Example 6.1. A horizontal steel pipe having a diameter of 50 mm is maintained at a temperature of 50°C in a large room where the air and wall temperature are at 25°C. The heat is lost by free convection and radiation. The surface emissivity of the steel may be taken as 0.8. An estimate for the heat transfer coefficient for free convection with this geometry and air is 6.5 W/m² °C. Calculate the total heat lost by the pipe per unit length.

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A: For a detailed solution, please see the attached files.

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