How Air Handling Units work AHU working principle hvac ventilation
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Date: 2023-11-17
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Comments and reviews: 30
Automat
I'm involved with this equpiment frequently so (hopefully) the majority of the video is something I already know and am familiar with. In regards to your remark regarding centrifugal fans, I'm not entirely sure that was the proper way to describe it. Would it be more fair in your opinion to state that many old and existing ahus use PSC motors and that EC motors are becoming more common? Maybe I'm mistaken but I believe you will still find centrifugal fan designs even with EC motors.
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I'm involved with this equpiment frequently so (hopefully) the majority of the video is something I already know and am familiar with. In regards to your remark regarding centrifugal fans, I'm not entirely sure that was the proper way to describe it. Would it be more fair in your opinion to state that many old and existing ahus use PSC motors and that EC motors are becoming more common? Maybe I'm mistaken but I believe you will still find centrifugal fan designs even with EC motors.
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Very good video! There are also other, more effective types of heat-exhangers in AHU's to capture the heat of the extracted air that are more ffective than the one with coils, but it's a very good example. Rotary heat exhangers as an example are very effective, but risk returning smells into the incoming air, but again, there are other variants still.
Cheers on a good video!
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Very good video! There are also other, more effective types of heat-exhangers in AHU's to capture the heat of the extracted air that are more ffective than the one with coils, but it's a very good example. Rotary heat exhangers as an example are very effective, but risk returning smells into the incoming air, but again, there are other variants still.
Cheers on a good video!
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Antoy
Why is the AHU so lengthy with plenty of empty space? Is empty space required to avoid turbulence for example?
Also, are workers worried about the biohazard of working in the AHU dedicated to building bathrooms? Are AHUs carriers of diseases?
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Why is the AHU so lengthy with plenty of empty space? Is empty space required to avoid turbulence for example?
Also, are workers worried about the biohazard of working in the AHU dedicated to building bathrooms? Are AHUs carriers of diseases?
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Gary
Awesome video. Anyone knows if there's an instrument to measure supply air pressure output at the AHU before it enters the main supply duct line? This is to know if the unit is producing enough pressure thrust especially for older units. Thanks
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Awesome video. Anyone knows if there's an instrument to measure supply air pressure output at the AHU before it enters the main supply duct line? This is to know if the unit is producing enough pressure thrust especially for older units. Thanks
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Adam
When you talk about the fans you say there are centrifugal type and electronically commutated. What a bizarre dichotomy considering they are describing two completely different parts. Plenty of centrifugal blowers have EC motors on them.
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When you talk about the fans you say there are centrifugal type and electronically commutated. What a bizarre dichotomy considering they are describing two completely different parts. Plenty of centrifugal blowers have EC motors on them.
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dave
Great video. Everyone's putting there's trade down. I install the ductwork and land and connect ahu's. Have done for 9 year's in hotels and hospitals in the uk. Never seen a fhu. Guess theres alot of dirty air getting pumped around
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Great video. Everyone's putting there's trade down. I install the ductwork and land and connect ahu's. Have done for 9 year's in hotels and hospitals in the uk. Never seen a fhu. Guess theres alot of dirty air getting pumped around
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Josh
I am working in a company fabricating AHUs but i was the one whos fabricating the panels in a automation machine process which is it can punch/shear/bend in one system. its very nice thing to hear how this AHUS work.
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I am working in a company fabricating AHUs but i was the one whos fabricating the panels in a automation machine process which is it can punch/shear/bend in one system. its very nice thing to hear how this AHUS work.
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Jelle
Service engineer from the Netherlands here. Great video and explaination. I have never seen exhaust units without filter. It is common to have inlet and exhaust filters here. No matter if there is a heating wheel.
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Service engineer from the Netherlands here. Great video and explaination. I have never seen exhaust units without filter. It is common to have inlet and exhaust filters here. No matter if there is a heating wheel.
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education
Question. Single family home. I had two hvac companies check my ahu. they was working on the wiring. Nothing changed. When its cold, its colder inside than out. When its hot, its hotter inside than out
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Question. Single family home. I had two hvac companies check my ahu. they was working on the wiring. Nothing changed. When its cold, its colder inside than out. When its hot, its hotter inside than out
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Atheekur
major difference between FAHU and AHU are FAHU used fresh air take from atmosphere but heat exchange between return air to fresh by thermal wheel. AHU is recirculate air from return air to supply air.
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major difference between FAHU and AHU are FAHU used fresh air take from atmosphere but heat exchange between return air to fresh by thermal wheel. AHU is recirculate air from return air to supply air.
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Mech
I work on these AHUs every day and in the uk at NHS hospitals we have 40 of them and also air curtains in theatres. Very interesting work although its only 10% of our job. This was a great video.
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I work on these AHUs every day and in the uk at NHS hospitals we have 40 of them and also air curtains in theatres. Very interesting work although its only 10% of our job. This was a great video.
