Excellent explanation, have just read about 4 books on Air conditioning and you have explained FCU's far more clearly in this 13 minute video. Hat's off to you sir!
Sir you are the best , i was taken 9 months to learn this system but after in this period unable to understand the whole system how it works but your 13 minutes video is enough to teach how it actually fcu working, thankyou so much for your valuable information for us.
Really appreciate the work u do to explain each system with the help on 3d models . It makes understanding so simple. Giving real time images and pictures also helps. I will surely donate and promote you .
I just got into my career field as an apprentice engineer. I just want to say thank you for this video. It's helping me understand these units so much more.
Nice to see engineer stand/point of design inside of most office spaces. In the US most units also have FCU with newer FD motors available in most applications.
What is the difference b/w FCU, Fan Powered Terminal Units, and FVAV units? I am familiar with the FCU, but I haven't been able to find much information on the others. Your videos are really helpful, and I appreciate the time you take to make them. The graphics are great for a visual learner like myself. Thank you!
VAVs (variable air volume) always remain on and will adjust the air flow to the demand. This allows for pretty good dehumidification and fresh air supply at low fan speeds. Fan coils usually act the same as a central system turning on and off when the thermostat calls for it. Terminal units specialize in supplying fresh air and quite often don't have components to cool or heat the air at all. Sometimes they will have integrated heat (hydronic or electric) to keep the air warm enough to not freeze in the ducts.
Ohh mannn, this helps me lot than you think. Working on my final exam project n I was worried about Air Distribution System because of small space between ceiling and roof
Hai....Gave a good explanation about the topic with real time photos and videos...Can you please upload videos about the installation procedures of ductwork and accessories based on the sitedrawings...
What are the advantages and disadvantages of a FCU over a VAV system? Can an air handler have VAVs and FCUs together hooked up to it? If so, why would you use one instead of the other? I'm new to this industry and I've learned so much from your videos. Thanks
- The advantage of a FCU system is that you need much less space for the duct work and AHU's. - The advantage of a VAV system is that its easier to design a silent system especially if the units need to be installed in the occupied space, also less components = less maintenance. - Yes technically you can combine VAV boxes and FCU's in one system but you will need to use CAV/VAV dampers for zones that require a minimum fresh air flow to keep the system balanced (You will rarely see this though). - You need to consider all the advantages and disadvantages for the specific building when designing a system, one is not better than the other.
this help me so much to learn about FCU, btw can i remake this videos and make the explanation with my country languages ? i think it will be help people in my country to understand about this FCU with explanation in my languages thankyou
Fantastic videos I've recently started to work in building maintenance services and I think I can learn a lot of stuff from this channel keep up the good work thank you!
Superb video. Thank you! One question, can you explain why the inlet air to the FCU has a "open gap" instead of traveling inside ductwork the entire way?
Thank you, Paul! I have an assignment where we have to do HVAC systems for a complex apartment building. Can you please do a simple Revit tutorial on how to do an All-Water Fan Coil system that has its own Fan Coil Unit inside the apartment (in a AC closet) that is connected to the cooling tower on the roof? Thank you so much.
Amazing videos I really appreciate it, just have one question why the air supply duct is not connected to the fan coil unit ? I don’t think this was addressed in the video just mentioned
Very good explanation !. Thanks, I undestand much more now in my condo unit. High rise building Bulkheads tend to have a lot of dust inside the bulkheads as a result of fresh air from the main duct into the bulkhead space. It is unclear why my unit has this air pushed into this very large false ceiling void in my condo unit and why it is not directly placed in front of my Heating/cooling coil or connected to it. My 10 Year old highrise has lots of dust buildup inside the false ceiling void. Clearly as you say, it is to have some air mixture from the unit rooms into the ceiling grate and mix with the fresh air. Not a very good engineering design if you ask me. Maybe the false ceiling should be smaller or maybe the Fan source should have appropriate filters to manage the dust and hopefully would resolve this. thanks again
Thanks Paul! Question: is this fan coil same came which you’d shown in AHU video? I am trying to understand if it is a stand alone unit or part of AHU. Essentially the location and where it fits in HVAC system.
Great video, quick question, As the AHU also contains a heating and chilled flow and return is it not technically a much bigger version of a Fan Coil Unit?
