Fuel Cell Cooling Bypass Layout for Low-Temperature Warm-Up
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel cell systems face challenges in efficiently increasing the temperature of the fuel cell in low-temperature environments, leading to low power generation efficiency due to the provision of an intercooler in the second cooling flow path, which hinders rapid temperature increase.
Innovation Solution
A fuel cell cooling system with a bypass flow path in the second cooling flow path, allowing refrigerant to bypass the radiator when the first cooling flow path temperature is below a reference value, and routing refrigerant through an intermediate heat exchanger and intercooler to maintain temperature, combined with speed adjustments of refrigerant circulation based on temperature thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the refrigerant is supplied to the intercooler in a low-temperature environment, then the compressed air can be cooled efficiently, but the temperature of the fuel cell is unlikely to increase due to heat transfer through the intermediate heat exchanger
Solution Approach 1:
The system dynamically switches between two operational modes based on temperature conditions: a first operation mode for low-temperature environments where the refrigerant bypasses the radiator to prevent excessive cooling, and a second operation mode for normal temperatures where the refrigerant flows through the radiator for efficient cooling. This dynamic adaptation resolves the contradiction by adjusting the system behavior according to environmental conditions.
Solution Approach 2:
The system changes the flow path parameters of the refrigerant based on temperature conditions. When the fuel cell temperature is below a reference value, the refrigerant is directed through a bypass flow path that avoids the radiator, preventing excessive heat transfer. When the temperature is adequate, the refrigerant flows through the radiator for efficient cooling. This parameter change resolves the contradiction between maintaining temperature and achieving power generation efficiency.
2Productivity
If the refrigerant circulates through the radiator and intermediate heat exchanger, then the fuel cell can be efficiently cooled, but the temperature increase is suppressed in low-temperature environments
Solution Approach 1:
The system employs dynamic flow path switching based on temperature feedback. A temperature detection device monitors the fuel cell temperature and controls the flow path switching device to adjust refrigerant circulation accordingly. This dynamic control allows the system to optimize between cooling efficiency and temperature maintenance based on real-time conditions.
Solution Approach 2:
The system uses temperature feedback from the fuel cell to control the refrigerant flow path. When the temperature is low, the feedback signal triggers the bypass mode to prevent excessive cooling. When the temperature is adequate, the feedback signal enables the radiator mode for efficient cooling. This feedback mechanism resolves the contradiction by continuously adapting the cooling intensity to maintain optimal temperature.
3Temperature
If a bypass flow path is provided in parallel to the radiator, then the refrigerant can bypass the radiator to maintain fuel cell temperature, but the system complexity increases
Solution Approach 1:
The cooling system is segmented into multiple flow paths: a first cooling flow path through the fuel cell, a second cooling flow path through the radiator, and a bypass flow path parallel to the radiator. The intermediate heat exchanger connects these paths, allowing selective refrigerant circulation. This segmentation enables temperature control while maintaining a relatively simple overall structure.
Solution Approach 2:
The refrigerant circulation system serves multiple functions through different flow path configurations: it can cool the fuel cell through the intermediate heat exchanger, cool the compressed air through the intercooler, or bypass the radiator to maintain temperature. The bypass flow path and flow path switching device enable this multi-functionality without requiring entirely separate systems, thus managing complexity.
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 system effectively maintains and increases the temperature of the fuel cell, enhancing power generation efficiency by reducing heat transfer reduction and facilitating efficient cooling through the intercooler and intermediate heat exchanger.
Implementation Method 1
an intermediate heat exchanger configured to perform heat exchange between the first cooling flow path and the second cooling flow path
Implementation Method 2
The intercooler cools the compressed air by heat exchange with the refrigerant in the second cooling flow path
Implementation Method 3
a radiator provided in the second cooling flow path
Data Source
AI summary
In the fuel cell cooling system, a first cooling flow path, a fuel cell, a second cooling flow path, a radiator, an intercooler, an intermediate heat exchanger, and a bypass flow path, and during power generation of the fuel cell, when the temperature of the refrigerant in the first cooling flow path is lower than the first reference value, a first operation for circulating the refrigerant in the second cooling flow path is performed in a path passing through the intermediate heat exchanger, the intercooler, and the bypass flow path, and when the temperature of the refrigerant in the first cooling flow path is higher than the first reference value, a second operation for circulating the refrigerant in the second cooling flow path is performed in a path passing through the intermediate heat exchanger, the intercooler, and the radiator.