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Sarsgarrs
I've never heard it called a FAHU before. I suppose it depends on the over all system but I usually call them MAU or DOAS these the former implies air is being taken out somewhere else
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I've never heard it called a FAHU before. I suppose it depends on the over all system but I usually call them MAU or DOAS these the former implies air is being taken out somewhere else
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Gianni
Was struggling a lot with comprehension and retention of these concepts with my online HVAC courses. This was so easy and well illustrated it solved all my problems. Thank you so much!
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Was struggling a lot with comprehension and retention of these concepts with my online HVAC courses. This was so easy and well illustrated it solved all my problems. Thank you so much!
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ISMAEL
Great training video, the only issue I see here is the placement of the coils, heating coils are always in front of the chill water coil to protected them from cold temperatures drops.
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Great training video, the only issue I see here is the placement of the coils, heating coils are always in front of the chill water coil to protected them from cold temperatures drops.
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indian
Coil. filters. fan. elimeter wheel. damper.
Fresh air ahu.
Comfort ahu.
HRW. ahu.
Watcul ahu.
. but only plug fan ahus. avilevel.
DX coil.
Cooling coil
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Coil. filters. fan. elimeter wheel. damper.
Fresh air ahu.
Comfort ahu.
HRW. ahu.
Watcul ahu.
. but only plug fan ahus. avilevel.
DX coil.
Cooling coil
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Cyril
I think if FAHU means Fresh air handling unit therefore the difference is that the ventilation cooling load will be much higher since theres no return air involved. Just my guess
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I think if FAHU means Fresh air handling unit therefore the difference is that the ventilation cooling load will be much higher since theres no return air involved. Just my guess
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Landon
Thanks for the vid, understanding hvac systems helps me feel more gratitude for the laborers that work on these systems to make buildings feel comfortable and normal.
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Thanks for the vid, understanding hvac systems helps me feel more gratitude for the laborers that work on these systems to make buildings feel comfortable and normal.
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Ineza
Hello this Very lmportant to have HVAC but in the next video help us to give us different between FCU, Ahu, when it's work in cools, Hot, and dry seasons thank you
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Hello this Very lmportant to have HVAC but in the next video help us to give us different between FCU, Ahu, when it's work in cools, Hot, and dry seasons thank you
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USMC
Im loving these videos. Im a construction project manager for commercial buildings and your videos have helped me understand HVAC a lot better. Thank you!
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Im loving these videos. Im a construction project manager for commercial buildings and your videos have helped me understand HVAC a lot better. Thank you!
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Stunning
FAHU doesn't recirculate the air once supplied, it supplies 100% fresh air
While AHU recirculate the air and can be take 20-30% fresh air
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FAHU doesn't recirculate the air once supplied, it supplies 100% fresh air
While AHU recirculate the air and can be take 20-30% fresh air
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Renn
That run around system for heat recovery can also be used in place of that electric pre-heat coil for the 100% OSA/100%RA-EXH systems.
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That run around system for heat recovery can also be used in place of that electric pre-heat coil for the 100% OSA/100%RA-EXH systems.
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Liam
The heating engineer that services Gotham city damn batman, he keeps ripping off these important components to sneak into buildings
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The heating engineer that services Gotham city damn batman, he keeps ripping off these important components to sneak into buildings
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Daniel
11: 36 isn't it a bit inefficient to have the exhaust grill right next to the intake of the AHU if we don't want recirculation?
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11: 36 isn't it a bit inefficient to have the exhaust grill right next to the intake of the AHU if we don't want recirculation?
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Financipation
Nicely explained
Im a Mechanical Engineer by Trade and have done HVAC design for Years and I approve this message
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Nicely explained
Im a Mechanical Engineer by Trade and have done HVAC design for Years and I approve this message
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Benjamin
Hi, won't the humidifier cause corrosion to the centrifugal/EC type fan as the steam or water mist is directed towards it?
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Hi, won't the humidifier cause corrosion to the centrifugal/EC type fan as the steam or water mist is directed towards it?
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Matthew
I rather have indoor air units on a floor someone instead of a ceiling you dont want them breaking and falling on your head
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I rather have indoor air units on a floor someone instead of a ceiling you dont want them breaking and falling on your head
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Kyra
If a humidifier is necessary wouldn't it be smarter to place it after the fan to reduce any additional wear on the equipment?
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If a humidifier is necessary wouldn't it be smarter to place it after the fan to reduce any additional wear on the equipment?
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simsInnovation
Greetings. I have a question in 5: 07. Is or can the heating coil be connected to the domestic hot water system?
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Greetings. I have a question in 5: 07. Is or can the heating coil be connected to the domestic hot water system?
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Jovan
Im maitenance worker at a hotel; and i been operating an AHU for almost like a year now without knowing what AHU means.
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Im maitenance worker at a hotel; and i been operating an AHU for almost like a year now without knowing what AHU means.
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Orlando
Can you please send me schematic electrical diagram of a 3kw genset and sequence of operation explained? Thank you.
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Can you please send me schematic electrical diagram of a 3kw genset and sequence of operation explained? Thank you.
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