Maurice Tutor

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About Maurice Tutor

Levels Tought:
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Expertise:
Algebra,Applied Sciences See all
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: 432 Weeks Ago, 2 Days Ago
Questions Answered: 66690
Tutorials Posted: 66688

Education

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

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 02 Jan 2018 My Price 2.00

radiative heater

13.74    A radiative heater consists of a bank of ceramic tubes with internal heating elements. The tubes are of diam-

 

2 m

 

 

1 m

0.5 m

 

 

 

 

Heated surface

 

eter D = 20 mm  and  are  separated  by  a distance s = 50 mm. A reradiating surface is positioned behind the heating tubes as shown in the schematic.  Deter-

 

Surroundings

Coated surface

 

mine the net radiative heat flux to the heated material when the heating tubes (sh = 0.87) are maintained at 1000 K. The heated material (sm = 0.26) is at a tem- perature of 500 K.

 

Heating element

(a)    What is the electrical power, qelec, required to operate the heater?

(b)    What is qelec if the surfaces are connected with reradiating sidewalls?

The facility may be used to cure different  surface

 

 

 

 

 

 

D = 20 mm

 

 

Material

T = 500 K

em = 0.26

Reradiating

T = 1000 K

eh  = 0.87

 

 

    s = 50 mm

coatings. With the heater still approximated as    a

blackbody, compute and plot qelec as a function of the coating’s emissivity for values ranging    from

0.1 to 1.0. Perform the calculations for both open and reradiating sides.

13.77 A cubical furnace 2 m on a side is used for heat treat- ing steel plate. The top surface of the furnace consists of electrical radiant heaters that have an emissivity of 0.8 and a power input of 1.5 x 105 W. The side- walls consist of a well-insulated refractory material,

Answers

Maurice Tutor
(5)
Status NEW Posted 02 Jan 2018 11:01 PM My Price 2.00

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