The internal combustion engine has done useful work equal to 27.6 MJ and consumed 3 liters
April 20, 2021 | education
| The internal combustion engine has done useful work equal to 27.6 MJ and consumed 3 liters of gasoline. Calculate the efficiency of the engine.
Initial data: Ap (useful work of the internal combustion engine) = 27.6 MJ = 27.6 * 10 ^ 6 J; V (volume of consumed gasoline) = 3 l = 3 dm ^ 3 = 7.5 * 10 ^ -3 m ^ 3.
Constants: ρ (gasoline density) = 710 kg / m ^ 3; q (specific heat of combustion of gasoline) = 4.6 * 10 ^ 7 J / kg.
The efficiency of an internal combustion engine is calculated by the formula: η = Ap / Q = Ap / (q * m) = Ap / (q * ρ * V).
Let’s make a calculation: η = 27.6 * 10 ^ 6 / (4.6 * 10 ^ 7 * 710 * 3 * 10 ^ -3) = 0.281 or 28.1%.
Answer: The efficiency is 28.1%.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.