Fuel Cell Thermal Management via Hydrogen Cooling
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Solution Overview
Problem
Fuel cell systems for aviation face challenges in weight reduction and reliability due to inefficient heat rejection and complex cooling systems, which limit their use as primary power sources for commercial airliners and increase system weight and payload constraints.
Innovation Solution
The method involves direct hydrogen cooling (HC) and anode exhaust gas recirculation for thermal management, combined with air cooling or phase change cooling, to simplify the cooling loop and enhance water management, reducing the need for additional humidification systems and minimizing parasitic power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a dedicated cooling loop with separate coolant system is used, then cooling efficiency is improved, but system weight and complexity increase
Solution Approach 1:
The patent merges the cooling function with the existing fuel supply system by using the hydrogen-containing gas as both fuel and coolant. The gas is supplied to the anode side where it performs electrochemical work and simultaneously cools the fuel cell stack, eliminating the need for a separate cooling loop and reducing system complexity.
Solution Approach 2:
The hydrogen-containing gas serves multiple functions: it acts as fuel for the electrochemical reaction, as coolant for thermal management, and as a medium for humidity control. This multi-functionality reduces the number of separate systems needed, thereby reducing overall system complexity and weight.
2Reliability
If a dedicated humidification system is added, then humidity control is improved, but system weight and complexity increase
Solution Approach 1:
The fuel cell stack self-regulates its humidity by controlling the water content in the supplied hydrogen-containing gas. The system uses the gas's inherent moisture and the water produced during electrochemical reactions to maintain optimal humidity levels, eliminating the need for external humidification equipment.
Solution Approach 2:
The hydrogen-containing gas simultaneously provides fuel, cooling, and humidification functions. By controlling the water content in this single gas stream, the system achieves humidity control without requiring separate humidification systems, thereby reducing complexity.
3Reliability
If system redundancy is increased for safety certification, then reliability is improved, but system weight increases
Solution Approach 1:
The patent combines multiple critical functions (cooling, humidification, fuel supply) into a single integrated system using the hydrogen-containing gas. This reduction in the number of components directly reduces system weight while maintaining reliability through the multifunctional design.
Solution Approach 2:
The invention extracts and eliminates unnecessary components from the traditional fuel cell system by recognizing that separate cooling and humidification systems are redundant when the hydrogen-containing gas can perform both functions simultaneously.
4Weight of moving object
If the cooling subsystem is reduced in weight, then system weight is improved, but cooling capability deteriorates
Solution Approach 1:
The hydrogen-containing gas self-cools the fuel cell stack during its normal flow through the anode side. The endothermic nature of the electrochemical reactions and the flow of the gas itself provide cooling, eliminating the need for heavy active cooling systems while maintaining effective temperature control.
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 significantly improves thermal management efficiency, reduces system complexity, and enhances reliability by eliminating the need for dedicated cooling loops and humidifiers, thereby increasing power density and reducing overall system mass, making fuel cells more suitable for aviation applications.
Implementation Method 1
cooling of the fuel cell is performed solely or predominantly s1) directly by the supplied predominantly hydrogen-containing gas
Implementation Method 2
recirculation of the predominantly hydrogen-containing gas in an anode-side recirculation circuit, which feeds the predominantly hydrogen-containing gas exiting at an anode gas outlet port of the fuel cell back to the anode gas inlet port
Implementation Method 3
Fuel cells are power generation devices that electrochemically convert the energy stored in fuels into electricity
Implementation Method 4
electrochemically convert the energy stored in fuels into electricity
Implementation Method 5
combined with air cooling or phase change cooling
Data Source
Figure 1
AI summary
The invention is related to a method for operating a fuel cell with the following features: a) supplying a predominantly hydrogen-containing gas to an anode gas inlet port of the fuel cell, b) supplying a predominantly oxygen-containing gas to a cathode gas inlet port of the fuel cell, c) cooling of the fuel cell, d) controlling the humidity of at least a part of the fuel cell. The invention is further related to a computer program for performing such method and to a fuel cell system having at least one fuel cell.