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.
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PNEUMATIC SEALS
Air only relationships:Venturi analysis and High pressure applications.
Air flow rate evaluation:Supply pressure and Volumetric flow rate.
Basic principles:nomenclature and units
Low pressure and vacuum:Screw feeders and The simple screw feeder.
Hydraulic fluids:Neutralization number
Seals: Rotary actuators and Constructional details.
Control valves.
Hydraulic Pumps and Pressure Regulation
PROPERTIES OF PURE SUBSTANCES:INTERNAL ENERGY, ENTHALPY, AND SPECIFIC HEATS OF IDEAL GASES
THE SECOND LA W OF THERMODYNAMICS:THE CARNOT CYCLE
ENTROPY:ENTROPY BALANCE
SUMMARY OF ENTROPY