Answers to this question. a) 1.83 W/m2K, (1825 W/m), 3.79 W/m2K, (5000 W/m) b) 5

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Answers to this question.

a) 1.83 W/m2K, (1825 W/m), 3.79 W/m2K,(5000 W/m)

b) 5.1

A kiln uses a heat shield to reduce the heat loss to the ambient as shown in Figure 3. During operation the shield temperature is 350 degree C while the kiln surface temperature is 600 degree C. It is necessary to consider both convection and radiation heat transfer modes in the system. The kiln surface emissivity is 0.65 and is independent of wavelength. The shield is thin and has a negligible temperature difference between the inside and outside surfaces. Determine the convective heat transfer coefficients between the kiln surface and the heat shield, the heat shield and the ambient, Hence, determine the convective heat transfer rate to and from the heat shield. Determine expressions for the radiative heat transfer between the kiln surface and the heat shield, the heat shield and the ambient. Using an appropriate heat balance and calculations, determine the emissivity of the heat shield. Calculate the reduction in heat loss due to the shield and comment on the effectiveness of the heat shield. It is not necessary to recalculate the convective heat transfer coefficients. The following additional information is provided: The heat transfer correlation for two vertical surface of height L, separated by a distance of delta is The heat transfer correlation for a single vertical surface of height L, is The Stefan-Boltzmann constant, sigma, is 5.7 Times 10-8. Thermal properties of air:

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