Reduced Ambient Air Cooling System

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What is Reduced Ambient Air Cooling System?

The reduced ambient air cooling system consists of one heat exchanger and two cooling turbines. The air diminishes in this refrigeration system from the fundamental compressor. First, high-temperature and high-pressure air cools in the heat exchanger. The air, from the cooling turbine, goes for further ramming of air. The air coming out of the heat exchanger enters the second cooling turbine for more cooling. And air enters the cabin. The work of the cooling turbine is to drive the cooling fan. It draws cooling air from the heat exchanger. This air cooling system is utilized for exceptionally rapid airplanes.

Working of Cooling System

Reduced Ambient Air cooling system

  • 1-2 represents isentropic ramming of air.
  • 1-2′ represents the actual ramming of air because of internal friction.
  • 2′-3 represents isentropic compression in the main compressor.
  • 2′-3 represents actual compression of air.
  • 3′-4 represents the cooling of compressed air by ramming. The air flows from the cooling turbine to the heat exchanger. Neglects the pressure drop.
  • 4-5 represents isentropic expansion of air in the second cooling turbine till the cabin pressure.
  • 4-5′ represents the actual expansion of the air.
  • 5′-6 represents the heating of air until the cabin temperature T6.

Capacity of Cooling System

Reduced ambient air cooling ts

Q tonnes of refrigeration is the cooling load in the cabin. The quality of air requires for the refrigeration purpose will be

ma = 210 Q / Cp ( T6 – T5′) Kg/min

Power of the refrigeration system isĀ 

P = maCp ( T3′ – T2′) / 60 kW

C.O.P of the system = 210Q/ P x 60


You can also find the attached Pdf. Click on the link below

Reduced Ambient Air Cooling System pdf



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