Environmental control system utilizing cabin air to drive a power turbine of an air cycle machine and utilizing multiple mix points for recirculation air in accordance with pressure mode
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Solution Overview
Problem
Current aircraft air conditioning systems require high engine pressures for cabin pressurization and cooling, which results in limited fuel efficiency due to increased engine fuel burn.
Innovation Solution
An environmental control system that utilizes a compressing device and heat exchangers to boost the pressure of low-pressure engine bleed air, supplemented by a turbine using cabin air for additional power, to efficiently provide cabin pressurization and cooling while minimizing fuel burn.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If high engine bleed pressures are used for cabin pressurization and cooling, then sufficient pressure for cabin functions is achieved, but engine fuel burn increases
Solution Approach 1:
The system divides the air supply into two separate sources: high-pressure air from the engine bleed system is used solely for cabin pressurization, while low-pressure air from the engine inlet is used for air conditioning. This segmentation allows each air source to be optimized for its specific function, eliminating the need to use high-pressure air for both purposes and thereby reducing engine fuel burn.
Solution Approach 2:
A compressor acts as an intermediary device that takes low-pressure air from the engine inlet and compresses it to the required pressure for air conditioning. This intermediary mechanism enables the system to use low-pressure air (which would otherwise be wasted) and convert it into usable high-pressure air for cooling, without requiring high-pressure bleed air from the engine.
2Use of energy by moving object
If low-pressure engine bleed air is used, then engine fuel burn efficiency improves, but insufficient pressure is available for cabin pressurization and cooling
Solution Approach 1:
The system divides the air supply into two separate sources: high-pressure air from the engine bleed system is used solely for cabin pressurization, while low-pressure air from the engine inlet is used for air conditioning. This segmentation allows each air source to be optimized for its specific function, eliminating the need to use high-pressure bleed air for both purposes and thereby reducing engine fuel burn.
Solution Approach 2:
The system changes the pressure parameter of the air used for air conditioning by using low-pressure air from the engine inlet instead of high-pressure bleed air. A compressor then transforms this low-pressure air into the required pressure level, allowing the system to operate with improved fuel efficiency while still meeting the pressure requirements for air conditioning.
3Adaptability or versatility
If high-pressure air is used for both pressurization and cooling, then all cabin functions are satisfied, but device complexity increases due to additional compression requirements
Solution Approach 1:
The system divides the air supply into two separate sources: high-pressure air from the engine bleed system is used solely for cabin pressurization, while low-pressure air from the engine inlet is used for air conditioning. This segmentation allows each air source to be optimized for its specific function, eliminating the need to use high-pressure bleed air for both purposes and thereby reducing engine fuel burn.
Solution Approach 2:
The compressor serves multiple functions: it compresses low-pressure air for air conditioning, and its exhaust provides additional high-pressure air for cabin pressurization. This multi-functionality reduces the overall system complexity by eliminating the need for separate compression systems for each function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves high engine fuel burn efficiency by leveraging low-pressure engine bleed air and cabin air to maintain sufficient pressure for cabin pressurization and cooling, reducing fuel consumption without compromising performance.
Implementation Method 1
at least one heat exchanger located downstream of the compressor
Implementation Method 2
utilizing a compressing device and heat exchangers to boost the pressure of low-pressure engine bleed air, supplemented by a turbine using cabin air for additional power
Data Source
AI summary
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; 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.