Update Costing in Dye Desal Flowsheet #1485
Conversation
MarcusHolly
changed the title
| m.fs.brine_cost = Expression( | ||
| expr=( | ||
| -1 | ||
| * m.fs.zo_costing.utilization_factor |
There was a problem hiding this comment.
Is the zero order costing utilization factor same as ro.costing? Can you tell me some background why we need to use zero order costing in this flowsheet?
There was a problem hiding this comment.
Yes, both utilization factors are set to 0.85. Zero order costing is needed to cost the ZO nanofiltration and pump models The dye_desalination_global_costing.yaml file is also linked to the zero order costing and provides values like dye_disposal_cost, recovered_water_cost, electricity_cost, etc.
|
Just as a reminder for both of us--should double-check capital recovery factor values for both ZO and "detailed" costing packages and ensure that they are equivalent and line up with what was used for analyses. |
I've set the capital recovery factor for ro_costing to 0.065, which is the value used by the zo_costing and our analyses |
| m.fs.ro_costing.base_currency = pyunits.USD_2020 | ||
| m.fs.ro_costing.utilization_factor.fix(0.85) | ||
| # Assume the same capital recovery factor as zo_costing | ||
| m.fs.ro_costing.capital_recovery_factor.fix(0.065051435) |
There was a problem hiding this comment.
@MarcusHolly any reason why we don't just point to the variable itself to get the value instead of hard-coding here?
There was a problem hiding this comment.
Nope - I'll update this
Co-authored-by: Adam Atia <[email protected]>
| if value(m.fs.brine_cost) > 0: | ||
| return pyunits.convert( | ||
| m.fs.brine_cost, | ||
| to_units=pyunits.USD_2020 / pyunits.year, |
There was a problem hiding this comment.
Something to keep in mind for subsequent PR and report modifications: would be good to move away from 2020 currency since it's more of an anomaly.
There was a problem hiding this comment.
@adam-a-a So what should be used instead?
Fixes/Resolves:
Updates the dye desal flowsheet in preparation for a report
Changes proposed in this PR:
Legal Acknowledgement
By contributing to this software project, I agree to the following terms and conditions for my contribution: