175 reputation
217
bio website theug.ru/en
location Boise, ID
age 33
visits member for 1 year, 11 months
seen May 27 at 3:29

CS student at Boise State. Took general two-semster physics course. Father has a degree in nuclear physics from Moscow State University in Russia.

Support Motorcycles, Mopeds and Scooters and Recreational Boating on SE Area 51.


May
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Sep
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accepted Calculating engine starter’s energy use
Sep
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revised Calculating engine starter’s energy use
Cleaned up formulae, spaces between numbers and units.
Sep
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suggested suggested edit on Calculating engine starter’s energy use
Sep
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comment Calculating engine starter’s energy use
That was me. The calculations, actually, stayed the same, save for the 1.8 L correction — they were exactly as you now updated. :) Mind if I re-edit fancy formulae and SI conversions?
Aug
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suggested suggested edit on Calculating engine starter’s energy use
Aug
29
revised Are there rogue planets between Sun and Proxima Centauri?
Typos, and our sun is Sun (proper name), not generic “a sun”.
Aug
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suggested suggested edit on Are there rogue planets between Sun and Proxima Centauri?
Aug
29
comment Calculating engine starter’s energy use
By the way, in terms of numbers, the fact that under load alternators and generators produce slightly over 14V to facilitate charging and all that jazz — would it affect a calculation in a meaningful way? I understand the outcome is not going to change, just the precision I am worried about.
Aug
29
comment Calculating engine starter’s energy use
@user6972, actually many manufacturers are switching to electromechanical AC units just as they switching to electromechanical power steering — more efficient. I don’t have the link to back that up right now, but believe you me. :D
Aug
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comment Calculating engine starter’s energy use
Judging by some power curves for 4-cylinder engines, idling makes around 25-40 kW or around 20-25% of the max power.
Aug
28
comment Calculating engine starter’s energy use
Not really, no. But a good example with ubiquitous engine would be helpful. That very Civic, for instance. And I think important part in the calculations is to keep the engine power output realistic — nobody is going to sit on the red light with throttle fully depressed producing 100 kW. And I hope I don’t discourage you with my comments — I’m not being picky, but trying to crystallize the best answer it could possibly be.
Aug
26
comment Calculating engine starter’s energy use
Not sure about multiple days. Headlights left on can kill the car in a few hours (still hours, so not a problem for start-stop). And what about any efficiency losses? For instance, 100 kW motor consumes so many joules per second — say, it makes 25 kW at idle, then it ideally consumes 25 kJ of energy per second, but how many Joules of fuel is consumed to produce those 25 kW?
Aug
25
comment Calculating engine starter’s energy use
Good edit. Let’s see how people vote on that during the week, and if there are other comments or answers. Although there’s one more thing — what about consumption from lights, radio, electromechanical AC that would run while the engine is stopped? Would they be on the same level of insignificance as the starter’s use?
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