Membrane Humidifier Segmentation for Fuel Cell Moisture Transfer
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Solution Overview
Problem
Existing membrane humidifiers in fuel cell systems face challenges in maintaining operational reliability with low maintenance and high efficiency, particularly due to the high operating temperature and air mass flow rates which cause the proton exchange membrane to dry out, reducing fuel cell efficiency.
Innovation Solution
A membrane humidifier design comprising multiple stacking units with a moisture-permeable membrane and diffusion layers, where the flow plate and diffusion units are structured to facilitate efficient moisture transfer between gas streams, using receiving elements that allow for simple and secure assembly without gluing, and a housing with manifolds for gas stream management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high operating temperature (80-95°C) is used to enable better heat removal and maximum fuel cell output, then heat removal efficiency is improved, but the proton exchange membrane dries out more strongly reducing fuel cell efficiency
Solution Approach 1:
The humidifier is divided into multiple stacking units (at least two) arranged in series, with each unit containing a moisture-permeable membrane and diffusion layers. This segmentation allows for distributed moisture transfer across multiple stages, effectively humidifying the cathode feed air at high operating temperatures without causing membrane drying.
Solution Approach 2:
A moisture-permeable membrane is introduced as an intermediary between the cathode exhaust air (moist) and cathode feed air (dry). The membrane selectively transfers moisture from the exhaust stream to the feed stream, enabling efficient humidification while maintaining the high temperature operation needed for heat removal.
2Productivity
If multiple stacking units with moisture-permeable membrane and diffusion layers are used to enable efficient moisture transfer, then humidification efficiency is improved, but device complexity increases
Solution Approach 1:
The humidifier is divided into multiple stacking units (at least two) arranged in series, with each unit containing a moisture-permeable membrane and diffusion layers. This segmentation allows for distributed moisture transfer across multiple stages, effectively humidifying the cathode feed air at high operating temperatures without causing membrane drying.
Solution Approach 2:
Multiple functional components (moisture-permeable membrane, first diffusion layer, second diffusion layer, flow channels) are merged into integrated stacking units. Each stacking unit combines these elements in a compact configuration, reducing overall system complexity while maintaining high humidification efficiency through the series arrangement of multiple units.
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 design enables reliable and efficient humidification of cathode feed air in fuel cell systems, maintaining high fuel cell efficiency by minimizing maintenance and ensuring effective moisture transfer, suitable for both fuel cell systems and other applications like house ventilation.
Implementation Method 1
the moisture of the cathode exhaust air is transmitted through a moisture-permeable membrane to the dry cathode feed air
Implementation Method 2
moisture of the cathode exhaust air is transmitted through a moisture-permeable membrane
Data Source
AI summary
A membrane humidifier has multiple stacking units mounted one on top of the other, where an individual stacking unit includes a flow plate and diffusion unit, where a circumference of the diffusion unit is formed by two oppositely situated first edge sides and two oppositely situated second edge sides. The diffusion unit includes: a top layer on a top side of the diffusion unit, a bottom layer on a bottom side of the diffusion unit, a moisture-permeable membrane, two oppositely situated upper receiving elements at the two first edge sides, on the top side of the diffusion unit, and two oppositely situated lower receiving elements at the two second edge sides, on the bottom side of the diffusion unit, where the flow plate of the stacking unit is inserted into the two lower receiving elements, and where the next stacking unit is inserted into the two upper receiving elements.