From: 
Allen Dittenhoefer <adittenhoefer@montrose-env.com>
Sent:
Friday, April 23, 2021 8:01 AM
To: 
Woody, Matthew <Woody.Matthew@epa.gov>
Cc:
Owen, Chris <Owen.Chris@epa.gov>; Jones, DonnaLee <Jones.Donnalee@epa.gov>; Contact <dailor@accci.org>
Subject: 
0.0787 Factor in F' Spreadsheet


Matt,
 
In reference to your question during yesterday's call, page 5 of the attached document we prepared on November 24, 2020 describes the origin of the 0.0787 factor, which represents the tangent of 4.5 degrees:
 
"In the formula, the air column thickness, Wside, along each battery side (push and coke sides) increases at a 4.5-degree angle from the base of the battery to the battery top, based on vertical plate heat transfer theory:
             
            Wside = H * Tan(4.5[o]) = H * (0.0787)
                                             
The air column cross-sectional area is equal to the column thickness at the battery top times the battery length."
 
Feel free to contact me if you have any further questions.
 
Regards,
 
Allen C. Dittenhoefer, Ph.D.
Principal
 

 
Montrose Environmental
45 U.S. Highway 46 East
Suite 601
Pine Brook, NJ 07058
Direct:    (973) 575-2555 (Ext. 12705)
Mobile    (205) 447-6225
adittenhoefer@montrose-env.com
www.envplanning.com



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