Useful Numbers

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Wondering where we got our numbers from?  Check out this table!

Quantity Value Approximate Range Units
SUN AND EARTH      
Sun's surface (effective) temperature 1 5778   K
Emissivity of the Sun 2 1    
Mean Surface Temperature of Earth 3 287.5 ± 0.1 annual variation K
Emissivity of Earth 2 0.95    
Solar Constant(S) 4 1366 ± 1 (fluctuation) W/m2
Mean Solar Flux Averaged Over Earth's Surface (top of atmosphere) 5 341.5   W/m2
Average albedo (A) of the Earth 6 0.296 ± 0.002 (measurement uncertainty)  
Mean Solar Flux Averaged Over Earth's Surface (bottom of atmosphere) 7 240   W/m2
Annual Human Energy Consumption on Earth (2008)8 4 x 1020   J
Mean Human Power Consumption on Earth (2008)8 1.5 x 1013   W
       
HEAT/ENERGY      
Kerosene Energy Content 9 45   MJ/kg
Energy Content of Methane (CH4) 10 55   MJ/kg

Energy Content of Long-Chain Hydrocarbons (CH2)n 10

41 ± 4 MJ/kg

Energy Content of Carbohydrates (CH2O)10

16   MJ/kg
Average Greenhouse Gas Production of Electricity Generated in BC 11 28   t C02e/GWh
  7.8   g CO2/MJ
Average Greenhouse Gas Production of Electricity Generated in Canada 12 230   t C02e/GWh
  64   g CO2/MJ
C02 Production Per Capita in Canada 13 17.4   tonnes 
C02e Production Per Capita in Canada (2005) 14 23   tonnes
       
Daily Human Energy Consumption 15 2000 ± 500 Calories
1 food calorie = 1 Cal = 1 000 cal = 1 kcal 4.2   kJ
       
 TRANSPORTATION:      
Energy Content of Diesel Oil 16 38 ±2 MJ/L
Diesel Energy Efficiency 17 37% ballpark  
Car Fuel Consumption 18 0.1 varies by at least a factor 2 L/km
Energy Content of Gasoline 19 32   MJ/L
Gasoline Engine Efficiency 20 25% ballpark  
Density of gasoline 19 740 ±30 kg/m3
GHG Production Due to Gasoline 21 2.3   kg CO2/L
Energy Content of Jet Fuel22 35 ±2 MJ/L
Drag Coefficient - Typical Family Car 23 0.3 ballpark  
Drag Coefficient - Bicycle 23 1 ballpark  
Rolling Resistance - Ordinary Car Tire 24 0.015 ballpark  
Rolling Resistance - Truck Tire 24 0.01 ballpark  
Rolling Resistance - Bike Tire 25 0.005 ballpark  
Rolling Resistance - Train Wheel 24 0.001 ballpark  
Electric Car Charging/Discharging Efficiency 26 85% ballpark  
Electric Motor Efficiency 26 85% ballpark  
Energy Consumption for Electric Cars 27 0.54 ballpark MJ/km
       

 

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