Ductwork sizing, calculation and design for efficiency

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

Рет қаралды 974,031

6 жыл бұрын

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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Пікірлер: 347

@EngineeringMindset 6 жыл бұрын

⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕ PayPal: www.paypal.me/TheEngineerinMindset

@JudgeFredd 4 жыл бұрын

Done ;-)

@ralphcalamba5367 4 жыл бұрын

comment the photo of the Duct Pressure Loss Chart Please :(

@hemanta3758 2 жыл бұрын

@@JudgeFredd so 33

@grantramsay9956 7 ай бұрын

Could you do one about fabric ductwork?

@Rannilas 2 жыл бұрын

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.

@mfsperring 5 жыл бұрын

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 Жыл бұрын

Yes I suffered many a nose bleed during this video

@aaronpomeroy2579 4 ай бұрын

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.

@jakeedgington 3 жыл бұрын

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!

@jasonanderson7343 6 жыл бұрын

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 3 жыл бұрын

*ASHRAE

@mydrouno 3 жыл бұрын

Great video! Very similar to how I learned in Applied Fluid Mechanics class!

@ahmadqadir94 4 жыл бұрын

Thank you, for giving great and more easily understandable video

@rolandovillamiro1105 5 жыл бұрын

thank you for this video!!! it's very helpful!

@mohdadnan1888 6 жыл бұрын

great video man as always and congrats for 100k subs.

@syedsheheryarumer5186 5 жыл бұрын

Great video. Really well explained!

@psmeyanburabighchapter3889 5 жыл бұрын

great video..really helpful.thanks engineeringmindset.

@tanmaysharma5461 5 жыл бұрын

Helpful and to the point explanation , thumbs up!

@daniel1c 5 жыл бұрын

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 3 жыл бұрын

Agreed. This is where hydronics are strong - separating the ventilation needs from the load needs.

@Johnetillo 6 жыл бұрын

I love it, thanks!!

@YasinYTK07 6 жыл бұрын

Intro sounds chiller 😍

@0mfgitzramzi 5 жыл бұрын

You’re amazing fam.

@Oldthesis 5 жыл бұрын

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 KZfaq. Thanks for providing such fantastic resources for the industry.

@Ryan-dj5ku 3 жыл бұрын

Look up the "ACGIH Industrial Ventilation" manual. You can download the 23rd edition for free on google. It has step by step examples.

@hwpraneethb 6 жыл бұрын

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 Жыл бұрын

refer to ashrae brother, so much easy to follow when you have ashre guidelines

@kimjitchu3799 8 ай бұрын

As an engineer, this has help me a lot. Thank you so much for teaching and making useful video like this. Dont stop!

@victory6904 8 ай бұрын

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 6 ай бұрын

@@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

@byronjones3579 5 жыл бұрын

Amazing videos seriously.

@mattllamas571 4 жыл бұрын

Very informatory. I liked this a lot.

@engineeringmaniac9696 4 жыл бұрын

Excellent One. Thank you for your effort.

@hridaymaheshwari4209 3 жыл бұрын

Helped me in my project. Great work!!

@arifmohamed8610 6 жыл бұрын

Great video..... Thank you so much

@rajkumarnirlesh7496 2 жыл бұрын

Very informative. I want to try doing HVAC at my home by myself. Thanks for the video.

@alekul2020 2 жыл бұрын

Just another very good simple method. Thank you

@jorgebeatorodriguez223 6 жыл бұрын

Great video!!!

@kwongchoming4977 5 жыл бұрын

great video which helps me a lot.

@ben3mar 4 жыл бұрын

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

@nerguibayka2004 5 жыл бұрын

i love this video, thanks

@hersonherrera5218 5 жыл бұрын

Thanks! You are awesome. 👍

@alexeirussoreo7005 5 жыл бұрын

Thank you so much for making this video. Very helpful.

@user-sm9hh9hz8j 6 жыл бұрын

Off course we enjoy it . Sure it helps us . Thank you, genius .

@michaelorlain4262 3 жыл бұрын

So much help in my project rn. Thanks bro.

@keithhogan5770 6 жыл бұрын

Great video.

@traninhtoan7203 3 жыл бұрын

Great video !Thank you so much , greatting from Việt Nam!

@mikea7174 3 жыл бұрын

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

@shreddedskull666 3 жыл бұрын

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 Жыл бұрын

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

@EngineeringMindset 5 жыл бұрын

watch How *AIR HANDLING UNITS* work here: kzfaq.info/get/bejne/gamZqZt6prvPmGw.html

@hassanas15 2 жыл бұрын

Just want to say, this video fixed my exam project for HVAC

@salmankhanmohmand9174 2 ай бұрын

what is your project?

@kaybees7484 4 жыл бұрын

This is so freakin helpful

@potentialhvac6074 2 жыл бұрын

Nice video! Grill style and size also effect static pressure but that's probably part of a different video

@CG0820 5 жыл бұрын

Very helpful

@pepecebolla69 2 жыл бұрын

That was great, thank you!

@abderrahmaneelfadili1342 5 жыл бұрын

dude, that's very helpful .. thank you so much :) !

@syedumerahmed9514 Жыл бұрын

Wow that’s like our HVAC course lectures❤

@zemhrethagos2575 6 ай бұрын

THANK YOU AND KEEP THE GOOD WORK.