Excellent description! I have a couple of questions: (1) Would there normally be a freeze-stat or freeze control at each FCU? and (2) Is the order of the heating and cooling coils important? For example, is the heating coil always between the fan and the cooling coil?
Is there, or was there older technology in a Dual Temp System that created a blended water temperature in the plant system piping before it goes out to the FCU or UV...something like a typical kitchen faucet? Great videos. They are very helpful. Keep up the good work! Thanks
I’m not sure about dual water temp systems (usually only one temp runs at a time) but most (if not all) heating systems I’ve seen have a modulating valve to mix some of the heated water with the colder return water.
Very nice and very useful, i was thinking if you can give us an example how to calculate the flow to be introduced into the fan coil and its blowing temperature or if you can just tell me where can i find all those stuff ??? thank you
Informative vid thanks a million.. Is it a requirement that the fresh air AHU has a return duct and if what happens if you just dump fresh air in the FCU without returning? and why is the fresh air not connected directly to the FCU?
I have seen buildings without but its more energy efficient to use one, the positive pressure needs to go somewhere. If you dump too much in without removing the you're going to pressurise the room and you'll hear squealing noise around gaps. You could connect it directly but it's going to be very energy intensive
Well done. If I ask you the main difference between fcu and Ahu,what would be it? My second question is that how a chilled water pipe is connected to cooling coil? Is it connected directly or do we use something like flexible pipe in between cooling coil and chilled water pipe? Please answer my question. Thanks
fcu is local control, ahu is large area control. Pipework is distributed throughout the building and then smaller pipes run off to each fcu. Check a manufacturer install guide it will show you example.
Big difference is AHU meant to be for large areas and FCUs are generally meant to be smaller areas such as bedrooms, small lobbies, small meeting rooms etc.. another difference is that FCU has small cfm capacity and it should be of forward curved where in case of AHu we can use backward curved centrifugal fans or plug fans of which efficiency os more comparatively as tht of FCU
I have a question. When I learned this part from other book, the unit "AHU" mentioned in your video was called "PAU"(Primary Air Unit) and "FCU"(your video) was called "AHU". Is that also right?
Can you explain how alternative heating and cooling sources work, this is when neither a boiler or chiller plants are present. You mentioned that refrigerant or electric elements are used but how does that work? And is it also used in the AHU?
Quick question: If every room contains its own FCU that controls the temp, then what is the point of the coils in the AHU which are also heating and cooling the air?
Bodega Mouse the FCU's are not sized to condition all the air. imagine in peak winter/summer when the temperature of the outside air is extremely low/high. the little coil in the FCU can't cope, so the main AHU will. There are times in the year when the air temp outside is within setpoint limits so the AHU could will not run, then it is up to the local FCU to decide if it needs htg/clg
You are correct that the AHU will bring the fresh air in and bring it to a usable temperature. The AHU is essentially there to supply fresh air to the building to keep the occupants healthy. The FCU's are usually a ways away from the AHU and will need to bring the supply air to the final temperature to keep the occupants comfortable. This means that the AHU's primary job is to bring in fresh and temper it for branch units like FCU's.
Since the air is first cooled in AHU by the cooling coil and then in the FCU by its own cooling coil. Can we say it is a two stage cooling system ? Kindly help the noob here.
At around 1:37: This fresh air is directed into the back side, the inlet, of the fan coil unit but this branch isn’t usually directly connected to the unit, there is a gap between the two. There is a reason for that, which we’ll look at later. So why isn't it connected then?
Fresh air supplied by AHU is already pre-conditioned. Is there a requirement between the temperature of the air supplied by AHU to the FCU? or is there delta T range between the supplied air by AHU and cooling coil of FCU? Thanks.
Yes depends on the system though, VAV system has a temperature setpoint. Watch these CAV: ruclips.net/video/XgQ3v6lvoZQ/видео.html VAV: ruclips.net/video/HBmOyeWtpHg/видео.html
⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕
PayPal: www.paypal.me/TheEngineerinMindset
Hello, we would like to translate this video into Russian and use link on our web site. Please let me know if it's possible
great video some times we need to see it to understand it
Excellent explanation, have just read about 4 books on Air conditioning and you have explained FCU's far more clearly in this 13 minute video. Hat's off to you sir!
