Environmental control system utilizing multiple mix points for recirculation air in accordance with pressure mode
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Solution Overview
Problem
Current air conditioning systems in aircraft require high engine bleed pressures for cabin pressurization and cooling, which results in limited efficiency and increased engine fuel burn, contradicting the aerospace industry's trend towards more efficient aircraft designs.
Innovation Solution
An environmental control system that utilizes bleed pressures near cabin pressure, combined with recirculation air mixing at different locations, to provide efficient cabin pressurization and cooling, incorporating heat exchangers and a compressing device to manage pressure and temperature effectively, reducing fuel burn while maintaining efficient air conditioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high engine bleed pressures are used for cabin pressurization and cooling, then cabin pressurization and cooling are achieved, but engine fuel burn increases
Solution Approach 1:
The system divides the air conditioning function into multiple mix points along the airflow path, allowing different portions of recirculation air to be mixed with fresh air at different locations. This segmentation enables more flexible pressure management and reduces the need for high bleed pressures throughout the entire system.
Solution Approach 2:
The system changes the pressure parameter by using a compressing device to increase the pressure of recirculation air to match cabin pressure requirements. This allows the use of lower pressure bleed air from the engine while still achieving the required cabin pressurization, thereby reducing fuel consumption.
2Loss of energy
If recirculation air is mixed at multiple locations, then fuel burn efficiency improves, but system complexity increases
Solution Approach 1:
The air conditioning system is divided into multiple mix points where recirculation air is combined with fresh air at different locations along the airflow path. This segmentation allows for optimized pressure and temperature management at each stage, improving overall fuel efficiency while distributing the system's functional complexity across multiple manageable zones.
Solution Approach 2:
The system incorporates dynamic control through multiple mix points that can adjust the proportion of recirculation air mixed at different locations based on operational conditions. This dynamic approach allows the system to optimize fuel efficiency across varying flight conditions while managing complexity through adaptive rather than static design.
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 using low-pressure bleed air, compressing it as needed, and mixing it with recirculated air to maintain cabin pressure and temperature, thereby reducing fuel consumption and enhancing operational efficiency.
Implementation Method 1
one or more heat exchangers. A medium, bled from a low-pressure location of an engine, flows through the one or more heat exchangers into a chamber
Implementation Method 2
a compressing device. A medium, bled from a low-pressure location of an engine, flows through the one or more heat exchangers into a chamber
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A system is provided. The system includes an air conditioning pack; a first medium; a second medium; a first mixing point located outside the air conditioning pack and configured to mix the first medium with the second medium; and a second mixing point located inside the air conditioning pack and configured to mix the first medium with the second medium.