Fuel Cell Cathode Gas Cooling via Water Evaporation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel cell systems have poor heat exchange efficiency, leading to insufficient cooling of cathode gas, which increases the load on the fuel cell and reduces its cooling performance.
Innovation Solution
A fuel cell system with a cathode gas cooling system that uses a heat exchanger with independent first and second internal channels, where the latent heat of vaporization of water is utilized to cool the cathode gas, preventing steam from entering the gas channels and ensuring efficient heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat exchange is performed between cathode off-gas and compressed cathode gas, then cooling of cathode gas is achieved, but heat exchange efficiency is poor and cooling performance is insufficient
Solution Approach 1:
The patent utilizes the phase transition of water from liquid to vapor (evaporation) to achieve efficient heat exchange. Water is evaporated in the second internal channels, and the latent heat of vaporization absorbs heat from the cathode gas flowing through the first internal channels, thereby cooling the cathode gas efficiently.
Solution Approach 2:
The heat exchanger is divided into two independent internal channels: first internal channels for cathode gas flow and second internal channels for water flow. This segmentation allows independent optimization of each flow path and prevents steam from mixing with cathode gas, maintaining high heat exchange efficiency.
2Temperature
If conventional heat exchange between gases is used, then cooling is achieved, but the load on the fuel cell increases and cooling performance drops
Solution Approach 1:
By utilizing the phase transition of water (evaporation), the system achieves superior cooling efficiency compared to conventional gas-to-gas heat exchange. The latent heat of vaporization provides a large heat absorption capacity, effectively cooling the cathode gas and reducing the load on the fuel cell while maintaining reliable cooling performance.
3Temperature
If steam flows into cathode gas channels, then heat exchange occurs, but heat exchange efficiency decreases and cooling performance is compromised
Solution Approach 1:
The heat exchanger is segmented into two independent internal channels: first internal channels for cathode gas and second internal channels for water. This physical separation prevents steam generated in the second channels from flowing into the first channels, maintaining high heat exchange efficiency and effective cooling performance.
Solution Approach 2:
The heat exchanger structure acts as an intermediary barrier between the water/steam side and the cathode gas side. It allows heat transfer through the channel walls while preventing direct mixing of steam and cathode gas, thereby maintaining efficient heat exchange and cooling 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
This configuration efficiently cools the cathode gas while maintaining the overall cooling performance of the fuel cell system, preventing a drop in cooling efficiency and reducing the load on the fuel cell.
Implementation Method 1
using the latent heat of vaporization of water flowing through the second internal channels to cool the cathode gas flowing through the first internal channels
Implementation Method 2
a heat exchanger having first internal channels into which cathode gas flows and second internal channels in which water discharged from the fuel cell is supplied
Implementation Method 3
configured so that steam produced inside the second internal channels due to heat exchange with the cathode gas flowing through the first internal channels does not flow into the first internal channels
Data Source
AI summary
A cathode gas cooling system provided with a heat exchanger having first internal channels into which cathode gas flows and second internal channels to which water discharged from a fuel cell is supplied and cooling cathode gas flowing through the first internal channels by latent heat of vaporization of water flowing through the second internal channels. The first internal channels and second internal channel are are respectively made independent channels inside the heat exchanger so that steam produced inside the second internal channels by heat exchange with cathode gas flowing through the first internal channels does not flow into the first internal channels.