Dec 252012
 

Pump efficiencyPump Efficiency is a measure of performance of a hydraulic pump. Pump efficiency can be found by finding the following three efficiencies:

  1. Mechanical Efficiency
  2. Volumetric Efficiency
  3. Overall Efficiency

Mechanical Efficiency of a Pump (ηm):

Mechanical efficiency of a pump (ηm) is the ratio of theoretical power that must be supplied to operate the pump to the actual power delivered to the pump.

Mechanical~Efficiency~=~{{Theoretical~power~that~must~be~delivered~to~a~pump}/{Actual~power~delivered~to~the~pump}}*100%

Mechanical efficiency can be used to determine the power lost in bearings and other moving parts of a pump. It determines the actual power that must be supplied to a pump.

Volumetric Efficiency of a Pump (ηv):

Volumetric efficiency of a pump (ηv) is defined as the ratio of the actual flow rate delivered by the pump to the theoretical flow rate (i.e., flow rate without any leakage) that must be produced by the pump.

Volumetric~Efficiency~=~{{Actual~flow~rate~produced~by~a~pump}/{Theoretical~flow~rate~that~must~be~produced~by~the~pump}}*100%

Volumetric efficiency can be used to determine the amount of liquid lost, due to leakage, in a pump.

Overall Efficiency of a Pump (ηo):

Overall efficiency of a pump (ηo) is the ratio of the actual power output of a pump to the actual power input to the pump. It is the efficiency that determines the overall energy loss in a pump.

Overall~Efficiency~=~{{Actual~power~output~of~a~pump}/{Actual~power~input~to~the~pump}}*100%

Overall efficiency is essentially a combination of volumetric efficiency and mechanical efficiency. It is the product of volumetric efficiency and mechanical efficiency of a pump.

Overall efficiency = Mechanical Efficiency × Volumetric Efficiency

ηo = ηm × ηv

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I am a mechanical engineer with a passion for technical stuff. I am the founder and former editor-in-chief of Mechteacher.com.