Pressurised cabin in aircraft. How does this actually work?

Answer 1

Compressed air from the engines, (called engine bleed air), is sent through an air conditioning unit, or air cycle machine at a fairly constant rate, then introduced into the cabin. Pressure relief valves, called outflow valves, open and close to regulate the air pressure inside the cabin to keep the pressure (and oxygen levels) at or near what they would be at 8,000 feet above sea level.

Answer 2

An aircraft cabin is a closed space that is pumped up by the aircrafts air-cycle machine. It like sitting in a metallic balloon. The way it works is the heater vents exhaust into the cabin but there is no where the air can escape except though an outflow valve which is controlled by a computer. If you close the outflow valve - the pressure goes up - simple. The reason for the need of a pressurize cabin is because without the partial pressure of oxygen to force the oxygen molecules into you lunges - your lungs would not be able to take up the oxygen in the cabin - therefore - yes - those little oxygen masks do not work unless the cabin is pressurized ..unles the pilots decends to lower altitude.

Answer 3

Well try something for me, run a bath with one tap very slowly the water runs into the bath and out of the plug hole. Turn on both taps fully and the water still runs out of the plug hole but this time the bath starts to fill. Because the water rushing in is greater than the capacity of the plug hole to drain it out.

In a similar way an aircraft cabin has a rush of air coming in grater that can escape, this causes the fuselage to pressurise. This is regulated by additional relief valves (more plug holes) to balance the cabin at a given altitude.

Answer 4

The answer of Jet Doc is absolutely correct. Here I would like to add that as the altitude increases the air becomes thin and the human body does not get the required oxygen from this air. Also the passengers feel comfortable if the surrounding air is as dense as it is on the ground. So the cabin is maintained at about atmospheric pressure at ground level.

Answer 5

When the cabin doors are closed, the aircraft has to be pressurised to compensate for the rarefied atmosphere it encounters as its height increases. Contrary to some belief, when the cabin is pressurised, the cabin doors, locked when the aircraft was on the ground, are not able to be opened. I know this because some years ago, I was in an aircraft when one passenger tried to do this over the Pyrenees. He was arrested in Cardiff when we made an emergency landing.

Answer 6

Cooling the cabin and pressurizing them is for diverse motives. Pressurization is so the passengers can breath. At alt there's a lot less O2 interior the air and subsequently human beings pass into hypoxia. The plane can fly (in tact) without being pressurized without issues. we've military plane that fly unpressurized nevertheless at present. Cooling the air is going to be for passenger convenience, yet I absolutely were on planes at the same time as at altitude we are operating the nice and cozy temperature because the exterior air temp is so low. The plane does no longer have an impressive quantity of insulation so as that chilly air cools the cabin without delay. Does this help any?

Answer 7

Buy passage aboard Trans-Atlantic aircraft and take a window seat. Do not don seat-belt as instructed. Ask to be notified when cabin has risen to altitude when pressurisation is required. Thinner air of altitude increases speed, allows flight above some bad weather, and may ride jet stream to increase fuel savings. The cabin is a bubble which will bleed away quickly if structure containment isn't secure. Should your window pop out into an empty sky the reader won't thank me due lack of any restraint.

Answer 8

Its a purge air system. Air is blown into the cabin expelling fumes carbon dioxide etc. making sure exhaust or fuel fumes from engine do not enter the living space. This air is blown in at a given rate say 100 cubic feet per minute. The air can only escape the aircraft at a given rate which causes a back pressure. This back pressure is measured by a pressure switch with an upper and lower limit. When the upper limit is reached it will cut the blower when the lower limit is reached it may put on an auxilliary blower or turn up the existig blower to maintin a positive pressure of say 6 millibars.

Answer 9

the cabin pressure is controlled by the cabin pressure control valve.the aircraft is fulled pressure sealed and the pressure is maintained by the pressure control valve by sucking pressure from the engine or releasing from the cabin.

Answer 10

the pressure that is added to the cabin is not felt by you. the cabin of an aircraft is filled with oxygen air mix so you will be able to breath at 40,000 feet in the air where there isn't any to breath