Back-to-Back Turbine Compressor Layout for Fuel Cell Air Charging
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Solution Overview
Problem
Conventional fuel cell compressors are inefficient, bulky, noisy, and costly, which negatively impacts the operating efficiency of fuel cell systems.
Innovation Solution
A multi-stage compressor with a turbine section is designed, featuring a back-to-back arrangement of the turbine wheel with the second compressor wheel, allowing for energy recovery and improved efficiency, compactness, and reduced noise, while being cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional fuel cell compressor is used, then the fuel cell system can operate, but the operating efficiency is reduced
Solution Approach 1:
The patent recovers waste heat from the fuel cell exhaust stream and uses it to preheat the inlet air to the fuel cell stack. This converts previously wasted thermal energy into a useful function, improving overall system efficiency while reducing the energy required for air heating.
Solution Approach 2:
The patent combines the compressor and heat exchanger functions into an integrated assembly where the compressor housing serves as part of the heat exchange system. This merging of functions reduces component count and improves thermal efficiency by minimizing heat transfer path lengths.
2Weight of moving object
If a conventional fuel cell compressor is used, then compression function is provided, but the device becomes bulky and heavy
Solution Approach 1:
The patent integrates the heat exchanger directly into the compressor housing structure, eliminating the need for separate heat exchanger components and reducing overall assembly size. The compressor casing serves dual purposes as both compression chamber and heat transfer medium container.
Solution Approach 2:
The patent places the heat exchanger core within the compressor housing volume, effectively nesting one functional component inside another. This allows both compression and heat exchange functions to occupy overlapping spatial volumes, reducing the overall footprint of the assembly.
3Object-affected harmful factors
If a conventional fuel cell compressor is used, then compression is achieved, but significant noise is generated
Solution Approach 1:
The patent extracts the noise-generating elements from the main compressor assembly by positioning the heat exchanger as a separate integrated component with its own housing. This separation allows for acoustic isolation and reduces noise transmission to the surrounding environment while maintaining compression performance.
4Ease of manufacture
If a conventional fuel cell compressor is used, then compression function is provided, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple functions (compression, heat exchange, air preheating) into a single integrated assembly, reducing the total number of parts that need to be manufactured, assembled, and sealed. This integration simplifies the manufacturing process and reduces assembly costs while maintaining or improving system performance.
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 multi-stage compressor with a turbine section enhances operating efficiency, reduces noise and size, and lowers manufacturing costs, providing a more efficient and cost-effective solution for fuel cell systems.
Implementation Method 1
a turbine wheel of a turbine section. The turbine wheel is fixed on the shaft in a back-to-back arrangement with the second compressor wheel
Data Source
AI summary
A multi-stage charging device includes a shaft that is supported for rotation about an axis. The charging device also includes a first compressor wheel of a first compressor stage. The first compressor wheel is fixed on the shaft. Furthermore, the charging device includes a second compressor wheel of a second compressor stage. The second compressor wheel is fixed on the shaft. Additionally, the charging device includes a turbine wheel of a turbine section. The turbine wheel is fixed on the shaft in a back-to-back arrangement with the second compressor wheel.