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:Variable speed drive on a circulating pump in a batch process
Concepts for estimating pumping energy costs:Flow regulated by throttling
Pumps:Positive displacement pumps
Air only relationships:Venturi analysis and High pressure applications.
CONTROL VALVES:SHUTTLE VALVES
COMPRESSORS:Design Fundamentals
ACTUATORS:HYDRAULIC CYLINDERS
HYDRAULIC FLUIDS:HYDRAULIC FLUID SAMPLING
Sequencing Applications:Pneumatic limit switches
Safety, Fault-Finding and Maintenance:fault-finding
INTRODUCTION AND OVERVIE:ENGINEERING SOFTWARE PACKAGES
BASICCONCEPTS OF THE RMODYNAMICS:CLOSED AND OPEN SYSTEMS
BASICCONCEPTS OF THE RMODYNAMICS:STATE AND EQUILIBRIUM
PROPERTIES OF PURE SUBSTANCES:INTERNAL ENERGY, ENTHALPY, AND SPECIFIC HEATS OF IDEAL GASES
SUMMARY OF ENTROPY