Dual turbine bootstrap cycle environmental control system

An environmental control system comprising:

• an air conditioning machine comprising a first turbine, a second turbine and a compressor;
• a condenser in communication with an outlet from said first turbine;
• a water collector in communication with said condenser;
• a first liquid cycle subsystem comprising a first air-to-liquid heat exchanger in communication with said water collector and an inlet to said first turbine;
• a first heat load in heat exchange relationship with said first liquid cycle subsystem;
• an outlet of said condenser in communication with an inlet of a reheater, and an outlet of said reheater in communication with an inlet of said second turbine;
• a second liquid cycle subsystem comprising a second air-to-liquid heat exchanger in communication with an outlet of said second turbine;
• and
• a second heat load in heat exchange relationship with said second liquid cycle subsystem.

A method of conditioning water vapor bearing bleed air for supply as conditioned air comprising the steps of:

• (1) communicating a bleed air to a reheater to extract thermal energy from the bleed air;
• (2) condensing the bleed air after said step (1);
• (3) extracting water from the bleed air after said step (2) such that the bleed air is dehumidified;
• and
• (4) communicating the dehumidified bleed of said step (3) air through an air-liquid heat exchanger of a first liquid cycle subsystem such that the dehumidified bleed air recovers thermal energy from the first liquid cycle subsystem.

A method of conditioning water vapor bearing bleed air for supply as conditioned air comprising the steps of:

• (1) communicating a bleed air to a compressor;
• (2) compressing the bleed air;
• (3) communicating the compressed bleed air through an air-to-air heat exchanger to extract thermal energy from the bleed air;
• (4) communicating the bleed air from the air-to-air heat exchanger to a reheater to extract thermal energy from the bleed air;
• (5) condensing the bleed air after said step (4);
• (6) extracting water from the bleed air after said step (5) such that the bleed air is dehumidified;
• (7) communicating the dehumidified bleed air through an air-liquid heat exchanger of a first liquid cycle subsystem such that the dehumidified bleed air recovers thermal energy from the first liquid cycle subsystem;
• (8) communicating the dehumidified bleed air to a first turbine;
• (9) expanding the bleed air in the first turbine such that the expanded bleed air is above freezing;
• (10) communicating the expanded bleed air from said step (9) through the condenser such that the expanded bleed air recovers thermal energy from the condenser;
• (11) communicating the expanded bleed air from said step (10) through a reheater such that the expanded bleed air recovers thermal energy from the reheater;
• and
• (12) communicating the expanded bleed air to a second turbine.