Sir you are the best , i was taken 9 months to learn this system but after in this period unable to understand the whole system how it works but your 13 minutes video is enough to teach how it actually fcu working, thankyou so much for your valuable information for us.
Really appreciate the work u do to explain each system with the help on 3d models . It makes understanding so simple. Giving real time images and pictures also helps. I will surely donate and promote you .
You've changed so many people's worlds mate.
Getting me through my degree, one video at a time! Thanks Paul!
What degree is it that you’re working towards?
@@tidurphious mech i think
I just got into my career field as an apprentice engineer. I just want to say thank you for this video. It's helping me understand these units so much more.
Glad it's helping, Mike.
We have FCUs and my job! Thanks to you I am starting to understand how it works!
Nice to see engineer stand/point of design inside of most office spaces. In the US most units also have FCU with newer FD motors available in most applications.
what a comprehensive explanation that won my heart
Finally found a clear and informative explanation on proper English. Thank you very much
What is the difference b/w FCU, Fan Powered Terminal Units, and FVAV units? I am familiar with the FCU, but I haven't been able to find much information on the others. Your videos are really helpful, and I appreciate the time you take to make them. The graphics are great for a visual learner like myself. Thank you!
I second this request, please :)
VAVs (variable air volume) always remain on and will adjust the air flow to the demand. This allows for pretty good dehumidification and fresh air supply at low fan speeds. Fan coils usually act the same as a central system turning on and off when the thermostat calls for it. Terminal units specialize in supplying fresh air and quite often don't have components to cool or heat the air at all. Sometimes they will have integrated heat (hydronic or electric) to keep the air warm enough to not freeze in the ducts.
Paul. You are our greatest teacher.
Ohh mannn, this helps me lot than you think. Working on my final exam project n I was worried about Air Distribution System because of small space between ceiling and roof
First of all Thanks alot for giving such kind of technical videos.
Kindly keep these efforts up
Hai....Gave a good explanation about the topic with real time photos and videos...Can you please upload videos about the installation procedures of ductwork and accessories based on the sitedrawings...
What are the advantages and disadvantages of a FCU over a VAV system?
Can an air handler have VAVs and FCUs together hooked up to it? If so, why would you use one instead of the other?
I'm new to this industry and I've learned so much from your videos. Thanks
It's worth covering in a video, ill add it to the list
- The advantage of a FCU system is that you need much less space for the duct work and AHU's.
- The advantage of a VAV system is that its easier to design a silent system especially if the units need to be installed in the occupied space, also less components = less maintenance.
- Yes technically you can combine VAV boxes and FCU's in one system but you will need to use CAV/VAV dampers for zones that require a minimum fresh air flow to keep the system balanced (You will rarely see this though).
- You need to consider all the advantages and disadvantages for the specific building when designing a system, one is not better than the other.
this help me so much to learn about FCU, btw can i remake this videos and make the explanation with my country languages ? i think it will be help people in my country to understand about this FCU with explanation in my languages
thankyou
No
Fantastic videos I've recently started to work in building maintenance services and I think I can learn a lot of stuff from this channel keep up the good work thank you!
Hi Paul Very well explained..just one doubt, why their is a gap between fcu filter and fresh air supply..
Superb video. Thank you! One question, can you explain why the inlet air to the FCU has a "open gap" instead of traveling inside ductwork the entire way?
please include this video in your HVAV Training Playlist
The best HVAC tutor ✨
Thank you, Paul! I have an assignment where we have to do HVAC systems for a complex apartment building. Can you please do a simple Revit tutorial on how to do an All-Water Fan Coil system that has its own Fan Coil Unit inside the apartment (in a AC closet) that is connected to the cooling tower on the roof? Thank you so much.
really helpful for my power engineering exams :)
My Respect Master Engineer 🙌 From 🇲🇽 Support and Doing it
my god!! excellent visual representation along with narration. Thank you so much.
These are some of the best and most concise videos I've found on HVAC. Any chance you can do one about VRF and Dedicated Outside Air systems?
