Figure 18-46 shows the cross section of a wall made of three layers. The layer thicknesses are L1, L2 = TH 0.700L1, and L3 0.350L1. The ther- Tc mal conductivities are k1, k2 = 0.900k1, and kz - 0.800k1. The temper- L Ls atures at the left side and right side of Figure 18-46 Problem 60. the wall are TH = 30.0°C and Tc = %3D -15.0°C, respectively. Thermal conduction is steady. (a) What is the temperature difference AT2 across layer 2 (between the left and right sides of the layer)? If k, were, instead, equal to 1.1k1, (b) would the rate at which energy is con- ducted through the wall be greater than, less than, or the same as pre- viously, and (c) what would be the value of AT,?

One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose the house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, then by what percentage would the heating cost of the house drop? Take the single story house to be of dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors.

The room thermostatis set at 68.0oC. What is thetemperature setting for the room indegrees Celsius(oC)and in Kelvin, respectively?

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