Fuel Cell Cooling Control for Fan-Pump Power Balancing
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Solution Overview
Problem
Fuel cell systems face inefficiencies due to increased power consumption of cooling fans and pumps as their RPMs increase, leading to potential deterioration in cooling performance and overall system efficiency.
Innovation Solution
A controller optimizes the RPMs of the cooling fan and pump by decreasing the fan's RPM and increasing the pump's RPM to maintain a specified coolant temperature at the fuel cell stack inlet while minimizing total power consumption, using a method that adjusts based on temperature thresholds and power consumption measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the RPMs of the cooling fan and pump are increased to improve cooling capacity, then cooling performance is improved, but power consumption increases quadratically
Solution Approach 1:
The patent implements dynamic RPM adjustment for both the cooling fan and pump based on real-time coolant temperature monitoring. The controller continuously optimizes the operating speeds to match actual cooling demands, avoiding the quadratic power consumption increase associated with consistently high RPM operation while maintaining adequate cooling capacity.
Solution Approach 2:
The system changes the operational parameters (RPMs) of the cooling fan and pump from fixed preset values to dynamically optimized values. By adjusting these parameters based on temperature conditions and power consumption considerations, the system achieves better cooling efficiency without excessive energy use.
2Use of energy by moving object
If the cooling fan RPM is decreased to reduce power consumption, then power consumption is reduced, but cooling performance may deteriorate
Solution Approach 1:
The pump serves as an intermediary element that compensates for reduced cooling fan RPM. By increasing pump speed to improve coolant circulation, the system maintains cooling effectiveness even when the cooling fan operates at lower, more energy-efficient speeds. This mediation allows decoupling of fan RPM from direct cooling performance dependency.
Solution Approach 2:
The system dynamically balances the RPMs of the cooling fan and pump based on operating conditions. When fan RPM is reduced for energy efficiency, pump RPM is increased to maintain adequate coolant flow and heat transfer, ensuring cooling performance is preserved through adaptive parameter adjustment.
3Productivity
If the pump RPM is increased to improve coolant circulation, then cooling efficiency is improved, but power consumption increases
Solution Approach 1:
The controller dynamically adjusts pump RPM based on real-time temperature monitoring and cooling demands. Rather than operating at constantly high speeds, the pump RPM is optimized to match actual cooling requirements, improving cooling efficiency when needed while reducing energy consumption during lower-demand periods.
Solution Approach 2:
The system employs feedback control where the controller monitors coolant temperature and uses this information to adjust pump RPM accordingly. This closed-loop control ensures the pump operates at the minimum necessary speed to achieve cooling objectives, optimizing the balance between cooling efficiency and power 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
This approach enhances cooling performance while reducing power consumption, thereby improving the efficiency and reliability of the fuel cell system by efficiently managing the cooling process.
Implementation Method 1
a cooling fan that cools a coolant
Implementation Method 2
a pump that pumps the coolant
Implementation Method 3
A fuel cell system may generate electrical energy using a fuel cell stack. For example, when hydrogen is used as a fuel for a fuel cell stack, it may be an alternative to solve global environmental problems
Implementation Method 4
a thermal management system (TMS) that releases heat of reaction of the fuel cell stack outside the system, controls an operating temperature of the fuel cell stack
Data Source
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AI summary
A fuel cell system includes a cooling fan that cools a coolant, a pump that pumps the coolant, and a controller communicatively connected with the cooling fan and the pump. The controller retrieves a preset cooling-fan RPM and a preset pump RPM, optimizes the cooling-fan RPM and the pump RPM through a decrease of the cooling-fan RPM and an increase of the pump RPM such that a coolant temperature at an inlet of a fuel cell stack satisfies a specified temperature condition and a total power consumption is minimized, the total power consumption being a sum of a power consumption corresponding to the cooling-fan RPM and a power consumption corresponding to the pump RPM, and stores the optimized cooling-fan RPM and the optimized pump RPM. Besides, it may be permissible to prepare various other embodiments speculated through the specification.