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 (https://www.simscale.com/)
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Hi Paul or any other engineer in M&E building engineering line, I have a question to ask you all about changing of duct size. Say a 500 (w) x 400 (h) mm duct, and I wanna change the height of 400 mm to 250 mm. I used the hydraulic diameter equation to calculate for the new width. However, when I compare the answer to the "duct calculator". It doesn't match with my calculation. My calculation shows a new width of 2000 mm whereas the "duct calculator" shows 850 mm. What assumption/mistake or anything other related things did I not take into considerations?
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
+The Engineering Mindset If we work out this way then every building might have different cost. Is there an industry standard? How to understand from customer standpoint if he is not being taken for a ride with the costs?
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?
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.
Hopefully Sims 4 Nerds Expansion Pack comes out soon so build mode requires realistically engineering electrical, water, ducts and gas if you choose gas appliances in homes you build so these videos would be useful! Seriously I actually want that because it would make time spent watching this actually useful and in Rollercoaster Tycoon I hate killing guests. My fun in that game comes from engineering safe and exciting rides with maximum through put and large profit for at least a decade. That is why I always use block brakes on my rollercoasters becasue it is more realistic as real coasters have similar safety systems and it is harder to keep the trains from delaying each other. It is possible to space trains out far enough with block brakes so they only stop in the station. I also wish this channel would show rollercoaster engineering at least with track rides in OpenRCT2. I might actually be helped by that because only recently I got into the OpenRCT2 and improved on my ride designing in cost, space, safety, keeping excitement up while keeping intensity down so I might still learn better ways of ride design from this channel.
ok, its temperature difference. so it doesn't matter if you use C or K there is still a difference of 8 between the hot temperature and cold temperature. arbitrary example: 9*c - 1*c = DeltaT of 8c. and equally 282K - 274K = 8K
Its just the temperature difference you want to design to, regardless of the temperature you'll use
a bit dry for me as i only engineer my house for fun. (computer guy by trade) im sure if i wanted to do all of the calculations, it would be super accurate and helpful. your target audience might be the super dry and calculatey, so that might be just fine. ill watch a few more.
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.
Thank you so much for this helpful video. Can we request a video explaining what pressure drops in ducts and pipe systems mean? I tried searching these online and in textbooks but couldn't understand it. Hopefully, with your teaching ability I may be able to understand the subject. Please reconsider.
Your put work into a pump or fan so that it can create pressure. This pressure is the driving force for the fluid (water or air etc) the pressure always tries to reduce, when there is a an opportunity for pressure to escape to a lower pressure such as through an opening or grille, then the fluid will flow to this. As it flows it hits obstructions and experiences resistance. This wastes the energy and will reduce the pressure as its converted to kinetic energy.
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.
Manolis Theofilos well part of that is having sales people who can actually sell the work properly . Other part is not every customer will pay the money for things to be done properly. I am not doing anything without getting paid . So I have rough estimates of what my ducting systems should cost based on system size . If a customer chooses me then I’ll go back and do my room by room calculations but I won’t blow my full load unless I’m getting the job it’s plain and simple . You get what you pay for . I deal with/over come this objection regularly with no issue
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.
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.
The Engineering Mindset awesome thank you!! Just contemplating, maybe you could show the conversion on the screen but not necessarily say it? I REALLY enjoy your videos, they help out so much!! Keep em coming!!
I try as much as possible to include both units but this video just went on for too long so unfortunately had to trim it back and default to metric. The method is the same for both, just the units are different.
Bernhard Jordan Yes you can but circular duct comes in standard diameters and it is usually stock item. If you want an odd size you will have to pay extra and deal with the lead times.
With rectangular duct you can make any size you want to achieve the same pressure drop. However, you might have to reduce your duct size a lot and then the velocity becomes too big, hence noise in the system. Dampers provide much more control when you are commissioning the sytem.
Depends on the application (restaurant, office, hospital etc) if it is a main run or a branch etc.
As a rule of thumb, dont go over 9m/s as you will get excessive losses due to friction and noise.
You will need to refer to the relevant industry body for guidelines.
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