Energy flow of an advanced environmental control system

1. A compressing device, comprising:

a first turbine operable to receive a first medium and a second medium independently, a first energy provided by expanding athe first medium across the first turbine and a second energy provided by expanding athe second medium across the first turbine; and

a second turbine configured to provide a third energy by expanding a third medium;

a compressor configured to:

receive the first energy and the second energy during a first mode of the compressing device,

receive the first energy during a second mode of the compressing device, and receive the third energy from the second turbine during one of the first mode and the second mode of the compressing device; and

compress the second medium in accordance with the first mode or the second mode; and

a heat exchanger arranged upstream from the second turbine relative to a flow of the third medium, wherein the third medium is heated within the heat exchanger;

wherein the first medium and the second medium are mixed at the turbine during the first mode at a first mixing point, and wherein the first medium and the second medium are mixed downstream of the turbine during the second mode at a second mixing point.

2. The compressing device of claim 1 , comprising:

a fan configured to receive:

the first energy and the second energy during the first mode, and

the first energy during the second mode.

3. The compressing device of claim 1 , comprising:

a first component comprising the first turbine, the second turbine, and the compressor; and

a second component, which is separate from the first component, comprising a fan, a third turbine, and a shaft.

4. The compressing device of claim 3 , wherein the fan is driven via the shaft by the first medium expanding across the second turbine.

5. The compressing device of claim 4 , wherein the fan is driven via the shaft by the first medium expanding across the second turbine.

6. The compressing device of claim 1 , comprising:

a first component comprising the first turbine, the second turbine, and the compressor; and

a second component, which is separate from the first component, comprising a fan driven by a motor.

7. The compressing device of claim 1 , wherein the second turbine comprises a dual entry turbine configured to operate as a power turbine during a second mode by expanding a third medium to provide a third energy to the compressor.

8. The compressing device of claim 7 , comprising:

a first component comprising the first turbine, the second turbine, and the compressor; and

a second component, which is separate from the first component, comprising a fan, a third turbine, and a shaft.

9. The compressing device of claim 7 , comprising:

a first component comprising the first turbine, the second turbine, and the compressor; and

a second component, which is separate from the first component, comprising a fan driven by a motor.

10. The compressing device of claim 1 , comprising:

a first component comprising the turbine and the compressor; and

a second component, which is separate from the first component, comprising a fan driven by a motor.

11. A compressing device, comprising:

a first turbine configured to receive and expand a first medium;

a second turbine configured to receive and expand a third medium; and

a compressor configured to:

receive a first energy from the expansion of the first medium by the first turbine, and

compress a second medium using the first energy; and

a fan configured to receive a third energy from the expansion of the third medium by the second turbine; and

a heat exchanger arranged upstream from the first turbine relative to a flow of the first medium and directly downstream from the compressor relative to a flow of the second medium, wherein the first medium is heated within the heat exchanger;

wherein the first medium and the second medium are mixed at a first mixing point during a first mode and the first medium and the second medium are mixed at a second mixing point during a second mode, one of the first mixing point and the second mixing point being at the first turbine.

12. The compressing device of claim 11 ,

wherein the compressor is configured to receive a second energy from a the second medium expanded across the first turbine.