eq. (A.352)
This operation models transport of fluids using a centrifugal pump, a gear pump or a diaphragm pump.
● Pumping by a Centrifugal Pump Procedure
In Design Mode, the user specifies the desired pressure change (ΔP) and the model calculates the required power supply using the following equation:
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eq. (A.352) |
where Q is the volumetric flow rate and η is the total efficiency (including pump and driver efficiencies). If the calculated power exceeds the maximum, the program assumes multiple units operating in parallel with a total power requirement equal to the calculated.
In Rating Mode, the user specifies the power supply and the number of units operating in parallel and the program calculates the pressure change.
The following simple energy balance is used to find the outlet temperature:
Outlet Enthalpy = Inlet Enthalpy + Lost Power Dissipated To Heat
The Lost Power Dissipated To Heat is calculated by multiplying the lost power by the (Lost Power Dissipated to Heat) %. The lost power is the difference between power supply and power output (Q*ΔP) and it can be calculated by multiplying the power supply by (1-η).
1. Ulrich, G.D. (1984). A Guide to Chemical Engineering Process Design and Economics, John Wiley & Sons.
The interface of this operation has the following tabs:
● Oper. Cond’s, see Pumping Operations: Oper. Conds Tab
● Labor, etc, see Operations Dialog: Labor etc. Tab
● Description, see Operations Dialog: Description Tab
● Batch Sheet, see Operations Dialog: Batch Sheet Tab
● Scheduling, see Operations Dialog: Scheduling Tab