@teoscott1 5 жыл бұрын

Awesome explanation. Really useful!! Do you have more videos on ventilation duck sizing as mentioned in this videos?

@EngineeringMindset 5 жыл бұрын

Yes have a look at out channel kzfaq.info/love/k0fGHsCEzGig-rSzkfCjMwvideos

@ddeonf8296 3 жыл бұрын

Mantaps Good! Love This channel!

@rdnclipz 5 жыл бұрын

Thank You

@gelmiricardo8229 5 жыл бұрын

thank so much for video,its very helpful, de argentina muchas gracias

@nzkworld4706 5 жыл бұрын

great job

@esmathamedmohamed9481 5 жыл бұрын

excellent video,,,

@user-qv2vh4bw4z 4 жыл бұрын

Good work .

@niceguy4801 8 ай бұрын

Thankyou so much for this sir

@tnt_castillejos5892 3 жыл бұрын

Thanks for this video

@scoonize 5 жыл бұрын

THANK YOU

@nealrosales430 4 жыл бұрын

Do you have a video that when you have a rectangular ducting instead of round ducting? Amazing video btw. thanks!

@user-tr9to2bh6x 10 ай бұрын

Thank you for good detail’s of informations going keeping

@roderickaguirre263 4 жыл бұрын

Thanks for this video....

@robferdinand3158 4 жыл бұрын

New subscriber here, great video

@mahmoudmousa6901 5 жыл бұрын

U so much good and talent never giveup go ahead 😍😍🤗🤗 but this video so much fast ...

@asadahmadkhan1054 4 ай бұрын

Love from India ❤

@rovindosejahtera5515 5 жыл бұрын

amazing..

@igor.castro 3 жыл бұрын

Great video!! Thanks for sharing!! One question: What about split systems? How can I size the ductwork? is it necessary?

@khaleejkha4026 6 жыл бұрын

Thanks

@liangchayking 4 жыл бұрын

great video, how about exhaust ventilation systems which is the opposite?

@moviesjean23 4 жыл бұрын

i actually use simscale what a peace of software

@jakovbilic4556 3 жыл бұрын

Really good

@etfc944 5 жыл бұрын

Great video this can you make video on DX UNIT

@calvinwijaya2553 3 жыл бұрын

Great video this

@ramzramz27 3 жыл бұрын

Hi there Engineering Mindset! Your videos are all informative, do you have one for sizing of HVAC supply and return air grille? Thanks!

@aliyusuf7713 3 жыл бұрын

Thank you

@reliableengineeringsolutio8890 2 жыл бұрын

Very good

@kuangalenga154 5 жыл бұрын

You mention about heating and cooling load calculation on 1:15..have you already done the seperate video?

@mohammedansarahmed2393 5 жыл бұрын

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.

@l.crossjr 3 жыл бұрын

Any plans of making a tutorial on how to read complex ductwork drawings?

@edunewton1386 4 жыл бұрын

Hi, Please how we calculate the dynamic loss for damper, for example motorised damper as a fitting? Thanks

@boedillard8807 2 жыл бұрын

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.

@moviesadda9521 3 жыл бұрын

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?

@waheedbashirkhokharkhokhar4485 6 жыл бұрын

very nice sir, HVAC&R ENGINEER from pakistan

@EngineeringMindset 6 жыл бұрын

Glad you enjoyed it

@danielofoegbu5532 7 күн бұрын

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

@bluemoublue4166 3 жыл бұрын

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?

@alensukaj4226 3 жыл бұрын

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.

@tiagoferreira6713 6 жыл бұрын

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 6 жыл бұрын

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

@todaslasweasposibles 2 жыл бұрын

god damn i love your content, thanks a lot

@hindricksaironariola7056 Жыл бұрын

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.

@TheMlkhk 5 жыл бұрын

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.

@EngineeringMindset 5 жыл бұрын

😕? I left 3 links for the exact books you need with all the information in, in the video description. You're welcome.

@TheMlkhk 5 жыл бұрын

@@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.

@teoscott1 5 жыл бұрын

Hi in this video u mentioned about another video of how to calculate heating and cooling load. Is there a link? thnks

@krantikumar7929 4 жыл бұрын

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...)

@saddamjaber4551 4 жыл бұрын

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

@leonciogarcia9989 4 жыл бұрын

Air volume in HVAC is by sensible heat, without sensible heat. Duct is only GI gage 22 from sizing.

@MariusSoflete 6 ай бұрын

Mulțumim!

@EngineeringMindset 6 ай бұрын

Thank you!

@jungapo2 3 жыл бұрын

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.

@rajtiwari5526 5 жыл бұрын

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

@miguelaverilla512 2 жыл бұрын

What velocity should I use in the pressure loss formula if fitting is a straight rectangular diverging duct?

@tonymarsh9282 2 жыл бұрын

Hi Paul. What a brilliant video thank you very much!!! Can you put a link to the Duct Pressure Loss Chart you used please?

@EngineeringMindset 2 жыл бұрын

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.

@alialmusallam3957 5 жыл бұрын

as a general rule how many watts are needed per meter squared while doing a fast calculation for cooling load? Thank you

@moinudheenmuhammed7514 4 жыл бұрын

According to thump rule 1 TR for 100 sqft , and it will change as per the height

@zakaryakabbara1160 Жыл бұрын

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?

@kimjitchu3799 8 ай бұрын

what's the answer to this question?