The Light Green Machine Institute




March 2020: The Optimization Problem, 3-D

By Jim Thompson
 
I let the model sit for a couple of months and I am glad I did.   While the math was correct before, two of my examples were impractical (that's what happens when an old imperial system guy tries to go metric.  So, this month we will recast the results from January and add a third dimension, height, to the problem.

Here we go:

A 1,000 tonne per day mill, manufacturing 200 gsm linerboard with a nominal trim width of 8,000 mm will operate at a speed of 434 meters/minute and occupy a machine floor of 2,054 square meters.  If built to a height of 15.24 meters (50 feet), it will contain 31,303 cubic meters. Perimeter wall length will be 245 meters.

Hold all variables constant except trim width (reduce to 5,400 mm) and the speed goes up to 643 meters/minute and the machine floor space is reduced to 1,664 square meters.  This building contains 25,360 cubic meters.  Yet, the perimeter wall length goes up to 273 meters.

Hold all variables constant except trim width (reduce to 2,800 mm) and the speed goes up to 1,240 meters/minute and the machine floor space is reduced to 1,274 square meters.  This building contains 19,415 cubic meters. In this case, the perimeter wall length goes up to 378 meters.

We will dig into these numbers further in coming months.

If you would like a copy of the spreadsheet to review and play with, send an email to jim.thompson@ipulpmedia.com.  I'll send you a confidentiality and waiver agreement, then, upon execution, send you the sheet.



  
As always, your comments will be appreciated.
 

Think light!

Jim Thompson
Founder
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