Hydrogen ECS Cooling via Turbo Expansion in Aircraft
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Solution Overview
Problem
Aircraft Environmental Control Systems (ECS) face high fuel burn consumption due to factors like bleed and ram air usage, and the weight of the system, which can be mitigated by using pressurized fuels like hydrogen or ammonia, but the heavy tanks required for compressed fuels pose implementation challenges.
Innovation Solution
The system employs a pressurized hydrogen or ammonia fuel system that uses a turbo-compressor and fuel cell configuration to generate power, where highly pressurized hydrogen is expanded to drive a turbo expander, reducing pressure and temperature to cool ram air for cabin conditioning, potentially eliminating the need for an ECS pack and reducing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pressurized hydrogen or ammonia fuel system is used to cool air for cabin conditioning, then fuel burn consumption is reduced and ECS weight is decreased, but heavy tanks are required for compressed fuel storage
Solution Approach 1:
The patent combines the fuel storage system with the ECS cooling function by using the pressurized fuel tanks to drive turbo-expanders that produce cold air for cabin conditioning. This merging of functions allows the fuel system to serve dual purposes: power generation and environmental control, thereby reducing overall fuel consumption while utilizing the necessary tank infrastructure for fuel storage.
Solution Approach 2:
The pressurized fuel tanks and associated components are designed to perform multiple functions: storing fuel, driving turbo-expanders for power generation, and providing cooling for the ECS. This multi-functionality reduces the need for separate dedicated ECS components, offsetting the weight penalty of the fuel tanks through functional consolidation.
2Use of energy by moving object
If traditional ECS pack is eliminated to reduce weight and fuel consumption, then fuel burn consumption and system weight are reduced, but power generation capability may be insufficient
Solution Approach 1:
The patent merges the ECS cooling function with the power generation system by using turbo-expanders driven by pressurized fuel. The turbo-expanders simultaneously produce cold air for cabin conditioning and generate electrical power, eliminating the need for separate ECS packs while maintaining adequate power generation capability.
Solution Approach 2:
The turbo-expander system is designed to perform dual functions: generating electrical power for aircraft systems and providing cooling for the ECS. This multi-functionality ensures that eliminating traditional ECS packs does not compromise power generation capability, as the same components serve both purposes.
3Power
If turbo-compressor and turbo expander configuration is used to expand pressurized fuel, then power is generated and ram air is cooled for cabin conditioning, but system complexity increases
Solution Approach 1:
The patent combines the compressor and expander into an integrated turbo-machinery system where the fuel drives the expander to generate power, and the same mechanical system provides cooling for the ECS. This merging reduces the number of independent systems required, thereby managing complexity while achieving both power generation and environmental control functions.
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 configuration reduces the weight and improves performance of the ECS system by using the fuel to cool air for cabin conditioning, minimizing fuel burn consumption and eliminating the need for a traditional ECS pack, while also generating power for flight and onboard systems.
Implementation Method 1
highly pressurized hydrogen is expanded to drive a turbo expander, reducing pressure and temperature to cool ram air for cabin conditioning
Implementation Method 2
a pressurized fuel may be directed from a pressurized fuel tank to a fuel consumption system
Data Source
Figure 1
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AI summary
Aircraft systems including a pressurized fuel tank (402) containing a pressurized fuel, a turbo expander (414) configured to receive the pressurized fuel from the fuel tank, the turbo expander configured to decrease a pressure of the pressurized fuel to generate low pressure fuel having pressure less than the pressurized fuel, a fuelto-air heat exchanger (410) configured to receive the low pressure fuel from the turbo expander as a first working fluid and air as a second working fluid, the heat exchanger configured to cool the air and warm the fuel, an aircraft cabin configured to receive the cooled air, and a fuel consumption system (410) configured to consume the fuel to generate power.