Question

Під час роботи теплового двигуна використано 1,5 кг дизельного палива. При цьому двигун виконав корисну роботу, що дорівнює 21 МДж. Обчисліть ККД двигуна.​

Answer 1

Ответ: 30%

Объяснение:

Дано:

m=1,5кг

А=21МДж

q=46МДж/кг

============

η-?

η=Ап/Аз=21/(46*1,5)=0,3*100%=30%

Answer 2

Calculation of Engine Efficiency (ККД)

To calculate the efficiency of the engine, we can use the formula:

Efficiency (ККД) = (Useful Work Output / Fuel Input) x 100%

Given: - Fuel Input = 1.5 kg of diesel fuel - Useful Work Output = 21 MJ

Let's substitute these values into the formula:

Efficiency (ККД) = (21 MJ / 1.5 kg) x 100%

To perform the calculation, we need to convert the units of fuel input to match the units of useful work output. Since 1 MJ is equal to 1 million joules, we can convert the fuel input from kilograms to joules:

Fuel Input = 1.5 kg x 42.8 MJ/kg = 64.2 MJ

Now we can substitute the converted values into the formula:

Efficiency (ККД) = (21 MJ / 64.2 MJ) x 100%

Simplifying the equation:

Efficiency (ККД) = 0.327 x 100%

Therefore, the efficiency of the engine is approximately 32.7%.