Question

ОЧЕНЬ СРОЧНО, 38 БАЛЛОВ В процессе работы тепловой машины за некоторое время рабочее тело получило от нагревателя 8,38 кДж теплоты и 80% тепла передало холодильнику. Определить КПД машины

Answer 1

КПД=(Qн-Qx)/Qн
Qx=0,8Qн

КПД=Qн(1-0,8)/Qн=0,2=20%
Ответ 20%

Answer 2

Calculation of Efficiency (КПД) of the Heat Engine

To determine the efficiency (КПД) of the heat engine, we need to use the formula:

Efficiency (КПД) = (Useful Work Output) / (Heat Input)

In this case, the useful work output is the amount of heat transferred to the refrigerator, and the heat input is the total heat received by the working substance.

Given information: - Heat transferred to the working substance (Q) = 8.38 kJ - Heat transferred to the refrigerator (Q_refrigerator) = 80% of the total heat received by the working substance

To calculate the heat input, we can use the equation:

Heat Input = Heat transferred to the working substance / (1 - Q_refrigerator)

Let's calculate the heat input first:

Heat Input = 8.38 kJ / (1 - 0.80)

Now, we can calculate the efficiency (КПД) using the formula mentioned earlier:

Efficiency (КПД) = (Heat transferred to the refrigerator) / (Heat Input)

Let's plug in the values and calculate the efficiency (КПД) of the heat engine.