Modular Fuel Cell Cooling Circuit with Segmented Pumps
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Solution Overview
Problem
The existing modular fuel cell systems face inefficiencies in cooling circuit pumps, which are sized for maximum flow rates, leading to degraded efficiency at low flow rates and potential inability to deliver flow when only one stack is used, due to variable pump performance across flow ranges.
Innovation Solution
The cooling circuit comprises separate pumps for each parallel branch, structurally linked to corresponding modular stacks, with electronic logic to independently regulate flow rates and temperature control, allowing for optimized pump sizing and real-time thermal regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pump is sized for maximum flow rates to supply all cooling branches, then the cooling capacity is sufficient for maximum power output, but the pump efficiency is degraded when operating at low flow rates with fewer stacks
Solution Approach 1:
The cooling circuit is segmented into multiple independent parallel branches, each with its own pump. This allows each pump to be sized for smaller, more efficient operation while collectively providing sufficient cooling capacity for maximum power output. Each pump operates independently in its optimal efficiency range regardless of the number of active stacks.
Solution Approach 2:
The system dynamically adapts the number of active cooling branches to match the number of active fuel cell stacks. When fewer stacks are operational, fewer cooling branches are active, and each corresponding pump operates at an optimized flow rate, maintaining high efficiency across varying system demands.
2Adaptability or versatility
If a single pump is sized for maximum flow rates, then it can handle the maximum number of stacks, but it may be unable to deliver flow below a certain minimum value
Solution Approach 1:
The cooling system is divided into multiple independent branches with individual pumps. Each pump is sized to provide adequate flow for its corresponding stack, ensuring that even with a single stack operating, the system can deliver the necessary minimum flow rate without the limitations of an oversized single pump.
Solution Approach 2:
The system changes the operational parameters by activating or deactivating specific cooling branches based on the number of active stacks. This allows the minimum flow delivery to be dynamically adjusted to match the actual cooling demand, avoiding the minimum flow limitations of a fixed oversized pump.
3Use of energy by moving object
If separate pumps are used in each cooling branch, then pump efficiency is optimized across varying flow rates, but the device complexity increases
Solution Approach 1:
The cooling system is segmented into modular branches with individual pumps. While this increases the number of components, each pump is simpler and more efficient for its specific duty. The modular architecture allows for easier maintenance and replacement, offsetting the initial complexity increase.
Solution Approach 2:
Each cooling branch with its pump is designed as a universal module that can be independently activated or deactivated. This multi-functional approach allows the same basic module configuration to handle varying system demands, reducing the need for complex variable speed control mechanisms on a single pump.
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 configuration enhances overall system efficiency by optimizing pump performance across varying flow rates, enabling efficient thermal management and flexible power adaptation without impacting active stacks, even in the event of module disconnection or failure.
Implementation Method 1
a heat exchanger for selective cooling of the coolant, said heat exchanger being arranged in a part of the cooling circuit common to all the stacks
Implementation Method 2
the cooling circuit comprises separate pumps arranged respectively in several of said branches of the cooling circuit
Data Source
AI summary
Fuel cell comprising several stacks (1, 2) of elementary fuel cell cells, at least part of the stacks (1, 2) being mounted in parallel and in a modular manner to allow the level of electrical power supplied by the cell (4) to be adapted by adapting the number of stacks (1, 2) present in the cell, the cell comprising a cooling circuit (5) comprising several branches (15, 25) in parallel for the selective cooling of said stacks (1, 2) by heat exchange, a heat transfer fluid being selectively circulated in the cooling circuit (5) via at least one pump, characterized in that the cooling circuit comprises separate pumps (11, 12) arranged respectively in several of said branches (15, 25) of the cooling circuit.