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Lawn and Garden
Reply to "Help! My Ego electric mower won't start "
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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]Contemplating a typical fossil-fuel-burning plant as the source: 10% is lost in combustion (not transferred to steam), 60% is lost at the turbine, 10% is lost in transmission, 20% is lost charging, 10% is lost discharging, and 10% is lost in the motor… so it ends up about 21% efficient - that is to say, ~79% of the energy in the source oil goes to waste (heat).[/quote] :roll: Nerd![/quote] Nerd? Someone explains in perfect, accurate detail why your fetishized electric mowers are 60% LESS energy efficient than a gas mower, and you respond by calling them names. Let's explain it another way then. A more simple way, that even you can understand: [b]Your battery powered electric mower is causing 60% MORE carbon pollution than a gasoline powered mower. [/b] I'm a mechanical engineer. I understand things like energy transfer and thermal efficiency. I also have a deep and abiding concern for the health of this planet. And that's why I own a gasoline powered mower. Because it uses less resources and creates less pollution per unit of work than an electric mower. This is SCIENCE. [/quote] I haven't run the numbers on carbon pollution, but it's laughable to suggest that a gas mower creates less pollution than an electric mower when you consider other pollutants like NOx. Even taking into account the transmission losses etc, the idea that a single stroke engine can be as efficient as a modern power plant is just nonsense. Even a car is something like 6-10 times cleaner than a lawnmower simply on a per mile basis and the car is doing a lot more work. And congrats to the OP on getting it resolved at least. :)[/quote] Sorry, but you're wrong. Thermal efficiency of a gasoline engine is about ~33% Thermal efficiency of electric battery operated device charged by the power grid is less than 16%. [/quote] I think you were just making numbers up. The thermal efficiency of a gasoline-powered engine is 20%. For a battery powered engine, it is 26%. If you are going off of and hydro electric or solar grid, your efficiency is going to be boosted. I can't find a single source anywhere that backs up your numbers and monkey math.[/quote] https://www.energy.gov/sites/prod/files/2014/03/f8/deer10_johansson.pdf This has numbers and graphs, so it might be over your head. You know - monkey math. [/quote]
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