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:
Case studies:VSD installation and commissioning Borehole pump
Applications on pneumatic:AIR MOTORS
Compressed Air Transmission and Treatment:Tool lubrication
Energy and Efficiency:Theory of two level systems
Air only relationships:Stepped pipelines and Air only pressure drop.
System selection considerations:Material compatibility and Design curves.
Gas–solid separation devices:Separation requirements and Separation mechanisms.
Pressure and flow:Pressure in fluids
First approximation design methods:Empirical relationships
Optimizing and up-rating of existing systems:Optimizing existing systems
Control components in a hydraulic system:Flovvrneters.
Hydraulic and Pneumatic Accessories:environmental fluids
PROPERTIES OF PURE SUBSTANCES:THE IDEAL-GAS EQUATION OF STATE
POWER AND REFRIGER A TION CYCLES:BASIC CONSIDERATIONS IN THE ANALYSIS OF POWER CYCLES
FORCED CONVECTION:GENERAL CONSIDERATIONS FOR PIPE FLOW