Integrated Pack Environmental Control System with Ram Air Heat Exchangers
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Solution Overview
Problem
Current aircraft environmental control systems face inefficiencies in fuel burn and operational redundancy, as they rely on bleed air and cabin outflow air for cooling and pressurization, which limits their ability to achieve high fuel burning efficiency and operational reliability.
Innovation Solution
The system integrates a ram air circuit with heat exchangers and compressing devices that mix bleed air, fresh air, and cabin discharge air to power the environmental control system, allowing for efficient cabin pressurization and cooling by utilizing energy from different air sources, including cabin outflow air to supplement bleed air, thereby reducing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bleed air is used for cabin pressurization and cooling, then the environmental control system can maintain cabin pressure and temperature, but fuel consumption increases
Solution Approach 1:
The system divides the air supply into multiple independent sources: bleed air from engines, cabin outflow air, and fresh air from ram air circuits. Each source can be independently controlled and mixed in different proportions, allowing optimization of fuel consumption while maintaining cabin environmental control
Solution Approach 2:
The system dynamically adjusts the composition and flow rates of different air sources based on operational conditions. By changing the parameters of air mixing ratios and flow rates, the system optimizes fuel efficiency across different flight phases while maintaining reliable cabin pressurization and cooling
2Device complexity
If a single-pack ECS configuration is used, then device complexity is reduced, but operational redundancy is lost
Solution Approach 1:
The patent combines multiple air supply sources and conditioning functions into a single integrated pack configuration. The integrated design merges bleed air processing, ram air circuit integration, and multiple compressing devices into one unified system, reducing overall device complexity while maintaining the operational redundancy of having multiple air sources
Solution Approach 2:
The integrated pack is designed to perform multiple functions using a single configuration: it can provide cabin pressurization, cooling, and heating by selectively mixing different air sources. The system's universal capability to handle various environmental control requirements from a single pack reduces complexity while maintaining reliability
3Loss of energy
If cabin outflow air is used to power compressing devices, then fuel efficiency improves, but system complexity increases
Solution Approach 1:
The system uses cabin outflow air, which would otherwise be wasted, to power the compressing devices. This self-service approach recovers energy from the cabin air cycle and uses it to drive compression, improving fuel efficiency without requiring external power sources
Solution Approach 2:
The compressing devices are arranged within the integrated pack structure, with turbines and compressors nested within the same housing. The ram air circuits are integrated into the pack boundaries, creating a compact nested arrangement that minimizes spatial complexity while enabling energy recovery
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 integrated approach enhances fuel efficiency and operational redundancy by effectively mixing and utilizing different air sources to provide conditioned air, reducing the number of system components and improving performance across various altitudes.
Implementation Method 1
two bleed/outflow heat exchangers
Implementation Method 2
a turbine having a first inlet and a second inlet configured to provide energy by expanding one or more of the plurality of mediums
Implementation Method 3
the compressor of each of the at least two compressing devices is configured to receive energy from at least one of the first medium and the second medium being expanded across the turbine, the compressor being configured to compress the third medium
Data Source
Figure 1
AI summary
An environmental control system (20) for providing conditioned air to a volume of an aircraft includes a ram air circuit (30) including a ram air shell (52) with at least one heat exchanger (34, 36) positioned therein. A dehumidification system (42) is arranged in fluid communication with the ram air circuit (70) and at least one compressing device (60) is arranged in fluid communication with the ram air circuit (30) and the dehumidification system (42). A plurality of mediums is receivable within the environmental control system (20). A first medium (Al) of the plurality of mediums is provided from the volume of the aircraft via at least one valve.