Flow charts
Flow charts to assess the suitability of a VSD for a pump system are shown in Figures 9.1 for rotodynamic pumps and 9.2 for positive displacement
pumps. These are based on using a variable frequency drive, which will be more efficient than any speed control device, which uses slip to vary the speed. Having established that using a VFD is appropriate, Figure 9.3 is a flow chart for selecting the correct drive and making the life cycle cost calculation. Chapter 12 will help in making the financial justification.
Appendix A2.4 contains information on the factors to be considered in sizing a drive.
Related posts:
Variable speed drives:Power drive systems
Concepts for estimating pumping energy costs:Flow regulation by varying speed
System and process requirements:Supply and demand controlled systems
Air flow rate evaluation:Volumetric flow rate
BASIC PRINCIPLES:GAS LAWS AND THERMODYNAMICS.
BASIC DIAGRAMS AND SYSTEMS:ACCUMULATOR SAFETY CIRCUITS
Low pressure and vacuum:Pressure drop and Maintenance
Design procedures:Logic diagram for system design
CONTROL VALVES:VALVE CLASSIFICATIONS
Control components in a hydraulic system:Pressure control valves
BASIC HYDRAULICS:USE OF HYDRAULICS
Control components in a hydraulic system:Hydraulic fuses.
Hydraulic and Pneumatic Accessories:Hydraulic accumulators
Safety, Fault-Finding and Maintenance:cleanliness
NATURAL CONVECTION:NATURAL CONVECTION FROM FINNED SURFACES AND PCBs