I'm a commercial hvac tech and your videos are amazing keep up the good job! I know guys that are in our apprenticeship class use your videos a lot! Nobody makes commercial hvac videos like this.
As far as background music goes, this video is the best. Because it actually accomplishes something, namely a lively air in terms of selection and volume that helps the viewer focus on the speaker. Woe to those viewers who have been subjected to videos featuring video makers' favorite music. Because, well, they have have bad taste in music. And, as all who have such taste, they like it loud.
When you mentioned the grid to stop animals and debris from entering it reminded me of one of our units at work that failed in a really weird way. They never figured out the cause so not sure if it has to do with something that got in but basically the main blower shaft was bent and it started to oscillate. The bend got worse and worse and it was basically shaking the whole building! We could hear various "tick tick tick" vibrations in the ceiling in random parts of the office, just from the false ceiling and light fixtures etc, and thought it was odd but did not think much of it. This got worse until one of us realized there was a really intense pulsating feeling on the 2nd floor. It was almost like a powerful subwoofer feeling and it felt different depending where you stand. The unit was in that room on the roof cooling that room. Supposedly the vibrations could be felt even outside the building at one point. The shaft that was bent was several inches in diameter, they still have no idea what happened, but it's fixed now. As a side note, getting parts from Carrier is like pulling teeth... They sent the wrong parts at least 3 times.
A packaged air conditioning means an AHU unit with an inbuilt cooling unit ( that is no attached component such as chillers). This Air Handling Unit cools the air and sends this cooled air through a defined route duct work. The returned air is leaves the building through a defined route duct work to the exhaust channel in the AHU unit.
A packed unit is a unit that contains all of the system components in one unit. In a home the evaporator is inside while the condenser is outside. In a packed unit all of the components are inside of one unit, like in a RTU.
Package ac unit is a combined unit, it is the bigger version of Window type ac. Only the difference is.. It is connected to a duct work. Correct me if I'm wrong. Thanks..
How u can be sure that exhaust air is going to different direction but not to fresh air blower and distribute the very bad smell into the flats. I am suffering with this issue, specially in Summer in Dubai. Do u know how long lasts Summer in Dubai? Exhaust air and fresh air can’t be in the same side and over each other, weird construction. Look at the grid which stops the front air and collect the air from exhaust air. Thank u for this video, it helped me to understand where that bad smell is coming from
Thank you for the great video, sir. When I saw a belt drive blower watching your video, one question came in my mind. Where do we use a belt drive blower; where do we use direct drive blower?
It used to come down to space. It was more compact to place the motor on a belt drive. Now it comes down to money. Direct drive is more expensive but more efficient. Belt drive is cheaper to buy initially but more expensive to run because it's less efficient and required more maintenance and spare.
Can you please make a video on equal friction and/or static regain calculations, including transition pieces and a wye (y) junction in the example. I’m taking a ventilation systems class now and this video would help soo much
Can you do a video about high, medium and low pressure systems and their different applications? Clean air systems would be a great topic also medical,lab and food filtration! Grease duct and hoods as well
I've seen some units that have an inside unit, which will have a full cooling cycle with compressor, and then will have an outside unit which will also have another compressor and cooling cycle, and there is glycol lines going between them. Essentially the glycol is used to cool the condenser and compressor in the indoor unit. What is the advantage of this vs just having a split system? Is it because a refrigeration loop has a limited working distance and the glycol lines can go further?
A flat (perpendicular to the ground) mechanical curb could installed and supported on the the sloped roof, that way the RTU itself would be flat. But as long as the ducts connected to the unit into the building are where they need to be, there wouldn't be any issue with the air flow and refrigerant flow inside the unit if it were sloped. The refrigerant is being pumped around and so it would flow no problem.
A lot of them are installed outside the building on the ground, then have two ducts going into the wall. I think they basically work the same way. My church has one. I think this is typical for buildings that don't have a flat roof as there is no way to install it on the roof. Also less chance of leakages. A roof top unit is harder to install properly as if you don't seal things right you can get leaks.
This is something I was asking myself. If I'm not mistaken, they're direct expansion systems. And to me this means the evaporator unity is the single coil connected to the refrigeration system, but out of its chamber, according to the video.
Sir can you make a video about economizer? Im struggling to see how economizer can be installed to an RTU so it can provide free cooling. Isnt traditional RTU can also allow 100 percent of cool outside air to pass in order to achieve free cooling? Thank you sir any answer will be appriciated
If the exhaust placed directly under the intake (which is facing down because of the air hood), wouldn't some of the exhaust air get sucked into the intake?
No thank you. We are working on languages ourselves and do not want our viewers going to another channel to view our content. To run a successful channel you must make original content yourself.
⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕
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I'm a commercial hvac tech and your videos are amazing keep up the good job! I know guys that are in our apprenticeship class use your videos a lot! Nobody makes commercial hvac videos like this.
