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Консультация № 175185
13.12.2009, 08:25
35.00 руб.
0
1
1
Доброго времени суток господа эксперты,необходима ваша помощь:
1)Дана смесь газов, состоящая из неона, масса которого M1=4 кг, и водорода, масса которого M2=1 кг. Определить удельные теплоемкости сv и сp смеси.
2)1 кг воздуха, находящегося при температуре 30 0С и давлении 1,5 атм, расширяется адиабатически и давление при этом падает до 1 атм. Найти: 1) конечную температуру; 2) работу, совершенную газом при расширении
3)Определить КПД цикла, состоящего из двух адиабат и двух изохор, совершаемого идеальным газом, если известно, что в процессе адиабатного расширения абсолютная температура газа Т2=0,75Т1, а в процессе адиабатного сжатия Т3=0,75Т4.
1)Дана смесь газов, состоящая из неона, масса которого M1=4 кг, и водорода, масса которого M2=1 кг. Определить удельные теплоемкости сv и сp смеси.
2)1 кг воздуха, находящегося при температуре 30 0С и давлении 1,5 атм, расширяется адиабатически и давление при этом падает до 1 атм. Найти: 1) конечную температуру; 2) работу, совершенную газом при расширении
3)Определить КПД цикла, состоящего из двух адиабат и двух изохор, совершаемого идеальным газом, если известно, что в процессе адиабатного расширения абсолютная температура газа Т2=0,75Т1, а в процессе адиабатного сжатия Т3=0,75Т4.
Обсуждение
17.12.2009, 00:38
общий
это ответ
Здравствуйте, max123.
Дано:
1) Ne
i=3 (одноатомный газ)
М1=20*10-3 кг/моль
m1=4 кг
2) Н2
i=5 (двухатомный газ)
M2=2*10-3 кг/моль
m2=1 кг
Найти:
cp; cV
Решение:
Сначала для неона
Показатель адиабаты (и почему у меня нет этой кнопки "гамма"?
) Y=(i+2)/i = (3+2)/3=1.67
Y=cp/cV
сV1=i/2 * R/M1 = 3/2 * 8.31/20*10-3 = 623.25 Дж/кг*К
Тогда
cp1= Y*cV1=1.67*623.25=1040.83 дж/кг*К
Аналогичные расчеты для водорода дают
Y=1.4
cV2=10387.5 Дж/кг*К
сp2=14958 Дж/кг*К
Из уравнения теплового баланса
cV1*m1*[$916$]t + cV2*m2*[$916$]t = cV*(m1+m2)*[$916$]t
Получаем
cV=(cV1*m1+cV2*m2)/(m1+m2) = 2576.1 Дж/кг*К
Абсолютно аналогичный вывод дает формулу для сp
cp=(cp1*m1+cp2*m2)/(m1+m2) = 3824.3 Дж/кг*К
Удачи
Дано:
1) Ne
i=3 (одноатомный газ)
М1=20*10-3 кг/моль
m1=4 кг
2) Н2
i=5 (двухатомный газ)
M2=2*10-3 кг/моль
m2=1 кг
Найти:
cp; cV
Решение:
Сначала для неона
Показатель адиабаты (и почему у меня нет этой кнопки "гамма"?
) Y=(i+2)/i = (3+2)/3=1.67Y=cp/cV
сV1=i/2 * R/M1 = 3/2 * 8.31/20*10-3 = 623.25 Дж/кг*К
Тогда
cp1= Y*cV1=1.67*623.25=1040.83 дж/кг*К
Аналогичные расчеты для водорода дают
Y=1.4
cV2=10387.5 Дж/кг*К
сp2=14958 Дж/кг*К
Из уравнения теплового баланса
cV1*m1*[$916$]t + cV2*m2*[$916$]t = cV*(m1+m2)*[$916$]t
Получаем
cV=(cV1*m1+cV2*m2)/(m1+m2) = 2576.1 Дж/кг*К
Абсолютно аналогичный вывод дает формулу для сp
cp=(cp1*m1+cp2*m2)/(m1+m2) = 3824.3 Дж/кг*К
Удачи
Об авторе:
С уважением
shvetski
С уважением
shvetski
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