Fuel Cell Rail Cooling Using Residual Water Evaporation
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Solution Overview
Problem
Current railway vehicle cooling systems for fuel cell power modules are inefficient, consuming significant power and occupying large volumes due to the use of bulky heat exchangers and large air flows, which negatively impacts cost and efficiency.
Innovation Solution
A railway vehicle with a cooling cycle that includes a heat exchanger receiving heated refrigerant and cooling air, producing cooled refrigerant and heated air, along with a precooling system that evaporates water in air to produce cooling air, reducing the need for large air flows and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If bulky heat exchangers and powerful fans are used to cool the fuel cell power module, then the cooling effectiveness is improved, but the volume occupied and power consumption increase significantly
Solution Approach 1:
The patent uses evaporative cooling where water evaporates to absorb heat from the fuel cell power module. The phase transition from liquid water to water vapor provides efficient cooling without requiring bulky heat exchangers or powerful fans, thus reducing the cooling system volume while maintaining effective temperature control.
Solution Approach 2:
The cooling system utilizes the fuel cell's own residual water for evaporative cooling, eliminating the need for external cooling media and reducing the requirement for large heat exchangers. The system serves itself by using its waste product (residual water) as the cooling agent.
2Temperature
If bulky heat exchangers and powerful fans are used to cool the fuel cell power module, then the cooling effectiveness is improved, but the power consumption increases
Solution Approach 1:
Evaporative cooling leverages the phase transition of water from liquid to vapor, which absorbs significant latent heat. This natural phase change process provides efficient cooling without requiring powerful fans or energy-intensive mechanical compression, thereby reducing power consumption while maintaining effective temperature control.
Solution Approach 2:
The system uses residual water from the fuel cell operation itself as the cooling medium. This self-service approach eliminates the need for external cooling systems and reduces power consumption by utilizing the fuel cell's own waste product for cooling purposes.
3Productivity
If residual water is collected and used for evaporative cooling, then the cooling system efficiency is improved, but water management complexity increases
Solution Approach 1:
The fuel cell system uses its own residual water for evaporative cooling, creating a self-contained water management loop. This self-service approach improves cooling efficiency by utilizing available water resources while minimizing the need for external water management infrastructure, thereby reducing overall system complexity despite the evaporative cooling process.
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 proposed solution reduces the power consumption and volume of the cooling system, making it more cost-efficient and effective in maintaining the fuel cell power module at a normal working temperature while reducing CO2 emissions.
Implementation Method 1
a precooling system adapted for receiving at least one stream of water from the reservoir and at least one stream of air and for evaporating part of the stream of water in the stream of air in order to cool the stream of air
Implementation Method 2
a heat exchanger configured for receiving at least one stream of heated refrigerant from the fuel cell power module and at least one stream of cooling air, and for producing at least one stream of cooled refrigerant and at least one stream of heated air
Data Source
AI summary
A railway vehicle including: a propulsion module, a fuel cell power module, a cooling cycle including at least one heat exchanger for receiving a stream of heated refrigerant from the fuel cell power module and a stream of cooling air, and for producing a stream of cooled refrigerant and a stream of heated air, the fuel cell power module being adapted for receiving the stream of cooled refrigerant and producing the stream of heated refrigerant, a reservoir for collecting residual water from the fuel cell power module, a precooling system for receiving a stream of water from the reservoir and a stream of air and for evaporating part of the stream of water in the stream of air in order to obtain the stream of cooling air.