Aircraft Ram Air Circuit Using Cabin Outflow for Pressurization
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Solution Overview
Problem
Aircraft environmental control systems face inefficiencies in fuel burn and energy usage, as current systems rely on bleed air and high engine pressure, which can be improved by utilizing electrical power and cabin outflow energy to compress outside air for better performance.
Innovation Solution
An environmental control system for aircraft that incorporates a ram air circuit with heat exchangers and a dehumidification system, using a combination of bleed air, fresh air, and cabin discharge air to power the system, with a compression device that includes turbines and a compressor to optimize energy usage and reduce fuel burn.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bleed air is used to power the environmental control system, then the system can provide cabin pressurization and cooling, but fuel burn increases
Solution Approach 1:
The system uses cabin outflow air (a waste resource) to drive the turbine, which powers the compressor to provide cabin pressurization. This self-service approach eliminates the need for bleed air from engines, reducing fuel burn while maintaining cabin pressurization capability
Solution Approach 2:
The system recovers energy from cabin outflow air that would otherwise be discarded. The outflow air drives the turbine to generate mechanical power, which is then used to compress outside air for cabin pressurization, converting waste energy into useful work
2Use of energy by moving object
If electrical power is used to compress outside air, then fuel burn is reduced, but system complexity increases
Solution Approach 1:
The system uses pneumatic principles where cabin outflow air drives a turbine connected to a compressor. This mechanical pneumatic system replaces electrical compression, reducing fuel burn while avoiding the complexity of electrical power systems in the aircraft environment
3Reliability
If higher engine pressure is used, then cabin pressurization is improved, but fuel consumption increases
Solution Approach 1:
The system generates its own compression power using cabin outflow air driving the turbine. This eliminates dependence on high engine pressure and bleed air, reducing fuel consumption while maintaining effective cabin pressurization through the self-powered compression cycle
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
This system achieves high fuel burn efficiency by mixing and utilizing different air sources to power the environmental control system, providing efficient cabin pressurization and cooling while reducing fuel consumption.
Implementation Method 1
a ram air circuit including a ram air shell having at least one heat exchanger positioned therein
Implementation Method 2
The first medium is provided to a turbine of the compression device and expanded across the turbine to provide work to a compressor of the compression device
Implementation Method 3
the compressed second medium is provided to the second heat exchanger
Data Source
AI summary
An environmental control system of an aircraft includes a ram air circuit including a ram air shell having at least one heat exchanger positioned therein and a divider arranged within the ram air shell to separate the ram air shell into a first region and a second region. The at least one heat exchanger is arranged within both the first region and the second region. A first medium is configured to flow through the first region and a second, distinct medium is configured to flow through the second region. The environmental control system additionally includes a dehumidification system arranged in fluid communication with the ram air circuit and a compression device arranged in fluid communication with the ram air circuit and the dehumidification system.