How Does a Gasoline Engine Manage Heat?

[ziddy83]

hey what's up guys, I need some help solving a homework problem for physics...
here is the question.
A gasonline engine has a power output of 180 kW (241hp). Its thermal efficiency is 28%.

a) How much heat must be supplied to the engine per second?
b) How much heat is discarded by the engine per second?

I know this is probably a simple question, but I am kind of having a hard time with this chapter. I know that thermal efficiency is equal to work/Qh...and after that...i need a little help. Thanks for any help.

 

[ziddy83]

Can Anyone help? Thats all that was given in the question...

 

[OlderDan]

hey what's up guys, I need some help solving a homework problem for physics...
here is the question.
A gasonline engine has a power output of 180 kW (241hp). Its thermal efficiency is 28%.

a) How much heat must be supplied to the engine per second?
b) How much heat is discarded by the engine per second?

I know this is probably a simple question, but I am kind of having a hard time with this chapter. I know that thermal efficiency is equal to work/Qh...and after that...i need a little help. Thanks for any help.

If only 28% of the energy supplied is converted to mechanical energy, what percent is not converted to mechanical energy? Power is just the rate of energy supplied/converted, so ask the same question about the power. Work your way back to figure out how much power must be supplied.