New VRF unit video here:➡️ ruclips.net/video/4i1XgcP1tmw/видео.html
Amazing videos I really appreciate it, just have one question why the air supply duct is not connected to the fan coil unit ? I don’t think this was addressed in the video just mentioned
Very good explanation !. Thanks, I undestand much more now in my condo unit. High rise building Bulkheads tend to have a lot of dust inside the bulkheads as a result of fresh air from the main duct into the bulkhead space. It is unclear why my unit has this air pushed into this very large false ceiling void in my condo unit and why it is not directly placed in front of my Heating/cooling coil or connected to it. My 10 Year old highrise has lots of dust buildup inside the false ceiling void. Clearly as you say, it is to have some air mixture from the unit rooms into the ceiling grate and mix with the fresh air. Not a very good engineering design if you ask me. Maybe the false ceiling should be smaller or maybe the Fan source should have appropriate filters to manage the dust and hopefully would resolve this. thanks again
Very nice presentation.... thanku... I would like to know how the temperature is controlling here?
This helped me so much! Thank you
Thank you
Thanks Paul! Question: is this fan coil same came which you’d shown in AHU video? I am trying to understand if it is a stand alone unit or part of AHU. Essentially the location and where it fits in HVAC system.
You are as clear as they come -kudos !
Amazing Video, Well explained with each tiny points that to 3D modules and real-time picture thank you.
Iam without doubt joining your channel
Great video, quick question, As the AHU also contains a heating and chilled flow and return is it not technically a much bigger version of a Fan Coil Unit?
pretty much but an ahu does more
Excellent description! I have a couple of questions: (1) Would there normally be a freeze-stat or freeze control at each FCU? and (2) Is the order of the heating and cooling coils important? For example, is the heating coil always between the fan and the cooling coil?
Those are usually requested by the customer. The freeze sensor usually cuts off power to the chilled water valve.
Thanks a lot
Really this channel is the best for engineers
Thanks a lot. Easiest description to understand most easily :)
Amazingly well put video, thank you!
Is there, or was there older technology in a Dual Temp System that created a blended water temperature in the plant system piping before it goes out to the FCU or UV...something like a typical kitchen faucet? Great videos. They are very helpful. Keep up the good work! Thanks
I’m not sure about dual water temp systems (usually only one temp runs at a time) but most (if not all) heating systems I’ve seen have a modulating valve to mix some of the heated water with the colder return water.
Very nice and very useful, i was thinking if you can give us an example how to calculate the flow to be introduced into the fan coil and its blowing temperature or if you can just tell me where can i find all those stuff ???
thank you
Excellent. Can you do a compare video between FCU, DX system and VAV. Would be great if you could extend into the relative efficiency of each system.
EXPECTING THE SAME ASAP
Informative vid thanks a million.. Is it a requirement that the fresh air AHU has a return duct and if what happens if you just dump fresh air in the FCU without returning? and why is the fresh air not connected directly to the FCU?
I have seen buildings without but its more energy efficient to use one, the positive pressure needs to go somewhere. If you dump too much in without removing the you're going to pressurise the room and you'll hear squealing noise around gaps. You could connect it directly but it's going to be very energy intensive
Than you for the video and the way you explain is very understanding.
Any video explaining the modes of operation in chillers?
Off, stand by, crankcase heater thermostat off .
Well done.
If I ask you the main difference between fcu and Ahu,what would be it?
My second question is that how a chilled water pipe is connected to cooling coil? Is it connected directly or do we use something like flexible pipe in between cooling coil and chilled water pipe?
Please answer my question. Thanks
fcu is local control, ahu is large area control. Pipework is distributed throughout the building and then smaller pipes run off to each fcu. Check a manufacturer install guide it will show you example.
if we can use fcu & vav together in a system? , if not why ?
Big difference is AHU meant to be for large areas and FCUs are generally meant to be smaller areas such as bedrooms, small lobbies, small meeting rooms etc.. another difference is that FCU has small cfm capacity and it should be of forward curved where in case of AHu we can use backward curved centrifugal fans or plug fans of which efficiency os more comparatively as tht of FCU
Thank you very much this video helped me very but I would like to suggest you please also type the name of elements .
Awesome work paul
it really helps thanks for your teaching😄😄😄
I don't know where else to ask, but can you do video on Power factor Correction
We have: ruclips.net/video/Tv_7XWf96gg/видео.html
pure cleaning simple English used good explanation thanks from a Safety officer
Best video I've seen explaining this. Thanks!
What is the difference between a fan coil unit and chilled beams? Do you have a video on chilled beams?
