Q3. What is the analogical reason between heat transfer by conduction and flow of electricity through ohmic resistance? Use a composite wall of a building to illustrate the concept. A composite slab with three layers of thermal conductivities k1, k2, k3 and thickness t1, t2, t3 respectively, are placed in a close contact. Derive an expression from the first principle for the heat flow through the composite slab per unit surface area in terms of the overall temperature difference across the slab.

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Q: 3.13 Consider a composite wall of overall height H = 20 mm and thickness L = 30 mm. Section A has…

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Q: derive an expression for the thermal conductivity k(x) for these conditions

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A: Given:ρ=3200 Kg/m3V=0.003 m3As=0.07 m2k=300 W/m.KC=500 J/Kg.KTb-T∞=100°CT-T∞=13*100°Ch=60 W/mK

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Q: 3.13 A house has a composite wall of wood, fiberglass insula- tion, and plaster board, as indicated…

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Q: The composite wall of an oven consists of three materials, two of which are of known thermal…

A: Given:kA=25 W/m.KkC=60W/m.KLA=0.40 mLB=0.20 mLC=0.20 mTs,o=20oCTs,i=600oCT∞=800oCh=25 W/m2.KFind:The…

Q: What is the analogical reason between heat transfer by conduction and flow of electricity through…

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Q: • 1. A wall 2 cm thick is to be constructed from material that has an average thermal conductivity…

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.