Plotting the Load Temperature Profile

Overview of the method (Letters correspond to worksheet lines, tables 8.5 to 8.9.) 

As the final steps for the first group of 3 units, on figure 8.5 or 8.11, p/ol furnace temperatures [b, c] if not already done in phases C and D. Then, plot load average temperature [1] at the end of the 3 increment as the first point on the average temperature curve. Next, plot load bottom temperature [1 again] at [o] minutes to the right of pi as the first point on the bottom temperature curve. Finally, plot load top temperature [1 again] at [n] minutes to the left of pi as the first point on the top temperature curve. 

NEXT ITERATION Visually extrapolate the average temperature curve to estimate a new [d] in the next group of 3 units on table 8.5. 

Procedure—phase E. (This is a repetition of the overview above, but with more detailed explanations.) On copies of the blank worksheets from tables 8.5 and 8.6, at line [b] enter the average furnace temperature for each of the 7 groups of 3 increments that you plotted on your graph, figure 8.5, as a result of procedures C and D. Because our example is for one-side heating, skip lines [c] and [1], Estimate the average load surface temperature for the first group of 3 increments, and enter it on line [d]. 

In table 8.7, enter the difference between the black body radiation rate for furnace temperature [b] and load temperature [d], on line [i]. Multiply [i] by 3H, for the 3 unit group, and enter the resulting Btu/pound heat content rise of the load on line j]. The Shannon method s H factor reduces black body radiation by the effect of emis-sivity (absorptivity). In succeeding columns, use line [k] to totalize the cumulative Btu/pound. In figure 8.9, convert the new Btu/pound heat content to a new average temperature throughout the load (270 F for the first three time units), and record it on line [1], 

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