The energy required to provide the high pressure high flow air into the system would be way too much to provide without the use of a very large compressor and would be very inefficient. Aircrafts already have this source of air from the compressor stage of the jet engine. Noise would also be an issue.
Does that really work? The plastic hoses look like they would blow off or melt with the bleed air temperature, there is relatively high pressures and flows inside an aircraft PAC??
Sorry, but how does the air get cooled again? By extracting water and drying it out? Lots of talk about heating and reheating, but HOW does the air become cool?
When you compress, air heats. The air cycle machine does the opposite, it allows hot air to expand and cool in the expansion chamber. Before that happens the air would have already processed thru the heat exchanger that would make the first cooling impact over hot bleed air from the engine. Please refer to the lesson that talks about secondary heat exchanger. the ACM here is training model which functions on same basic principle as actual aircraft ACM except that it won't show you the actual engine attached to a wing.
This was a good example of an ACM layout, but not a good lesson on HOW it works. As he did mention (briefly) temperature does whatever pressure does... Px goes up.... Temp goes up. Px goes down... Temp goes down. Let's call this rule 1 The other important thing is that you can change temperature without effecting pressure much at all. Lets call this rule 2 Let's not get into the numbers, just imagine a scale from very low to very high. Air the plane is flying through...... px=v.low, temp=v.low Air goes into the engine compressor and into the bleed valve... px=high, temp=high (rule 1) Air passes through primary heat exchanger..... px=high, temp=medium (rule 2) Air goes through compressor of ACM...... px=v.high, temp=high (rule 1) Air passes through secondary heat exchanger.... px=v.high, temp=medium (rule 2) Air uses all that pressure to drive the turbine of the ACM, then empties out into a larger volume....px=medium, temp=v.low (rule 1) Now you have very cold air at a useful pressure. You can now mix it with hot air from the start of the cycle to get the temperature you want. It can now enter the cabin at a constant rate, you then vary the rate that it leaves the outflow valve and that's how you can adjust cabin pressure too! Hope that helps.
So this aircraft air conditioning system doesn’t require the gas used in domestic-like ACUs? Is it because of the constant ramming air that the aircraft is constantly receiving?
I still don’t see where the system can cool cabin air much below outside ambient temperature when you’re on the ground. Like, in a car, I understand where the refrigerant goes from a high temp and high pres liquid to a low pressure vapor (that is very cold) at the orifice tube, and after. But where is something like that happening here?
Thank you for this video! Mr. Khalid explained the topic in a concise yet very informative way! This video helped me a lot. Hoping for more videos like this. Thank you!
I am grateful to IATC such excellent demonstration of ACM and best ways to make student around the globe understand system although if you just try to isolate the air conditioning sound from the video it will be the best
انستركتر علي الخويطري الله يدب في قلبك الرعب وخسائر الوقت على كثر اسلوب الاحراج وترهيب وتحشير في الاسئله في اي شرح لدرجه فقدت الشغف في مجال طيران الله لا يسامحك على وقت اللي قضيته في كلاساتك واشكر شرح انستركتر خالد على شرحه المفهوم والبسيط والذي لخصه العملية كلها بـ10 دقائق عكس الانستركتر علي 40 دقيقة
Wooow, THANK YOU! Finally somebody can explain and also SHOW, how it works. Really helpful video, thank you so much 👍
Very clever design. Using heated and pressurized inlet air to do all the work needed to make cold air.
One of the best instructors in college
God is good. Thanks for your excellent explanation.
Amazing explanation, thank you!
Congratulations on a clean and objective lecture!
Thank you so much for this video!
I built one for my home saves alot of money.
Save a lot of money typically spent on what?
@@pimplepickerton A/C unit bro
I would like to build one too.. could you help where do i get the parts
imposible , how do you think to find this much of compresed air?
I built one too, save at least $1299.99 a year
Well explained 👍
Waelequmasslam sir.. thankyou for explanation
Wow! what explanation!
well explained every part of ACM. wooow
Could you tell me why don't we use ACM instead of conventional Air conditioner?
The energy required to provide the high pressure high flow air into the system would be way too much to provide without the use of a very large compressor and would be very inefficient. Aircrafts already have this source of air from the compressor stage of the jet engine. Noise would also be an issue.
Does that really work? The plastic hoses look like they would blow off or melt with the bleed air temperature, there is relatively high pressures and flows inside an aircraft PAC??
