A large commercial freezer's door has a 2.5 cm thick layer of insulation (kin = 0.04...
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A large commercial freezer's door has a 2.5 cm thick layer of insulation (kin = 0.04 W/m2K) covered on the inside and outside with a 3.2 mm thick aluminum skin (kajl = 165 W/m²K). The door closes against a plastic covered magnetic seal 1 cm wide. Heat loss through the door can result from conduction straight through the insulation and skins and from conduction around the edges of the aluminum skin. For this problem, assume that the magnetic seal is perfectly adiabatic. The heat transfer coefficients to the air inside (h;) and to the air outside (ho) are each 12 W/m2K. The temperature outside the freezer is 25°C. The temperature inside is -15°C. A. If the door is 1 m wide, estimate the one-dimensional heat loss through the door, neglect- ing any edge effects. Your answer will be per meter of door length. -aluminum skin (3.2 mm thick) -insulation 25°C 2.5cm Tuaquetic 1 m seal Freezer -15°C A large commercial freezer's door has a 2.5 cm thick layer of insulation (kin = 0.04 W/m2K) covered on the inside and outside with a 3.2 mm thick aluminum skin (kajl = 165 W/m²K). The door closes against a plastic covered magnetic seal 1 cm wide. Heat loss through the door can result from conduction straight through the insulation and skins and from conduction around the edges of the aluminum skin. For this problem, assume that the magnetic seal is perfectly adiabatic. The heat transfer coefficients to the air inside (h;) and to the air outside (ho) are each 12 W/m2K. The temperature outside the freezer is 25°C. The temperature inside is -15°C. A. If the door is 1 m wide, estimate the one-dimensional heat loss through the door, neglect- ing any edge effects. Your answer will be per meter of door length. -aluminum skin (3.2 mm thick) -insulation 25°C 2.5cm Tuaquetic 1 m seal Freezer -15°C
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