Diesel engine efficiency

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Is a Diesel engine more efficient in cold weather or warm weather? Why?
Thx.

[jake-the-peg]

In general a Heat engine is more efficient in cold weather because the thermal efficiency is 1-Texhaust/Tin where Tin is the temperature that the air enters at and Texhaust is the temperaure it leaves.

[scotman]

For all heat engines the Carnot Efficiency is defined as shown on the following link


http://www.engineerin...fficiency-d_1047.html

[jake-the-peg]

Which if you rearrange it is what I said - but is there something special about a diesel engine?

[jake-the-peg]

OK the answer stands - it looks like it's because a diesel engine is a better model of a heat engine

http://hyperphysics.p...se/thermo/diesel.html

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Thanks dudes