Air Refrigeration systems

1- air is used as the Refrigerant in a mechanical compression system2- Air remains in a gaseous state throught the cycle ( monophase cycles)3- Most of the systems are open systems.

Bootstrap Sytem

1- Air is discharged from the turbine at a pressure > cabin pressure2- FAN : located in the downstream side to avoid additional temperature rise of the

ram cooling air.3- ACM : to provide addetional cooling capacity when the primary source of air

does not have sufficient presure ( flow ) . this accomplished on the expense of drag in the cooling circuit .

EQUIPMENT COOLING

I)CONTINOUS COOLING (AVIONICS VENT SYST)

Blower exahust AMBIENT AMB.

INLET VLV. OUTLET VLV.

II)CONTROLLED COOLING(GCU)

AVIONICS Compt.

CONTROLLER

Blower exahust Amb.

outlet vlv.

GCU GCUInlet vlv Exhaust vlv Blower Amb.

GROUND COOL UNIT

Ram air

Amb.

AVIONICS Compt.

GCUGCU

GCU Controller

Ctl Panel

condenser evaporator

Liquid receiver

Exp vlv

compressor

freon

Ram airCooled air