Sustainable Energy * USA - Buses are present day technologies with better energy usage than autos.
At its best, shared public transport is far more energy-efficient than individual car-driving. A diesel-powered coach, carrying 49 passengers and doing 10 miles per gallon at 65 miles per hour, uses 6 kWh per 100 p-km -13 times better than the single-person car
El Granada,Cal,USA -Less CO2 Essay, by Lee M -4 Aug 2009: -- In 1979, when I asked a Los Angeles public transit planner what they used as facts for energy efficiency, the planner said a typical 52 passenger bus got 5 miles per gallon of diesel fuel... From, MacKay's appendix, a U.S. gallon of diesel fuel computes to 40.48 kWh... The unit of transportation energy usage to be computed is kWh per 100 passenger kilometers... 40.48 kWh/ (5 miles x 1.609 km/mile x 52 passengers) = 9.68 kWh per 100 passenger km... McKay recognizes in his transportation analysis that buses and trains do not run fully loaded... In 2006–7, the total energy cost of all London’s underground trains, including lighting, lifts, depots, and workshops, was 15 kWh per 100 p-km – five times better than our baseline car. In 2006–7 the energy cost of all London buses was 32 kWh per 100 p-km. Energy cost is not the only thing that matters, of course. Passengers care about speed: and the underground trains delivered higher speeds (an average of 33 km/h) than buses (18 km/h). Managers care about financial costs: the staff costs, per passenger-km, of underground trains are less than those of buses... That is a really interesting value, his real world total energy cost of 32 kWh per 100 p-km is 5.3 times as much energy as the ideal fully loaded bus with no extraneous energy charges applied... Taking the reciprocal, the value of .19 crudely compares to a 19% "load factor". Now we are being really crude here.... but what it suggests is the London bus system probably has a working load factor of perhaps 30 or 40%...Labels: green buses
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