Determine the amounts of reflected and absorbed energies

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Reference no: EM131283347

A blackbody radiation source at Ti = 500?C is used to irradiate three different surfaces, namely,

(i) aluminum (commercial sheet),

(ii) nickel oxide, and

(iii) paper. The irradiating surfaces have an area Ar = 1 m2 and are assumed gray, diffuse, and opaque. Use the emissivities in Table C.18 [for

(ii) extrapolate; for others use the available data].

(a) Sketch the radiation heat transfer arriving and leaving the surface, showing the blackbody emitter and the irradiated surface [see Figure 4.9(b)]. Show heat transfer as irradiation Qr,i, absorption Qr,α, reflection Qr,ρ, emission Qr,, and radiosity Qr,o (sum of emission and reflection).

(b) If the three surfaces are kept at T_s = 100?C, determine the amounts of reflected and absorbed energies.

(d) Determine the net radiation heat transfer rate for each surface. Which surface experiences the highest amount of radiation heating?

Reference no: EM131283347

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