A highly engineered Ecto-Containment System Protection Grid produces about 8 kW of waste heat in thesystem. A less highly-engineered tubular cross-flow heatsink is designed to dissipate that heat. In this case, the heat sink is a single long pipe carrying anti-freeze through the unit. The pipe has an OD of 80mm and and ID of 16mm. Assume that there is no resistance between the anti-freeze and the OD of the pipe (infinite conduction). Convection is forced, with an airflow of 12 m/s air across it Pr,air = 0.72, density(p) = 1.2 kg/m3, u = 16.83x10−6 Pa − S, k = 0.025 W/mk). The outside air is at 25℃ while the antifreeze is at 180℃. a) Find the Reynold’s Number of flow over the Pipe b) Find the convection coefficient across the pipe c) How long must the pipe be to dissipate all 8kW?
A highly engineered Ecto-Containment System Protection Grid produces about 8 kW of waste heat in thesystem. A less highly-engineered tubular cross-flow heatsink is designed to dissipate that heat.
In this case, the heat sink is a single long pipe carrying anti-freeze through the unit. The pipe has an OD of 80mm and and ID of 16mm. Assume that there is no resistance between the anti-freeze and the OD of the pipe (infinite conduction). Convection is forced, with an airflow of 12 m/s air across it Pr,air = 0.72, density(p) = 1.2 kg/m3, u = 16.83x10−6 Pa − S, k = 0.025 W/mk). The outside air is at 25℃ while the antifreeze is at 180℃.
a) Find the Reynold’s Number of flow over the Pipe
b) Find the convection coefficient across the pipe
c) How long must the pipe be to dissipate all 8kW?
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