集、輸油管道沿程溫降計(jì)算公式
(1) (2) (3) 式中: t1— 管道起點(diǎn)溫度,℃; t2— 管道終點(diǎn)溫度,℃; t0— 管道周圍介質(zhì)溫度,℃; D— 管道外徑,m; qm— 管內(nèi)介質(zhì)流量,kg/h; c— 介質(zhì)比熱容,koal/kg.℃; L—計(jì)算管段起、終點(diǎn)距離,m; K—管內(nèi)介質(zhì)至周圍介質(zhì)的總傳熱系數(shù),kcal/m2.h.℃; a—計(jì)算常數(shù)。 |
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