The composite insulation shown, which was described in

Chapter , Problem 13.11

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The composite insulation shown, which was described in Chapter 1 ( 1.86e), is being considered as a ceiling material. It is proposed that the outer and inner slabs be made from low-density particle board of thicknesses L1 L3 12.5 mm and that the honeycomb core be constructed from a high-density particle board. The square cells of the core are to have length L2 50 mm, width W 10 mm, and wall thickness t 2 mm. The emissivity of both particle boards is approximately 0.85, and the honeycomb cells are filled with air at 1-atm pressure. To assess the effectiveness of the insulation, its total thermal resistance must be evaluated under representative operating conditions for which the bottom (inner) surface temperature is Ts,i 25C and the top (outer) surface temperature is Ts,o 10C. To assess the effect of free convection in the air space, assume a cell temperature difference of 20C and evaluate air properties at 7.5C. To assess the effect of radiation across the air space, assume inner surface temperatures of the outer and inner slabs to be 5 and 15C, respectively. 13.111

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