Bruce,
The MS Excel workbook is a tool that estimates BTU requirements and BTU rejection for water / oil heat exchangers. You enter core size, airspeed, duct size, air delta T assumptions, etc.. It is helpful in designing a rotary cooling system or may help with understanding what is being measuring in an underperforming system. I found it very useful. The file may not work with Libre or OpenOffice.
Bobby
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Monday, August 19, 2019 11:59 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Ed Anderson's Cooling Workbook
Note: when opening the file with LibreOffice on Linux the message external file could not be loaded
file:///C:/Documents and Settings/Ed Anderson/Local Settings/Temporary Internet Files/Content.IE5/ZBLVNTKS/My Documents/Duct Airflow BTU.xls
Is this file needed?
Thanks,
Bruce Finney
N18JF T-18C #262
Auburn, WA USA
On August 19, 2019 at 8:54 AM "eanderson@carolina.rr.com" <flyrotary@lancaironline.net> wrote:
Yes, I still enjoy andf monitor the rotary chat even if I am no longer flying behind one.
Talk about a blast from the past. I had forgotten about that cooling spreadsheet.
I have unprotected (I think) the 2nd sheet. At least I was able to change the airspeed fiactor from 0.3 to any value. Not certain if that takes care of the problem but its a start.
attached is the unprotected copy. Hope it may be of use as an educated guesstimate.
Anderson Electronic Enterprises LLC
305 Reefton Rd
Weddington, NC 28104 -0569
------ Original Message ------
Sent: 8/17/2019 12:23:54 PM
Subject: [FlyRotary] Ed Anderson's Cooling Workbook
I’m reposting Ed Anderson’s workbook from a long time ago that may help set cooling system expectations. Some of the fields are password protected and duct airspeed is locked down at 30%. Hopefully Ed Anderson is still monitoring this thread and can share his expertise and password to allow modification to cell C2 on the Cooling Calculations worksheet. Even without changed cell C2 we should be able to estimate BTU rejection by calculating the duct airspeed percentage. At 10%, BTU rejections should about 1/3 of the calculated value at 30%. Also my 2.75” coolant cores preform about 35% better than calculated when comparing air Delta T, fuel burn / HP.
Bobby
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