Electrochemical Compressor Hydrogen Localization
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Solution Overview
Problem
Conventional vapor compression refrigeration cycles are limited by the presence of hydrogen in the system, which reduces overall efficiency and increases complexity, as hydrogen needs to be separated from the working fluid stream.
Innovation Solution
An electrochemical compressor system utilizing an electrolyzer and a fuel cell, where hydrogen is introduced near the membrane electrode assembly of the fuel cell, allowing protons to react with oxygen to reform water at a higher pressure, thereby reducing the impact of hydrogen on the compression system and simplifying the separation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydrogen is present in the working fluid stream, then the electrochemical compressor can function, but the overall system efficiency decreases and system complexity increases due to the need for separation
Solution Approach 1:
The patent extracts hydrogen from the main working fluid stream and confines it to the compressor section where it is needed. The hydrogen is generated by an electrolyzer, introduced to the anode side of the fuel cell, and consumed in the electrochemical reaction, preventing it from contaminating the condenser and evaporator systems.
Solution Approach 2:
The system is divided into distinct functional zones: hydrogen generation (electrolyzer), hydrogen consumption (fuel cell anode), and working fluid processing (condenser/evaporator). This segmentation allows hydrogen to be localized where it provides benefit without interfering with other system components.
2Ease of operation
If hydrogen is present in the working fluid stream, then the electrochemical compressor can function, but device complexity increases due to separation requirements
Solution Approach 1:
Hydrogen is extracted from the potential working fluid stream and confined to the compressor section. The electrolyzer generates hydrogen locally, and the fuel cell consumes it immediately, eliminating the need for complex separation systems downstream.
Solution Approach 2:
The hydrogen is self-contained within the compressor unit, generated by the electrolyzer and consumed by the fuel cell. This self-service approach eliminates the need for external separation infrastructure and simplifies the overall system architecture.
3Device complexity
If conventional vapor compression is used, then system simplicity is maintained, but energy consumption increases due to mechanical compressor requirements
Solution Approach 1:
The patent replaces the conventional mechanical compressor with an electrochemical compressor that uses electrochemical reactions (fuel cell) to compress the working fluid. This substitution eliminates mechanical moving parts in the compression process and reduces energy consumption.
Solution Approach 2:
The compression mechanism changes from mechanical work to electrochemical potential energy conversion. The fuel cell uses the electrochemical reaction between hydrogen and oxygen to drive the compression process, fundamentally changing the energy conversion parameters.
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 enhances the efficiency of the system by localizing hydrogen use near the compressor, reducing system complexity and improving energy performance by using hydrogen generated by an electrolyzer and consumed within the compressor unit.
Implementation Method 1
The electrolyzer electrolyzes a electrochemical working fluid, at a first pressure, into decomposition products
Implementation Method 2
The fuel cell transfers a first decomposition product across an ion exchange membrane where it recombines
Implementation Method 3
where it recombines with a second decomposition product to reform the electrochemically active working fluid
Data Source
AI summary
An electrochemical compression system utilizes an electrolyzer to electrolyze an electrochemically active working fluid, at a first pressure, into decomposition products that are reformed back into said electrochemically active working fluid by a fuel cell, at a higher pressure. Water may be electrolyzed into hydrogen and oxygen and stored in reservoir tanks at an elevated pressure and subsequently provided to a fuel cell for reforming. The hydrogen is provided to the anode side of a polymer electrolyte membrane fuel cell and the oxygen is provided to the cathode side. Water is reformed on the cathode side of the fuel cell at a higher pressure than the inlet to the electrolyzer. This pressure differential enable flow of the electrochemically active working fluid through a conduit from the cathode to the electrolyzer. This flow of fluid may be used in a heat transfer system.