Mixer Costing Method
Costing Method Parameters
The following parameters are constructed for the unit on the FlowsheetCostingBlock (e.g., m.fs.costing.mixer) when applying the cost_mixer costing method in the watertap_costing_package:
Description |
Symbol |
Parameter Name |
Default Value |
Units |
|---|---|---|---|---|
Standard mixer |
||||
Mixer unit cost |
\(C_{mix, standard}\) |
|
361 |
\(\text{USD}_{2018}\text{/L/s}\) |
NaOCl mixer |
||||
Mixer unit cost |
\(C_{mix, NaOCl}\) |
|
5.08 |
\(\text{USD}_{2018}\text{/m}^{3}\text{/day}\) |
NaOCl cost |
\(C_{NaOCl}\) |
|
0.23 |
\(\text{USD}_{2018}\text{/kg}\) |
NaOCl purity |
\(p_{NaOCl}\) |
|
0.15 |
\(\text{dimensionless}\) |
CaOH2 mixer |
||||
Mixer unit cost |
\(C_{mix, CaOH2}\) |
|
873.911 |
\(\text{USD}_{2018}\text{/kg/day}\) |
CaOH2 cost |
\(C_{CaOH2}\) |
|
0.12 |
\(\text{USD}_{2018}\text{/kg}\) |
CaOH2 purity |
\(p_{CaOH2}\) |
|
1 |
\(\text{dimensionless}\) |
Costing Method Variables
The following variables are constructed on the unit block (e.g., m.fs.unit.costing) when applying the cost_mixer costing method in the watertap_costing_package:
Description |
Symbol |
Variable Name |
Index |
Units |
|---|---|---|---|---|
Inlet volumetric flow rate |
\(Q_{in}\) |
|
[t] |
\(\text{m}^3\text{/hr}\) |
Lime mass flow |
\(M_{in}\) |
|
[t] |
\(\text{kg/day}\) |
Dosing rate |
\(D\) |
|
[j] |
\(\text{kg/s}\) |
Capital Cost Calculations
Capital cost is dependent upon the volumetric flow rate, \(Q_{in}\), or lime mass flow, \(M_{in}\), as shown in the equations below.
“Standard mixer”
\[C_{cap,tot} = C_{mix, standard} * Q_{in}\]“NaOCl mixer”
\[C_{cap,tot} = C_{mix, NaOCl} * Q_{in}\]“CaOH2 mixer”
\[C_{cap,tot} = C_{mix, CaOH2} * M_{in}\]
Operating Cost Calculations
The total operating cost is dependent upon the dosing rate, \(D\), as shown in the equations below.
“Standard mixer”
\[C_{op,tot} = 0\]“NaOCl mixer”
\[C_{op,tot} = D_{NaOCl} * C_{NaOCl} / p_{NaOCl}\]“CaOH2 mixer”
\[C_{op,tot} = D_{CaOH2} * C_{CaOH2} / p_{CaOH2}\]