Equal friction method for duct sizing

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SUMMARY

The discussion centers on the equal friction method for duct sizing, specifically addressing confusion regarding the deltaP/L column in a results table. Participants highlight the expectation that values should consistently reflect 0.063 in.wg / 100ft or 0.5 Pa/m, as the method aims for uniform pressure loss across the system. Additionally, there are concerns about the accessibility of shared documents, with suggestions to use visible images instead of downloadable files. The conversation emphasizes the importance of clarity in presenting technical data for effective problem-solving.

PREREQUISITES
  • Understanding of duct sizing principles
  • Familiarity with pressure loss calculations in HVAC systems
  • Knowledge of the equal friction method in duct design
  • Basic skills in document sharing and image editing tools
NEXT STEPS
  • Research the equal friction method for duct sizing in HVAC systems
  • Learn about pressure loss calculations specific to steel ducts
  • Explore tools for creating and sharing technical documents effectively
  • Investigate methods for compressing image files in document formats
USEFUL FOR

HVAC engineers, mechanical design students, and professionals involved in duct design and pressure loss analysis will benefit from this discussion.

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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