As far as background music goes, this video is the best. Because it actually accomplishes something, namely a lively air in terms of selection and volume that helps the viewer focus on the speaker. Woe to those viewers who have been subjected to videos featuring video makers' favorite music. Because, well, they have have bad taste in music. And, as all who have such taste, they like it loud.
I'm thankful for smart 👍 folks like you. I pretty much attend school on your channel.
I'm working on a rooftop unit as we speak, found out the economizer is bad/ much appreciated
👍🌟🌟🌟🌟🌟
I love assembling air handling units especially the rooftop units for Nortek Air Solutions I do my best to make sure that no water can leak through
When you mentioned the grid to stop animals and debris from entering it reminded me of one of our units at work that failed in a really weird way. They never figured out the cause so not sure if it has to do with something that got in but basically the main blower shaft was bent and it started to oscillate. The bend got worse and worse and it was basically shaking the whole building! We could hear various "tick tick tick" vibrations in the ceiling in random parts of the office, just from the false ceiling and light fixtures etc, and thought it was odd but did not think much of it. This got worse until one of us realized there was a really intense pulsating feeling on the 2nd floor. It was almost like a powerful subwoofer feeling and it felt different depending where you stand. The unit was in that room on the roof cooling that room. Supposedly the vibrations could be felt even outside the building at one point. The shaft that was bent was several inches in diameter, they still have no idea what happened, but it's fixed now. As a side note, getting parts from Carrier is like pulling teeth... They sent the wrong parts at least 3 times.
A packaged air conditioning means an AHU unit with an inbuilt cooling unit ( that is no attached component such as chillers). This Air Handling Unit cools the air and sends this cooled air through a defined route duct work. The returned air is leaves the building through a defined route duct work to the exhaust channel in the AHU unit.
A packed unit is a unit that contains all of the system components in one unit. In a home the evaporator is inside while the condenser is outside. In a packed unit all of the components are inside of one unit, like in a RTU.
Simple as that
these videos are so good. Simple, straight forward and easy to understand .
very well explained.
RTU also used a Hot water heat chilled AC, would be great if you can make a video about it
Subscribed. Excellent HVAC theory. I know all this, but it was a quick refresher on RTU's and reminded me of important principles. Thank you!
Thank you for this video! You are the best.
Package ac unit is a combined unit, it is the bigger version of Window type ac. Only the difference is.. It is connected to a duct work. Correct me if I'm wrong. Thanks..
How u can be sure that exhaust air is going to different direction but not to fresh air blower and distribute the very bad smell into the flats. I am suffering with this issue, specially in Summer in Dubai. Do u know how long lasts Summer in Dubai? Exhaust air and fresh air can’t be in the same side and over each other, weird construction. Look at the grid which stops the front air and collect the air from exhaust air.
Thank u for this video, it helped me to understand where that bad smell is coming from
Excellent explanation..really impressive
Thank you, glad you enjoyed it
Thanks for your efforts
So, RTU and PACU are the same?
RTU is a type of PACU
@@EngineeringMindset can you tell me what are the other type of PACU
found this video very instructive
Thank you it is clear and easy to understand
Thank you for the great video, sir. When I saw a belt drive blower watching your video, one question came in my mind. Where do we use a belt drive blower; where do we use direct drive blower?
It used to come down to space. It was more compact to place the motor on a belt drive. Now it comes down to money. Direct drive is more expensive but more efficient. Belt drive is cheaper to buy initially but more expensive to run because it's less efficient and required more maintenance and spare.
@@EngineeringMindset Thank you, Sir.
Thank you! Great and helpful video for us - a young aspiring students.
I love painting unit like that!
I am not sure if you have answered this, but what's the difference between a RTU and Dedicated Outdoor Air System (DOAS)?
You are amazing !!! THANK YOU
Thank you it is clear and easy to understand, but made me remember our ahu that is not cold when we on it, can thermostat on actuator be reset
The first RTU shown with only outside air is called a dedicated outside air system or DOAS.
Great video!!! Easy to follow along and understand . Great visuals and great pace . Thank you for the content
Can you please make a video on equal friction and/or static regain calculations, including transition pieces and a wye (y) junction in the example. I’m taking a ventilation systems class now and this video would help soo much
Check out our ductwork video
Can you do a video about high, medium and low pressure systems and their different applications?
Clean air systems would be a great topic also medical,lab and food filtration!
Grease duct and hoods as well
😂 i see this comment being like the Vince McMan meme 🤣🤣🤣
I've seen some units that have an inside unit, which will have a full cooling cycle with compressor, and then will have an outside unit which will also have another compressor and cooling cycle, and there is glycol lines going between them. Essentially the glycol is used to cool the condenser and compressor in the indoor unit. What is the advantage of this vs just having a split system? Is it because a refrigeration loop has a limited working distance and the glycol lines can go further?
thanks mate. I did a small paypal contribution too.
