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Ductwork sizing, calculation and design for efficiency - HVAC Basics + full worked example 

The Engineering Mindset
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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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hvac hacks hvac training videos technician sizing
#HVAC #refrigeration #engineering

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24 июн 2018

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Комментарии : 340   
@EngineeringMindset
@EngineeringMindset 5 лет назад
⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕ PayPal: www.paypal.me/TheEngineerinMindset
@JudgeFredd
@JudgeFredd 4 года назад
Done ;-)
@ralphcalamba5367
@ralphcalamba5367 4 года назад
comment the photo of the Duct Pressure Loss Chart Please :(
@hemanta3758
@hemanta3758 2 года назад
@@JudgeFredd so 33
@grantramsay9956
@grantramsay9956 6 месяцев назад
Could you do one about fabric ductwork?
@mfsperring
@mfsperring 5 лет назад
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.
@deetailing
@deetailing Год назад
Yes I suffered many a nose bleed during this video
@Rannilas
@Rannilas 2 года назад
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.
@aaronpomeroy2579
@aaronpomeroy2579 3 месяца назад
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.
@EngineeringMindset
@EngineeringMindset 5 лет назад
watch How *AIR HANDLING UNITS* work here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-KCiv8IAUkh8.html
@jakeedgington
@jakeedgington 3 года назад
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!
@mohdadnan1888
@mohdadnan1888 6 лет назад
great video man as always and congrats for 100k subs.
@mydrouno
@mydrouno 3 года назад
Great video! Very similar to how I learned in Applied Fluid Mechanics class!
@rolandovillamiro1105
@rolandovillamiro1105 5 лет назад
thank you for this video!!! it's very helpful!
@jasonanderson7343
@jasonanderson7343 6 лет назад
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.
@MetrologyEngineer
@MetrologyEngineer 3 года назад
*ASHRAE
@ahmadqadir94
@ahmadqadir94 4 года назад
Thank you, for giving great and more easily understandable video
@YasinYTK07
@YasinYTK07 6 лет назад
Intro sounds chiller 😍
@0mfgitzramzi
@0mfgitzramzi 5 лет назад
You’re amazing fam.
@psmeyanburabighchapter3889
@psmeyanburabighchapter3889 5 лет назад
great video..really helpful.thanks engineeringmindset.
@tanmaysharma5461
@tanmaysharma5461 5 лет назад
Helpful and to the point explanation , thumbs up!
@syedsheheryarumer5186
@syedsheheryarumer5186 5 лет назад
Great video. Really well explained!
@Johnetillo
@Johnetillo 6 лет назад
I love it, thanks!!
@alekul2020
@alekul2020 2 года назад
Just another very good simple method. Thank you
@mattllamas571
@mattllamas571 4 года назад
Very informatory. I liked this a lot.
@traninhtoan7203
@traninhtoan7203 3 года назад
Great video !Thank you so much , greatting from Việt Nam!
@byronjones3579
@byronjones3579 5 лет назад
Amazing videos seriously.
@hridaymaheshwari4209
@hridaymaheshwari4209 3 года назад
Helped me in my project. Great work!!
@engineeringmaniac9696
@engineeringmaniac9696 3 года назад
Excellent One. Thank you for your effort.
@rajkumarnirlesh7496
@rajkumarnirlesh7496 2 года назад
Very informative. I want to try doing HVAC at my home by myself. Thanks for the video.
@michaelorlain4262
@michaelorlain4262 3 года назад
So much help in my project rn. Thanks bro.
@daniel1c
@daniel1c 5 лет назад
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
@Heatherder
@Heatherder 3 года назад
Agreed. This is where hydronics are strong - separating the ventilation needs from the load needs.
@hwpraneethb
@hwpraneethb 6 лет назад
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
@beardedpinoy8645
@beardedpinoy8645 Год назад
refer to ashrae brother, so much easy to follow when you have ashre guidelines
@arifmohamed8610
@arifmohamed8610 6 лет назад
Great video..... Thank you so much
@Oldthesis
@Oldthesis 5 лет назад
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 RU-vid. Thanks for providing such fantastic resources for the industry.
@Ryan-dj5ku
@Ryan-dj5ku 3 года назад
Look up the "ACGIH Industrial Ventilation" manual. You can download the 23rd edition for free on google. It has step by step examples.
@kwongchoming4977
@kwongchoming4977 5 лет назад
great video which helps me a lot.
@kimjitchu3799
@kimjitchu3799 7 месяцев назад
As an engineer, this has help me a lot. Thank you so much for teaching and making useful video like this. Dont stop!
