A refrigerator door of area 0.6 sq.m consists of 25 mm of insulation on top of a thin metal sheet. The film heat transfer coefficients inside and outside the refrigerator are 10.0 and 15.0 W m-2 K-1, respectively, and the thermal conductivity of the insulation is 0.25 W m-1 K-1. If the working temperature of the refrigerator is 0oC and ambient temperature is 20oC, determine the heat flow through the refrigerator door and the temperature of the inside surface of the door.

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Q: Question 2 Steam at 320ºC flows in a stainless steel pipe, whose inner and outer diameters are D₁ =…

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Q: Consider the base plate of a 1200-W household iron that has a thickness of L = 0.5 cm, base area of…

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Q: A long homogeneous resistance wire of radius r0 = 2 cm, and thermal conductivity k = 25 W/m°C is…

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Q: Steam at 320ºC flows in a stainless steel pipe, whose inner and outer diameters are D₁ = 5 cm and Do…

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Q: A refrigerator door of area 0.6 sq.m consists of 25 mm of insulation on top of a thin metal sheet.…

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Q: A sphere ( k=204 W/m K) with inner diameter 4 cm and outer diameter of 8 cm. The inside temperature…

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Q: Water (5.2 L'min) is flowing in a tube "D-3 cm, L-5 m" and is to be heated from 15°C to 59.9°C by…

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Q: Determine the rate of heat transfer and the overall heat transfer coefficient for the composite wall…

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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.