Aircraft Cabin Air Compression Control for Variable Power

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Solution Overview

Problem

Aircraft air-conditioning systems with multiple compressors face increased power demands and inefficiencies due to varying ambient air pressure and altitude, as they rely on external conditions to determine operating modes.

Innovation Solution

An air-conditioning system for aircraft that includes two compressed air sources, where a controller manages power usage by switching between these sources based on available power levels, using one source at low power and both sources at higher power to optimize performance and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple compressors are used to cover the large demanded operation range, then the adaptability to varying ambient air pressure and altitude is improved, but the power demand on the aircraft increases

Engineering Contradiction:

Improveadaptability to varying ambient air pressureVSAvoidpower demand

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The system dynamically switches between different operating modes (single compressor vs. multiple compressors) based on real-time ambient air pressure conditions. The controller adjusts the number of active compressors according to the operating conditions, making the system adaptable without continuously operating all compressors, thus reducing overall power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes its operational parameters (number of active compressors) in response to changing ambient air pressure parameters. By monitoring ambient pressure and adjusting compressor configuration accordingly, the system maintains adaptability across different altitudes while optimizing power usage by not running excessive compressors under favorable conditions.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If multiple compressors are operated to maintain performance across different flight altitudes, then the reliability of air-conditioning supply is improved, but the device complexity increases

Engineering Contradiction:

Improvereliability of air-conditioning supplyVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The air-conditioning system is segmented into multiple independent compressor units that can operate individually or in combination. This segmentation allows the system to maintain reliability through redundancy while managing complexity by enabling selective activation of compressor units based on operating conditions, rather than requiring all units to be simultaneously operational.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple compressor units are designed with universal functionality, where each compressor can independently provide the required air-conditioning supply. This multi-functionality ensures reliability through redundancy while managing system complexity by allowing any single compressor to potentially satisfy the entire demand, reducing the need for complex coordination mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If compressors are operated at full capacity to meet peak demand, then the productivity of air supply is improved, but the energy consumption increases significantly

Engineering Contradiction:

Improveair supply capacityVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The system applies partial action by operating only the necessary number of compressors based on actual demand and ambient conditions. Instead of always running all compressors at full capacity, the system activates the minimum required compressors to meet the air supply demand, thereby maintaining productivity while significantly reducing energy consumption during periods when full capacity is not needed.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system employs periodic assessment of operating conditions (ambient air pressure, temperature, altitude) and adjusts compressor operation accordingly. By periodically evaluating the need for full compressor capacity and switching between single and multiple compressor modes, the system maintains required productivity while avoiding continuous high energy consumption.

Inventive Principle:

Principle #19Periodic action

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 approach reduces power consumption by up to 20% by utilizing energy from depressurized air and allows for efficient operation across a wide range of conditions without relying solely on external ambient air pressure.

Implementation Method 1

a turbine in communication with the compressor and with a motor; the compressor, motor and turbine being in communication with one another via a shaft

Methodology Applied

Scientific EffectGas expansion: Pressure Increase

Data Source

PatentUS9205925B2Turbo air compressor

Publication Date: 2015.12.08 HAMILTON SUNDSTRAND CORP

AI summary

A method for operating an air-conditioning system for an aircraft including receiving an available power level from a control system of the aircraft, forwarding air from a first compressed air source to an aircraft cabin and forwarding air from a second compressed air source to the aircraft cabin if the available power level exceeds a threshold value.