Integrated Aircraft Environmental Control Pack with Ram Air Heat Exchanger
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Solution Overview
Problem
Current aircraft environmental control systems face limitations in efficiency, particularly in terms of engine fuel burn, as they rely on bleed air and cabin outflow air for cooling and pressurization, offering only partial improvements.
Innovation Solution
An integrated environmental control system that mixes bleed air, fresh air, and cabin discharge air to power the system, using a ram air circuit and heat exchangers to achieve high fuel burning efficiency, with compressing devices and valves configured to optimize airflow and energy extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If bleed air and cabin outflow air are used to power a single integrated refrigeration package, then fuel efficiency is improved, but system complexity increases
Solution Approach 1:
The patent combines multiple air sources (bleed air from engines and cabin outflow air) into a single integrated refrigeration package, merging previously separate systems into one unified unit that shares common components like heat exchangers and compressors, thereby improving fuel efficiency while managing complexity through integration
Solution Approach 2:
The single integrated refrigeration package performs multiple functions: it conditions cabin air, powers compression systems, and utilizes both bleed air and cabin outflow air as power sources. This multi-functionality allows the system to achieve fuel efficiency improvements while consolidating operations into one versatile package
2Loss of energy
If multiple air sources are utilized to power the system, then fuel consumption is reduced, but component arrangement complexity increases
Solution Approach 1:
The patent merges multiple air intake paths and processing streams into a unified component arrangement where bleed air and cabin outflow air converge to power shared compressors and heat exchangers, reducing fuel consumption through efficient energy utilization while managing spatial complexity through consolidated design
Solution Approach 2:
The system segments airflow paths into distinct circuits (bleed air circuit and cabin outflow air circuit) that are clearly defined and controlled by separate valves, allowing independent management of each air source while integrating their combined output to power the refrigeration package efficiently
3Reliability
If a single integrated pack is used, then redundancy is achieved, but the number of components is reduced
Solution Approach 1:
The single integrated pack is designed with multi-functional components that can operate in different modes to provide redundancy. The compressors can be selectively powered by either bleed air or cabin outflow air, and the heat exchangers serve multiple purposes in different operational scenarios, ensuring operational redundancy while maintaining a reduced component count
Solution Approach 2:
The system incorporates dynamic control through valves that can redirect airflow between different paths and compressors based on operational requirements. This dynamic adaptability allows the single integrated pack to provide redundancy by flexibly reconfiguring its internal airflow paths without requiring duplicate standalone systems
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 efficient cabin pressurization and cooling while reducing fuel consumption by effectively utilizing multiple air sources, resulting in a more efficient and redundant air conditioning package with reduced component count and weight.
Implementation Method 1
The outflow heat exchanger is upstream from the primary heat exchanger such that the outflow heat exchanger cools the first medium before the first medium enters the primary heat exchanger
Implementation Method 2
The turbine is configured to extract work from the first medium to power the compressing mechanism
Implementation Method 3
The compressing mechanism is configured to compress the second medium
Data Source
Figure 1
AI summary
An environmental control system of an aircraft includes a ram air circuit (30) having a ram air shell (32) with at least one heat exchanger (34, 36) positioned therein. A dehumidification system (42) is arranged in fluid communication with the ram air circuit and a plurality of compressing devices (60) is arranged in fluid communication with the ram air circuit and the dehumidification system.