Fuel Cell Humidifier Membrane Layout for Uniform Airflow
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Solution Overview
Problem
Conventional humidifiers for fuel cells face inefficiencies in humidification due to the uneven flow of dry and humid air through hollow fiber membranes, leading to reduced performance and increased manufacturing costs, particularly in high power regions where flooding and catalyst deterioration occur.
Innovation Solution
A humidifier design where hollow fiber membranes of different diameters are arranged such that smaller diameter membranes are at the center and larger diameter membranes are at the periphery, ensuring uniform air distribution and preventing flooding, while also using cost-effective materials like polyetherimide or polyphenylsulfone for the intermediate diameter membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If hollow fiber membranes are concentrated in the hollow fiber membrane module, then the structure is compact, but the humid air cannot permeate through the module effectively and humidification efficiency decreases
Solution Approach 1:
The patent applies local quality by differentiating the hollow fiber membrane arrangement into two distinct zones: a first region with membranes concentrated to enable compact design, and a second region with membranes distributed to ensure effective humid air permeation and maintain humidification efficiency. This spatial differentiation resolves the contradiction between compactness and productivity.
2Length of moving object
If dry air flows through the center of the hollow fiber membrane module, then the flow path is short, but the humidification efficiency is reduced
Solution Approach 1:
The patent implements local quality by creating different flow path characteristics in different regions: in the first region where membranes are concentrated, the flow path is optimized for compactness, while in the second region where membranes are distributed, the flow path is extended to enhance humidification efficiency. This ensures that dry air receives sufficient humidification while maintaining overall system compactness.
3Reliability
If expensive materials like Nafion are used for hollow fiber membranes, then humidification performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies local quality by using expensive high-performance materials like Nafion only in the first region where membranes are concentrated and humidification performance is most critical, while using cost-effective materials in the second region where membranes are distributed. This selective material placement maintains necessary performance while significantly reducing overall manufacturing cost.
Solution Approach 2:
The patent employs composite materials strategy by combining different membrane materials with different cost-performance characteristics in different regions of the same module. This creates a hybrid system that leverages the superior performance of expensive materials where needed while using economical materials elsewhere, achieving cost-effective manufacture without sacrificing overall reliability.
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 arrangement enhances humidification efficiency, prevents flooding, and reduces manufacturing costs by optimizing air flow and using less expensive materials, thereby improving the durability and performance of the fuel cell humidifier.
Implementation Method 1
the water in the exhaust gas is separated by capillary action of the hollow fiber membranes 106
Data Source
AI summary
The present invention provides a humidifier for a fuel cell, in which a plurality of hollow fiber membranes having different diameters are appropriately arranged to control the flow direction of dry air introduced into the humidifier, thus uniformly humidifying the dry air.