See hvac heat exchanger video
I have a question. When I learned this part from other book, the unit "AHU" mentioned in your video was called "PAU"(Primary Air Unit) and "FCU"(your video) was called "AHU". Is that also right?
very well executed video mate
Can you explain how alternative heating and cooling sources work, this is when neither a boiler or chiller plants are present. You mentioned that refrigerant or electric elements are used but how does that work? And is it also used in the AHU?
Try this heat pump video ruclips.net/video/QykwWs3L1W8/видео.html
Which one is more optimal? Water in from the bottom of the coil or the other way around?
Water in from the bottom, yes.
plz give details installtion procedure of AHU,RTU,FCU,and cooling tower and duct work
Quick question: If every room contains its own FCU that controls the temp, then what is the point of the coils in the AHU which are also heating and cooling the air?
Bodega Mouse the FCU's are not sized to condition all the air. imagine in peak winter/summer when the temperature of the outside air is extremely low/high. the little coil in the FCU can't cope, so the main AHU will. There are times in the year when the air temp outside is within setpoint limits so the AHU could will not run, then it is up to the local FCU to decide if it needs htg/clg
Finally I found an answer 😅
You are correct that the AHU will bring the fresh air in and bring it to a usable temperature. The AHU is essentially there to supply fresh air to the building to keep the occupants healthy. The FCU's are usually a ways away from the AHU and will need to bring the supply air to the final temperature to keep the occupants comfortable. This means that the AHU's primary job is to bring in fresh and temper it for branch units like FCU's.
Great video! This has been very helpful. Thank you.
Hi just had a small doubt. The AHU which supply the fresh air,will this air be cooled or at normal temperature?
all your videos are amazing
Thanks sir we need explanation Fcu - electrical controller box with BMS
sir can you make a video for selection of DX and VRF/VRV
New VRF unit video here:➡️ ruclips.net/video/4i1XgcP1tmw/видео.html
Thanks for your explanation, photos and videos.
Useful video. Helps a lot!
It seems that an FCU and AHU are similar, but must have some specific distinctions.
Thank you so much for this video. But i have questions sir. How to fix if its fcu is blowing air but not cooling. Plss answers sir thank you😊👍
Check two way valve & the thermostat setting.
Check the sensor of the thermostat.
Check the chilled water inlet/outlet pressure.
Check all the valves.
All video about HVAC are intereste
Thank a million my grateful mentor!
nice and helpful 3dv.thanks
Many thanks ! I'm happy with your explanation. Well done !
that's amazing explanation
thank you so much sir
Thanks for the Video. Its very useful
Well explained...Hats off
Perfect explanation
Since the air is first cooled in AHU by the cooling coil and then in the FCU by its own cooling coil. Can we say it is a two stage cooling system ?
Kindly help the noob here.
Can you please give us a video about the value package in ahu/fcu.
Really great and easy explaination.
At around 1:37: This fresh air is directed into the back side, the inlet, of the fan coil unit but this branch isn’t usually directly connected to the unit, there is a gap between the two.
There is a reason for that, which we’ll look at later. So why isn't it connected then?
GREAT explanation! thanks
Very nice explanation sir .
Thank you sir
Hello! Thanks for the video, it is very useful. Very clarifying. I suggest subtitling in Spanish to be the best
Española aqui: ruclips.net/video/7JDmvDzb5L8/видео.html
Good explanation
Excellent Video! Keep it up!
Thank you for your explanation
Very good video , Thanks
Thank you. that was extremely helpful
clear explanation video, Thank you
Do you plan to produce any boiler videos?
thank u s much .its quit informative video help me lot thank u again keep uploading such kind of video
Love your videos please keep going
Fresh air supplied by AHU is already pre-conditioned. Is there a requirement between the temperature of the air supplied by AHU to the FCU? or is there delta T range between the supplied air by AHU and cooling coil of FCU? Thanks.
Yes depends on the system though, VAV system has a temperature setpoint. Watch these
CAV: ruclips.net/video/XgQ3v6lvoZQ/видео.html
VAV: ruclips.net/video/HBmOyeWtpHg/видео.html
Great explanation 👌 👍 👏
good day gentlement,can you post of video regarding (EXPANSION TANK) on how this work...
Большое спасибо. Вы гений. В тренды.
Great video and teacher!
Excellent video. Highly informative