Variable Air Volume - VAV system HVAC

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Please make a video about choosing the right HVAC system by building type. Thanks

wow i am so thankful you made this video now i have a better understanding on how it all works together . i am about to graduate my HVAC/R this year . I,m really into this stuff

Respected sir, Your channel is very useful, Kindly add video on duct design,static pressure, cfm calculation

Best educational video I've seen , clear and to the point. Thank you..!

Great video! Most of the information here is 100% correct, but if I may correct you on a few points: 1. You mentioned ‘dirty air from the rooms can be chucked outside’ but this is not really the purpose of the relief path. The set of dampers after the return fan leading to the outside are typically modulated to maintain building static pressure in relation the outside. Typically the set point is somewhere around “+0.05 in. wc.” This is necessary to keep your building positive so that unwanted air doesn’t infiltrate around doors/windows from the outside. This way the outside air necessary for maintaining indoor air quality can be introduced through the AHU and can be conditioned as desired. Dirty air is simply cleaned by the filters in the AHU and by always introducing some designed amount of fresh air through the outside air path. 2: There are typically two types of fan powered VAVs, either series or parallel. Your schematic shows the fan to not be in series with the airstream so that would be a parallel configuration in which typically the fan is only running when the zone calls for heat. In a series configuration (not pictured) the fan is always running and the primary air from the AHU must pass through the fan. that is closer to how you described it which may be a little misleading. 3: Typically the duct static pressure sensor used to modulate the supply fan is mounted approximately “2/3” of the way down the primary air duct not at the end. Anyways thanks for the video, nice work!

Quite explaining yet simple 👌👍🏻, best video on VAV .

Excellent 3D model again. Not too complicated, with a lot of detail.

We had to install some VAV boxes w their own EAC (Electronic Air Cleaner) in each due to the designated rooms having commercial computer systems, each box had it's own filter just before the EAC, the puter rooms had their own HVAC systems that were specified for more than the usual room specs since puters like cold air, twice to 3 times the usual for the room size but that's just bigger units, 'been there & done that' on other jobs. Although I'm familiar w this stuff it's fun to watch and I can share the vid sites to help non HVAC ppl understand the basic physics of it all and that's really what it comes down to but so many ppl don't grasp physics or weren't taught it. Gotta question the education system. Anyway great vid and great ch, keep up the good work.

Thank you for sharing this!! One video on BTU meter please?

Thanks for all the information u r providing here, it's very helpful for me, I would like to have some more videos on different types of central ac like package ac, split ac, and also cassette ac, thanks and I hope u will consider my request

kudos for your clear explanation. Also, can you do a video or training on HVAC and ducts design I will so much appreciate if I can get this

i always appreciate your videos thanks a lot for taking your time to do this

Thank you for the videos . Really appreciate it

Wow this is extremely helpful, very well appreciated!

Just i want to thank u very much for ur efforts...i am really enjoying ur explanation to the systems.. thank u very much Again...please keep going

On some of the bigger buildings I find they use vav for cooling the interior space and FPT for the exterior with either electric reheat or hot water actuators

Great, thorough explanation

As always amazing explanation ..

This is excellent, very helpful!