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Auxilliary Calculations
DOI 10.1615/hedhme.a.000252
3.3.6 Auxiliary calculations
J. Taborek
Based on the input data defined in Section 251, there are a number of calculations required to be able to compute the various correction factors, flow areas, surfaces, and so on, as needed for the ultimate purpose of determining the shell-side heat transfer coefficient and pressure drop. These auxiliary calculations are defined in this section.
A. Segmental baffle window calculations
Referring to Figure 1, which illustrates the basic segmental baffle geometry in relation to the tube field, we calculate first the centri-angle of the baffle cut intersection with the inside shell wall, θds and the angle intersecting the diameter Dctl, that is, the circle through the centers of the outermost tubes, Dctl = Dotl – Dt (see Section 251).
\[\label{eq1} \theta_{ds} = 2 \cos^{-1} \left[1 - 2\left(\frac{B_{c}}{100}\right)\right] \quad(\mbox{deg})\tag{1}\]
\[\label{eq2} \theta_{ctl} = 2 \cos^{-1} \left\{\frac{D_{s}}{D_{ctl}}\left[1 - 2\left(\frac{B_{c}}{100}\right)\right]\right\}\quad(\mbox{deg})\tag{2}\]
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