Aircraft Environmental Control System with Two-Stage Moisture Removal
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Solution Overview
Problem
Aircraft environmental control systems face challenges in efficiently mixing bleed air and fresh air while effectively removing moisture, which affects cabin pressurization and cooling efficiency, particularly at varying altitudes and engine conditions.
Innovation Solution
An environmental control system that combines bleed air and fresh air using a ram circuit with heat exchangers and a compressing device, including a turbine and fan, to produce mixed air, while utilizing water extractors and condensers to optimize moisture removal, allowing for bleed air reduction and improved fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If bleed air is used to power the environmental control system, then engine efficiency is improved, but moisture removal becomes more difficult
Solution Approach 1:
The system separates the moisture removal process into two distinct stages: a high-pressure water extractor that removes the majority of moisture before the air enters the turbine, and a low-pressure condenser that removes remaining moisture after expansion. This segmentation allows each component to operate optimally at its respective pressure level, effectively solving the moisture removal challenge while maintaining bleed air efficiency.
Solution Approach 2:
The high-pressure water extractor performs preliminary moisture removal before the air enters the turbine and mixing section. By removing the bulk of moisture upfront at high pressure, the system prevents moisture accumulation problems downstream and reduces the burden on the low-pressure condenser, enabling efficient operation with reduced bleed air usage.
2Productivity
If bleed air usage is reduced to improve fuel efficiency, then fuel burn efficiency is improved, but moisture removal capability is compromised
Solution Approach 1:
The system exploits pressure parameter changes to enhance moisture removal efficiency. The high-pressure water extractor operates at compressor outlet pressure to remove moisture efficiently, then the air expands through the turbine to low pressure where the condenser removes remaining moisture. This parameter change strategy allows the system to achieve superior moisture removal with reduced bleed air consumption, directly improving fuel efficiency.
Solution Approach 2:
The turbine serves multiple functions: it expands the high-pressure air for mixing, drives the compressor, and creates the pressure differential necessary for the two-stage moisture removal system. This multi-functionality allows the system to maintain effective moisture removal while reducing overall bleed air requirements, thereby improving fuel burn efficiency.
3Object-affected harmful factors
If a two-stage moisture removal system is implemented, then moisture removal is optimized, but device complexity increases
Solution Approach 1:
The system merges the two-stage moisture removal process with the existing air cycle machine components. The high-pressure water extractor is integrated into the compressor outlet, and the low-pressure condenser is integrated into the turbine outlet, where they work in conjunction with the air expansion and mixing processes. This merging approach minimizes additional complexity while achieving optimized moisture removal.
Solution Approach 2:
The system uses its own operational parameters to drive the moisture removal process. The compressor provides high-pressure air to the water extractor, and the turbine expansion provides low-pressure conditions for the condenser. The turbine itself drives the compressor, creating a self-sustaining cycle that reduces the need for external power sources and simplifies the overall system architecture despite the two-stage moisture removal capability.
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 bleed air usage by 40% to 60%, enhancing cabin pressurization and cooling while optimizing moisture removal, thereby improving engine efficiency and passenger comfort.
Implementation Method 1
a ram circuit with heat exchangers and a compressing device
Implementation Method 2
including a turbine and fan
Implementation Method 3
utilizing water extractors and condensers to optimize moisture removal
Implementation Method 4
a ram circuit with heat exchangers and a compressing device
Data Source
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AI summary
An airplane is provided. The airplane includes an environmental control system (100) coupled to an engine and an inlet (103). The engine provides a bleed. The inlet provides a fresh medium. The environmental control system (100) includes a compressing device (110) comprising a compressor (112) and a turbine (113). The environmental control system (100) also includes a moisture removal circuit that separately removes moisture from each of the first and second mediums (F1, F2) prior to combining the first medium (F1) and the second medium (F2) to form mixed air.