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An exposed 8 cm external diameter, 20 m long hot-water pipe at 80C is losing heat to the surrounding (outdoor) air by natural convection.

An exposed 8 cm external diameter, 20 m long hot-water pipe at 80C is losing heat to the surrounding (outdoor) air by natural convection. The average outdoor temperature is 5C. The heat transfer coefficient is 25 W/m2C. What is the heat loss by natural convection, in kW? A. 9.4 W B. 10.0 W C. 10.4 W D. 11.4 W

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