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A 50 mm × 45 mm × 20 mm cell phone charger has a surface temperature of Ts = 33°C when plugged into an electrical wall outlet but not in use. The surface of the charger is of emissivity ε = 0.92 and is subject to a free convection heat transfer coefficient of h = 4.5 W m¯² K−¹ The room air and wall temperatures are Too = 22°C and Tsur = 20°C, respectively. The electricity cost is C = $0.18/kWh. Assume there is no conductive heat transfer, the convection and radiation occur on all the surfaces of the charger except for the surface in contact with the outlet. = T₁ = 33°C &= 0.92 E₂ 9 conv grad 45 mm 20 mm 50 mm Tur=20°C Air T = 22°C h = 4.5 W/m²-K Determine the daily cost in $ of leaving the charger plugged in when not in use.

A 50 mm × 45 mm × 20 mm cell phone charger has a surface temperature of Ts = 33°C when plugged into an electrical wall outlet but not in use. The surface of the charger is of emissivity ε = 0.92 and is subject to a free convection heat transfer coefficient of h = 4.5 W m¯² K−¹ The room air and wall temperatures are Too = 22°C and Tsur = 20°C, respectively. The electricity cost is C = $0.18/kWh. Assume there is no conductive heat transfer, the convection and radiation occur on all the surfaces of the charger except for the surface in contact with the outlet. = T₁ = 33°C &= 0.92 E₂ 9 conv grad 45 mm 20 mm 50 mm Tur=20°C Air T = 22°C h = 4.5 W/m²-K Determine the daily cost in $ of leaving the charger plugged in when not in use.

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PROBLEM 2 = A 50 mm x 45 mm × 20 mm cell phone charger has a surface temperature of Ts = 33°C when plugged into an electrical wall outlet but not in use. The surface of the charger is of emissivity ε = 0.92 and is subject to a free convection heat transfer coefficient of h 4.5 W m-2 K-¹. The room air and wall temperatures are T∞ = 22°C and Tsur = 20°C, respectively. The electricity cost is C = $0.18/kWh. Assume there is no conductive heat transfer, the convection and radiation occur on all the surfaces of the charger except for the surface in contact with the outlet. T₁ = 33°C € = 0.92 Eg 9conv grad 45 mm 20 mm 50 mm Tur=20°C SUT Air T₁ = 22°C h = 4.5 W/m²-K Determine the daily cost in $ of leaving the charger plugged in when not in use.
Transcribed Image Text:PROBLEM 2 = A 50 mm x 45 mm × 20 mm cell phone charger has a surface temperature of Ts = 33°C when plugged into an electrical wall outlet but not in use. The surface of the charger is of emissivity ε = 0.92 and is subject to a free convection heat transfer coefficient of h 4.5 W m-2 K-¹. The room air and wall temperatures are T∞ = 22°C and Tsur = 20°C, respectively. The electricity cost is C = $0.18/kWh. Assume there is no conductive heat transfer, the convection and radiation occur on all the surfaces of the charger except for the surface in contact with the outlet. T₁ = 33°C € = 0.92 Eg 9conv grad 45 mm 20 mm 50 mm Tur=20°C SUT Air T₁ = 22°C h = 4.5 W/m²-K Determine the daily cost in $ of leaving the charger plugged in when not in use.
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