Energy Recovery Device Costing Method
Costing Method Parameters
The following parameters are constructed for the unit on the FlowsheetCostingBlock (e.g., m.fs.costing.energy_recovery_device) when applying the cost_energy_recovery_device costing method in the watertap_costing_package:
Description |
Symbol |
Parameter Name |
Default Value |
Units |
|---|---|---|---|---|
Pressure exchanger unit cost |
\(C_{PX}\) |
|
535 |
\(\text{USD}_{2018}\text{/m}^3\text{/hr}\) |
Costing Method Variables
The following variables are constructed on the unit block (e.g., m.fs.unit.costing) when applying the cost_energy_recovery_device costing method in the watertap_costing_package:
Description |
Symbol |
Variable Name |
Index |
Units |
|---|---|---|---|---|
Inlet volumetric flow rate |
\(Q_{in}\) |
|
[t] |
\(\text{m}^3\text{/hr}\) |
Capital Cost Calculations
Capital cost is dependent upon the volumetric flow rate, \(Q_{in}\), as shown in the equation below.
\[C_{cap,tot} = C_{PX} * Q_{in}\]
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 ERD), electricity price \(P\), electricity flow \(Q\), and the plant utilization factor \(f_{util}\). The annual electricity costs are calculated as:
\[C_{op, tot} = C_{elec} = E Q f_{util} P\]