Question

In: Other

A furnace wall is constructed of an inner layer of 10 mm of material A with...

A furnace wall is constructed of an inner layer of 10 mm of material A with kA = 20W/mK, 20 mm of material B with kB = 1.5 W/mK, a middle layer of 30 mm of material C with kC=3.0 W/mK) , and an outer layer of 40 mm of material D (kD=300 W/mK) . The temperature of inside wall is 1000 K and the temperature of outer layer is 350 K. The temperature and convection coefficient of hot air inside furnace are 1100 K and 100 W/m2K, while the temperature and convection heat transfer coefficient of the ambient air outside the furnace are 300K and 25 W/m2K.

1) Calculate the heat flux transferred from the furnace through the wall to surrounding.

2)Calculate the temperature at the interface between material B and material C

3) If material B is changed to material E with kE= 15W/mK with a thickness of 15mm.Calculate the heat loss from furnace to surrounding. Comment on the effectiveness of material B and material E.

Solutions

Expert Solution


Related Solutions

A flat furnace wall is constructed of a 4.5 in (114 mm) layer of Silo-cel brick,...
A flat furnace wall is constructed of a 4.5 in (114 mm) layer of Silo-cel brick, with a thermal conductivity of 0.08 Btu/ft·h·˚F (0.138 W/m·˚C), backed by a 9-in. (229-mm) layer of common brick, of conductivity 0.8 Btu/ft·h·˚F(1.38 W/m.˚C). The temperature of the inner face of the wall is 1400˚F (760˚C), and that of the outer face is 170˚F(76.6˚C). (a) What is the heat loss through the wall? (b) What is the temperature of the interface between the refractory brick...
The composite wall of a building consists of a 100 mm layer of common brick, a...
The composite wall of a building consists of a 100 mm layer of common brick, a 100 mm layer of glass fibre (organic bonded), a 10 mm layer of gypsum plaster (perlite aggregate) and a 6 mm of pine panel. If the inside convection coefficient is 10 W/m2 .K and the outside convection coefficient is 70 W/m2 .K, calculate: (i) the total thermal resistance of the wall; (ii) the overall heat transfer coefficient of the wall.
Required information A nozzle of inner radius 1.08 mm is connected to a hose of inner...
Required information A nozzle of inner radius 1.08 mm is connected to a hose of inner radius 9.20 mm. The nozzle shoots out water moving at 25.0 m/s. At what speed is the water in the hose moving? cm/s Required information A nozzle of inner radius 1.08 mm is connected to a hose of inner radius 9.20 mm. The nozzle shoots out water moving at 25.0 m/s. What is the mass flow rate? g/s Required information The volume flow rate...
A 5.0 mL syringe has an inner diameter of 5.5 mm , a needle inner diameter...
A 5.0 mL syringe has an inner diameter of 5.5 mm , a needle inner diameter of 0.22 mm , and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100. Assume the liquid is an ideal fluid. Part A What is the minimum force the nurse needs to apply to the syringe? Part B The nurse empties the syringe in 4.9...
A 4.5 mL syringe has an inner diameter of 6.0 mm , a needle inner diameter...
A 4.5 mL syringe has an inner diameter of 6.0 mm , a needle inner diameter of 0.29 mm , and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100. Assume the liquid is an ideal fluid. A. What is the minimum force the nurse needs to apply to the syringe? B. The nurse empties the syringe in 5.0 s ....
A disk with outer radius ro = 150 mm and inner radius ri = 25 mm...
A disk with outer radius ro = 150 mm and inner radius ri = 25 mm is press-fitted onto a shaft of radius 25.075 mm. Both members are steel with Young’s modulus, E = 205 GPa, Poisson’s ratio, ? = 0.29, and density, ? = 7845 kg·m-3. Determine and plot the radial and tangential stress distributions in the disk and shaft when it is rotating at 5000 rpm. Under the above conditions, what is the magnitude of the Von Mises...
A wall footing is to support a 400 mm wide reinforced concrete wall with a dead...
A wall footing is to support a 400 mm wide reinforced concrete wall with a dead load of 270 KN/m and a live load of 210 KN/m. The bottom of the footing is 1.50 m below the final grade. Assume the soil weighs 15.78 KN/m3 and the allowable soil pressure is 190 Kpa. Use 75 mm as concrete cover, fc’ is 28 Mpa, fy is 415 Mpa, and concrete weights 23.5 KN/m3. Compute the: Width and depth of footing Spacing...
The walls of an industrial freezer are constructed from a composite of three materials, an inner...
The walls of an industrial freezer are constructed from a composite of three materials, an inner layer of plastic, a layer of insulation material, and an outer layer of stainless steel. Heat transfer occurs into the interior of the freezer from the external atmosphere. a) Provide a sketch to illustrate the variation in temperature from the interior of the freezer compartment to the outer ambient air. In your sketch clearly identify the individual thermal resistances and identify the mode of...
The wall of a house is made from a layer of wood 3cm thick and a...
The wall of a house is made from a layer of wood 3cm thick and a layer of wool which is 5.3 cm thick. The layer of wood faces outside and the layer of wool faces inside. The thermal conductivity of wood is 0.08W/mK and the thermal conductivity of wool is 0.02W/mK. The temperature outside the house is 0oC and the temperature inside the house is 19.8 oC. What is the temperature (in oC) at the contact surface between the...
Consider an aluminum annular disk with an outer radius 63.2 mm and inner radius 7.9 mm....
Consider an aluminum annular disk with an outer radius 63.2 mm and inner radius 7.9 mm. The mass of the disk is 464 grams (HINT: the parameters of the disk are the same as in the previous pre-lab). The disk is allowed to rotate on a frictionless table with the rotation axis at its center. The disk has a small pulley rigidly mounted at the top concentrically. The pulley's radius is 12.1 mm, and the mass of the pulley is...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT