Ductwork sizing, calculation and design for efficiency - HVAC Basics + full worked example
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- Опубликовано: 24 июн 2018
- How to design a duct system. In this video we'll be learning how to size and design a ductwork for efficiency. Includes a full worked example as well as using CFD simulations to optimise the performance and efficiency. FREE SimScale account (www.simscale.com/)
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Done ;-)
comment the photo of the Duct Pressure Loss Chart Please :(
@@JudgeFredd so 33
Could you do one about fabric ductwork?
So much of this was over my head but I was able to follow the overall concept. Given the fact I’m not even close to being called an engineer, you really lived up to your channel name. Excellent job of explaining complex issues, in an understandable way, without making me feel condescended to, thank you.
Yes I suffered many a nose bleed during this video
Just enjoyed your video for the first time today on its 4th anniversary. 690,606 views is a testament to how well delivered the material was in your video. As I find myself less and less confident in contractors of late, it is appreciated that you are providing content to empower viewers with knowledge that might have felt out of reach initially. Thanks again and many well wishes for continued success for you and your channel.
Yeah this is pretty cool. Im a sheet metal apprentice, specializing in ductwork for commercial jobs. Interesting to see how the ductwork I make is designed and such. Great video!
This was a fantastically simple overview of the engineering process needed to accurately specify a ducting system.
Here in the States among contractors, the most common method for duct sizing in residential is the "friction loss per 100 ft." method wherein we calculate the total equivalent length for the longest runs (both supply and return) and size everything based on getting the appropriate amount of air to these runs and balancing the rest with dampers.
Really wish there was an instructional video on this process (or even the equal friction method) in Imperial units out in RUclips.
Thanks for providing such fantastic resources for the industry.
Look up the "ACGIH Industrial Ventilation" manual. You can download the 23rd edition for free on google. It has step by step examples.
great video man as always
and congrats for 100k subs.
Great video! Very similar to how I learned in Applied Fluid Mechanics class!
Another good thing to mind when sizing ducts is the aspect ratio. Ashrae allows us to size on 1:4 basis while CIBSE mentions to size at 1:3.
*ASHRAE
Thank you, for giving great and more easily understandable video
thank you for this video!!! it's very helpful!
Bro I wish I saw this a few years ago when I started as an hvac engineer. You described something that took me months to get the full picture from the lax training at my company.
Helpful and to the point explanation , thumbs up!
great video..really helpful.thanks engineeringmindset.
Great video. Really well explained!
Very informatory. I liked this a lot.
Helped me in my project. Great work!!
Excellent One. Thank you for your effort.
As an engineer, this has help me a lot. Thank you so much for teaching and making useful video like this. Dont stop!
I got my Ac system installation almost a year ago, it smells very bad and when I turn it on it smells like dump wet bathroom. In order to get it to stop smelling I have to get the temperature down to 24, but then it's too cold😢 does anyone know if they have done for me a cowboy job, as I have spent a lot of money
@@victory6904 24 degree fahrenheit? Or Celsius. Either way you could have someone come potentially clean it, install uv lights or some sort of duct cleaning system. It sounds like it might be mildew caused by not properly insulated duct so it could be sweating and building up water that's smells gross. Could be improper drainage. Hard to diagnose something on the Internet just get a professional to look at it
Just another very good simple method. Thank you
Very informative. I want to try doing HVAC at my home by myself. Thanks for the video.
Intro sounds chiller 😍
Great video !Thank you so much , greatting from Việt Nam!
Great video, it's important to also note that's another driving factor for the mass flow rate is the fresh Air supply which is higher than your cooling or heating loads would override your video size
Agreed. This is where hydronics are strong - separating the ventilation needs from the load needs.
So much help in my project rn. Thanks bro.
Nice and clear video, well done.
Do you have any videos on how to calculate proper condenser and evaporater size/capacity in relation to compressor size/capacity on custom AC units ?
If not please consider making one.
Thanks
Great video..... Thank you so much
Amazing videos seriously.
great video which helps me a lot.
You’re amazing fam.
I love it, thanks!!
