1
$\begingroup$

I often see the term "net mechanical efficiency" used in literature, but I am not quite sure what it means, and what the difference is between it and "normal" efficiency. Take this sentence for example: ... increased the effectiveness, while reducing net mechanical efficiency. What does exactly does this mean?

$\endgroup$
1
$\begingroup$

Mechanical efficiency is usually used as a metric to account for frictional losses in systems. For example, the transmission of a car transmits mechanical work from the engine to the wheels so the mechanical efficiency of the system will be $W_{transmitted}/W_{received/ideal}$. Even within an engine, there is friction between the piston and cylinder walls, bearings of crankshafts etc. Mechanical efficiency is: $W_{output}/W_{obtained\;from\; gas}$. The denominator is the work obtained from the work-fluid, the thermodynamic cycle. Therefor it is a way to quantify the frictional loses in the system.

What I have mentioned above is one of the common use of this term, but there could be other definitions too. You need to look into the context of usage

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.