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Консультация № 191709
09.11.2017, 14:08
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Окно с двойным остеклением состоит из рамы, в которую вставлены два стекла, разделенные воздушной прослойкой. Покажите, что скорость теплового потока благодаря теплопроводности дается следующей формулой
ΔQ/Δt=S(T2-T1)/(h1/k1+h2/k2+h3/k3), где k1,k2,k3 - коэффицент теплопроводности стекла, воздуха и снова стекла, h1,h2,h3 - их толщины.
(книга Джанколини "Физика" задача 37 раздел 19.7-19-9)
Окно с двойным остеклением состоит из рамы, в которую вставлены два стекла, разделенные воздушной прослойкой. Покажите, что скорость теплового потока благодаря теплопроводности дается следующей формулой
ΔQ/Δt=S(T2-T1)/(h1/k1+h2/k2+h3/k3), где k1,k2,k3 - коэффицент теплопроводности стекла, воздуха и снова стекла, h1,h2,h3 - их толщины.
(книга Джанколини "Физика" задача 37 раздел 19.7-19-9)
Обсуждение
19.11.2017, 07:19
общий
это ответ
Здравствуйте, vera_cat2017!
Согласно формуле 19.2а из указанного Вами учебника, при стационарном режиме имеем
-- тепловой поток, проходящий через поперечное сечение первого слоя (стекла) за промежуток времени, --
-- тепловой поток, проходящий через поперечное сечение второго слоя (воздуха) за промежуток времени, --
-- тепловой поток, проходящий через поперечное сечение третьего слоя (стекла) за промежуток времени, --
Отсюда получим
Согласно формуле 19.2а из указанного Вами учебника, при стационарном режиме имеем
-- тепловой поток, проходящий через поперечное сечение первого слоя (стекла) за промежуток времени, --
-- тепловой поток, проходящий через поперечное сечение второго слоя (воздуха) за промежуток времени, --
-- тепловой поток, проходящий через поперечное сечение третьего слоя (стекла) за промежуток времени, --
Отсюда получим
Об авторе:
Facta loquuntur.
Facta loquuntur.
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