Fuel Cell Cooling via Cryogenic Fuel and Thermal Actuator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fuel cells often require additional cooling mechanisms when ambient heat transfer is insufficient, such as in vacuum or underwater environments, to maintain thermal control and prevent thermal damage.
Innovation Solution
The implementation of a fuel cell system with a primary coolant loop and a secondary coolant heat exchanger, where a control valve and thermal actuator regulate the flow of coolant fluid to manage temperature, using cryogenic fluids as coolant to absorb excess heat and maintain the fuel cell within a defined operating temperature window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a dedicated coolant loop is used to cool the fuel cell, then temperature control is improved, but device complexity increases
Solution Approach 1:
The patent combines the coolant loop with the fuel supply system by routing the fuel line through the heat exchanger. The fuel serves dual purposes: as a reactant for the fuel cell and as a coolant medium to absorb excess heat. This integration reduces the number of separate cooling components needed while maintaining effective temperature control.
Solution Approach 2:
The fuel line is designed to perform multiple functions: supplying fuel to the fuel cell, acting as a heat transfer medium in the heat exchanger, and serving as part of the cooling system. This multi-functionality eliminates the need for dedicated cooling components, simplifying the overall system while maintaining temperature control.
2Device complexity
If heat is allowed to dissipate to the surrounding environment, then device complexity is reduced, but temperature control reliability deteriorates in vacuum or underwater environments
Solution Approach 1:
The system uses the fuel itself as the coolant medium. The fuel circulating through the heat exchanger automatically absorbs excess heat from the fuel cell without requiring external cooling infrastructure. This self-service approach ensures reliable temperature control in any environment, including vacuum or underwater conditions where ambient cooling is ineffective.
3Temperature
If a thermal actuator and control valve are added to regulate coolant flow, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The thermal actuator is positioned to receive hot coolant from the fuel cell and automatically responds to temperature changes by expanding or contracting, thereby regulating the flow of fuel through the heat exchanger. This feedback mechanism maintains precise temperature control without requiring complex external control systems.
Solution Approach 2:
The thermal actuator serves as an intermediary between the hot coolant and the fuel flow control. It translates thermal energy from the coolant into mechanical motion that regulates the fuel flow, providing precise temperature control while keeping the control system simple and integrated within the existing fuel delivery infrastructure.
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 removes excess thermal energy from fuel cells, ensuring stable operation and preventing thermal damage by actively controlling temperature through a passive thermal actuator mechanism, even in environments where ambient cooling is inadequate.
Implementation Method 1
The primary coolant loop and the fuel supply line pass through a fuel supply line heat exchanger in which heat transfers from the coolant fluid in the primary coolant loop to fuel fluid in the fuel supply line
Implementation Method 2
a thermal actuator is located in the primary coolant loop. The thermal actuator and the control valve control the flow of fuel through the secondary coolant heat exchanger based on the temperature of the coolant fluid in contact with the thermal actuator
Data Source
AI summary
A fuel cell system is disclosed in which a fuel or oxidant fluid is used as a coolant fluid that functions as a heat sink a fuel cell.