Hi Julian,
Those variables are outputs of the performance model that are also inputs to the financial model. The errors indicate that the performance model simulation failed.
In the file you attached, the "IPH Trough Barranca MS 31Oct23" case has parametric simulations set up for a range of target solar multiples between 1.5 and 4. Runs 1, 3, 4, 5, and 6 generate errors, but Run 2 does not. The "IPH Trough Cartagena MS 06Nov23" parametric runs for a range of collector tilt angles do not generate any errors.
To investigate, I tried setting the Target Solar Multiple value on the System Design page to 1.5 and clicking Simulate. That generates a more detailed simulation message about defocus and fluid velocity.
Some suggestions for resolving the issue:
- On the System Design page, set the Design Point DNI to 850 W/m2 instead of 400. This is closer to the maximum DNI (beam irradiance) value in the weather file.
- On the Solar Field page, try increasing the Max Single Loop Flow Rate to 15 kg/s and using 8 SCA/HCE assemblies per loop instead of 6.
You might also use the default values of inputs for the Linear Fresnel Molten Salt and Parabolic Trough - Physical models as a guide for choosing values for your system.
Best regards,
Paul.
