Aircraft environmental control system
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Solution Overview
Problem
Current aircraft environmental control systems face inefficiencies in fuel burn due to reliance on bleed air, and there is a need for systems that can efficiently mix and utilize different air sources for cabin pressurization and cooling while reducing fuel consumption.
Innovation Solution
An environmental control system that combines bleed air and fresh air, utilizing a compression device with a turbine and heat exchangers to mix and process these air sources, extracting work from cabin discharge air to enhance efficiency, and operating in various modes to optimize fuel usage based on flight conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bleed air is used to power the environmental control system, then the system can operate with established technology, but fuel burn increases
Solution Approach 1:
The patent combines multiple air sources (bleed air and fresh air) into a single turbine inlet, allowing the system to utilize both sources simultaneously or alternatively to drive the compression device, thereby reducing reliance on bleed air alone and improving fuel efficiency
Solution Approach 2:
The system changes the operational parameters by allowing variable flow rates from different air sources into the turbine, enabling optimization of the mix between bleed air and fresh air based on flight conditions to minimize fuel consumption while maintaining system operation
2Loss of energy
If electrical power is used to compress outside air instead of bleed air, then fuel burn is reduced, but system complexity increases
Solution Approach 1:
The patent uses pneumatic principles by utilizing the expansion of air through the turbine to drive the compression device, replacing electrical compression with a pneumatic energy conversion system that leverages the available air sources
3Loss of energy
If lower engine pressure is used, then fuel burn is reduced, but cabin pressurization capability is compromised
Solution Approach 1:
The turbine-compression device serves multiple functions: it can compress fresh air for cabin pressurization, cool air through expansion, and adapt to different air source combinations, making the system versatile enough to handle both pressurization and cooling requirements
4Loss of energy
If multiple air sources are mixed and processed, then fuel efficiency is improved, but device complexity increases
Solution Approach 1:
The system segments the air handling process into distinct functional sections: a turbine section for energy extraction, a compression section for pressurization, and heat exchanger sections for temperature control, allowing each segment to be optimized independently
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 fuel burn efficiency by reducing the need for bleed air, mixing air sources to provide effective cabin pressurization and cooling, and operating in multiple modes to adapt to different flight conditions, thereby improving airplane efficiency and reducing fuel consumption.
Implementation Method 1
a turbine configured to receive the first medium from the first heat exchanger and the second medium from the second heat exchanger
Implementation Method 2
a first heat exchanger configured to receive the first medium and cool the first medium; a second heat exchanger configured to receive the second medium and cool the second medium
Data Source
Figure 1
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AI summary
An environmental control system of an aircraft includes a ram air circuit (30) including a ram air shell (32) having at least one heat exchanger (34, 36) positioned therein, a dehumidification system (52) arranged in fluid communication with the ram air circuit, and a compression device (40) arranged in fluid communication with the ram air circuit and the dehumidification system. The compression device includes a compressor (42), a turbine (44), and a fan (48) coupled by a shaft (50), wherein the fan is operable to move ram air through the ram air circuit and the turbine includes a first inlet for receiving a first flow of medium and a second inlet for receiving a second flow of medium.