כמה פחמן דו-חמצני (CO2) נפלט משריפת ליטר אחד בנזין

נשלח 19 ביולי 2016, 13:38 על ידי Sustainability Org   [ עודכן 21 ביולי 2016, 23:05 ]

על פי המידע המופיע בהמשך, מארה"ב, בוצע חישוב של משקל הפחמן הדו-חמצני (CO2) שנפלט משריפת ליטר אחד בנזין.
המרת מידות ארה"ב למידות ישראל:
1 גלון = 3.8 ליטר
1 פאונד = 0.45 ק"ג

19.64 פאונד של CO2 נפלטים משריפת גלון בנזין.
1 גלון = 3.8 ליטר
מליטר בנזין נפלטים 5.16 פאונד CO2
החישוב:  19.64/3.8 
5.16 פאונד CO2 הם 2.32 ק"ג CO2
חישוב: 5.16*0.45
מליטר בנזין נפלטים 2.32 ק"ג CO2.


How much carbon dioxide is produced by burning gasoline and diesel fuel?

About 19.64 pounds of carbon dioxide (CO2) are produced from burning a gallon of gasoline that does not contain ethanol. About 22.38 pounds of CO2 are produced from burning a gallon of diesel fuel.

EIA estimates1 that U.S. motor gasoline and diesel (distillate) fuel consumption for transportation in 2015 resulted in the emission of about 1,105 million metric tons of CO2 and 440 million metric tons of CO2, respectively, for a total of 1,545 million metric tons of CO2. This total was equivalent to 83% of total U.S. transportation sector CO2 emissions and equivalent to 29% of total U.S. energy-related CO2 emissions in 2015.

Under international agreement, CO2 emissions from the combustion of biomass or biofuels are not included in national greenhouse gas emissions inventories.2 Most of the retail gasoline now sold in the United States contains about 10% fuel ethanol (or E10) by volume. Burning a gallon of E10 produces about 17.68 pounds of CO2 that is emitted from the fossil fuel content. If the CO2 emissions from ethanol combustion are considered, then about 18.95 pounds of CO2 are produced when a gallon of E10 is combusted. About 12.73 pounds of CO2 are produced when a gallon of pure ethanol is combusted.

Biodiesel fuel can be purchased in many states. Biodiesel fuel is sold with various amounts of biodiesel content. B20 is a commonly sold biodiesel fuel. B20 contains 20% biodiesel and 80% petroleum diesel fuel.  Burning a gallon of B20 results in the emission of about 17.90 pounds of CO2 that is emitted from the fossil fuel content. If the emissions from burning the biodiesel in B20 are included, then about 22.06 pounds of CO2 are produced. About 20.77 pounds of CO2 are produced from burning a gallon of B100 (100% biodiesel).

1 As of April 26, 2016; preliminary estimates.
2  Environment (Section note), Monthly Energy Review.

Learn more:
Carbon dioxide emission factors for transportation fuels
Historical U.S. energy-related CO2 emissions by source (fuel type) and sector
Historical data on U.S. ethanol and biodiesel production and consumption (Tables 10.3 and 10.4)
Metric conversion factors

Last updated: May 6, 2016

Source: eia.gov

Greenhouse Gas Emissions from a Typical Passenger Vehicle

Office of Transportation and Air Quality
EPA-420-F-14-040a
May 2014
Greenhouse Gas Emissions from a Typical Passenger Vehicle The U.S. Environmental Protection Agency (EPA) developed this fact sheet to answer common questions about greenhouse gas emissions from passenger vehicles. This fact sheet provides emission rates and calculations consistent with EPA’s regulatory work.
How much tailpipe carbon dioxide (CO2) is created from burning one gallon of fuel?
The amount of CO2 created from burning one gallon of fuel depends on the amount of carbon in the fuel. Typically, more than 99% of the carbon in a fuel is emitted as CO2 when the fuel is burned. Very small amounts are emitted as hydrocarbons and carbon monoxide, which are converted to CO2 relatively quickly in the atmosphere. Carbon content varies by fuel, and some variation within each type of fuel is normal. The EPA and other agencies use the following average carbon content values to estimate CO2 emissions:
CO2 Emissions from a gallon of gasoline: 8,887 grams CO2/gallon

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