@victory6904
@victory6904 7 месяцев назад
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
@combatwa4les253
@combatwa4les253 5 месяцев назад
​@@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
@user-sm9hh9hz8j
@user-sm9hh9hz8j 6 лет назад
Off course we enjoy it . Sure it helps us . Thank you, genius .
@ben3mar
@ben3mar 4 года назад
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
@hersonherrera5218
@hersonherrera5218 5 лет назад
Thanks! You are awesome. 👍
@alexeirussoreo7005
@alexeirussoreo7005 5 лет назад
Thank you so much for making this video. Very helpful.
@jorgebeatorodriguez223
@jorgebeatorodriguez223 6 лет назад
Great video!!!
@nerguibayka2004
@nerguibayka2004 5 лет назад
i love this video, thanks
@ddeonf8296
@ddeonf8296 3 года назад
Mantaps Good! Love This channel!
@syedumerahmed9514
@syedumerahmed9514 11 месяцев назад
Wow that’s like our HVAC course lectures❤
@kaybees7484
@kaybees7484 3 года назад
This is so freakin helpful
@keithhogan5770
@keithhogan5770 6 лет назад
Great video.
@pepecebolla69
@pepecebolla69 Год назад
That was great, thank you!
@asadahmadkhan1054
@asadahmadkhan1054 2 месяца назад
Love from India ❤
@zemhrethagos2575
@zemhrethagos2575 5 месяцев назад
THANK YOU AND KEEP THE GOOD WORK.
@potentialhvac6074
@potentialhvac6074 2 года назад
Nice video! Grill style and size also effect static pressure but that's probably part of a different video
@CG0820
@CG0820 5 лет назад
Very helpful
@abderrahmaneelfadili1342
@abderrahmaneelfadili1342 5 лет назад
dude, that's very helpful .. thank you so much :) !
@rdnclipz
@rdnclipz 5 лет назад
Thank You
@nealrosales430
@nealrosales430 4 года назад
Do you have a video that when you have a rectangular ducting instead of round ducting? Amazing video btw. thanks!
@user-tr9to2bh6x
@user-tr9to2bh6x 9 месяцев назад
Thank you for good detail’s of informations going keeping
@hassanas15
@hassanas15 2 года назад
Just want to say, this video fixed my exam project for HVAC
@salmankhanmohmand9174
@salmankhanmohmand9174 Месяц назад
what is your project?
@mikea7174
@mikea7174 3 года назад
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
@gelmiricardo8229
@gelmiricardo8229 5 лет назад
thank so much for video,its very helpful, de argentina muchas gracias
@tnt_castillejos5892
@tnt_castillejos5892 3 года назад
Thanks for this video
@liangchayking
@liangchayking 4 года назад
great video, how about exhaust ventilation systems which is the opposite?
@scoonize
@scoonize 5 лет назад
THANK YOU
@teoscott1
@teoscott1 5 лет назад
Awesome explanation. Really useful!! Do you have more videos on ventilation duck sizing as mentioned in this videos?
@EngineeringMindset
@EngineeringMindset 5 лет назад
Yes have a look at out channel ru-vid.com/show-UCk0fGHsCEzGig-rSzkfCjMwvideos
@niceguy4801
@niceguy4801 7 месяцев назад
Thankyou so much for this sir
@roderickaguirre263
@roderickaguirre263 4 года назад
Thanks for this video....
@igor.castro
@igor.castro 3 года назад
Great video!! Thanks for sharing!! One question: What about split systems? How can I size the ductwork? is it necessary?
@ramzramz27
@ramzramz27 3 года назад
Hi there Engineering Mindset! Your videos are all informative, do you have one for sizing of HVAC supply and return air grille? Thanks!
@nzkworld4706
@nzkworld4706 5 лет назад
great job
@mahmoudmousa6901
@mahmoudmousa6901 4 года назад
U so much good and talent never giveup go ahead 😍😍🤗🤗 but this video so much fast ...
@khaleejkha4026
@khaleejkha4026 6 лет назад
Thanks
@esmathamedmohamed9481
@esmathamedmohamed9481 5 лет назад
excellent video,,,
@user-qv2vh4bw4z
@user-qv2vh4bw4z 4 года назад
Good work .
@etfc944
@etfc944 5 лет назад
Great video this can you make video on DX UNIT
@shreddedskull666
@shreddedskull666 3 года назад
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.
@taylorpikor-zs3ym
@taylorpikor-zs3ym Год назад
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
@robferdinand3158
@robferdinand3158 4 года назад
New subscriber here, great video
@rovindosejahtera5515
@rovindosejahtera5515 5 лет назад
amazing..
@TheManolis1984
@TheManolis1984 6 лет назад
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.
