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Консультация № 200695
22.04.2021, 08:16
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Здравствуйте, уважаемые эксперты! Прошу вас помочь с решением этой задачи:
ПРАКТИЧЕСКАЯ РАБОТА № 3
Задача 11. (Тепловое излучение)
Определить тепловой поток, теряемый за счет излучения стальной трубой диаметром 80 мм и длиной l = 13 м. Труба, температура которой t1 = 270 С, расположена в помещении на большом удалении от его стен. Степень черноты материала трубы
ε1 = 0,73, температура стен в помещении t2 = 25 С.
Как изменится лучистая составляющая коэффициента теплоотдачи от поверхности трубы, если ее покрыть цилиндрическим кожухом (экраном) толщиной 20 мм, выполненным из тонких алюминиевых листов (степень черноты ε2 = 0,055)?
Найти температуру алюминиевого кожуха. Конвективным теплообменом при расчетах пренебречь.
ПРАКТИЧЕСКАЯ РАБОТА № 3
Задача 11. (Тепловое излучение)
Определить тепловой поток, теряемый за счет излучения стальной трубой диаметром 80 мм и длиной l = 13 м. Труба, температура которой t1 = 270 С, расположена в помещении на большом удалении от его стен. Степень черноты материала трубы
ε1 = 0,73, температура стен в помещении t2 = 25 С.
Как изменится лучистая составляющая коэффициента теплоотдачи от поверхности трубы, если ее покрыть цилиндрическим кожухом (экраном) толщиной 20 мм, выполненным из тонких алюминиевых листов (степень черноты ε2 = 0,055)?
Найти температуру алюминиевого кожуха. Конвективным теплообменом при расчетах пренебречь.
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