How many kilowatt-hours of electricity does a new energy vehicle consume per 100 kilometers?
1 Answers
New energy vehicles consume approximately 17 kWh per 100 kilometers. Introduction to the power consumption of pure electric vehicles: Assuming an ordinary fuel-powered car and an electric vehicle travel the same distance, the energy required is the same, similar to moving an object where the work done by human power and by a machine is identical. Calculation method: The fuel consumption of a typical household car is around 8 liters per 100 kilometers, and the density of gasoline is approximately 0.72 kilograms per liter, which translates to 5.76 kilograms per 100 kilometers. The energy content of gasoline is 43.1 megajoules per kilogram, so the energy required for a car to travel 100 kilometers is calculated to be 248 megajoules. Most of the energy from gasoline combustion is carried away by exhaust gases, and additional energy is lost during transmission from the engine to the wheels. Therefore, generally, only 15%-25% of the energy contained in gasoline is effectively used for the car's movement, with a median value of 20%. This means approximately 50 megajoules of energy is needed to propel a car for 100 kilometers. Research indicates that the cycle efficiency of an electric vehicle's battery is around 90%, and the efficiency of the motor driving the car is also about 90%. Thus, the electricity consumption per 100 kilometers for an electric vehicle is calculated as 50 megajoules ÷ 90% ÷ 90% = 61.7 megajoules. Since 1 kWh = 3.6 megajoules, the electricity consumption per 100 kilometers can be calculated as 61.7 / 3.6 = 17.1 kWh, meaning an electric car consumes about 17 kWh per 100 kilometers.
