Homework Answers
Solution:
Here,
Assumptions:
Surfaces are diffuse grey
Duct is very long
End effects are negligible
Therefore,
Since the third wall is adiabatic or completely insulated so there is no effect of change of emissivity.
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Consider a long duct constructed with diffuse and gray walls. The width of each wall is...
Consider a long duct constructed with diffuse and gray walls. The width of each wall is...
Consider a long duct constructed with diffuse and gray walls.
The width of each wall is 1 m. Heat transfer is from surface 1 to
surface 2, while surface 3 is completely insulated and cannot
absorb heat (which means q3 = 0).
Provide a sketch and state your assumptions
Determine the net radiation transfer from surface A1 per unit
length of the duct.
Determine the temperature of the insulated surface A3.
Use 1 sentence to describe the effect of changing...
Consider a long duct constructed with diffuse and gray walls. The width of each wall is...
Consider a long duct constructed with diffuse and gray walls. The width of each wall is 1 m. Heat transfer is from surface 1 to surface 2, while surface 3 is completely insulated and cannot absorb heat (which means 93 = 0). Az, T2 = 700 K, Ez = 0.5 A4, T1 = 1000 K, £z = 0.33- -A3, T3 , £z = 0.8 a. Provide a sketch and state your assumptions b. Determine the net radiation transfer from surface...
heat transfer question Consider a long duct constructed with diffuse and gray walls. The width of...
heat transfer question
Consider a long duct constructed with diffuse and gray walls. The width of each wall is 1 m. Heat transfer is from surface 1 to surface 2, while surface 3 is completely insulated and cannot absorb heat (which means 93 = 0). A2, T2 = 700 K, £= 0.5 Aj, T1 = 1000 K, £1 = 0.33 -A2, T3, E3 = 0.8 a. Provide a sketch and state your assumptions b. Determine the net radiation transfer from...
It's a heat transfer question Consider a long duct constructed with diffuse and gray walls. The...
It's a heat transfer question
Consider a long duct constructed with diffuse and gray walls. The width of each wall is 1 m. Heat transfer is from surface 1 to surface 2, while surface 3 is completely insulated and cannot absorb heat (which means 93 = 0). Az, T2 = 700 K, Ey = 0.5 Aj, T = 1000 K, E1 = 0.33 A - Ag, T3, Ez = 0.8 IRI a. Provide a sketch and state your assumptions b....
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A small object with an opaque, diffuse surface at a temperature
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Consider a long duct constructed with diffuse and gray walls.
The width of each wall is 1 m. Heat transfer is from surface 1 to
surface 2, while surface 3 is completely insulated and cannot
absorb heat (which means q3 = 0).
Provide a sketch and state your assumptions
Determine the net radiation transfer from surface A1 per unit
length of the duct.
Determine the temperature of the insulated surface A3.
Use 1 sentence to describe the effect of changing...
Consider a long duct constructed with diffuse and gray walls. The width of each wall is 1 m. Heat transfer is from surface 1 to surface 2, while surface 3 is completely insulated and cannot absorb heat (which means 93 = 0). Az, T2 = 700 K, Ez = 0.5 A4, T1 = 1000 K, £z = 0.33- -A3, T3 , £z = 0.8 a. Provide a sketch and state your assumptions b. Determine the net radiation transfer from surface...
heat transfer question
Consider a long duct constructed with diffuse and gray walls. The width of each wall is 1 m. Heat transfer is from surface 1 to surface 2, while surface 3 is completely insulated and cannot absorb heat (which means 93 = 0). A2, T2 = 700 K, £= 0.5 Aj, T1 = 1000 K, £1 = 0.33 -A2, T3, E3 = 0.8 a. Provide a sketch and state your assumptions b. Determine the net radiation transfer from...
It's a heat transfer question
Consider a long duct constructed with diffuse and gray walls. The width of each wall is 1 m. Heat transfer is from surface 1 to surface 2, while surface 3 is completely insulated and cannot absorb heat (which means 93 = 0). Az, T2 = 700 K, Ey = 0.5 Aj, T = 1000 K, E1 = 0.33 A - Ag, T3, Ez = 0.8 IRI a. Provide a sketch and state your assumptions b....
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(20) Radiation is emitted from a small opening (A 10 m2) of a furnace in which surface temperature is constant to be 2000K. The inner surface of the furnace is diffuse and gray (E-0.5). A portion of this radiation is intercepted by three detectors that are 0.5m from the aperture as shown below. The area of three detectors is the same as 10 m2 The area of the opening of the furnace and detectors can be considered as...
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4.16 Two large diffuse gray parallel plates, separated by a small distance, have surface temperature of 400 K and 300 K. IF the emissivities of the surfaces are 0.8 and the Stefan-Boltzmann constant is 5.67 x 10-8 W/m3K4, the net radiation heat exchange rate in kW/m2 between the two plates is (a) 0.66 (c) 0.99 (b) 0.79 (d) 3.96
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
A small object with an opaque, diffuse surface at a temperature
of 500 K is suspended in a large furnace with walls at 2000 K.
Assume that the walls of the furnace provide a diffuse irradiation
to the object at a blackbody temperature equal to the furnace wall
temperature. The object’s surface has a spectral hemispherical
emissivity and absorptivity as given below. (a) Determine the total
emissivity and total absorptivity of the object’s surface. Partial
Ans: ?=0.021 (b) Evaluate the...
Done Expert Q&A Consider the perpendicular rectangles shows ieally. -04 0 03 -0.2m r-0.5m Determine the shape factor F 02 A drying oven consists of a long semicincular dact of diameter D 1m. T-1200 -325K D-1 Materials to be dried cover the base of the oven while the wall is maintained at 1200 K. What is the drying rate per unit length of the oven Okpls-m) if a water coted layer of material is maintained at 323 K doring the...
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