Radiant Heat Exchange Perpendicular Plates Equation and Calculator
Radiant heat exchange for two isothermal (constant temperature) perpendicular flat black plates of different lengths but equal widths 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 L 1 x W (T14 - T24 )
Where 56.69 x 10-9 is the average Stefan-Bolzmann constant, L1 is the length of plate 1, W the common width of both plates, 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: :
L1 = Length (m)
L2 = Length (m)
W = Width (m)
x = L1 / W
y = L2 / W
z = x2 + y2
T1 = Plate 1 Temperature (K)
T2 = Plate 2 Temperature (K)
VF1-2 = View Factor
q = Radiated Heat Flow (W)
Ellison G. N., Thermal Computations for Electronic Equipment , Van Nostrand Reinhold Company, New York, 1984. p. 78 - 80.
Holman, J.P., Heat Transfer , 7th ed., McGraw Hill Book Company, New York, 1990. p. 385 - 405.