12. A refrigerator wall consists of low-carbon steel (1C) 1 mm thick on the outside, 2...

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12. A refrigerator wall consists of low-carbon steel (1C) 1 mm thick on the outside, 2 mm thick poly- styrene inside, with 2 cm thick expanded cork between as an insulation, as shown in Figure P2.12. The T- 25°C Tu = 10°C 1C steel 1 mm thick- - 2 mm thick polystyrene 2 cm thick expanded cork FIGURE P2.12 Outside the refrigerator wall, the air temperature is 25°C, and the heat-transfer coefficient is 3 W/(m2. K). Inside the refrigerator, the air temperature is 10°C, and the film coefficient at the wall is 4.5 W/(m2. K). a. Determine the overall heat-transfer coefficient for the wall. b. Determine the heat flow through the wall. 12. A refrigerator wall consists of low-carbon steel (1C) 1 mm thick on the outside, 2 mm thick poly- styrene inside, with 2 cm thick expanded cork between as an insulation, as shown in Figure P2.12. The T- 25°C Tu = 10°C 1C steel 1 mm thick- - 2 mm thick polystyrene 2 cm thick expanded cork FIGURE P2.12 Outside the refrigerator wall, the air temperature is 25°C, and the heat-transfer coefficient is 3 W/(m2. K). Inside the refrigerator, the air temperature is 10°C, and the film coefficient at the wall is 4.5 W/(m2. K). a. Determine the overall heat-transfer coefficient for the wall. b. Determine the heat flow through the wall.

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Given Data A The overall Heat T... View the full answer