Efficiency of engines

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Zenarthra
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#1
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#1
http://www.mpoweruk.com/images/heat_engine.gif

Consider this diagram.
The ideal efficiency would be W x 100 / Qin
This wouldnt be the actual efficiency would it?
because Work is also done to overcome friction and stuff like that right?

Thanks!
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pleasedtobeatyou
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#3
Report 8 years ago
#3
(Original post by Zenarthra)
http://www.mpoweruk.com/images/heat_engine.gif

Consider this diagram.
The ideal efficiency would be W x 100 / Qin
This wouldnt be the actual efficiency would it?
because Work is also done to overcome friction and stuff like that right?

Thanks!

\frac {W}{Q_{in}} \cdot 100 would give you the thermal efficiency of the heat pump.

The ideal efficiency is the Carnot efficiency.

In terms of heat pumps, the work you manage to extract is typically useful work. Work is defined as anything which is equivalent to the raising of a weight.

If you have any more questions, feel free to quote me.
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