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Консультация № 180990
28.11.2010, 10:40
0.00 руб.
0
4
1
Здравствуйте, уважаемые эксперты! Прошу Вас ответить на следующий вопрос:
Вода выходит из водяной рубашки двигателя внутреннего сгорания нагретой до 90 [$186$]С, после чего поступает в радиатор, где охлаждается до 40[$186$]С и снова возвращается обратно. Какое количество тепла уносится водой от двигателя ежеминутно, если производительность насоса, движущего воду, равна 30 л/мин?
Вода выходит из водяной рубашки двигателя внутреннего сгорания нагретой до 90 [$186$]С, после чего поступает в радиатор, где охлаждается до 40[$186$]С и снова возвращается обратно. Какое количество тепла уносится водой от двигателя ежеминутно, если производительность насоса, движущего воду, равна 30 л/мин?
Обсуждение
Неизвестный
28.11.2010, 12:06
общий
Удельная теплоемкость воды с=4200 Дж/(кг*К).
Масса 1 литра 1кг.
Q=m*c*(T2-T1)= 1 кг * 4200 Дж/(кт*К) * ( 90 - 40 ) К = 210000 Дж.
Масса 1 литра 1кг.
Q=m*c*(T2-T1)= 1 кг * 4200 Дж/(кт*К) * ( 90 - 40 ) К = 210000 Дж.
Неизвестный
28.11.2010, 13:02
общий
или по другому:
G=30 л/мин = 1,8 куб/час
Q=1.8*(90-40)/1000=0.09 Гкал/час
G=30 л/мин = 1,8 куб/час
Q=1.8*(90-40)/1000=0.09 Гкал/час
29.11.2010, 10:39
общий
это ответ
Здравствуйте, Александр!
Дано: c = 4,19 • 103 Дж/(кг • К), T1 = 90 ºC = 363 К, T2 = 50 ºC = 313 К, П = 30 л/мин = 30 • 10-3 м3/мин = 0,5 • 10-3 м3/c,
ρ = 1000 кг/м3, t = 1 мин = 60 с.
Определить: Qt.
Решение.
За время t насос перекачивает массу воды, равную m = ρПt. Следовательно, водой за это время уносится количество теплоты, равное
Qt = cm(T1 – T2) = cρПt(T1 – T2) = 4,19 • 103 • 1000 • 0,5 • 10-3 • 60 • (363 – 313) ≈ 6,3 • 106 (Дж) = 6,3 МДж.
Ответ: 6,3 МДж.
С уважением.
Дано: c = 4,19 • 103 Дж/(кг • К), T1 = 90 ºC = 363 К, T2 = 50 ºC = 313 К, П = 30 л/мин = 30 • 10-3 м3/мин = 0,5 • 10-3 м3/c,
ρ = 1000 кг/м3, t = 1 мин = 60 с.
Определить: Qt.
Решение.
За время t насос перекачивает массу воды, равную m = ρПt. Следовательно, водой за это время уносится количество теплоты, равное
Qt = cm(T1 – T2) = cρПt(T1 – T2) = 4,19 • 103 • 1000 • 0,5 • 10-3 • 60 • (363 – 313) ≈ 6,3 • 106 (Дж) = 6,3 МДж.
Ответ: 6,3 МДж.
С уважением.
5
Большое спасибо!!!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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