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Most urban homes had a coal bin and a coal-fired furnace. Over the years these were replaced with oil furnaces that were easier and safer to operate. [16] From the early 1940s, the US government and the oil industry entered into a mutually beneficial collaboration to control global oil resources. [17] By 1950, oil consumption exceeded that of coal.
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According to the U.S. Department of Energy (DOE), as a rule of thumb, each 5 mph (8.0 km/h) one drives over 60 mph (97 km/h) is similar to paying an additional $0.30 per gallon for gas. [3] The exact speed at which a vehicle achieves its highest efficiency varies based on the vehicle's drag coefficient , frontal area, surrounding air speed, and ...
So, for a boiler that produces 210 kW (or 700,000 BTU/h) output for each 300 kW (or 1,000,000 BTU/h) heat-equivalent input, its thermal efficiency is 210/300 = 0.70, or 70%. This means that 30% of the energy is lost to the environment. An electric resistance heater has a thermal efficiency close to 100%. [8]
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