How to use a ductulator?
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- Опубликовано: 26 дек 2020
- I have to use a ductulator on almost every job estimate that I go to.
Air Flow is the Number 1 problem in the HVAC field..
FPM Feet Per Minute is measured with a anemometer
CFM Cubic Feet Per Minute is 350 to 400 CFM per ton residential
Static Pressure/Total External Static Pressure measured with a Magnehelic
are all super important.
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Yellow Jacket 42004 Series 41 Manifold with 3-1/8" Gauge
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Fieldpiece SC440 True RMS Clamp Meter with Temperature, Inrush Current, Capacitance and Backlight
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Fieldpiece - TC24 - Pipe Clamp Thermocouple
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Fieldpiece SPK2 Folding Pocket in-Duct Thermometer
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Fieldpiece SC440 True RMS Clamp Meter
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Fieldpiece SRH3 In-Duct Digital Psychrometer
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Testo Digital Pocket Vane Anemometer
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Ductulator
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0.1 friction loss to calculate supply duct size and .05 friction loss to calculate return duct size
I am learning lot with you , you are my best teacher.thanks
Thank You for watching
After spending 35 years in engineering, while using only SI units, it’s still shocking to encounter “freedom“ units in the wild. Thanks for this video. It’s nice to see a professional using the right tools for the job. Keep up the good work.
I used one of these in engineering school when I took an HVAC design class. Was a super useful tool
Wow very cool Josh 😎
Engineering School sounds fun
I usually use .01 friction loss at 500 cfm per ton for heat pumps, 400 cfm per ton for ac only, for return if your velocity is higher then 500fpm you will blow the water off the coil in cooling but like what you did my friend , Q=VA, you can check your equation cfm on equipment before u start, CFM=Btu output/1.08*delta t before you start a project as well
what is *delta.?
* is for multiplying instead of using the x symbol. And it’s delta t - for temperature difference between supply and return
Thank you for helping me with understanding this a lot better.
You're welcome I'm so glad that you watched and I'm glad that you learned.
Continue to learn you will be thankful for the result
Great videos Tad
Thanks my brother.
Usually on most air handler there will be a maximum external static pressure stamped but that take into account evap coil loss, cabinet loss, and filter loss, the static using a manometer cannot exceed that or you may have to reduce speed or gain speed of blower depending, most installation manuals have a chart and when you figure out your total external static with a manometer at least you know where ur sitting
good job, thanks Tad
You're welcome my brother
Great work thank you so much buddy. God bless you. Super helpful.
You're welcome
Glad it was helpful
Great info
Thanks! This video helped me
Glad it helped!
This helped a lot thank you.
You're welcome my friend thank you so much for watching
I really need to start knowing this kinda stuff
Trimmed the beard Tad! Nice.
You know it!
¡Gracias!
Good afternoon, why we use 0.5?
Pl advise best software or manuals
Round / circular process duct calculation including, Expansion joint, Stiffner, development, pressure drop, Load calculation on each support
Is the static pressure different from sheet metal to fiberglass duct?
How do you determine supply plenum size?
My way of learning is like a domino effect. If I don't get the very first thing then everything else doesn't matter.
At the beginning you said you use .05
That's the part you kind of just went over real fast. So what is that 0.5? Is that what the air handler or furnace total external static pressure rating is? I'm not sure what that .05 is referring to
Thanks
how to size supply when the blower is in middle of the house? 3 bedrooms 1 bath in one end 1 bath, kitchen/living room in other end
Great !!!
Thank you 😊
Ran across this vid u mentioned RT FPM SHOULD NOT BE MORE THE 500 ,HOW DO U ADDRESS THAT ISSUE IF IT IS MORE THE 500 ?
Hey Tad. Great videos! Could you let us know why you've decided to use .01 instead of .05? On another brand of equipment it says to use .2 I know to follow specs for each equipment. But I'm just curious
Hey Caleb Thank you for watching 👀 😀 I can definitely make a video about static pressure and manufacturers equipment.
@@TaddyDigest that's awesome! Look forward to watching brother. You have a excellent way of explaining
Great video boss!
I use the ACCA one. It separates metal, duct board and flex.
very cool Gene
BINGO!
