This page calculates the net radiant heat exchange for two isothermal (constant temperature) perpendicular flat black plates of different lengths but equal widths.

Define the plate size, spacing, and the plate temperatures. This page will calculate the view factor between plates 1 and 2 and calculate the net radiant heat exchange between the two plates using this view factor.

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Radiation Conditions

Description Symbol Value Units
Plate 1 Length L1 Meters
Plate 2 Length L2 Meters
Width W Meters
Plate 1 Temperature T1 K
Plate 2 Temperature T2 K

Results for Isothermal Plates

Description Symbol Value Units
x = L2/W x None
y = L1/W y None
z = x2+y2 z None
A = ln((1+x2)*(1+y2)/(1+z)) A None
B = y2*(ln(y2*(1+z)/(z*(1+ y2)))) B None
C = x2*(ln(x2*(1+z)/(z*(1+ x2)))) C None
D = y*tan-1(1/y)+x*tan-1(1/x)-(z)0.5*tan-1(1/z0.5) D None
View Factor(1-2) = (1/4*(A+B+C)+D)/(pi*y) VF(1-2) None
Heat Radiated = 56.69e-9*VF(1-2)*L1*W*(T14-T24) q W

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