Induction Heating Device for Fuel Cell Coolant
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Solution Overview
Problem
Conventional fuel cell systems face challenges in compact design, high manufacturing costs, reduced assemblability and maintainability, and coolant leakage due to direct contact between cartridge resistance heaters and coolant, which complicates rapid heating and power control during cold start-up.
Innovation Solution
An induction heating device with an insulating housing in the coolant circulation line, featuring an induction coil and high frequency controller outside the housing, allowing for precise power control and insulation, and a heater with a honeycomb structure for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cartridge resistance heaters are used to heat coolant, then the coolant can be heated, but the volume of the housing is significantly increased
Solution Approach 1:
The patent replaces the conventional resistance heater system with an induction heating system. The induction coil generates an electromagnetic field that induces eddy currents in the heater, which then generates heat through resistive heating. This substitution reduces the housing volume by approximately 50% compared to conventional resistance heaters while achieving the same coolant heating function.
Solution Approach 2:
The patent changes the heating mechanism from direct resistive heating to induction heating with eddy currents. By changing the physical principle of heating from direct electrical resistance to electromagnetic induction, the system achieves more compact dimensions while maintaining effective heat transfer to the coolant.
2Temperature
If cartridge resistance heaters are used to heat coolant, then the coolant can be heated, but the manufacturing cost increases and assemblability and maintainability are reduced
Solution Approach 1:
The induction heating system replaces the complex resistance heater assembly with a simpler electromagnetic induction system. The induction coil and heater can be manufactured as separate components and assembled more easily, reducing manufacturing complexity and cost while improving maintainability.
Solution Approach 2:
The heating system is divided into separate functional components: the induction coil, the heater, and the insulating housing. This segmentation allows for independent manufacturing, easier assembly, and improved maintainability compared to the integrated resistance heater system.
3Temperature
If cartridge resistance heaters are in direct contact with coolant, then heating is efficient, but coolant leakage occurs due to O-ring deformation at high temperatures
Solution Approach 1:
The patent introduces an insulating housing as an intermediary barrier between the heater and the coolant. This housing maintains electrical insulation while allowing thermal energy to transfer to the coolant through the housing walls, preventing coolant leakage and insulation failure that occurs with direct contact resistance heaters.
Solution Approach 2:
The induction heating system eliminates the need for O-rings and direct mechanical contact between the heater and coolant. The electromagnetic field penetrates the insulating housing to heat the heater, which then transfers heat to the coolant without requiring direct electrical contact, thereby preventing insulation failure.
4Productivity
If high density heating elements are used, then heating efficiency is improved, but the volume of the housing is significantly increased
Solution Approach 1:
The induction heating system replaces the bulky high-density resistance heater array with a compact induction coil and heater configuration. The electromagnetic field enables efficient heating with significantly reduced volume, achieving the same heating productivity in a much more compact form factor.
Solution Approach 2:
The patent changes the heating density approach from high-density resistance elements requiring large spacing to induction heating where the electromagnetic field can concentrate energy more efficiently in a smaller volume, maintaining heating efficiency while reducing overall housing volume.
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
Enables rapid coolant heating, precise power consumption control based on fuel cell stack voltage, and improved insulation, enhancing cold start-up efficiency and preventing coolant leakage.
Implementation Method 1
an induction coil (32) mounted on the outer surface of the housing (31) and generating an induced current
Implementation Method 2
a heater (34) disposed to be in direct contact with the coolant in the housing (31) and generating heat via the induced current
Implementation Method 3
an insulating housing (31) which is provided in the coolant circulation line (14)... ensuring the insulation resistance by separating a heating unit, which is in contact with the coolant, from the outside
Data Source
AI summary
The present invention provides an induction heating device for a fuel cell system, which can rapidly heat coolant during cold start-up, control the power consumption depending on the voltage of a fuel cell stack, and ensure the insulation resistance by separating a heating unit, which is in contact with the coolant, from the outside. That is, the present invention provides an induction heating device for a fuel cell system, in which an insulating housing is provided in a coolant circulation line, a heater for heating coolant is provided in the housing, and a high frequency controller for controlling the power consumption of the heater is provided at the outside of the housing such that the coolant can be rapidly heated during cold start-up, precisely control the power consumption depending of the voltage of a fuel cell stack, and improve the insulation performance by separating the heater as a heating unit, which is in contact with the coolant, and the high frequency controller and a coil as a power unit with respect to the insulating housing.