Question

A body at 1100ºC in a black surrounding at 550ºC has an emissivity of 0.4 at 1100ºC and emissivity of 0.7 at 550ºC. Calculate the rate of heat loss by radiation per unit surface area: i) when the body is assumed to be grey with emissivity 0.4 ii) when the body is not grey. (Assume absorptivity is independent of the surface temperature)

Name: a body at 1100oc in a black surrounding at 550oc has emissivity of 04 at 1100oc and emissivity 07 at 550oc calculate the rate of heat loss by radiation per unit surface area i when the body 09861
Uploaded: 2023-06-13T23:54:05-08:00
Duration: 2 min
Channel: Adi S
Description: a body at 1100oc in a black surrounding at 550oc has emissivity of 04 at 1100oc and emissivity 07 at 550oc calculate the rate of heat loss by radiation per unit surface area i when the body 09861

          A body at 1100ºC in a black surrounding at 550ºC has an emissivity of 0.4 at 1100ºC and emissivity of 0.7 at 550ºC. Calculate the rate of heat loss by radiation per unit surface area:
i) when the body is assumed to be grey with emissivity 0.4
ii) when the body is not grey.
(Assume absorptivity is independent of the surface temperature)

Added by Eva H.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Adi S

06/13/2023

Step 1

4: We can use the Stefan-Boltzmann Law to calculate the rate of heat loss by radiation per unit surface area. The formula is: $$Q = e \sigma A (T_1^4 - T_2^4)$$ Where: - $Q$ is the rate of heat loss by radiation per unit surface area - $e$ is the emissivity of Show more…

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A body at 1100ºC in a black surrounding at 550ºC has an emissivity of 0.4 at 1100ºC and emissivity of 0.7 at 550ºC. Calculate the rate of heat loss by radiation per unit surface area: i) when the body is assumed to be grey with emissivity 0.4 ii) when the body is not grey. (Assume absorptivity is independent of the surface temperature)