Вопрос
3. 3m^3 of air expands from 0.54 MPa and 45^circ C to 0.15 MP a in a polytropic process with an exponent of n=1.36 Find the final volume and temperature of the air.
Решения
4.2
(348 Голоса)
Борис
Экспертная проверка
мастер · Репетитор 5 лет
Ответ
To solve this problem, we can use the polytropic process equation:
where:-
is the initial pressure (0.54 MPa)-
is the initial volume (3 m³)-
is the final pressure (0.15 MPa)-
is the final volume-
is the polytropic exponent (1.36)First, we need to find the final volume
:
Substituting the given values:
Next, we need to find the final temperature
. We can use the relation for a polytropic process:
First, we need to convert the initial temperature
from Celsius to Kelvin:
Now, we can find
:
\[ T_2 = 603.57 \text} \, the final volume of the air is 14.688 m³, and the final temperature is 603.57 K.