Advanced environmental control system in an integrated simple cycle pack
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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, which limits their ability to achieve high efficiency in cabin pressurization and cooling.
Innovation Solution
An integrated environmental control system that utilizes a ram air circuit with a heat exchanger and dehumidification system, coupled with a plurality of expansion devices, including turbines and fans, to efficiently power the system using bleed air and fresh air, reducing component count and enabling mounting within a single aircraft bay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If bleed air and cabin outflow air are used to power the environmental control system, then the system can maintain cabin pressurization and cooling, but fuel burning efficiency is limited
Solution Approach 1:
The environmental control system is divided into multiple independent expansion devices (first expansion device and second expansion device) that can operate independently. Each device has its own air source options (bleed air or fresh air), allowing the system to segment the airflow paths and select the most efficient source for each device, thereby improving overall fuel efficiency while maintaining operational redundancy.
Solution Approach 2:
The system is designed to accept multiple air sources (bleed air from engines or APU, and fresh air from the environment) that can be used by either expansion device. This multi-functionality allows the system to adapt to different operating conditions and select the optimal air source to maximize fuel efficiency without compromising reliability.
2Weight of stationary object
If a single integrated refrigeration package is used, then component count is reduced and weight is decreased, but operational redundancy is limited compared to two-pack systems
Solution Approach 1:
The single integrated pack contains segmented functional components - specifically two separate expansion devices with independent control valves and air source selections. This segmentation within a unified package provides operational redundancy (if one expansion device fails, the other can continue operation) while maintaining the weight and space benefits of a single integrated structure.
Solution Approach 2:
Multiple functional elements (two expansion devices, heat exchangers, dehumidification systems, and control valves) are merged into a single integrated pack structure. This combining reduces the overall system weight and simplifies installation within a single aircraft bay, while the internal segmentation of critical components preserves operational redundancy.
3Productivity
If multiple expansion devices are arranged in parallel, then system efficiency is improved, but device complexity increases
Solution Approach 1:
Both expansion devices are designed with identical multi-functional capabilities - each can receive bleed air or fresh air, and each has its own control valve and air source selection logic. This universality simplifies the control strategy and makes the system easier to operate and maintain, despite the parallel configuration, because the same control principles apply to both devices.
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 burning efficiency and operational redundancy by using different air sources to power the environmental control system, reducing weight and cost while maintaining effective cabin pressurization and cooling.
Implementation Method 1
a ram air circuit including a ram air shell having a heat exchanger positioned therein
Implementation Method 2
each of the plurality of expansion devices further comprises a turbine configured to provide energy by expanding a first medium therein
Implementation Method 3
each of the plurality of expansion devices further comprises a fan configured to receive energy from a second medium
Implementation Method 4
a dehumidification system arranged in fluid communication with the ram air circuit
Data Source
AI summary
An environmental control system of an aircraft includes a ram air circuit including a ram air shell having a heat exchanger positioned therein and a dehumidification system arranged in fluid communication with the ram air circuit. A plurality of expansion devices is arranged in fluid communication with the ram air circuit and the dehumidification system. At least one of the expansion devices is a simple cycle expansion device.