Systems without static head or closed loop systems
The specific energy here is dependent on the frictional head loss which, in turn, is determined by the losses in the pipe system (including throttling valves), and by the combined drive-motor-pump efficiency.
The combined drive-motor-pump efficiency has to be evaluated for each duty point. It is to be noted that the pump efficiency remains approxi mately the same in a system of this type when the speed is changed, whereas the drive-motor efficiency can drop drastically as the load is reduced. If on the other hand, the system curve is changed by changing the setting of a valve, this will change the duty point of the pump and, hence, its efficiency.
Related posts:
Motors:Alternative electrical designs of motors
Applied Pneumatics:Flow analysis for cylinders and valves
Pipelines and valves:Isolating valves and Butterfly valves
Particle degradation:Operating problems and Filtration problems
Operating problems:Rotary valves and Flow control
Low pressure and vacuum:Gate lock valves
Hydraulic accessories:Flexible hoses.
Coarse material:Procedure and Operating point.
ROUBLESHOOTING PNEUMA TIC CIRCUITS:TROUBLESHOOTING PNEUMATIC CIRCUITS
ACTUATORS:PISTON Roo COLUMN STRENGTH AND HYDRAULIC CYLINDER FORCES.
Fundamental Principles:Fundamental Principles
Fundamental Principles:fluId flow
THE SECOND LA W OF THERMODYNAMICS:INTRODUCTION TO THE SECOND LAW
POWER AND REFRIGER A TION CYCLES:THE BRAYTON CYCLE WITH REGENERATION
FORCED CONVECTION:GENERAL THERMAL ANALYSIS