Question

Heat is loss from a 100 mm diameter steam pipe placed horizontally in ambient air at 30 degree Celsius. If the Nusselt number is 25 W/m² K and thermal conductivity of the air is 0.03 W/m K, then heat transfer coefficient will be

a.

7.5 W/m² K

b.

16.5 W/m² K

c.

25 W/m² K

d.

30 W/m² K

Answer: (a).7.5 W/m² K

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Q. Heat is loss from a 100 mm diameter steam pipe placed horizontally in ambient air at 30 degree Celsius. If the Nusselt number is 25 W/m² K and thermal conductivity of the air is...

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