Quote:
Originally Posted by teoman
I takes 2.2 MJ to vaporize 1 kg of water.
1 kg of gasoline has about 46MJ of energy.
Havent had a look at all the steam table pressure graphs yet, but purely from an energetic point of view, every unit of water by mass cancels out about 0.05 units of fuel.
Energy is used up to vaporize the water. After that both n2 and h2o compete for the thermal energy and expand.
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I have my own observations on Water-Injection, developed from years of continual operation.
Whilst it takes energy to vaporise the water, it was heat energy that the engine was going to throw away anyway.
Adding water will simply convert extra heat that is there and not really wanted into kinetic piston driving energy so that the heat is not flushed out the radiator and muffler as it is on a normal car.
So you can win in fuel efficiency using water-injection.
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius
