Involute Fuel Cell Stack Layout for Uniform Air Cooling
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Solution Overview
Problem
Existing air-cooled hydrogen fuel cell (HTPEM) systems face challenges in scaling and packaging due to uneven cooling, excessive weight, and power inefficiencies, particularly in aircraft applications, where longitudinal stack placement leads to uneven cooling distribution, increased drag, and quadratic weight increases in reactant pipes and electrical wires.
Innovation Solution
The arrangement of fuel cells in involute-shaped stacks, aligned in a curved or spiraled pattern around a circle, with evenly spaced gaps and separate cooling flows, ensures uniform cooling across stacks, reducing system volume and weight, and optimizing airflow distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If longitudinal stack placement is used, then the system can be scaled to meet power requirements, but cooling uniformity deteriorates and drag increases
Solution Approach 1:
The patent applies curved/arc-shaped stack placement instead of longitudinal linear arrangement. The stacks are positioned along a curved path within the nacelle, which optimizes the airflow distribution and cooling uniformity across all stacks while maintaining the required power output capacity.
2Power
If longitudinal stack placement is used, then power requirements can be met, but system drag increases
Solution Approach 1:
The curved stack arrangement reduces aerodynamic drag by creating a more streamlined configuration within the nacelle. The arc-shaped placement allows for better airflow management around the stacks, reducing turbulence and pressure drag compared to linear longitudinal placement.
3Power
If multiple stacks are used to increase power, then power output improves, but system weight increases quadratically
Solution Approach 1:
The patent combines multiple fuel cell stacks into a single integrated curved arrangement within the nacelle. By merging the stacks along a curved path rather than placing them separately in longitudinal positions, the system achieves the required power output while minimizing the quadratic weight increase through shared structural and cooling infrastructure.
4Weight of moving object
If air cooling is used to reduce weight, then system weight decreases, but cooling capacity becomes insufficient for scaled systems
Solution Approach 1:
The curved stack arrangement optimizes air cooling capacity by creating a flow pattern that distributes coolant more evenly across all stacks. The arc-shaped configuration allows ambient air to flow through the nacelle and cool all stacks uniformly, increasing the effective cooling capacity without adding heavy liquid coolant systems.
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 design achieves more uniform coolant supply, resulting in a compact, lightweight, and energy-efficient stack construction that fits within aircraft dimensions, improving mobility and efficiency by minimizing drag and weight.
Implementation Method 1
A fuel cell (FC) is an electrochemical cell that converts chemical energy of fuel into electrical energy by means of spontaneous electrochemical reduction-oxidation (redox) reactions
Implementation Method 2
Cooling systems for FC-powered vehicles oftentimes use an airflow generated during movement of the vehicle as a heat transfer medium
Data Source
AI summary
Disclosed is an air-cooled fuel cell (FC) stack including a plurality of FCs arranged in a stack in a curved pattern. The plurality of FC stacks are arranged spaced from one another in a curved pattern, preferably a spiral pattern, more preferably an involute pattern. Also disclosed is an integrated FC electric engine for a vehicle such as an aircraft including a centrifugal compressor and a turbine rotatably mounted on a shaft, and one or more curved FC stacks arranged to an outside of the rotatably mounted centrifugal compressor and the rotatably mounted turbine.