12.6-1. Insulation Needed for Food Cold Storage Room. A food cold storage room is to be constructed of an inner layer of 19.1 mm of pine, a middle layer of cork board, and an outer layer of 50.8 mm of concrete. The inside wall surface temperature is -178°C and the outside surface temperature is 29.4°C at the outer concrete surface. The mean conductivities are for pine, 0.151; cork, 0.0433; and concrete, 0.762 W/m K. The total inside surface area of the room to use in the calculation is approximately 39 m2 (neglecting corner and end effects). What thickness of cork board is needed to keen the heat loss to 586 W?

Question
12.6-1. Insulation Needed for Food Cold Storage Room. A food cold storage room is to be
constructed of an inner layer of 19.1 mm of pine, a middle layer of cork board, and
an outer layer of 50.8 mm of concrete. The inside wall surface temperature is -178°C
and the outside surface temperature is 29.4°C at the outer concrete surface. The
mean conductivities are for pine, 0.151; cork, 0.0433; and concrete, 0.762 W/m K.
The total inside surface area of the room to use in the calculation is approximately
39 m2 (neglecting corner and end effects). What thickness of cork board is needed to
keen the heat loss to 586 W?
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Transcribed Image Text

12.6-1. Insulation Needed for Food Cold Storage Room. A food cold storage room is to be constructed of an inner layer of 19.1 mm of pine, a middle layer of cork board, and an outer layer of 50.8 mm of concrete. The inside wall surface temperature is -178°C and the outside surface temperature is 29.4°C at the outer concrete surface. The mean conductivities are for pine, 0.151; cork, 0.0433; and concrete, 0.762 W/m K. The total inside surface area of the room to use in the calculation is approximately 39 m2 (neglecting corner and end effects). What thickness of cork board is needed to keen the heat loss to 586 W?