Does brake horsepower include volumetric efficiency?
Does brake horsepower include volumetric efficiency?
(OP)
Hello Everybody,
If I had to answer my question, I would say YES but I haven't found any standard where this is explicitly described. I checked Hydraulic Institute and also API 675 but couldn't find an answer. I remember that there is one power definition which does not include the volumetric efficiency of a pump (means the power calculation bases upon 100 % filling) but I cannot recall which one it is. Can anybody help and name the corresponding reference? Thank you in advance!
Michael
If I had to answer my question, I would say YES but I haven't found any standard where this is explicitly described. I checked Hydraulic Institute and also API 675 but couldn't find an answer. I remember that there is one power definition which does not include the volumetric efficiency of a pump (means the power calculation bases upon 100 % filling) but I cannot recall which one it is. Can anybody help and name the corresponding reference? Thank you in advance!
Michael





RE: Does brake horsepower include volumetric efficiency?
Dejan IVANOVIC
Process Engineer, MSChE
RE: Does brake horsepower include volumetric efficiency?
RE: Does brake horsepower include volumetric efficiency?
Dejan IVANOVIC
Process Engineer, MSChE
RE: Does brake horsepower include volumetric efficiency?
Pump efficiency is a comparison of how much power you would need to lift a perfect fluid a given distance with no mechanical losses vs. actual power used for the actual fluid and the same distance. So if there were no mechanical losses, the only remaining factor is deviation from a perfect fluid (i.e., volumetric efficiency). Like Dejan says, volumeteric efficiency is included in the flow rate term.
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: Does brake horsepower include volumetric efficiency?
It is not of any actual importance for me but it is thing that is on my mind for weeks now, like an actor you have seen in a movie but do not recall her/his name for days.
RE: Does brake horsepower include volumetric efficiency?
Equivalent term would be Hydraulic Input Power. Karassik uses the term "BHP with zero slip" (see attached page from the pump handbook).
Dejan IVANOVIC
Process Engineer, MSChE
RE: Does brake horsepower include volumetric efficiency?
RE: Does brake horsepower include volumetric efficiency?