Great video this, can you also do a video on "calculating the cooling and heating loads using psychrometric charts" for HVAC systems? Really appreciate it if you can
refer to ashrae brother, so much easy to follow when you have ashre guidelines
Amazing video, thank you. I noticed in the video (14.39) you are inputting the data into the interpellation website. that you input in Q11 value 0.14. Should it had been 0.15? (LOL) Its just me and no big deal. It kept me on my toes...so very helpful on your part. Love the videos.....THANK YOU
Thank you so much for making this video. Very helpful.
Wow that’s like our HVAC course lectures❤
Great video!!!
Thankyou so much for this sir
great video, how about exhaust ventilation systems which is the opposite?
Thank you for good detail’s of informations going keeping
Nice video! Grill style and size also effect static pressure but that's probably part of a different video
Thanks! You are awesome. 👍
Great video.
That was great, thank you!
Off course we enjoy it .
Sure it helps us .
Thank you, genius .
Mantaps Good! Love This channel!
i love this video, thanks
As someone who has been doin HVAC design for a while, this is very helpful if you’re trying to understand the theory and calculations for the design. But in the real world, no one is going to build ductwork like yours because everyone is cheap and prefers round taps and tee junctions.
Are you interested in designing HVAC for a house I’m building? We’re planning on installing so I can’t find anyone who will just design it
THANK YOU AND KEEP THE GOOD WORK.
Do you have a video that when you have a rectangular ducting instead of round ducting?
Amazing video btw. thanks!
Just want to say, this video fixed my exam project for HVAC
what is your project?
Love from India ❤
Very helpful
Thanks for this video
Awesome explanation. Really useful!!
Do you have more videos on ventilation duck sizing as mentioned in this videos?
Yes have a look at out channel ruclips.net/channel/UCk0fGHsCEzGig-rSzkfCjMwvideos
Great video!! Thanks for sharing!!
One question: What about split systems? How can I size the ductwork? is it necessary?
New subscriber here, great video
Good work .
This is so freakin helpful
Hi,
Please how we calculate the dynamic loss for damper, for example motorised damper as a fitting?
Thanks
dude, that's very helpful .. thank you so much :) !
Thank You
Hi @theengineeringmindset
From where i can download the duct pressure loss chart ? and tee and fittings chart ? can you help ? i couldnt find it in your description below.
great job
excellent video,,,
You mention about heating and cooling load calculation on 1:15..have you already done the seperate video?
Thanks for this video....
Really good
Any plans of making a tutorial on how to read complex ductwork drawings?
Thank you
thank so much for video,its very helpful, de argentina muchas gracias
Hi there Engineering Mindset! Your videos are all informative, do you have one for sizing of HVAC supply and return air grille? Thanks!
THANK YOU
U so much good and talent never giveup go ahead 😍😍🤗🤗 but this video so much fast ...
Great video this can you make video on DX UNIT
Thanks
Very good
god damn i love your content, thanks a lot
Hi in this video u mentioned about another video of how to calculate heating and cooling load. Is there a link? thnks
Great video this
Thanks for the video. Which software is best for industrial ventilation duct designing ? Most of the ducting part is round.
how did you get velocity 5 m/s on the duct A, you didnt show it in the video, can somebody please axplaine?
amazing..
Hi help please
In case we have an hrv or an erv the duct of return air coming out from wc where shall we connect it? Would we mix it with fresh air?
Good day Sir. May I asked what maybe the factors I should consider in computing cooling load by if I am going to use manual calculation?
My problem is that when using danfoss coolerselector2 (software) I am getting a different values which has a very big discrepancy.
Ok this is what I want to get into. Sounds really interesting. I currently have this oversized fan in my house. The duct looks waay too small and the noise is the biggest problem. I was thinking to increase the size of the duct to lower the noise but will try first to use these calculations to see if it would make any losses in terms of cooling. Do you (or anybody here in comment section) have any advices on how to lower the noise without loosing too much on cooling?
Thank you in advance.
Do you do system designs for residential
Great video, I just have one question. When determining the mass flow rate, in the image it says to use delta T in terms of Kelvin but I believe you used your 8 degrees Celsius to get the mass flow rate for each room? Should we convert that into Kelvin?
i actually use simscale what a peace of software
can you also do a comparison of using one centralized hvac system versus mini-split units for the same size of a house having four bedroom and two floors. tks.
Loved the video - can you make one with Imperial measurements for your slower US brethren? :) You can say - oh just use feet vs... However if the video was done all the way through with measurements we'd likely use, it would be easier to follow.
