The reason for using two load contact starter to control a single-phase motor operates on 240 volts.

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13.44 The end of a cylindrical liquid cryogenic propellant tank in free space is to be protected from external (solar) radiation by placing a thin metallic shield in front of the tank. Assume the view factor Fts between the tank and the shield is unity; all surfaces are diffuse and gray, and the surroundings are at 0 K. Tank T₁ Shield, T T₁ = 100 K E1 Solar irradiation Gs ε₁ = ε₂ = 0.05 ε₁ = 0.10 Gs = 1250 W/m² E2 Find the temperature of the shield T, and the heat flux (W/m²) to the end of the tank.

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Chapter 3, Problem 3RQ

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The reason for using two load contact starter to control a single-phase motor operates on 240 volts.

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13.44 The end of a cylindrical liquid cryogenic propellant tank in free space is to be protected from external (solar) radiation by placing a thin metallic shield in front of the tank. Assume the view factor Fts between the tank and the shield is unity; all surfaces are diffuse and gray, and the surroundings are at 0 K. Tank T₁ Shield, T T₁ = 100 K E1 Solar irradiation Gs ε₁ = ε₂ = 0.05 ε₁ = 0.10 Gs = 1250 W/m² E2 Find the temperature of the shield T, and the heat flux (W/m²) to the end of the tank.

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13.38 Consider the attic of a home located in a hot climate. The floor of the attic is characterized by a width of L₁ = 8 m while the roof makes an angle of 0 = 30° from the horizontal direction, as shown in the schematic. The homeowner wishes to reduce the heat load to the home by adhering bright aluminum foil (ε = 0.07) onto the surfaces of the attic space. Prior to installation of the foil, the surfaces are of emissivity & = 0.90. Attic A2, 82, T2 0 = 30° A1, E1, T₁ 土 L₁ = 8 m (a) Consider installation on the bottom of the attic roof only. Determine the ratio of the radiation heat transfer after to before the installation of the foil. (b) Determine the ratio of the radiation heat transfer after to before installation if the foil is installed only on the top of the attic floor. (c) Determine the ratio of the radiation heat transfer if the foil is installed on both the roof bottom and the floor top.