Fuel Cell Recirculation Fan Cooling via Water Separator Heat Coupling
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Solution Overview
Problem
Existing fuel cell systems face challenges in efficiently cooling the recirculation fan drive device, which is typically operated by an electric motor, and managing water accumulation in the anode due to product water from the cathode side, leading to potential system inefficiencies and reduced service life.
Innovation Solution
A recirculation assembly is introduced that includes a water separator to separate liquid water from the anode exhaust gas flow, with the drive device of the recirculation fan being thermally coupled to the water separator via a heat sink, utilizing the anode exhaust gas flow as a cooling medium to cool the drive device, thereby eliminating the need for a separate coolant supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate coolant supply system is used to cool the drive device, then the cooling effectiveness is improved, but the system complexity and component count increase
Solution Approach 1:
The patent merges the cooling function with the existing exhaust gas flow path by thermally coupling the heat sink to the water separator. The exhaust gas that would otherwise be wasted is now utilized as a cooling medium, eliminating the need for a separate coolant supply system while maintaining effective cooling of the drive device
Solution Approach 2:
The system uses its own exhaust gas flow to cool the drive device through the thermally coupled heat sink. The exhaust gas serves dual purposes: it is both a byproduct of fuel cell operation and a cooling medium, allowing the system to cool itself without external coolant infrastructure
2Productivity
If the recirculation fan operates continuously to maintain fuel flow, then the fuel cell performance is improved, but the energy consumption and heat generation increase
Solution Approach 1:
The patent converts the harmful waste heat generated by the recirculation fan into a beneficial cooling resource. The exhaust gas flow, which carries thermal energy, is directed through the heat sink to cool the drive device, transforming what would be wasted energy into a useful cooling function that reduces overall system energy consumption
3Reliability
If water separation is implemented in the recirculation path, then water accumulation on the anode is reduced, but the system complexity increases
Solution Approach 1:
The water separator is designed to perform multiple functions simultaneously: it separates liquid water from the exhaust gas flow to prevent anode flooding, and it provides thermal coupling to the heat sink to enable cooling of the drive device. This multi-functionality reduces the need for additional components while improving water management
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 simplifies the system design, improves energy efficiency, and reduces the load on the conveyor device by effectively utilizing the anode exhaust gas flow for cooling, thus enhancing the recirculation fan's performance and extending its service life.
Implementation Method 1
a heat sink which is thermally coupled to the water separator in order to cool the drive device
Implementation Method 2
utilizing the anode exhaust gas flow as a cooling medium to cool the drive device
Data Source
AI summary
The invention relates to a recirculation assembly for a fuel cell system, comprising a water separator, which can be connected to a fuel outlet of a fuel cell assembly, for at least partly separating liquid water from an exhaust gas flow coming from the fuel outlet and comprising a recirculation fan with a conveyor device, which has a fan inlet connected to the water separator and a fan outlet that can be connected to a fuel inlet of the fuel cell assembly and which is designed to convey a gas flow, and a drive device for driving the conveyor device, comprising a heat sink which is thermally coupled to the water separator in order to cool the drive device.