Mixing bleed and ram air using a two turbine architecture with an outflow heat exchanger
An airplane is provided. The airplane includes a first medium at a first pressure, a second medium at a second pressure, a third medium at a third pressure; and an air conditioning system. The air conditioning system includes a compressor, a first heat exchanger configured to transfer heat from the first medium to the third medium, a second heat exchanger configured to reject heat from the first medium, a third heat exchanger configured to reject heat from the second medium, a first turbine configured to receive the first medium, and a second turbine configured to receive the second medium.
1. An airplane comprising:
a first medium at a first pressure;
a second medium at a second pressure;
a third medium at a third pressure; and
an air conditioning system comprising:
a compressor,
a first heat exchanger configured to transfer heat from the first medium to the third medium,
a second heat exchanger configured to reject heat from the first medium,
a third heat exchanger configured to reject heat from the second medium,
a first turbine configured to receive the first medium, and
a second turbine configured to receive the second medium,
wherein the first medium comprises fresh air compressed by the compressor.
2. The airplane of claim 1 , wherein the first heat exchanger is downstream of the compressor.
3. The airplane of claim 2 , wherein the second heat exchanger is downstream of the first heat exchanger.
4. The airplane of claim 3 , wherein the first heat exchanger is upstream of the first turbine.
5. The airplane of claim 1 , wherein the second medium comprises pressured air sourced from a pressurized volume.
6. The airplane of claim 5 , wherein the third heat exchanger is configured to receive the pressured air.
7. The airplane of claim 6 , wherein the third heat exchanger is upstream of the second turbine.
8. The airplane of claim 7 , wherein the first and second medium mix downstream of the second turbine.
9. The airplane of claim 1 , wherein the third medium comprises cabin discharge air.
10. An airplane comprising
a first medium at a first pressure;
a second medium at a second pressure;
a third medium at a third pressure; and
an air conditioning system comprising:
a compressor,
a first heat exchanger configured to transfer heat from the first medium to the third medium,
a second heat exchanger configured to reject heat from the second medium,
a first turbine configured to receive the first medium and the third medium, and
a second turbine configured to receive the second medium,
wherein the first medium comprises fresh air compressed by the compressor.
11. The airplane of claim 10 , wherein the first heat exchanger is downstream of the compressor.
12. The airplane of claim 11 , wherein the first heat exchanger is upstream of the first turbine.
13. The airplane of claim 10 , wherein the second medium comprises pressured air from a pressurized volume.
14. The airplane of claim 13 , wherein the second heat exchanger is configured to receive the pressured air.
15. The airplane of claim 14 , wherein a third heat exchanger of the air conditioning system is upstream of the second turbine.
16. The airplane of claim 15 , wherein the first and second medium mix downstream of the second turbine.
17. The airplane of claim 1 , wherein the third medium comprises cabin discharge air.