Maurice Tutor

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About Maurice Tutor

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Expertise:
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Algebra,Applied Sciences,Biology,Calculus,Chemistry,Economics,English,Essay writing,Geography,Geology,Health & Medical,Physics,Science Hide all
Teaching Since: May 2017
Last Sign in: 408 Weeks Ago
Questions Answered: 66690
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Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 22 Nov 2017 My Price 9.00

spectral emission

12.19   The dark surface of a ceramic stove top may be approximated as a blackbody. The “burners,” which are integral with the stove top, are heated from below by electric resistance heaters.

 

 

Burner, Ts

D

 

Hence intensities  at  any  points  P1  and  P2  would be equal.

 

n

Stove top

 

 

Heater, Pelec

 

 

P2

 

 

Io,e (q,f)

 

 

P1

q

 

f

 

Eo, D Ao

 

Hemispherical surface, r = R1

n

D A2 = 2 ´ 2 mm

 

q = 45°

 

 

 

 

Eo, D Ao

 

 

(a)   Consider a burner of diameter D = 200 mm operating at a uniform surface temperature   of Ts = 250°C in ambient air at T00 = 20°C. With- out a pot or pan on the burner, what are the rates of heat loss by radiation and convection from

the burner? If the efficiency associated with energy transfer from the heaters to the burners is 90%, what is  the  electric  power  requirement? At what wavelength is the spectral emission a maximum?

(a)    What is the rate at which radiant energy is emitted

by 11Ao, qemit?

(b)   What is the intensity Io,e of the radiation field emit- ted from the surface 11Ao?

(c)    Beginning with Equation 12.13 and presuming knowledge of the intensity Io,e, obtain an expres- sion for qemit.

(d)   Consider the  hemispherical  surface  located at r = R1 = 0.5 m. Using the conservation of energy requirement, determine the rate at which radiant energy is incident on this surface due to emission from 11Ao.

(e)    Using Equation 12.10, determine the rate at which radiant energy leaving 11Ao is intercepted by the small area 11A2 located in the direction (45°, ) on the hemispherical surface. What is the irradiation on 11A2?

(f)    Repeat part (e) for the location (0°, ). Are the irradiations at the two locations equal?

(g)   Using Equation 12.18, determine the irradiation

G1 on the hemispherical surface at r = R1.

(b) Compute and plot the effect of the burner tempera- ture on the heat rates for 100 Ts 350°C.

 

Answers

Maurice Tutor
(5)
Status NEW Posted 22 Nov 2017 01:11 PM My Price 9.00

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