工程熱力學和傳熱學(雙語)第9章習題課(編輯修改稿)
2024-11-15 16:53 本頁面
【文章內容簡介】 outside surface is 50W/(). Determine the temp of the inner and outer surface of the glass. 12. A steel tube[λ=15W/(m.℃ )] of outside diameter and thickness is covered with an insulation material [λ=(m.℃ )] of thickness 2cm. A hot gas at 320℃ with a heat transfer coefficient of 200W/() flows inside the tube. The outer surface of the insulation is exposed to cooler air at 20℃ with a heat transfer coefficient of 50W/() 。 Calculate (1) the heat loss from the tube to the air for a 5m length of the tube. (2) the temp drops due to the thermal resistances of the hot gas flow, the steel tube, the insulation layer, and the outside air. Tutorial Onedimensional steady state heatconduction 13. A Steam pipe with an outside radius of 4cm is covered with a layer of asbestos insulation [λ=(m.℃ ) ] 1cm thick, which is in turn covered with fiberglass insulation [λ=(m.℃ ) ] 3cm thick. The outside surface of the steam pipe is at a temp of 330℃ , and the outside surface of the fiberglass insulation is at 30℃ . Determine the heat transfer rate per meter length of the pipe and the interface temp between the asbestos and the fiberglass insulation. Tutorial Onedimensional steady state heatconduction Tutorial OneDimensional Unsteady State Conduction Problem 14. A steel plate [a= 105m2/s,λ=43W/(m.℃
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