Sealed Electrochemical Compressor Vessel With Integral Hydrogen Leak Detection
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Solution Overview
Problem
Electrochemical compressors face significant challenges with hydrogen leakage due to its lightness and rapid diffusion, combined with potential degradation of seals and contamination from water used as a co-refrigerant, which hinders wide-scale consumer adoption and long-term reliability.
Innovation Solution
The implementation of a hermetically sealed vessel with chromium-plated sealing surfaces, using a 718 Aluminum alloy for brazing with a custom flux material free from contaminants like zinc, and the integration of an in-situ leak detection system utilizing sensors for continuous monitoring, along with composite polymer vessels that resist degradation and vibration, ensuring robust sealing and leak detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If hydrogen is used as working fluid in electrochemical compressors, then efficiency is improved, but leakage rate increases due to hydrogen's lightness and rapid diffusion
Solution Approach 1:
A sensor system acts as an intermediary between the hydrogen-containing system and the external environment, detecting hydrogen leakage through catalytic combustion or semiconductor oxide sensing mechanisms. This allows continuous monitoring and alerting without compromising the hydrogen system's efficiency while preventing harmful leakage.
Solution Approach 2:
The leak detection system provides continuous feedback about hydrogen levels to the control system, enabling real-time adjustments to prevent leakage. The feedback loop monitors hydrogen concentration and triggers alerts or shutdowns when thresholds are exceeded, maintaining system efficiency while preventing substance loss.
2Power
If multiple cells are connected in series to increase compression capability, then power is improved, but sealing surface area increases leading to higher leakage potential
Solution Approach 1:
Sensor systems are integrated as intermediaries within the multi-cell configuration, monitoring each cell or group of cells for hydrogen leakage. This allows the system to maintain high compression capability through multiple cells while the sensors detect and alert to any sealing failures before significant leakage occurs.
Solution Approach 2:
The multi-cell compressor is segmented into monitorable zones with individual or grouped sensors for each cell. This segmentation allows leakage detection at specific cell levels, enabling targeted maintenance while maintaining overall system power capability through the remaining functional cells.
3Temperature
If water is used as co-refrigerant, then cooling performance is improved, but seal degradation and metal ion dissolution occur
Solution Approach 1:
Sensors act as intermediaries to detect early signs of seal degradation or contamination in the water-co-refrigerant system. By monitoring for changes in the working fluid composition or seal integrity, the system can alert operators before reliability issues develop, allowing preventive maintenance.
Solution Approach 2:
The leak detection and sensor systems provide feedback about the condition of seals and working fluid quality. This feedback enables real-time monitoring of seal health and water purity, allowing the system to maintain cooling performance while preventing reliability degradation through early detection of problematic conditions.
4Reliability
If hermetic sealing is implemented to prevent leakage, then reliability is improved, but manufacturing complexity increases due to brazing requirements
Solution Approach 1:
Sensors are integrated as intermediaries during the manufacturing and sealing process, providing real-time feedback on seal integrity during brazing operations. This allows for quality control verification that ensures hermetic sealing reliability while streamlining the manufacturing process through automated detection and verification.
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 solution effectively prevents hydrogen leakage and ensures long-term reliable operation of electrochemical compressors by providing a robust, lightweight, and hermetically sealed system with continuous leak detection, enhancing consumer acceptance and operational efficiency.
Implementation Method 1
electrochemical compressor having an anode, a cathode, and a membrane disposed between the anode and the cathode
Implementation Method 2
a pump delivering the working fluid from the condenser to the evaporator
Data Source
AI summary
An electrochemical compressor system, such as an electrochemical refrigeration system includes a sealed vessel that reduces leak issues related to the electrochemical cell. The sealed vessel may be molded or formed from a polymer or a composite polymer having reinforcing materials, such as fibers therein. The sealed vessel may be plated with metal to reduce gas permeation through the wall of the vessel and to accommodate and improve the attachment of conduits, including metal conduits thereto. A metal conduit may be brazed onto a vessel and the brazing material may be selected for polymer to metal joining and for reduced contamination potential of the system. The electrochemical compressor system incorporates a leak sensor configured at least partially within the sealed rigid vessel that measures the pressure within the vessel.