دانلود مقاله ISI انگلیسی شماره 54046
عنوان فارسی مقاله

اثر بارندگی گذرا بر روی مواجهه با دما و رطوبت کابل برق زیرزمینی

کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
54046 2015 13 صفحه PDF سفارش دهید محاسبه نشده
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
Effect of rainfall transients on thermal and moisture exposure of underground electric cables
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : International Journal of Heat and Mass Transfer, Volume 80, January 2015, Pages 660–672

کلمات کلیدی
کابل های زیرزمینی؛ انتقال حرارت کابل؛ انتقال رطوبت؛ مهندسی حرارتی؛ عایق بندی کابل برق؛ بارش باران
پیش نمایش مقاله
پیش نمایش مقاله اثر بارندگی گذرا بر روی مواجهه با دما و رطوبت کابل برق زیرزمینی

چکیده انگلیسی

Cable ampacity analysis is generally performed assuming constant worst-state environmental conditions, which often correspond to a dry soil condition or to a condition with uniform ambient soil moisture content. The characteristic time scale of thermal variation in the soil is large, on the order of several weeks, and is similar to the time scale between rainfall events in many geographic locations. Intermittent rainfall events introduce significant transient fluctuations that influence the thermal conditions and moisture content around a buried cable both by increasing thermal conductivity of the soil and by increasing the moisture exposure of the cable insulation. This paper reports on a computational study of the effect of rainfall events on the thermal and moisture transients surrounding a buried cable. The computations were performed with a finite-difference method using an overset grid approach, with an inner polar grid surrounding the cable and an outer Cartesian grid. The thermal and moisture transients observed in computations with periodic rainfall events were compared to control computations with a steady uniform rainfall. Under periodic rainfall conditions, the temperature and moisture fields are observed to approach a limit-cycle condition in which the cable surface temperature and moisture content oscillate in time, but with mean values that are significantly different than the steady-state values.

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