A 4-m-high and 6-m-wide wall consists of a long 18-cm x 30-cm cross section of horizontal bricks (k = 0.72 W/m-K) separated by 3-cm-thickplaster layers (k = 0.22 W/m-K). There are also 2-cm-thick plaster layers on each side of the wall, and a 2-cm thick rigid foam (k = 0.026W/m-K) on the inner side of the wall. The indoor and the outdoor temperatures are 38°C and -4°C, respectively, and the convection heattransfer coefficients on the inner and the outer sides are hy = 10 W/m2-K and h2 = 20 W/m2K, respectively. Assuming one-dimensional heat%3Dtransfer and disregarding radiation, determine the rate of heat transfer through the wall (in W).FoamPlasterBrick

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Answered: A 4-m-high and 6-m-wide wall consists…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Consider a large plane wall of thickness 2L=20mm. Both surfaces of the wall are convectively cooled by the surrounding coolant at To = 250°C with a heat transfer coefficient of h= 1100 W/m².K. A fuel element of a nuclear reactor is considered in the shape of this large plane wall with given constant thermal properties as thermal conductivity k = 30 W/m.K and a = 5 x 10-6m²/s. It is known that heat is generated uniformly within the element at a volumetric rate of q = 1x 107W /m³. A departure from the steady-state conditions associated with normal operation will occur if there is a change in the generation rate. Consider a sudden change to q2 = 2 x 107W/m³. Assuming steady one-dimensional heat transfer along the wall, use the explicit finite- difference method to show how to calculate temperature To at 1.2 sec and temperature Ts at 1.5 sec. (show which equation to use and the calculations in details)
A rectangular fin with k=43 W/m.C , thickness t=2 cm , length L=14 cm and width W=1 m. The base of the fin is maintained at a temperature of 200 C while the fin is exposed to a convection environment at T∞= 15 C and h∞ = 20 W/m2 .C .Using the chart , calculate the heat lost from the fin .
Heat transfer حرارة حبي
A cylindrical cold storage facility with an inner diameter of 4m and height of 2m is constructed. For the wall, the first layer is 6 cm of glass wool (0.1 W/m-C), followed by 30 cm of concrete. The temperature inside is maintained at -10C (hin = 55 W/m^2-C) while the outside temperature is 10°C (hout = 22 w/m^2-C). If the steady rate of heat transfer is at 60W, (a) what is the thermal conductivity of concrete? (b) At what radius is the temperature at 0°C? To prevent water condensation inside the concrete wall (which damages the structure), A 5 cm layer of insulation (k = 0.15 W/m-C) is added to the exterior of the facility. (c) What is the new rate of heat transfer? (d) What is the temperature at the interface of the concrete wall and new insulation? (e) is condensation within the core of the wall prevented?
A 4-m high and 6-m-wide wall consists of long 15-cm x 20 cm cross section horizontal bricks (k of 0.69 W/m K) separated by 2-cm thick plaster layers (k of 0.2 W/m K). There are also 2-cm-thck plaster layers on each side of the brick and a 3-cm-thick rigid foam (k of 0.025 W/m K) on the inner side of the wall. See figure below. The indoor and the outdoor air temperatures are 18 and -8oC, respectively. Convective heat transfer coefficient for inside and outer surfaces are 8 and 22 W/m2 K, respectively. Assume 1-D heat transfer. Neglect radiation assume any plane wall normal to the x-direction is isothermal, draw the thermal circuit and calculate the heat transfer rate through the wall
There is a 1.20-cm-thick stagnant air pocket. A) What thickness of cork would have the same R-factor as the stagnant air pocket? The thermal conductivity of air is 0.0230 W/m·K and of cork is 0.0460 W/m·K.in cm B) What thickness of tin would be required for the same R-factor as a 1.20-cm-thick stagnant air pocket? The thermal conductivity of air is 0.0230 W/m·K and of tin is 66.8 W/m·K . in m i asked how to do this but got the wrong soloution
In the given figure, cylindrical fins of circular cross section with a rectangular profile are attached to a hollow cylindrical element. Values are given on the figure. According to thisa) The efficiency and effectiveness of the blade b) Calculate the amount of heat transfer per unit length for N=100 blades.
A 10 cm thick wall is to be constructed with 2.5 m long wood studs (k = 0.11 W/m.K), that has a cross section of 10 cm × 10 cm. At some point the builder has run out of those stud and started using pairs of 2.5 m long wood stud with cross section of 5 cm × 10 cm nailed to each other instead. The manganese steel nails (k = 50 W/m.K) are 10 cm long and have dia of 0.4 cm. A total 50 nails are used to connect the two studs. The temperature difference between inner and outer wall is 15°C. Assuming negligible thermal contact resistance between two layers. Calculate heat transfer rate (i) through a solid stud, (ii) through stud pair with equal length and width nailed to each other, (iii) also, determine the effective thermal conductivity of the nailed stud pair.
Radioactive material is stored in a spherical vessel with a diameter of 3.7 m, and the center of the vessel is 11 m below the ground. The vessel is surrounded by a 10.2 cm thick layer of rigid foam insulation (k = 0.026 W/m-K). The radioactive material releases heat at a rate of 1000 W/m³. The surface of the soil it's buried in (k = 2 W/m- K) is exposed to wind with a temperature of 20°C and a convection coefficient of 17 W/m²-K. What is the temperature of the surface of the tank?
3-52 A 4-m-high and 6-m-wide wall consists of a long 18-cm X 30-cm cross section of horizontal bricks (k = 0.72 W/m . °C) separated by 3-cm-thick plaster layers (k = 0.22 W/m . °C). There are also 2-cm-thick plaster layers on each side of the wall, and a 2-cm-thick rigid foam (k = 0.026 W/m - °C) on the inner side of the wall. The indoor and the outdoor temperatures are 22°C and −4°C, and the convec- tion heat transfer coefficients on the inner and the outer sides are h₁ = 10 W/m² . °℃ and h₂ = 20 W/m². °C, respectively. Assuming one-dimensional heat transfer and disregarding radi- ation, determine the rate of heat transfer through the wall. Foam Plaster Brick 1+₂+18 2 FIGURE P3-52 18 cm N 1.5 cm 30 cm 1.5 cm
The composite wall which is composed of 10 cm brick (k=0.40 W/m2-C), 2 cm cellotex (k=0.03 W/m2- OC), and 6 cm (k=0.30 W/m2-OC),has an outer (brick) temperature T=23 OC and an inner (plaster)temperature T=90 OC. Find the temperature between the cellotex andplaster in OC.
A 12 m long and 5 m high wall is constructed of two layers of 1 cm thick sheetrock (& = 0.17 W/m. °C) spaced 16 cm by wood studs & = 0.11 W/m °C) whose cross section is 16 cm x 5 cm. The studs are placed vertically 60 cm apart, and the space between them is filled with fiberglass insulation (* = 0.034 W/m. °C). The house is maintained at 20°C and the ambient temperature outside is -9°C. Taking the heat transfer coefficients at the inner and outer surfaces of the house to be 8.3 and 34 W/m?. °C respectively, determine (a) The thermal resistance of the wall considering a representative section of it (b) The rate of heat transfer through the wall

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