Hybrid Emergency Power Unit Efficiency Improvement
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Solution Overview
Problem
Existing emergency power units in aircraft face challenges such as damage during deployment, weight and complexity issues, instability, and operational limitations due to altitude and temperature conditions, necessitating a reliable integrated hybrid system.
Innovation Solution
An integrated energy conversion system comprising a fuel cell-based emergency power unit, an auxiliary power unit with an engine and generator, and an efficiency improvement apparatus featuring a heat exchanger and bypass valve for fluidic communication between the units to enhance efficiency and operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuel cell-based emergency power unit is used, then reliability is improved, but device complexity increases due to the need for heat exchanger and bypass valve systems
Solution Approach 1:
The system divides the power generation function into two separate units: a fuel cell-based emergency power unit and an auxiliary power unit with engine and generator. This segmentation allows each unit to be optimized for its specific function, improving overall reliability while managing complexity through functional separation.
Solution Approach 2:
The heat exchanger and bypass valve system serves multiple functions: it manages thermal conditions for the fuel cell, preheats intake air, and works with both the emergency power unit and auxiliary power unit. This multi-functionality reduces the need for separate systems, thereby managing complexity while maintaining reliability.
2Use of energy by moving object
If heat exchanger and bypass valve are added to improve efficiency, then energy conversion efficiency is improved, but weight increases
Solution Approach 1:
The system changes the temperature parameter of the intake air by using the heat exchanger to preheat it using waste heat from the auxiliary power unit. This parameter change improves the efficiency of both power units by optimizing their operating conditions without requiring additional energy input.
Solution Approach 2:
The system converts the waste heat from the auxiliary power unit, which would otherwise be discarded, into a useful resource for preheating the intake air for both the fuel cell and the auxiliary power unit itself. This converts a harmful waste product into a beneficial input, improving efficiency while avoiding the need for additional heating systems that would increase weight.
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 provides reliable onboard emergency electrical power by improving the efficiency and operational conditions of both the emergency and auxiliary power units, addressing the limitations of existing systems and ensuring consistent performance across varying altitudes and temperatures.
Implementation Method 1
The heat exchanger may be in fluidic communication with the emergency power unit and the auxiliary power unit
Implementation Method 2
The emergency power unit may have a fuel cell
Implementation Method 3
The auxiliary power unit may have an engine and a generator wherein the engine drives the generator to produce electrical power
Data Source
AI summary
An integrated hybrid emergency power system having various features is disclosed. A hybrid emergency power system may have an auxiliary power unit and an emergency power unit. The emergency power unit may have a fuel cell. The auxiliary power unit may have an engine. The emergency power unit may be connected to the auxiliary power unit by an emergency power unit efficiency improvement apparatus. In this manner, the operating efficiency of the emergency power unit may be enhanced.