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

q = 56.69 x 10^{-9} x VF_{(1-2)} x A x (T_{1}^{4} - T_{2}^{4} )

Where 56.69 x 10^{-9} is the average Stefan-Bolzmann constant, *A *is the area of the plate, T_{1} is the plate 1 temperature and *T _{2} *is the plate 2 temperature. The view factor

*VF*(also known as radiation shape factor, angle factor, and configuration factor) is defined as:

_{(1-2)}Where:

x = L / D

y = W / D

L = Plate Length (m)

W = Plate Width (W)

D = Spacing (m)

T_{1} = Plate 1 Temperature (K)

T_{2} = 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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