Two horizontal steam mains with diameters 5 cm and 15 cm are to be laid in a boi

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Two horizontal steam mains with diameters 5 cm and 15 cm are to be laid in a boiler house that any mutual heat effect is precluded. The mains are at the same surface temperature of 500 degree Celsius whilst the ambient air is at 50 degree Celsius. Workout the heat losses from one meter length of the mains

Options:

A . 0.458

B . 0.448

C . 0.438

D . 0.428

Answer: Option C
Answer: (c).0.438

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