.7500     |   2
gen not assigned
Simulation grid failed :gen not assigned
SSC requires input 'annual_energy', but was not found in the SAM UI or from previous simulations
Simulation lcoefcr failed :precheck input: variable 'annual_energy' (Annual energy production) required but not assigned

Can you please explain why is it giving this error?

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pgilman

14 Jun 2021 16:44 #9702 by pgilman

Replied by pgilman on topic Parabolic Trough Physical Model - Sizing geometry error

Hi Mominah Ahmad,

This message is from the piping model, which is described in Section 2.5 of Wagner (2011) "Technical Manual for the SAM Physical Trough Model," available here: sam.nrel.gov/concentrating-solar-power/csp-publications.html.

This error indicates that given the design solar field mass flow rates and other input parameters, the piping model was unable to determine a selection of piping diameters (See Section 2.5.1 in the manual).

Best regards,
Paul.

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