Equal friction method for duct sizing

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Discussion Overview

The discussion revolves around the equal friction method for duct sizing, specifically addressing the interpretation of pressure loss values in a results table. Participants are examining the implications of these values in the context of duct design and pressure loss calculations.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the origin of the values in the deltaP/L column, suggesting they should all be uniform according to the equal friction method.
  • Another participant expresses difficulty accessing the attached document and suggests uploading images directly to facilitate discussion.
  • There is a humorous exchange regarding the size of the document and its contents, with one participant speculating that the large file size is due to uncompressed images from a textbook.
  • A participant raises a question about whether the deltaP/L column applies only to straight pipe sections and not to equivalent lengths.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the interpretation of the deltaP/L column, and multiple viewpoints regarding the document's accessibility and content are present.

Contextual Notes

The discussion includes uncertainties regarding the definitions and assumptions related to the equal friction method and the specific application of pressure loss calculations.

pinkcashmere
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Homework Statement


In the attachment.

Homework Equations


Chart of pressure loss due to friction for steel ducts : http://postimg.org/image/4iml9x761/

The Attempt at a Solution


I don't understand the deltaP/L column of the results table.
Where did the values come from? Shouldn't they all be 0.063 in.wg / 100ft or 0.5 Pa/m since the principle of the equal friction method is to have the same pressure loss per length for the entire system?
 

Attachments

Physics news on Phys.org
Hi pinkcashmere. I don't know if others have the same difficulty, but I can't see anything in your docx attachment. Can you grab some relevant images (perhaps with a snipping tool) and upload them so they are visible in the thread? You will get better results here at PF if helpers don't have to download files from offsite and they can see the problem without having to click through to images.
 
gneill said:
Hi pinkcashmere. I don't know if others have the same difficulty, but I can't see anything in your docx attachment. Can you grab some relevant images (perhaps with a snipping tool) and upload them so they are visible in the thread? You will get better results here at PF if helpers don't have to download files from offsite and they can see the problem without having to click through to images.

Hi gneill,
I printed out the Word document pinkcashmere posted as an Acrobat file, which is attached below.
 

Attachments

SteamKing said:
Hi gneill,
I printed out the Word document pinkcashmere posted as an Acrobat file, which is attached below.
Thanks. Wow! 2.4 MB docx file becomes a 171 KB pdf, and it boils down to a half page of text. I have seen the end of civilization, and it is a result of bloatware :smile::smile::smile:

edit: okay, I didn't page down. A page and a half of text o_O
 
gneill said:
Thanks. Wow! 2.4 MB docx file becomes a 171 KB pdf, and it boils down to a half page of text. I have seen the end of civilization, and it is a result of bloatware :smile::smile::smile:
The reason the .docx file was so huge, I believe, was that it consisted of several pages scanned from a textbook. Those image files are generally dumped into the .docx file with no compression.
 
pinkcashmere said:
I don't understand the deltaP/L column of the results table.
Is not this column for straight pipe only (not equivalent length)?
 

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