Why is it important to limit the amount of air bled from the compressor for cooling.?

Question

And what is the componet called that increses the amount of air available for cooling without bleeding more from the engine and how does that work.

Answer 1

If it is bleed air for cabin airconditioning you are talking about, Paul is right.

bleed air is used for several purposes on several aircraft. Some for A/C, some for ice de-icing, (wings and stabilizers).

Some for most Hydraulic systems, pneumatic systems, etc...

Answer 2

Wouldn't want to blow out any ducts or seals. It's that important.

Answer 3

the air that comes off the compresor is very hot, its main use is to warm the cabin and secondarily to keep it pressurised.

It is of course much too hot for cabin use, so it goes through a heat exchanger, usually a turbo type, this uses the airflow to drive a second fan, thereby slowing the air and dumping some of the energy. The driven turbine can be used to pull in ambient air and compress it up to the cabin pressure ( turbo compressor ), or just used as a brake ( turbo braked)on the less sophisticated types. The air pulled in on the turbo compressor type is sometimes also used to blow over a heat exchanger matrix and cool the engine bleed air. This is sometimes called a bootstrap system, the system pulling itself up by its own boots. The use of hot air deicing is less common now, since it meant large diameter hot pipe work running all over the place, (as the Nimrod crew found out over Afghanistan, hot air isnt always safe.) electrical deicers are simpler to install and control.

so the answer to your question would probably be the turbo compressor of the ACU, And the cabin pressure controller is the item that lets the airline keep the air foul to save fuel costs by not cycling the air through the aircraft so much

Answer 4

The more air that is bled from the compressor for cooling, the less power you will get from the engine.  Less power means less payload and range.

I'm assuming you mean cabin cooling.  The air that is bled off is normally controlled by a calibrated bleed.  Once the air is bled off, it is then cooled by means of heat exchangers and turbines (increased velocity, decreased temp.).  The amount of cooling or heating from then on is controlled by a thermostatic system.  The amount of air bled off doesn't change.

Answer 5

Answering the first part of your question: If too much air is bled off for customer use or for engine systems, the risk of a deep stall or surge, causing damage to compressor blades is possible.  However, air is needed to be bled off of the H.P. sector of an axial compressor at start-up to stop the compressor chokeing.  This is normally bled off to atmosphere.  Unsure what you are refering to in the second part - sorry.