Along, horizontal, pressurized hot water pipe of 15cm diameter passes through a room where the air temperature is 24degree c. the pipe surface temperature is 130 degree c and the emissivity of the surface is 0.95. neglecting radiation loss from the pipe, what is the rate of the heat transfer to the room air per meter of pipe length

Rate of heat transfer to the room air per meter of pipe length equals 521.99 W/m

Explanation:

Since it is given that the radiation losses from the pipe are negligible thus the only mode of heat transfer will be by convection.

We know that heat transfer by convection is given by

where,

h = heat transfer coefficient = 10.45 (free convection in air)

A = Surface Area of the pipe

Applying the given values in the above formula we get

answer:

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