Quote:
reducing the exhaust temp by using water or something to cool it wont increase the engines effieciency. it needs to be cool to start with, but as combustion takes place in a combustion engine (imagine that ay?) its hot to begin with.
I don't think anybody was implying this.
I'd say some of you have but for others i'd suggest reading up about the carnot cycle. It's basically an ideal heat pump (car engine) and you can use this theory to work out the maximum efficiency for any engine. What it basically says is that the maximum efficiency for a heat pump is (T(high) - T(low)) / T(high). where T high is the temp at which your fuel burns at and T low is your low temp reservior (ambient). For this you need to work in degrees Kelvin (add 273).
For instance lets say it's 20 degrees ambient and your fuel burns at 1000 degrees. That makes
(1273 - 293)/1273 = 77%
Already we have lost 23% just through the design of our entropic universe!!
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