A roof has 2 types of insulating material placed inside it. The materials are 10 cm insulating foam (0.02 W/m-K), and another unknown material that is also 10 cm. The insulating foam that is near the exterior roofing material has a temperature of 50C. The temperature measured at the area between the two layers is 42C. What is the overall heat transfer coefficient per sq. m if the interior temperature is 26C?

Q: Heat is generated in a 2.0-cm-square copper rod at the rate of 30 MW/m³. The rod is exposed to a…

A: Given data: a=2.0 cmQ˙=30 MW/m3T∞=25°Ch=5 kW/m2 Need to determine the surface temperature of the…

Q: 7. A 5-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k =15 W/m - °C) is…

A: The area of sphere at inner and outer surface is - Ai=4πri2=4π×2.52=78.54 m2,…

Q: Q5: The piston cylinder device (radius=10 cm) contains a liquid with a pressure 100 kpa and…

A: Given, for a liquid container,Pressure, P1=100KPaTemperature, T1=20°CRadius of the container,…

Q: Consider a large plate as given in the figure below. The thermal conductivity and thickness of the…

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Q: Q2) A plate having a thickness of 4.0 mm has an internal heat generation of 100MW/m³ and a thermal…

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Q: 2. A glass window and a thickness has an area of 5.5 ft² of 5 mm. If one side is at a temperature of…

A: The area of window is The thickness of the window is The temperature of one side of window is The…

Q: has an area of 5.5 ft² of 5 mm. If one side is at a temperature of 45° F and the other is at 23° F,…

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Q: ) What is the ratio of the heat lost from the unit area of the skin on the calm day to the windy…

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Q: In a solid sphere of 0.2 m diameter, heat is generated at the rate of 1.2 x 106 W/m3. The center…

A: It is assumed in the above question that the heat is transferred from the outer surface of the…

Q: 5- A wall is constructed of a section of stainless steel (k of plastic on both sides of the steel.…

A: Given data as per question For stainless steel k=1.6 W/m°C, thickness=4 mm=4×10-3 m Overall heat…

Q: 2-81 An aluminum fin 1.6 mm thick surrounds a tube 2.5 cm in diameter. The length of the fin is 12.5…

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Q: The ratio of heat flow Q/Q2 from two walls of having same thickness their thermal conductivities as…

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Q: Copper plate (k=270 w/m k) maintained at 70C in one side and another side at 30 C what is the heat…

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Q: Q1 The inner and outer surfaces a spherical shell with radii of 1 cm and 2 cm are 300°C and 100°C,…

A: We have to find heat transfer through the shell

Q: A composite wall layer consists of layer A covered by layer B. The thermal resistance of layer A is…

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Q: I have a 2m diameter rod that is 15m long. I will be putting it underground by 3 meters. The rod has…

A: Given data: ◆ The diameter of the rod: D = 2 m ◆ The length of the rod: L = 15 m ◆ The underground…

Q: A large plate of 0.5 m thickness and constant thermal conductivity of k=60 W/m-K in which heat is…

A: Given Data Thickness of plate is : L=0.5 m Thermal conductivity constant is : k=60 W/m·K Heat…

Q: The walls of a house consists of L=0.02 m thick plywood backed by insulation with the same…

A: thickness of the plywood and insulation is given =0.02m thermal conductivity of the plywood, k1=0.09…

Q: A cylindrical storage tank with diameter of 4m and a length of 10 m will hold a fluid whose…

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Q: See the composite wall in the image below. The width and height of the wall are both 0.12 meters.…

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Q: A long, thin copper rod 5 mm in diameter is exposed to an environment at 20°C. The base temperature…

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Q: Temperature distribution of a wall is given as T(x) = -100x + 50 and the cold surface is exposed to…

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Q: A very thin electrical strip providing heat flux of 909 W/m2 is attached to the plate as shown in…

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Q: A 90-amp electric current is flowing through a 6-mm diameter lead wire. The thermal conductivity of…

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Q: A box full of electronics with the dimensions shown in the diagram is buried deep in soil. The…

A: Heat transfer, in general, defines the movement of heat (thermal energy) caused by temperature…

Q: An industrial wall is constructed of 20 cm thick fireclay of thermal conductivity 1W/m 0C. This is…

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Q: There is a 1.20-cm-thick stagnant air pocket. A) What thickness of cork would have the same…

A: Given data, (1) Stagnate air pocket t1 = 1.2 cm  K1 = 0.023 W/m.k Cork K2 = 0.046 W/m.k t2 =…

Q: 4. A wall of thickness 10cm conducts heat at rate of 30W/m² when the temperature difference across…

A: Given,  Wall thickness = Δx = 10 cm = 0.1 m Heat rate (flux) = q' = 30 W/m2 Temperature difference…

Q: A wall thickness is 0.05. If the temperature of the inner surface is 40°C and the outer surface is…

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Q: Q2: A 2.5 -mm-diameter electrical wire is insulated by a 2-mm-thick rubberized sheath (k = 0.11 W/m…

A: In-plane slab, the addition of insulation always reduced the heat loss. But in the case of cylinder…

Q: The compartment below is used as a freezer of refrigerator compartment. Inner wall is at -8 C and…

A: Option C is correct K=0.097 w/mk

Q: The wall of a house is 7m wide and 6m high and is made from 0.3 m thick brick with a coefficient of…

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Q: The ears of a rabbit can be thought of as two rectangular fins that dissipate heat. The dimensions…

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Q: Question 4 The window of a room is made of 5 mm thick glass which has a thermal conductivity of 1.4…

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Q: Consider a 40 mmx40 mm x 2 mm thick heat spreader with thermal conductivity of 160 W/m-°C. If the…

A: Given: The dimension of the heat spreader is 40 mm×40 mm×2 mm. The thermal conductivity of heat…

Q: How much heat is lost due to heat convection in a 25 minute period from 50*10ft wall. If the…

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Q: There is a 1.20-cm-thick stagnant air pocket. A) What thickness of cork would have the same…

A: Given data: ◆ The thermal conductivity and thickness of stagnant air-pocket: Lair = 1.20 cm = 0.012…

Q: A very long fin ( k= 372 W/m .o C ) 2.5 cm diameter has one end maintained at 90 oC . The rod is…

A: As given fin is of infinite length so heat transfer is given as Q=kmθ0Ac Where k is thermal…

Q: . A glass window and a thickness has an area of 5.5 ft² of 5 mm. If one side is at a temperature of…

A:

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.