Why are you using .05 friction loss? If you calculate tel and asp the math usually leads to .08 to 1.3 friction loss for determining the size of the ductwork. I'm curious where you get such a low friction rate(metal duct?).
How do you size ductwork where each room requires a specific CFM based on the Manual J? Currently using Cool Calc and some rooms require specific CFMs.
Stay with manual J lol
Hi tad where can I get a book like this reading material
Check out the link in the description
So I’ve been trying to figure this answer out for a couple days now. Why do you use .05? And I hear others use .1 and others .01. What factors go into choosing your friction loss?
A load calculation needs to be done. Then you need to figure out what your ASP available static pressure. Then you must figure your TEL Total equivalent duct length. Then you take that ASP and multiply it by 100 then divide that by your TEL that gives you the correct Friction rate for the system being designed. All these other people using .05, .01, .1, etc are just playing the guessing game and giving that customer a generic factored system that will never be effective nor efficient!
How do you place this particular anemometer to measure the velocity?
I have another video you should check out that show you how
Wouldn't reducing pipes mess with the fps just like water pipes when you reduce it it ads pressure
yes
Hey there,
What if it’s only for heating? A new gas furnace, single zone, 60,000 btus. I know all my room dimensions and requirements . I’m adding heat for the first floor only, ducted. Do you still go by tonnage? I’m m trying to figure my trunk size. I’m sure it’s the total of all the taps down the line. Plus I need the specs on the furnace I’m sure.
Basically, in short, my question is, isn’t that CFM for cooling return what is CFM for heating BTUs?
Scratch the word return that was voice texting. I know is that CFM for COOLING. What is the CFM for HEATING?
I'll do a video about this in a week or so
Thanks man 🤙🏽
your welcome 🙏 🤗 ☺️
Why not calculate your actual FR?
On existing jobs, you should
When you're planning on building duck work for your job, you have to have an FR.
You said you used to use .01 for static pressure now you use .05. What prompted the change?
went from R22 to 410A
@@TaddyDigest different refrigerants cause different static pressures in the duct work?
@@TaddyDigest I'm still new so I'm trying to figure out how to find and set static pressures when using a duculator..
duct sizes increased with the change in equipment
@@TaddyDigest ahh. The static pressure is set to what you would like it to optimally be
From my understanding, odd number duct sizes require a custom job, but this was not covered in the videos
custom orders
Yeah usually there is square duct which has to be custom built or round pipe you can get all the fittings you need for that at most supply places
I have a In depth video on diy ductwork if your interested
@@TaddyDigest From my classes in this area, it was suggested that instead of going for the odd number, size up or down by one unit.
As money was usually an issue, it was normal to size down one unit. Example, instead of using a 13", one would size down one unit to 12" or up one unit to 14". As it is cheaper to size down one unit, in this example, 12" would be chosen instead.
If we have 800 sf house and we have 2 rooms 1 living room , 1 bathroom,and 1 laundry room,and we have 1.5 ton unit how we gonna calculate the amount of air for each room and how many returns we need ?
Good question I need to do a video to be able to explain this
I will do a live video or a recorded video very soon
Romans 8:31
if God is for us who can be against us?
I'm visiting this video again. Very frustrating watching this.
You used to use .01
You now use .05
Others use .08
and even others use .1
Whatever you choose will dramatically change the size of the duct.
So without any explanation of why you choose .05 when you use to choose .01, I am left more confused than ever.
So I guess we could pick what we want? I pick....hmmmm 🤔🤔🤔... I pick 3.5. heck why not?
Do you get where I'm going with this? I like your videos but nobody really truly explains this part.
I will do a video and explain my friend
Where is your load calculation? Where is your ASPx100 divided by your TEL to get your correct friction rate. You are giving those people bombed information. Got to do better if you are going to try to give other tech’s advice man!
Where is your load calculation? Where is your ASPx100 divided by your TEL to get your correct friction rate. You are giving those people bombed information. Got to do better if you are going to try to give other tech’s advice man!
A load calculation is a great idea and it's a must
I have more videos where I speak about Such load calculations
Really appreciate you sharing your knowledge my friend.