A copper pipe that carries refrigerant at - 20 ° C has an outer diameter of 10 mm and is exposed to air at 25 ° C whose coefficient of heat transfer by air convection is h = 50 W/ (m ^2 • K) . It is proposed to apply insulation with a conductivity of < = 0.5 W/(m • K). Determine the thickness beyond which heat transfer to the pipe will be reduced. Calculate the heat transfer for insulation chicknesses of 2.5, 5 and 7.5 mm, for this consider a section of pipe 1 m long.

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Q: The wall of a 5 m high cylinderical steel tank (ks= 20 W/mK) of inner diameter 1.5 m and 200 mm…

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Q: An Aluminum rod, k=206W/(m.°K), 5cm in diameter and 15cm in length, protrudes from a wall which is…

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Q: An insulation (kins = 0.14 W/(m K) ) layer that is 0.002m thick surrounds a wire (diameter=0.0025m)…

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Q: A container has a 4 mm thick metal wall and is lined insider with a 1.5 mm-thick plastic. The inside…

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Q: Estimate the unit thermal resistance for a vertical 1.5 in. (40 mm) air space. The air space is near…

A: Write the given data. Type of air space-1.5 in (40 mm) verticalT0=10 °F (-12 °C)

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.