@EngineeringMindset
@EngineeringMindset 6 лет назад
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.
@TheManolis1984
@TheManolis1984 6 лет назад
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.
@hassenfepher
@hassenfepher 5 лет назад
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.
@mushroomcastle5184
@mushroomcastle5184 5 лет назад
Manolis Theofilos I do the calculations after I get a deposit.
@Phil198431
@Phil198431 5 лет назад
We usually have a contract drawn up before we begin work. Either fee or hourly based.
@aliyusuf7713
@aliyusuf7713 3 года назад
Thank you
@todaslasweasposibles
@todaslasweasposibles 2 года назад
god damn i love your content, thanks a lot
@jakovbilic4556
@jakovbilic4556 2 года назад
Really good
@moviesjean23
@moviesjean23 4 года назад
i actually use simscale what a peace of software
@calvinwijaya2553
@calvinwijaya2553 3 года назад
Great video this
@kuangalenga154
@kuangalenga154 5 лет назад
You mention about heating and cooling load calculation on 1:15..have you already done the seperate video?
@mohammedansarahmed2393
@mohammedansarahmed2393 5 лет назад
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.
@alensukaj4226
@alensukaj4226 3 года назад
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.
@edunewton1386
@edunewton1386 4 года назад
Hi, Please how we calculate the dynamic loss for damper, for example motorised damper as a fitting? Thanks
@l.crossjr
@l.crossjr 3 года назад
Any plans of making a tutorial on how to read complex ductwork drawings?
@reliableengineeringsolutio8890
@reliableengineeringsolutio8890 2 года назад
Very good
@teoscott1
@teoscott1 5 лет назад
Hi in this video u mentioned about another video of how to calculate heating and cooling load. Is there a link? thnks
@MariusSoflete
@MariusSoflete 5 месяцев назад
Mulțumim!
@EngineeringMindset
@EngineeringMindset 5 месяцев назад
Thank you!
@waheedbashirkhokharkhokhar4485
very nice sir, HVAC&R ENGINEER from pakistan
@EngineeringMindset
@EngineeringMindset 6 лет назад
Glad you enjoyed it
@boedillard8807
@boedillard8807 2 года назад
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.
@PAVANPAVAN-hl8uo
@PAVANPAVAN-hl8uo 4 месяца назад
Thanks for the video. Which software is best for industrial ventilation duct designing ? Most of the ducting part is round.
@bluemoublue4166
@bluemoublue4166 3 года назад
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?
@jungapo2
@jungapo2 3 года назад
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.
@krantikumar7929
@krantikumar7929 4 года назад
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...)
@gagekirkwood4224
@gagekirkwood4224 Месяц назад
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?
@hindricksaironariola7056
@hindricksaironariola7056 Год назад
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.
@leonciogarcia9989
@leonciogarcia9989 4 года назад
Air volume in HVAC is by sensible heat, without sensible heat. Duct is only GI gage 22 from sizing.
@tiagoferreira6713
@tiagoferreira6713 6 лет назад
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
@EngineeringMindset
@EngineeringMindset 6 лет назад
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
@brianpimental2948
@brianpimental2948 5 лет назад
Do you do system designs for residential
@miguelaverilla512
@miguelaverilla512 2 года назад
What velocity should I use in the pressure loss formula if fitting is a straight rectangular diverging duct?
@saddamjaber4551
@saddamjaber4551 4 года назад
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
@moviesadda9521
@moviesadda9521 3 года назад
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?
@IceyJunior
@IceyJunior 5 лет назад
Hi Paul, the duct loss graphs you showed is it plotted from the pressure loss equation for fully developed flows (also called the Darcy-Weisbach equation)? Also, in this case gravitational effects are not affect the air in the duct as the duct is horizontal. What if some part of the duct is vertical? If so will this change the way of calculation as shown in this video? Also, when using this equal friction method, are you assuming that the pressure loss per meter length is constant? Also, will you be showing the other 2 method as mentioned in the early part of the video?
@EngineeringMindset
@EngineeringMindset 5 лет назад
Hello I'm actually not sure as the charts are from manufacturers and industry bodies, you would need to check with them. These are standard design guides for horizontal, vertical needs more calcs. I might cover the others it depends how well this video does and of there's a lot of interest.
@IceyJunior
@IceyJunior 5 лет назад
@@EngineeringMindset I dunno about others, but I certainly do.
@rajtiwari5526
@rajtiwari5526 5 лет назад
dear sir can u clear one thing when u were calculating for bend and other dynamic loss which is actually loss due to momentum change or velocity pressure loss means minor loss can u clear weather this is the only loss bend will generate or do we have to calculate friction loss in bend length separately which is considerd as major loss
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