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:
Benefits, drawbacks and operational issues:Resonance and rotor dynamics
Pumps:Reciprocating pump types
Objectives of the guide
Health and safety:Dust risks, Dust emission and Dust as a health hazard.
Operating problems:Combined systems
Material property influences:Dicalcium phosphate
BASIC HYDRAULICS:USE OF HYDRAULICS
Hydraulic pumps:Gear pump.
Hydraulic accumulators.
Safety, Fault-Finding and Maintenance:safety
BASICCONCEPTS OF THE RMODYNAMICS:STATE AND EQUILIBRIUM
THE FIRST LAW OF THERMODYNAMICS:THE FIRST LAW OF THERMODYNAMICS
ENTROPY:WHAT IS ENTROPY?
POWER AND REFRIGER A TION CYCLES:THE IDEAL VAPOR-COMPRESSION REFRIGERATION CYCLE
INTRODUCTION TO FLUID MECHANICS:VISCOSITY