Pump Costing Method
Costing Method Parameters
The following parameters are constructed for the unit on the FlowsheetCostingBlock (e.g., m.fs.costing.pump) when applying the cost_pump costing method in the watertap_costing_package:
Description |
Symbol |
Parameter Name |
Default Value |
Units |
|---|---|---|---|---|
High-pressure pump |
||||
Pump unit cost |
\(C_{pump}\) |
|
1.908 |
\(\text{USD}_{2018}\text{/W}\) |
Low-pressure pump |
||||
Pump unit cost |
\(C_{pump}\) |
|
889 |
\(\text{USD}_{2018}\text{/L/s}\) |
Costing Method Variables
The following variables are constructed on the unit block (e.g., m.fs.unit.costing) when applying the cost_pump costing method in the watertap_costing_package:
Description |
Symbol |
Variable Name |
Index |
Units |
|---|---|---|---|---|
High-pressure pump |
||||
Mechanical work |
\(W_{mech}\) |
|
[t] |
\(\text{W}\) |
Low-pressure pump |
||||
Inlet volumetric flow rate |
\(Q_{in}\) |
|
[t] |
\(\text{m}^3\text{/s}\) |
Capital Cost Calculations
For the high pressure pump , capital cost is dependent upon the mechanical work, \(W_{mech}\), whereas the capital cost of the low pressure pump is based on the volumetric flow rate \(Q_{in}\).
\[C_{cap,high pressure} = C_{pump} * W_{mech}\]\[C_{cap,low pressure} = C_{pump} * Q_{in}\]
Operating Cost Calculations
Electricity \(C_{elec}\) is a variable operating cost based on the energy intensity \(E\) of the unit process (mechanical work for the pump), electricity price \(P\), electricity flow \(Q\), and the plant utilization factor \(f_{util}\). The annual electricity costs are calculated as:
\[C_{op, tot} = C_{elec} = E Q f_{util} P\]