This one is a mock up with fewer moving parts,not as robust as the real ACM, although those hoses seem more brittle than they actually are.
Sorry, but how does the air get cooled again? By extracting water and drying it out? Lots of talk about heating and reheating, but HOW does the air become cool?
When you compress, air heats. The air cycle machine does the opposite, it allows hot air to expand and cool in the expansion chamber. Before that happens the air would have already processed thru the heat exchanger that would make the first cooling impact over hot bleed air from the engine. Please refer to the lesson that talks about secondary heat exchanger.
the ACM here is training model which functions on same basic principle as actual aircraft ACM except that it won't show you the actual engine attached to a wing.
This was a good example of an ACM layout, but not a good lesson on HOW it works.
As he did mention (briefly) temperature does whatever pressure does...
Px goes up.... Temp goes up.
Px goes down... Temp goes down.
Let's call this rule 1
The other important thing is that you can change temperature without effecting pressure much at all.
Lets call this rule 2
Let's not get into the numbers, just imagine a scale from very low to very high.
Air the plane is flying through...... px=v.low, temp=v.low
Air goes into the engine compressor and into the bleed valve... px=high, temp=high (rule 1)
Air passes through primary heat exchanger..... px=high, temp=medium (rule 2)
Air goes through compressor of ACM...... px=v.high, temp=high (rule 1)
Air passes through secondary heat exchanger.... px=v.high, temp=medium (rule 2)
Air uses all that pressure to drive the turbine of the ACM, then empties out into a larger volume....px=medium, temp=v.low (rule 1)
Now you have very cold air at a useful pressure.
You can now mix it with hot air from the start of the cycle to get the temperature you want.
It can now enter the cabin at a constant rate, you then vary the rate that it leaves the outflow valve and that's how you can adjust cabin pressure too!
Hope that helps.
anyone know which air cycle machine is usedx by Boeing 757?
So this aircraft air conditioning system doesn’t require the gas used in domestic-like ACUs? Is it because of the constant ramming air that the aircraft is constantly receiving?
This process follows the brayton cycle not the Carnot/refrigeration cycle - no refrigerant is required
I still don’t see where the system can cool cabin air much below outside ambient temperature when you’re on the ground. Like, in a car, I understand where the refrigerant goes from a high temp and high pres liquid to a low pressure vapor (that is very cold) at the orifice tube, and after. But where is something like that happening here?
You are overthinking it. When on ground the exact same process occurs but the hot high pressure comes from the APU instead of the jet engines
مهندس خالد❤
GREAT
I want to study air craft Air conditioning can you give some Institute name for study
GREAT!!
Hey could you provide me where did you get the turbocompressor? I really need one
❤❤❤❤❤
Thank you for this video! Mr. Khalid explained the topic in a concise yet very informative way! This video helped me a lot. Hoping for more videos like this. Thank you!
I am grateful to IATC such excellent demonstration of ACM and best ways to make student around the globe understand system although if you just try to isolate the air conditioning sound from the video it will be the best
O2 percentage doesn’t change with altitude. Just the partial pressure.
5:23 LMAO sorry that stutter
Thank you for making such a good vedio... Please make more
انستركتر علي الخويطري الله يدب في قلبك الرعب وخسائر الوقت على كثر اسلوب الاحراج وترهيب وتحشير في الاسئله في اي شرح لدرجه فقدت الشغف في مجال طيران الله لا يسامحك على وقت اللي قضيته في كلاساتك واشكر شرح انستركتر خالد على شرحه المفهوم والبسيط والذي لخصه العملية كلها بـ10 دقائق عكس الانستركتر علي 40 دقيقة
We need mr Khalid again please he is best one explained the aircond system ever
Thanks alot.
Very well explained
How about mixer unit?? I did not hear information about mixer unit
of course, mixer unit lesson plan will be taken up for upload following an intervening video which is being created as of now.
Very nice explanation. How can i access the system for further learning in my college
Condenser?
Welcome to Somalia
Nice thank you
May I please have the list of components used to demonstrate the air cycle machine?
if you go thru the video you will easily the make that list.
how the input of the air is simulated for the initial compression of air?
What do they do with the water from the water separator
use it for the heatexchaners. it helps to cool air more
To the outflow duct
Overboard
Walter collected is dumped overboard
automaticly
Very nice
Great explanation of the ACM. Thank you for posting!!
Better than the BCIT teaching.....
Well said