Carbon Fiber Heating Pipe for Cryogenic Hydrogen Cold Starts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aeronautical fuel cell propulsion systems face challenges in heating cryogenic liquefied hydrogen to room temperature for use in fuel cells, particularly at cold starts where external heating sources are not available, leading to inefficiencies and the need for larger, heavier heat exchangers.
Innovation Solution
A pipe system utilizing electrically conductive carbon fibers coated with a non-conductive material and embedded in a matrix, with a graphene layer for efficient heat transfer, is designed to heat cryogenic liquefied hydrogen internally using an integrated power supply, eliminating the need for external heating sources and reducing heat exchanger size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heating sources are used to heat cryogenic liquefied hydrogen to room temperature, then the hydrogen can be converted to gas form for use in fuel cells, but the system requires larger and heavier heat exchangers and external heating equipment
Solution Approach 1:
The heating function is merged with the pipe structure itself by embedding electrically conductive carbon fibers within the pipe wall matrix. This integration eliminates the need for separate external heating equipment and reduces the overall system weight while maintaining the temperature conversion function from cryogenic to room temperature
Solution Approach 2:
The pipe system performs self-heating by utilizing an internal power supply to generate heat through the conductive carbon fibers directly where needed. This self-service capability eliminates dependence on external heating sources and reduces the complexity and weight of the thermal management system
2Temperature
If external heating sources are used to heat cryogenic liquefied hydrogen, then the hydrogen can be converted to gas form, but the system becomes more complex and requires additional components
Solution Approach 1:
The heating functionality is combined with the pipe structure by embedding conductive carbon fibers within the pipe wall matrix. This merger reduces device complexity by eliminating separate heating components while maintaining the temperature conversion capability from cryogenic to room temperature
Solution Approach 2:
The pipe structure serves multiple functions: it contains the cryogenic hydrogen, provides structural support, and simultaneously acts as a heating element through the embedded carbon fibers. This multi-functionality reduces the number of separate components needed in the system
3Ease of manufacture
If conventional materials are used for the pipe, then the pipe can be manufactured, but hydrogen permeation and static electricity issues occur
Solution Approach 1:
The pipe is constructed as a composite material system with a matrix containing embedded electrically conductive carbon fibers. This composite structure provides both mechanical integrity for manufacturability and functional properties including hydrogen permeation resistance and static electricity management through the conductive fiber network
Solution Approach 2:
The carbon fibers are strategically distributed within the pipe wall matrix to provide localized functional properties. The conductive fibers specifically address hydrogen permeation and static electricity issues in critical regions while maintaining overall pipe manufacturability and structural 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 carbon fiber-reinforced polymer pipe effectively heats liquid hydrogen to gas form without external heating, reducing the size and weight of heat exchangers and ensuring efficient hydrogen conversion at cold starts, while the graphene layer enhances heat transfer and prevents hydrogen permeation and static electricity.
Implementation Method 1
the one or more carbon fibers are heated when power is supplied to the ply
Implementation Method 2
the graphene layer enhances heat transfer
Data Source
AI summary
A pipe for heating a cryogenic liquefied gas, the pipe having a peripheral wall including a ply of one or more electrically conductive carbon fibers, the ply being configured and electrically connectable to a power supply such that the one or more carbon fibers are heated when power is supplied to the ply.