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:
Actuators:selection and performance of cylinders
Applications on pneumatic:Mining and quarrying equipment.
Gas–solid separation devices:Dust control and Particle degradation
System selection considerations:System economics and Material considerations
Review of pneumatic conveying systems:Material property influences
Fine material:Conveying data
Design procedures:The use of test data in system design
HYDRAULIC PUMPS:Vane Pumps
Hydraulic motors:Piston motors.
Process control valves and actuators:Flow control valves ,Actuators and Valve positioners.
Hydraulic piping, hosing and connections.
Fluid flow.
Fundamental Principles:temperature measurement
INTRODUCTION AND OVERVIE:HEAT TRANSFER
SUMMARY OF POWER AND REFRIGER A TION CYCLES