Fuel Cell Coolant Branch Defreezing for Cold-Start Components
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Solution Overview
Problem
Fuel cell systems face the risk of freezing due to the formation of ice in components when exposed to sub-zero temperatures, leading to operational failures.
Innovation Solution
A fuel cell system with a coolant branch line that directs heated coolant from the cooling circuit to dedicated components, such as the cathode side of the fuel cell stack, using thermal convection and heat exchange to defreeze these components without external heating sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric heaters are used to prevent freezing of components, then the reliability of the fuel cell system is improved, but the device complexity and energy consumption increase
Solution Approach 1:
The cooling circuit serves a dual function: it cools the fuel cell stack during operation and simultaneously heats components to prevent freezing during start-up. The coolant circulating through the cooling circuit automatically transfers heat from the operating stack to frozen components without requiring external heating devices, making the system self-sufficient for both cooling and anti-freezing functions
Solution Approach 2:
The cooling circuit is designed to perform multiple functions: it cools the fuel cell stack during normal operation, and the same circuit is used to heat components to prevent freezing during cold start-up. This multi-functionality eliminates the need for separate heating systems, reducing device complexity while maintaining reliability
2Reliability
If electric heaters are installed to defreeze components, then the reliability is improved, but the use of energy increases
Solution Approach 1:
The heat generated by the fuel cell stack during operation, which would otherwise be waste heat requiring dissipation, is redirected to heat components and prevent freezing. The cooling circuit captures this thermal energy and transfers it to frozen components, converting what would be harmful overheating into beneficial heating, thereby preventing freezing without additional energy consumption
Solution Approach 2:
Instead of discarding the heat generated by the fuel cell stack through traditional cooling, the system recovers this thermal energy by using the cooling circuit to transfer heat to components that need warming. This heat recovery approach prevents freezing while reducing overall energy consumption by utilizing internally generated thermal energy
3Use of energy by moving object
If the fuel cell stack operates in sub-zero temperatures without heating, then the energy consumption is reduced, but the components may freeze and block the system
Solution Approach 1:
The fuel cell stack heats itself and its associated components through the cooling circuit during operation. The coolant circulating through the stack absorbs heat and automatically transfers it to components that need warming, ensuring the system remains operational in cold temperatures without requiring external energy input for heating
Solution Approach 2:
The cooling circuit continuously circulates coolant that absorbs heat from the operating fuel cell stack and transfers it to components at risk of freezing. This continuous heat transfer process ensures uninterrupted operation by preventing ice formation in real-time, maintaining operational continuity without additional energy consumption
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
Facilitates fast start-up by automatically defreezing critical components, ensuring the fuel cell system operates efficiently without the need for additional energy-consuming heaters.
Implementation Method 1
the heat generated by the starting fuel cell stack will heat the coolant of the cooling circuit
Implementation Method 2
heat is easily transported to the dedicated component of the fuel cell system. A temperature of the dedicated component, hence, will increase
Implementation Method 3
the warming coolant may automatically move in the cooling circuit due to its thermal expansion
Implementation Method 4
the coolant may change its state of aggregation, such as changing from a liquid to a gaseous state when exceeding a certain temperature
Data Source
AI summary
A fuel cell system capable of defreezing a dedicated component by guiding a coolant via a coolant branch line from a fuel cell stack to the dedicated component which may be a water separator, an exhaust water pipe, a valve, a water tank, or a combination thereof. Also a vehicle comprising such fuel cell system.