RE: Peak Petrol
September 10, 2023 at 2:30 pm
(This post was last modified: September 10, 2023 at 2:40 pm by Anomalocaris.)
(September 10, 2023 at 1:53 pm)Deesse23 Wrote:(September 10, 2023 at 1:15 pm)Anomalocaris Wrote: From the perspective of CO2 emission, Burning coal to generate electricity to power EV is worse then burning gasoline in internal combustion engined cars by about 10-20%Please provide your calculation/estimation.
coal emits roughly 220 lbs of CO2 per MMBTU, motor grade gasoline emits about 150 lbs per MMBTU. typical modern coal plants are about 40% thermal efficiency at bus bar, which means roughly 550 lbs of CO2 per MMBTU equivalent of energy delivered to the grid. Typical road legal car drive train are about 30% thermal efficient, which means about 450 lbs of CO2 per MMBTU equivalent of kenetic energy delivered to the wheel.
This is without considering transmission, distribution and battery charging loss, which amounts to more than 15%
The advantage reverses if the electricity used to power EV is generated by natural gas, which emits half as much CO2 per unit of thermal energy as coal, and gas burning combined gas and steam cycle turbine are thermally much more efficient than coal burning boiler abs steam turbine. But china does not have abundant natural gas and natural gas does not account for significant portion of chinese generation portfolio as it does in the U.S., and abundant Russian natural gas cut off from Europe can not avail china because pipeline infrastructure does not exist.