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Консультация № 199184
16.09.2020, 20:06
0.00 руб.
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2
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Требуется ежечасно подавать 60 м3 воды на вы¬соту 18 м. Какой мощности двигатель надо подключить к насосу, если КПД насоса 75%? Принять g= 10 м/с2. Обязательно показать рисунок.
Требуется ежечасно подавать 60 м3 воды на вы¬соту 18 м. Какой мощности двигатель надо подключить к насосу, если КПД насоса 75%? Принять g= 10 м/с2. Обязательно показать рисунок.
Обсуждение
17.09.2020, 06:02
общий
Адресаты:
"Обязательно показать рисунок" - Как только покажете на этой странице рисунок воды или какого-нибудь двигателя, так я сразу решу Вашу задачу. 
21.09.2020, 17:25
общий
это ответ
Здравствуйте, dar777!
При подъёме массы m на высоту h расходуется энергия E = mgh, или (с учётом того, что объём V вещества с плотностью [$961$] имеет массу m = [$961$]V) E = [$961$]Vgh. Если на подъём затрачивается время t, то средняя мощность насоса будет равна
а мощность двигателя с учётом КПД насоса [$951$] составит
В данном случае V = 60 м[sup]3[/sup], плотность воды можно считать равной [$961$] = 1000 кг/м[sup]3[/sup], h = 18 м, t = 1 ч = 3600 с, [$951$] = 75% = 0.75 и
Вт = 4 кВт.
При подъёме массы m на высоту h расходуется энергия E = mgh, или (с учётом того, что объём V вещества с плотностью [$961$] имеет массу m = [$961$]V) E = [$961$]Vgh. Если на подъём затрачивается время t, то средняя мощность насоса будет равна
а мощность двигателя с учётом КПД насоса [$951$] составит
В данном случае V = 60 м[sup]3[/sup], плотность воды можно считать равной [$961$] = 1000 кг/м[sup]3[/sup], h = 18 м, t = 1 ч = 3600 с, [$951$] = 75% = 0.75 и
Вт = 4 кВт.
5
Это самое лучшее решение!
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