TWO SPOOL ENVIRONMENTAL CONTROL SYSTEM

摘要

A two spool environmental control system includes a low pressure spool subsystem (40) having a low pressure turbine (28). A high pressure spool subsystem (39) is in air flow communication with the low pressure spool subsystem (40), while the high pressure spool subsystem (39) is capable of conditioning compressed air prior to the low pressure spool subsystem (40) conditioning the compressed air. The high pressure spool subsystem (39) includes a high pressure turbine (24) which is mechanically operable independently of the low pressure turbine (28).