Ductwork sizing, calculation and design for efficiency - HVAC Basics + full worked example
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- Опубликовано: 20 ноя 2024
- 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?
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.
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.
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
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.
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
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!
I’m the same here just helped commission a job and was curious how they came up with air flow rates on the drawing and it’s pretty insane how much goes into it just for us to come along and make they’re job more fun 😂
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
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?
Just want to say, this video fixed my exam project for HVAC
what is your project?
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.
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
Wow that’s like our HVAC course lectures❤
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
I have two comments :
First:
pressure loss for Tee G-I (bend) is less than G-J (straight) How ?
Second:
we need link for the duct pressure loss chart
thank you so much
Great video about Duct Design
Great video !Thank you so much , greatting from Việt Nam!
Love from India ❤
Great video! Very similar to how I learned in Applied Fluid Mechanics class!
Just another very good simple method. Thank you
Fitting loss in G-I direction should not be 0.36. I guess, 0.36 is the Fitting Coefficient. So, the fitting loss in G-I direction should be 2.65. Please correct me if I'm wrong. Thank you.
watch How *AIR HANDLING UNITS* work here: ruclips.net/video/KCiv8IAUkh8/видео.html
So much help in my project rn. Thanks bro.
THANK YOU AND KEEP THE GOOD WORK.
0:47
1:15
1:46
2:55
6:13
8:52
9:55
10:30
12:44
12:55
13:32
14:17
15:06
15:55
16:43
Very informative. I want to try doing HVAC at my home by myself. Thanks for the video.
Hi, nice video. please note that there is a little mistake in calculation.
1.026 * 8 = 8.208 kj/kg but it is calculated 8.028 kj/kg.
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?
Thank you for good detail’s of informations going keeping
Helped me in my project. Great work!!
Very informatory. I liked this a lot.
great video, how about exhaust ventilation systems which is the opposite?
Any plans of making a tutorial on how to read complex ductwork drawings?
very nice sir, HVAC&R ENGINEER from pakistan
Glad you enjoyed it
Thankyou so much for this sir
Excellent One. Thank you for your effort.
i actually use simscale what a peace of software
Hi
At 15:42 you calculated the C0 from the table and interbolation, and you forgot to calculate the P loss in the bend direction using the formula (P=C0*density*velocity^2/2)
,you have put it into the table directly
.
Plz notice that and if i'm Wrong tell us the Right plz.
Hmmm i notice that when u do consistency of units it come out like Kg/m.s2. idk maybe im wrong?
ايش الصحيح ؟
That was great, thank you!
You mention about heating and cooling load calculation on 1:15..have you already done the seperate video?
Great video!! Thanks for sharing!!
One question: What about split systems? How can I size the ductwork? is it necessary?
Air volume in HVAC is by sensible heat, without sensible heat. Duct is only GI gage 22 from sizing.
great video man as always
and congrats for 100k subs.
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.
I don't know a darn thing about HVAC but I do know maths. Towards the end, you discuss losses and using baffles to compensate. I don't see anything about the origination fan, it's CFM, and any filters throughout this system.
I would like to build out my own system originating from a window and a plenum box, where a blower is first, then a MERV or HEPA filter, followed with 4 UVC lamps. This system will only supply two rooms with a "junction" or collector as I call it, in-between both rooms (hallway) that is again supplied with a MERV or HEPA filter and UVC lamps out to the second room. Second room is much larger than the first originating room. Two exhausts, one inside origination window above and other through window of second room.
Mantaps Good! Love This channel!
Thank you, for giving great and more easily understandable video
Nice video! Grill style and size also effect static pressure but that's probably part of a different video
This is a great educational video, but I have been doing HVAC design for commercial building for few years and usually you just use 0.1 in wc (water column) of static loss to size supply air ducts. For return air ducts, it’s 0.08 in wc.
If you do all this detailed analysis, you will never be able to complete large projects on time or schedule and your firm will loose clients.
I have a question. While you design hvac systems for your clients how much of the hand calculations do you have to do. or do you just work with the revit software?.
Helpful and to the point explanation , thumbs up!
Thanks for this video
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.
thank you for this video!!! it's very helpful!
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
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...)
Intro sounds chiller 😍
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.
Great video, For the Tee 'H'at 15:45, is it not the bend coeff' 0.3645 taken from table using vel and area ratios, then using formula to find out the pr loss ?, It says straight from table, the coef 0.3645 as pr loss in Pa.
Pls clarify. Thanks.
New subscriber here, great video
great video..really helpful.thanks engineeringmindset.
Really good
Out of curiosity, do you only need to bring fresh, conditioned air into the rooms? Is it not necessary to also suck out the stale air using a separate duct system?
Amazing videos seriously.
great video which helps me a lot.
In calculating the pressure loss in the Tee Fitting, why do you only apply the dynamic loss formula in the straight direction and not in the bend too? For the bend you've only used the co-efficient of 0.3645 (15:45) and not used this in the dynamic loss equation, like you did after getting the co-efficient of 0.143 in the straight section (14:45).
was that a mistake ? or its how it done ?
I noticed that as well. It looks like an honest mistake.
Great video this
Thanks for the video. Which software is best for industrial ventilation duct designing ? Most of the ducting part is round.
I have never seen this method of calculating duct. It looks like a quick and simple method instead of calculating the Liters per second or CFM.
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.
Great video.
god damn i love your content, thanks a lot
Very good
Can you do a video on the Velocity Reduction Method?
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..... Thank you so much
Very helpful
Can you do another difficult example with grille/coil etc.?
Do you have a video that when you have a rectangular ducting instead of round ducting?
Amazing video btw. thanks!
Can you please upload full hvac system
Thank you so much for making this video. Very helpful.
Mulțumim!
Thank you!
Great video. Really well explained!
Thanks! You are awesome. 👍
Great video!!!
This is so freakin helpful
You’re amazing fam.
Good work .
Thanks for this video....
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.
I think there is something wrong with the computation for Pressure loss in Tee-Branch. Please Correct me if Im wrong but i think you used the coefficent as the pressure loss.
great job
Hi Paul. What a brilliant video thank you very much!!! Can you put a link to the Duct Pressure Loss Chart you used please?
Link is in description, it's for the cibse book. I don't have the copyright for the chart so I can't share the chart unfortunately.
pls can you do the cooling and heating load calculation
Can you plz make a video of flat oval or elliptical duct sizing ,it is helpful for us
Hey bro, got any idea of how to find the area of rectangular one?
I love it, thanks!!
Thanks
excellent video,,,
Off course we enjoy it .
Sure it helps us .
Thank you, genius .
Thank You
Was the cooling load provided in the beginning of the video considered sensible load? Because "m=Q*cp*dt" refers Q to sensible load
@Mech Tuber not that great, you'll be able to have a decent life but nothing great. considering the effort you put into your studies, money spent, and the hours you'll be working, I'd say drop out and do something like medicine if you won't faint at sight of blood, or be a dentist/eye doctor. Much more lucrative.