Radiant Heat Parallel Plates Equation and Calculator

Heat Transfer Engineering
Thermodynamics
Engineering Physics

Net radiant heat exchange for two isothermal (constant temperature) parallel flat black plates of equal size equation and calculator. 

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Preview: Radiant heat exchange for two parallel flat black plates calculator

The heat flow (q) from the plate is calculated as:

q = 56.69 x 10-9 x VF(1-2) x A x (T14 - T24 )

Where 56.69 x 10-9 is the average Stefan-Bolzmann constant, A is the area of the plate, T1 is the plate 1 temperature and T2 is the plate 2 temperature. The view factor VF(1-2) (also known as radiation shape factor, angle factor, and configuration factor) is defined as:

radiation shape factor

Where:

x = L / D
y = W / D
L = Plate Length (m)
W = Plate Width (W)
D = Spacing (m)
T1 = Plate 1 Temperature (K)
T2 = Plate 2 Temperature (K)
VF = View Factor
q = Radiated Heat Flow (W)

References

Ellison G. N., Thermal Computations for Electronic Equipment , Van Nostrand Reinhold Company, New York, 1984. p. 78 - 79.

Holman, J.P., Heat Transfer , 7th ed., McGraw Hill Book Company, New York, 1990. p. 385 - 405.

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