Comments on: Duct Design 4 — Calculating Friction Rate https://www.energyvanguard.com/blog/duct-design-4-calculating-friction-rate/ Building science knowledge, HVAC design, & fun Wed, 17 Mar 2021 21:03:43 +0000 hourly 1 https://wordpress.org/?v=6.6.2 By: Tom Podgurski https://www.energyvanguard.com/blog/duct-design-4-calculating-friction-rate/#comment-12465 Wed, 25 Sep 2019 17:31:59 +0000 http://energyvanguard.flywheelsites.com/?blog_post=duct-design-4-calculating-friction-rate#comment-12465 When the calculation of
When the calculation of Friction for a transition, using Ao/A1 ( area in and area out) then using the ashrae table SR-1 for transitions, or should we use velocity pressure in and out for friction,

]]> By: Fatemeh Nia https://www.energyvanguard.com/blog/duct-design-4-calculating-friction-rate/#comment-12319 Thu, 13 Jun 2019 20:22:25 +0000 http://energyvanguard.flywheelsites.com/?blog_post=duct-design-4-calculating-friction-rate#comment-12319 Thank you for posting such
Thank you for posting such great and informative articles. The definition of FR based on ASP and TEL is very helpful for duct sizing. Is there any reference for this equation?

]]> By: Whit Perry https://www.energyvanguard.com/blog/duct-design-4-calculating-friction-rate/#comment-10571 Fri, 02 Jun 2017 10:57:48 +0000 http://energyvanguard.flywheelsites.com/?blog_post=duct-design-4-calculating-friction-rate#comment-10571 The duct system is the
The duct system is the travesty of the HVAC industry. Unfortunately, our inspectors don’t understand or don’t care as the majority of the systems installed in the MidSouth don’t take the duct into consideration at all. It’s a nightmare out there. Actually, it’s appalling to see what they are doing to their customers. Municipalities should make it law that every home should have a duct design before any system is put in.

]]> By: Steve Waclo https://www.energyvanguard.com/blog/duct-design-4-calculating-friction-rate/#comment-10570 Thu, 01 Jun 2017 17:13:40 +0000 http://energyvanguard.flywheelsites.com/?blog_post=duct-design-4-calculating-friction-rate#comment-10570 “And poets use poetic
“And poets use poetic notation, which really doesn’t make any sense but it’ll make you cry tears of joy.”

Hey Allison, I thought that is called poetic license :).

In my endearing, self-deprecating fashion, let me once again submit a query that broadcasts my ignorance.

My limited understanding of air delivery in duct systems recalls there are different cfm requirements between the heating and cooling season. How does that fun fact play into calculations you have so eloquently described?

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