Induction Fluid Heater With Isolated Coil and In-Channel Surface Elements
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Solution Overview
Problem
Existing heating devices for liquid media suffer from delayed heating due to heat generation in areas separate from the fluid passage, resulting in inefficient heat transfer.
Innovation Solution
A heating device with a housing containing a fluid channel and an alternating magnetic field generator outside the channel, using metallic surface heating elements within the channel for direct fluid contact, allowing fluid flow on both sides of the elements for enhanced heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PTC heating element is placed outside the fluid channel, then the electrical system is isolated from the fluid, but heat transfer efficiency is reduced due to contact resistance
Solution Approach 1:
The patent introduces a metallic surface heating element as an intermediary component that is directly exposed to the fluid channel. This mediator transfers magnetic energy from the external coil to the fluid through direct contact, solving the contradiction by maintaining electrical isolation while achieving efficient heat transfer. The metallic surface element acts as the intermediate carrier that converts electromagnetic energy to thermal energy at the fluid interface.
Solution Approach 2:
The patent replaces the traditional direct electrical heating mechanism with an electromagnetic induction system. Instead of using electrical contacts or resistive heating elements within the fluid channel, the system uses an alternating magnetic field generated by an external coil to induce eddy currents in a metallic surface element, which then heats the fluid. This substitution eliminates the need for mechanical or electrical contact with the fluid while maintaining heating efficiency.
2Loss of energy
If a PTC heating element is placed inside the fluid channel, then heat transfer efficiency is improved, but electrical isolation from the fluid is compromised
Solution Approach 1:
The metallic surface heating element serves as an intermediary that is exposed to the fluid channel, allowing efficient heat transfer while the alternating magnetic field generator remains electrically isolated outside the channel. This mediator approach enables thermal coupling without electrical coupling.
Solution Approach 2:
The system replaces direct electrical heating elements within the fluid with an electromagnetic induction system where the heating occurs through induced eddy currents in a metallic surface element that is thermally coupled to the fluid. This substitution achieves both efficient heat transfer and electrical isolation simultaneously.
3Reliability
If the heating element is separated from the fluid flow path, then electrical safety is improved, but heating speed is reduced
Solution Approach 1:
The patent replaces slow conductive heat transfer through walls with rapid electromagnetic heating. The alternating magnetic field induces eddy currents in the metallic surface element, generating heat directly at the fluid interface through resistive heating of the induced currents. This achieves fast heating speeds while maintaining electrical safety through non-contact electromagnetic coupling.
Solution Approach 2:
The metallic surface heating element acts as an intermediary that is thermally coupled to the fluid flow path but electrically isolated from it. This mediator enables rapid heat transfer to the fluid while the actual heating element remains electrically isolated and safe.
4Loss of time
If the heating element is placed directly in the fluid flow, then heating speed is improved, but electrical isolation is compromised
Solution Approach 1:
The system substitutes direct electrical contact heating with electromagnetic induction heating. The alternating magnetic field generator is positioned outside the fluid channel, and the metallic surface element exposed to the fluid converts electromagnetic energy to thermal energy through induced eddy currents. This achieves rapid heating speed while maintaining complete electrical isolation from the fluid.
Solution Approach 2:
The metallic surface heating element serves as an intermediary that is thermally exposed to the fluid flow for rapid heat transfer, while the actual electromagnetic field generator remains electrically isolated outside the channel. This mediator approach resolves the contradiction between heating speed and electrical isolation.
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 enables rapid and effective heating of the fluid by separating the electrical system and positioning the surface heating elements within the fluid flow, improving heat transfer efficiency.
Implementation Method 1
an element that generates an alternating magnetic field being provided in the housing, which is sealed off from the fluid channel by at least one wall, with at least one metallic surface heating element being provided, which can be heated by the alternating magnetic field
Implementation Method 2
The surface heating element is preferably in direct contact with the fluid flowing through the fluid channel. This achieves good and rapid heating of the fluid.
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
The device (20) has a housing (21) comprising a fluid channel (22) with a fluid inlet (23) and a fluid outlet (24). An alternating magnetic field generating element (29) i.e. coil, is arranged in the housing. The element is sealed from the channel by a wall (30), and metallic surface heating elements (32, 33) are heated by alternating magnetic field. The heating elements are arranged in the channel, where fluid medium flows through the heating elements. The field generating element is designed as a hollow-cylindrical element, where the wall is made from magnetic field transparent material.