Thanks for your support, much appreciated
Why did you choose the garden state plaza in Paramus NJ for the rooftop? I know that roof.
It was completely by chance. I zoomed in on Google maps and there happened to be RTU's there so I recorded it. Small world huh.
Haha good eye. I live in bergen county.
How to apply the right coating for anti-corrosion for rooftop units, especially for ducts exposed on the rooftop? Thanks!
Thank you Paul
A packaged unit is a type of AC unit which houses the condenser unit and air handler together.
Thank you! Very helpful!
We will about to Do HVAC on a 600 sqm Disco club can you advise what to do about HVAC? Do we need a RTU and Split type aircons?
Very useful video.
Do you guys have a video about makeup air units specifically?
Thank you sir helpful
EXCELLENT INFORMATION
Sir you explain about the valve of ahu
Can u please explain what is decoupler line in primary and secondary pumps of chilled water
Hi yes watch our chilled water schematic video
Is there a fan on the return air or does the suction from the supply air fan do both? Thanks!
Some units will have a fan there, some will use the suction side. Depends on the design and the building.
fantastic video
Great video!
As someone who is looking to get into hvac and needing training and nate certification how would yall recommend going about doing this.
Should call your channel the refrigeration mindset
Hey bro, could you make a video for explaining the electric wiring connection in a typical chiller during a start-up process. Thanks.
We have one on chiller controls ua-cam.com/channels/k0fGHsCEzGig-rSzkfCjMw.htmlvideos
thank you for the info.
Salut ! Mon air handling unit ne fonctionne pas bien,mais le tension est normal
Can you explain about mark-up air?
Thank you.
Very useful
Any videos on chiller controls?
Yes, check our other videos
Helo sir . I hope you will be good and fine. Make a video about pipes welding because the welding is also play important role in chiller water pipes.
Awesome info
Can a RTU installed in a sloped roof (1:100)? How efficient would that be? It seems to me that it will be impact the flow air and liquid in the unit.
A flat (perpendicular to the ground) mechanical curb could installed and supported on the the sloped roof, that way the RTU itself would be flat. But as long as the ducts connected to the unit into the building are where they need to be, there wouldn't be any issue with the air flow and refrigerant flow inside the unit if it were sloped. The refrigerant is being pumped around and so it would flow no problem.
question: don't we have a packaged AHU that are not installed on rooftops? If we do kindly give an example, please
A lot of them are installed outside the building on the ground, then have two ducts going into the wall. I think they basically work the same way. My church has one. I think this is typical for buildings that don't have a flat roof as there is no way to install it on the roof. Also less chance of leakages. A roof top unit is harder to install properly as if you don't seal things right you can get leaks.
Where does the cooling coil get the water from?
Can you do video on economizers
Have you check out our video on AHU's and chiller terminology, there's some info in there too
@@EngineeringMindset ok I'll review them
Is this also called packaged rooftop air conditioner?
a package unit it condenser and evaporator in the same unit.
Are RTU direct or indirect cooling systems?
This is something I was asking myself. If I'm not mistaken, they're direct expansion systems. And to me this means the evaporator unity is the single coil connected to the refrigeration system, but out of its chamber, according to the video.
Sir can you make a video about economizer? Im struggling to see how economizer can be installed to an RTU so it can provide free cooling. Isnt traditional RTU can also allow 100 percent of cool outside air to pass in order to achieve free cooling? Thank you sir any answer will be appriciated
If the exhaust placed directly under the intake (which is facing down because of the air hood), wouldn't some of the exhaust air get sucked into the intake?
Yes
Only part I'd change is the purpose of access panels. I've yet to see an engineer out in the field doing the maintenance.
tanks
4:19 shouldn’t the flow be reversed?
inb4 dassault systems fluid simulations
nope
Sir if don't mind, can I use your video animation in my UA-cam video, to explain it in other languages in my country. ...
No thank you. We are working on languages ourselves and do not want our viewers going to another channel to view our content. To run a successful channel you must make original content yourself.
Learn how *AIR HANDLING UNITS* work here ➡️ ua-cam.com/video/KCiv8IAUkh8/v-deo.html
Solar water heater and solar energy please
Seen our new video on HOW SOLAR PANELS WORK in detail ua-cam.com/video/Yxt72aDjFgY/v-deo.html
Bernier Ferry
Now I 100% know how inefficient these units really are.
Elaborate please
Michael duties or otherwise called also p a c u indoor and outdoor area Vikram status Pondicherry
I need to but I almost can't watch this video because the background music is so distracting
Please dubbing in Hindi language is videos
www.youtube.com/@EngineeringMindsetHindi