Environmental control system utilizing multiple mix points for recirculation air in accordance with pressure mode and motor assist
A system is provided. The system includes an inlet providing a first medium; an inlet providing a second medium; a compressing device including a compressor and a turbine; a motor operating on an input power that is less than or equal to 0.5 kilowatts per pound per minute of the first medium compressed; and at least one heat exchanger located downstream of the compressor. The compressing device is in communication with the inlet providing the first medium. The turbine is downstream of the compressor. An outlet of the at least one heat exchanger is in fluid communication with an inlet of the compressor and an inlet of the turbine.
1. A system, comprising:
a first inlet providing a first medium from a source;
a compressing device in communication with the first inlet, wherein the compressing device comprises:
a compressor configured to receive the first medium,
a turbine downstream of the compressor, and
an electric motor configured to drive the compressor when a flow of the first medium bypasses the compressing device; and
at least one heat exchanger, wherein a first outlet of the at least one heat exchanger is in fluid communication with an inlet of the compressor and a second outlet of the at least one heat exchanger is in fluid communication with an inlet of the turbine;
wherein the system is operable in a low pressure mode and a high pressure mode, in said low pressure mode the first medium is mixed with a second medium at a first mixing point located downstream from the compressor and upstream from at least a portion of the at least one heat exchanger; and in the high pressure mode, the first medium is mixed with the second medium at a second mixing point located downstream of the turbine.
2. The system of claim 1 , wherein the first mixing point is upstream from the second outlet of the at least one heat exchanger.
3. The system of claim 1 , wherein in the first mode, a pressure of the medium at the first inlet is more than 1 psi above a pressure of the chamber.
4. The system of claim 3 , wherein in the first mode, a pressure of the medium at the first inlet is up to 2.5 psi below a pressure of the chamber.
5. The system of claim 4 , wherein the pressure of the medium provided to the first inlet when the system is in the second mode is greater than the pressure of the medium provided to the inlet when the system is in the first mode.
6. The system of claim 1 , wherein the at least one heat exchanger comprises a plurality of passes by which the medium flows.
7. The system of claim 6 , wherein the first mixing point is downstream of a first pass of the plurality of passes.
8. The system of claim 1 , wherein the electric motor receives electrical energy to power the compressor when the system is operating in a first mode.
9. The system of claim 1 , wherein the first mode is a boost mode.
10. The system of claim 1 , wherein the first mode is a low pressure mode.
11. The system of claim 1 , wherein electrical energy provided to the electric motor does not exceed 0.5 KW per pound per minute of air received by the compressor.
12. A system, comprising:
a first inlet providing a medium from a source;
a compressing device in communication with the first inlet, wherein the compressing device comprises:
a compressor configured to receive the medium,
a turbine downstream of the compressor, and
an electric motor configured to drive the compressor when a flow of the medium bypasses the compressing device; and
at least one heat exchanger,
wherein the at least one heat exchanger is arranged downstream from an outlet of the compressor with respect to a flow of the medium and comprises a plurality of passes arranged in series with respect to the flow of the medium,
wherein an outlet of a first pass of the plurality of passes is in fluid communication with an inlet of the compressor such that from the outlet of the first pass, the medium is returned to the compressor, and
wherein an outlet of a final pass of the plurality of passes is in fluid communication with an inlet of the turbine.
13. The system of claim 12 , wherein the system is operable in at least two modes comprising first mode and a second mode;
wherein, in the first mode, the medium is mixed with a recirculation medium at a first mixing point; and
wherein, in the second mode, the medium is mixed with the recirculation medium at a second mixing point.
14. The system of claim 13 , wherein the first mixing point is located downstream of the compressor of the compressing device.
15. The system of claim 13 , wherein the first mixing point is downstream of the first pass of the plurality of passes.
16. The system of claim 13 , wherein the second mixing point is downstream of the turbine.
17. The system of claim 13 , wherein in the first mode, a pressure of the medium at the inlet is more than 1 psi above a pressure of the chamber.
18. The system of claim 13 , wherein in the first mode, a pressure of the medium at the inlet is up to 2.5 psi below a pressure of the chamber.
19. The system of claim 13 , wherein the pressure of the medium provided to the inlet when the system is in the second mode is greater than the pressure of the medium provided to the inlet when the system is in the first mode.
20. The system of claim 13 , wherein the electric motor receives power to operate the compressor when the system is operating in the first mode.
21. The system of claim 20 , wherein the first mode is a boost mode.
22. The system of claim 20 , wherein the first mode is a low pressure mode.
23. The system of claim 12 , wherein electrical energy provided to the electric motor does not exceed 0.5 KW per pound per minute of air received by the compressor.