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How Does The Air-Conditioning System Work?  
User currently offlineUnited Airline From Hong Kong, joined Jan 2001, 9107 posts, RR: 15
Posted (12 years 10 months 6 days 17 hours ago) and read 15828 times:

Hey guys!

I am beginning to wonder how does the Air-Conditioning system of an Aircraft work?

Do they have an Oxygen Tank for oxygen supply? Or do they simply take-in Air from the Air, warm them a bit to room temperature and supply it to the Cabin?

7 replies: All unread, jump to last
 
User currently offlineAmerica West From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 10 months 6 days 17 hours ago) and read 15800 times:

>>...simply take-in Air from the Air...<<

 Smile/happy/getting dizzy

It is recirculated during flight (that's all I know Smile)


User currently offlineDC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 2
Reply 2, posted (12 years 10 months 6 days 17 hours ago) and read 15798 times:

I feel like I'm being set up, but here is one example: http://extender1.tripod.com look under DC-10 and systems explained. JT, not one word.


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User currently offlineUnited Airline From Hong Kong, joined Jan 2001, 9107 posts, RR: 15
Reply 3, posted (12 years 10 months 6 days 16 hours ago) and read 15795 times:

So, does the plane take-in air during flight?

User currently offlineJT-8D From United States of America, joined Dec 2000, 423 posts, RR: 3
Reply 4, posted (12 years 10 months 6 days 16 hours ago) and read 15785 times:

There was a post on this a week or so ago. Several good descriptions were given..JT

User currently offlineDC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 2
Reply 5, posted (12 years 10 months 6 days 16 hours ago) and read 15781 times:

The Cabin Air comes from the engines. It is bled from the engine compressors and ducted through the air conditioning system and then into the plane. The air being forced into the cabin is let out slowly through the pressurization outflow valve. The cabin pressure is then maintained by regulating how fast the air is let out of the cabin.


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User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 6, posted (12 years 10 months 6 days 16 hours ago) and read 15781 times:

Air for Pneumnatic Air Conditioning operation is bled off from various stages of the engines compressors. This compressed and very hot air (500 degrees C) is then sent through a pre cooler (heat ecxhanger) to lower the temperature before sending it into the PAC compressor.

The PAC turbo compressor compresses the pre cooled air heating it up again. It then goes through another heat exchanger dropping the temperature before entering an expansion turbine. As the air expands in the expansion turbine it cools very rapidly. This cold air leaves the expansion turbine and supplies the cockpit temperature controlled mix valve with cold air.

The hot air for the mix valve comes directly off the engine bleed after it has ben pre cooled. The wrarm air supplied to the mix valve is bled after the PAC compressor but before the expanson turbine. The position of this mix valve determines the temperature of the air enetering the cabin.

JET



User currently offlineSpeedbird001 From United Kingdom, joined May 2000, 30 posts, RR: 0
Reply 7, posted (12 years 10 months 6 days 4 hours ago) and read 15771 times:

This subject has been discussed many times previously - try searching the forums. Also, alot if interesting info on the AC systems on Boeing A/craft can be found on http://www.boeing.com/commercial/cabinair/
A simple description can be found, but if you go to "System description (PDF)" link, a PDF file explains the system with the help of diagrams. - Very good explinations.
Hope this helps
Concorde speedbird 001 - fly again soon


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