Concepts for estimating pumping energy costs:Systems without static head or closed loop systems

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.

VARIABLE SPEED PUMPING-0735

Related posts:

Compressed Air Transmission and Treatment:Standards and legislation
High pressure:Problems with moisture
Air movers: Types of air mover and Aerodynamic compressors.
Pipelines and valves:Steps
SAFETY VALVES:COOLERS
Low pressure and vacuum:Pressure drop and Maintenance
Introduction to pneumatic conveying and the guide:Definitions and Solids loading ratio
CHARACTERISTICS OF COMPRESSED AIR:DALTON'S LAW
CONTROL VALVES:Rotary Spool Four- Way Valves
Converters:I-P converters and P-I converters.
Definition of terms: Mass and force ,Pressure ,Work, energy and power and Torque.
BASICCONCEPTS OF THE RMODYNAMICS:CLOSED AND OPEN SYSTEMS
THE SECOND LA W OF THERMODYNAMICS:PERPETUAL-MOTION MACHINES
POWER AND REFRIGER A TION CYCLES:BASIC CONSIDERATIONS IN THE ANALYSIS OF POWER CYCLES
FORCED CONVECTION:THERMAL BOUNDARY LAYER

Leave a comment

Your email address will not be published. Required fields are marked *