Question

під час роботи теплового двигуна використано 2 кг дизельного палива. при цьому двигун виконав корисну роботу 28 МДж. обчисліть ККД теплового двигуна.​

Answer 1

Ответ:

ККД=A/Q*100%

A=7000000 Дж

m=0.5 kg

q=42000000 Дж/кг

Q=q*m=21000000 Дж

KKД=(7000000/21000000)*100%=0.33*100%=33%

Answer 2

Calculation of Thermal Efficiency (ККД) of a Heat Engine

To calculate the thermal efficiency (ККД) of a heat engine, we need to use the formula:

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

In this case, we are given that the heat engine used 2 kg of diesel fuel and performed useful work of 28 MJ.

Let's calculate the thermal efficiency:

Step 1: Convert the useful work output from MJ to J:

28 MJ = 28,000,000 J

Step 2: Calculate the heat input:

The heat input can be calculated by multiplying the mass of the fuel by its calorific value. Unfortunately, the calorific value of