Parabolic Trough Physical Model - Sizing geometry error

  • Mominah Ahmad
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14 Jun 2021 04:42 #9701 by Mominah Ahmad
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:
Code:
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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  • Paul Gilman
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14 Jun 2021 10:44 #9702 by Paul Gilman
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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  • Weng Pin Wong
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28 Jul 2021 08:16 #9886 by Weng Pin Wong
Hi Mominah Ahmad,
May I know how do you solve this issue?

Dear Paul,
May you advise on how to solve this problem?

Best regards, 
Weng Pin.

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