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So you put extra 1kW heater somewhere in the car. Now how much energy you spend on cooling?
by llukas 10y ago
So you put extra 1kW heater somewhere in the car.
Now how much energy you spend on cooling?
- ak217 10y agoInternal combustion engines are 20-45% efficient. That means a 150 hp car dissipates 55 KW at peak. Assuming half load that's over 25 KW to dissipate continuously. Cars usually dissipate heat by way of a ~100 kg radiator, ram air and a couple of 20W fans. Brakes dissipate far larger amounts of heat in short bursts, and are passively cooled by ram air. For EVs, I'm not sure, but I think 100KW li-ion pack will continuously emit something between 1-5KW in heat when charging or discharging. 1KW is a small fraction of a typical car's heat budget.
- Baeocystin 10y agoI agree with your general point, but to sanity check your numbers: car radiators don't even weigh a tenth of that. The entire cooling system, including fluid, is in the sub-20kg range. The entire drivetrain of a common 4-banger is in the 150-160 kilo range.
- hinkley 10y agoExcept it only takes about 20hp to keep a car at highway speed. The rest is for acceleration, hills, headwinds and looking cool.
- orbifold 10y agoDriving autonomously is pretty cool don't you think...
- ethbro 10y agoSo the first self-driving car should be a 20hp Volkswagen with a computer under the hood. ... I'd buy it!
- hinkley 10y agoWell, in a world where all the cars were automated and could talk to each other (coordinated merges, for instance), you'd probably be fine with 60 hp motors. Where all the vehicles are hybrid, 30 might be enough for highways. Hilly neighborhoods might be something else entirely.
- deleted 10y ago[deleted]