4 ms·
25hp = 19kW or ~1x standard 42U rack, 105hp = 78kW or 20x typical households. Cars are powerful machines!
by numpad0 3y ago
25hp = 19kW or ~1x standard 42U rack, 105hp = 78kW or 20x typical households. Cars are powerful machines!
- Retric 3y agoThat’s the useful work which represents ~1/3 of the energy in gasoline. ICE cars needs to deal with ~2x that energy in waste heat.
- Baeocystin 3y agoA good rule of thumb is 1/3 of the energy into mechanical work, 1/3 into the cooling system, and 1/3 out the tailpipe. The actual numbers are pretty close to this across a wide range of operating conditions.
- Retric 3y agoWith the caveat that in cars the very long exhaust system dissipates a great of the heat rather than all of that energy literally coming out of the tailpipe as hot gas. Also catalytic converters provide more complete combustion and thus generate even more heat.
- AtlasBarfed 3y agoWell, heat your water with it. In addition, I don't see why you wouldn't just buy a home battery pack and use that to store up energy. You can run the ice in the high power bursts to top off. I just kind of like this post because there's going to be a lot of excess ICE engines out there once EVs take over the primary job of consumer transport. Would be nice to have a DIY recipe to convert them over to leveling for your solar grid at home
- numpad0 3y agoIIUC the significant fractions of heat can't be absorbed, else it eats into efficiency, which is okay if part of the purpose of the engine is for heat - I think he's just pointing out the hydrocarbon-to-kinetic conversion ratio is around 1/3rd, which is a useful rule of thumb.
- AtlasBarfed 3y agoThat seems a little bit nuts considering what they're doing with passive heat exchangers right now. Waste heat from an ICE must be way more useful than a simple 10 or 20° gradient that they're trying to use for house heating and cooling