Hi,
Amazing video, really has helped me complete an assignment that I had no information on how to complete. However I'm still going to fail because you didn't calculate grilles. Also you stated that you would include the fitting tables you used in the video in the description, but it's not there and I have spend the last two hours looking for a god for saken fitting tables to no avail.
😕? I left 3 links for the exact books you need with all the information in, in the video description. You're welcome.
@@EngineeringMindset Aha! I see, in that case, thank you. Your videos are just so well put together and beautifully explained, you honestly really helped me out. Thank you for replying.
What velocity should I use in the pressure loss formula if fitting is a straight rectangular diverging duct?
Wonder how can we find velocity of air in duct to use for finding diameter of duct in chart ?
duct supplier has this table.
Sohrab:
Ques 4:-
Coefficient of pressure values of fittings like
Reducer=0.25
Elbow=0.27
It will varies or fixed according to CFM
Ques 1:-
During calculating static pressure only critical path will be taken or not ?
Ques 3:-
In formula
(F×L)/100
F= friction factor or friction head loss
Ques 2:-
we will calculate all the VCD OR only critical path?
You do all this, provide your quotation and you are too expensive. Then a cowboy contractor comes in (who calls himself an engineer), oversizes the ducts, undersizes the fan, uses wrong grade filters and charges far less.
Then you are asked to go and see why the system does not perform, you make a list and the customer prefers not to do anything after all when they see the bill.
At the end we are out of pocket for the time spent sizing a proper system, twice, and we end up not getting the job. At the end of the financial year we struggle to pay our subscription to the Engineering Council.
So offer them a different business model. Give them a simple 1 page of what seems wrong and if they want the full answer then they need to pay for a review and offer to deduct this from the final quote if they choose to use you. Estimate the financial and energy savings from the improvement as well as how it will improve their work/living conditions.
The Engineering Mindset You said the magic word, energy saving.
I had customers prefering to go with normal AC motor fans because they were cheaper to buy than EC motor fans that would pay for themselves in a couple of years and start providing true money saving. Anyway, it is a big discussion this one.
Great video by the way, as always.
this business model idea is what we do in the cloud computing world. an architect gives them a basic idea of the price, and work required based on a basic conversation with them, tehn an engineer gives them the actual plan, and hours breakdown, based on a deep dive discovery. a lot of times, we are on or under cost, but that comes with experience. you have to do the calculations to 'pay your dues' as it were until you reach architect level, where you can spitball an estimate, and be pretty close.
Manolis Theofilos I do the calculations after I get a deposit.
We usually have a contract drawn up before we begin work. Either fee or hourly based.
Thanks for the video, very helpful! I have a question, while calculating the pressure drop in tees (14:45) the pressure loss formula was used with the outlet velocity. However, in ASHRAE fundamentals book 2001, they state that for junctions, the pressure drop is referenced to the dynamic pressure drop for the common section (i.e., main section upstream). Therefore, for junctions, as far as I understand, the inlet velocity has to be used to calculate the pressure drop from the junction either the branched part or the straight part.. could you please enlighten me on this?
what's the answer to this question?
whats the link to the fitting tables?
Can you do a video on the Velocity Reduction Method?
Fantastic and excellently explained. Does anybody know of any online calculation software or any programme that can help with sizing ducted airconditioning units and FCU's with the correct size ductwork?
Plz make a video of external static pressure calculation explain in detail (straight, elbow, offset,shoe or collar piece ,round to Square or rectangular duct ,all type of fittings like VCD ,FFD ,MVCD,MFD etc...)
Hi,
Another great video. Thank you!
I have a question. For an equal pressure drop per meter in all of the ducts you used non-commercial sizes like 0.24 m or 0.39 m (at least in Portugal they don't exist). Actually, you will have to use the commercial existing sizes if this would be a real project, right? In that case, it is really possible to maintain an equal pressure drop per meter in all ducts?? Or actually you will never have this in real life, it is just a theoretical method and you just try to find the sizes that allows you to have the most similar pressure drop per meter as possible (per example, between 0.6 to 0.8 Pa/m)?
Sorry if it is a stupid question.
Thanks in advance.
Best regards
Duct can be made to any custom size but it will cost more, to save money and use standard size only then adjustments need to be made to the calculations and reiterate