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How do you calculate the radiative heat transfer coefficient?

Answer 1

#h_(rad) = εσ(T_1^2 + T_2^2)(T_1 + T_2)#

The Stefan-Boltzman law relates the total amount of radiation emitted by an object to its temperature: ε=σT4 where: ε = total amount of radiation emitted by an object per square meter (Watts #m^(-2)#) (emissivity) σ is a constant called the Stefan-Boltzman constant = 5.67 x 10-8 (Watts #m^(-2)#)#K^(-4)# T is the temperature of the object in K.

The comparison of a material's actual emissivity to a "black body" is known as radiative heat transfer.

Radiative exchange between two gray, diffuse surfaces may be characterized by calculating the radiative heat transfer coefficient as shown below: #h_(rad) = εσ(T_1^2 + T_2^2)(T_1 + T_2)#

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Answer 2

Audrey Arnold

The formula for calculating the radiative heat transfer coefficient (hr) is: hr = ε * σ * (T^4 - Ts^4). Where: - σ is the Stefan-Boltzmann constant (5.67 x 10^-8 W/m^2K^4), - T is the absolute temperature of the radiating surface (in Kelvin), - Ts is the absolute temperature of the surroundings (in Kelvin). The radiative heat transfer coefficient (hr) is expressed in watts per square meter per Kelvin (W/m^2K).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.