TM-5-855-4
d. Duringthe holding period, the decreasing rate of heat transfer q to the rock that corresponds to
steady temperature T3 in the space is a function of heat flux ratio Y, Fourier number F, and Biot number B
= rU/K implicit in the rock conductance factor f(F,B), as shown by equation 3-14
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For the sphere Y =
e. The subscript of the Fourier number is that of the equivalent radius of the shape selected to model
the space. Conversely the model shape is a cylinder or a sphere depending on whether F1 or F2 is used in
the equations. However, the relevant parameters must always be used to correctly calculate any
dimensionless numbers such as F or B regardless of subscript.
3-4
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