There are 2 options to be considered to form the insulation layer between the refractory brick and air space, which are fiberglass and firebrick. Calculate the minimum thickness required for the both fiberglass and firebrick. Which option do you recommend? Comment. State the assumption in your calculation. Based on your recommendation, calculate the temperature at each interface throughout the wall and draw a temperature variation diagram from inside wall surface to outside wall surface. 3" Refractory Fiberglass or firebrick? 0.5" Plaster brick Heat Ambient source Air space 4 Concrete block Figure 2

There are 2 options to be considered to form the insulation layer between the refractory brick and air space, which are fiberglass and firebrick. Calculate the minimum thickness required for the both fiberglass and firebrick. Which option do you recommend? Comment. State the assumption in your calculation. Based on your recommendation, calculate the temperature at each interface throughout the wall and draw a temperature variation diagram from inside wall surface to outside wall surface. 3" Refractory Fiberglass or firebrick? 0.5" Plaster brick Heat Ambient source Air space 4 Concrete block Figure 2

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.42P

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A furnace wall is to consist in series of 7 in of kaolin firebrick, 6 in of kaolin insulating brick, and sufficientfireclay brick to reduce the heat loss to 100 Btu/ hr ft2 when the face temperatures are 1500 and 100°F,respectively.a) Show the figure of the systemb) What thickness of fireclay brick should be used?c) If an effective air gap of 1/8 in can be incorporated between the fireclay and insulating brick whenerecting the wall without impairing its structural support, what thickness of insulating brick will berequired?
composite protective wall is formed of a 1 in copper plate, a 1/8 in layer of asbestos, a 2 in layer of fiberglass. The thermal conductivities of the materials in units of BTU/hr-ft-F are 240, 0.048 and 0.022 respectively. The overall temperature difference across the wall is 500 F. Calculate the heat transfer per unit area through the composite structure.
Solving Thermal Properties Related Problems Estimate the thermal diffusivity of butter at 20°C.
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Solve for this: A transparent film is to be bonded to a plate. For the bond to cure properly, a temperature of 65°C is to be maintained between the film and the plate. The transparent film is 3 mm thick and has a thermal conductivity of 0.05 W/m·K. The solid plate is 10 mm thick and has a thermal conductivity of 1.2 W/m·K. The convection heat transfer coefficient is 75 W/m2·K off of the film surface. If the bottom of the plateis maintained at 45°C, determine the ambient temperature and the surface temperature of the film.
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Solve this with diagram: An engine cover is made from 1 cm thick stainless steel plate (k = 14 W/m K). Air on the inside of the engine cover is heated to 340°C with a heat transfer coefficient of 7 W/m2K. Outside of the engine coverthe ambient air has a temperature of 70°C. If oil was spilled on the outside of the engine cover (ambient side), it could ignite if the surface temperature were to exceed 200°C. In this configuration, would spilled oil ignite? Use calculations to justify your answer. If a 4 mm thermal coating (k = 1.1 W/m K) was applied tothe outside of the engine, what would the outside temperature of the engine cover be reduced to?
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What is a composite wall? Derive the relevant equations for heat conduction through composite wall?
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