# US 2022/0033084 A1 · Aircraft environmental control system

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- Number: US 2022/0033084 A1
- Document ID: US20220033084A1
- Status: Published application
- Kind: A1
- Application number: 17/390,077
- Filed: 2021-07-30
- Published: 2022-02-03
- Earliest claimed: 2020-07-30
- Assignees: Hamilton Sundstrand Corporation
- Applicants: Hamilton Sundstrand Corporation
- Inventors: Louis J. Bruno; Tony Ho; Aiden Coutin
- Web page: https://patentgrep.com/patent/US20220033084A1

## CPC

- B64D 13/08: the air being heated or cooled
- B64D 13/06: the air being conditioned (pressurising B64D13/02)
- F25B 9/004: {the refrigerant being air}
- F25B 9/06: using expanders (F25B9/10 takes precedence)
- B64D 2013/0618: {with arrangements for reducing or managing bleed air, using another air source, e.g. ram air}
- B64D 2013/064: {comprising more than one system, e.g. dual systems}
- B64D 2013/0648: {with energy recovery means, e.g. using turbines}
- B64D 2013/0662: {with humidity control}
- B64D 2013/0688: {with means for recirculating cabin air}
- Y02T 50/50: On board measures aiming to increase energy efficiency
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A compressing device for use in an environmental control system includes at least one turbine configured to provide energy by expanding one or more medium. The one or more mediums provided at an outlet of the at least one turbine form a heat sink within the environmental control system. A compressor is configured to receive energy from the one or more mediums expanded across the at least one turbine. During a first mode of the compressing device, energy derived from a first medium of the one or more mediums is used to compress a second medium at the compressor and during a second mode of the compressing device, energy derived from both the first medium and a third medium of the one or more mediums is used to compress a second medium at the compressor.

## Claims

### Claim 1

A compressing device for use in an environmental control system comprising:
at least one turbine configured to provide energy by expanding one or more mediums, wherein the one or more mediums provided at an outlet of the at least one turbine form a heat sink within the environmental control system; and
a compressor configured to receive energy from the one or more mediums expanded across the at least one turbine, wherein during a first mode of the compressing device, energy derived from a first medium of the one or more mediums is used to compress a second medium at the compressor and during a second mode of the compressing device, energy derived from both the first medium and a third medium of the one or more mediums is used to compress a second medium at the compressor.

### Claim 2 (depends on 1)

The compressing device of claim 1, wherein the at least one turbine includes a first turbine configured to receive and extract work from the first medium and a second turbine configured to receive and extract work from the third medium.

### Claim 3 (depends on 2)

The compressing device of claim 2, wherein the first medium and the third medium are mixed together downstream from both the first turbine and the second turbine.

### Claim 4 (depends on 2)

The compressing device of claim 2, wherein the first turbine and the second turbine are arranged in series such that the second turbine is also configured to receive and extract work from the first medium.

### Claim 5 (depends on 4)

The compressing device of claim 4, wherein the first medium and the third medium are mixed together upstream from an inlet of the second turbine.

### Claim 6 (depends on 5)

The compressing device of claim 5, wherein the first medium and the third medium are mixed together downstream from an outlet of the first turbine.

### Claim 7 (depends on 2)

The compressing device of claim 2, wherein the first turbine and the second turbine are located at opposite ends of the shaft.

### Claim 8 (depends on 2)

The compressing device of claim 2, wherein the first turbine is positioned adjacent a first end of the shaft and the compressor is positioned adjacent a second end of the shaft.

### Claim 9 (depends on 1)

The compressing device of claim 1, wherein the at least one turbine includes a first nozzle for receiving the first medium and a second nozzle for receiving the third medium.

### Claim 10 (depends on 1)

The compressing device of claim 1, wherein the first medium is bleed air.

### Claim 11 (depends on 1)

The compressing device of claim 1, wherein the second medium is fresh air.

### Claim 12 (depends on 1)

The compressing device of claim 1, wherein the third medium is cabin air.