A 3.0 m2 hot black surface at 80oC is losing heat to the surrounding air at 25oC by convection with a convection heat transfer coefficient of 12 W/m2-oC, and by radiation to the surrounding surfaces at 15oC. Determine the total rate of heat loss from the surface in W.
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3 comments:
How do we solve for the radiation heat transfer if we do not have an emissivity coefficient?
Dear anonymous,
You can use an emissivity coefficient of 1 because it is described as "black". Sigma is 5.67E-08 W/(m^2 K^4).
ANSWERS:
Qtotal = 3453 W
HINTS:
Your total heat transfer rate is the sum of that from convection and radiation. Ts is the surface temperature, and Tf is air.
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