Rod-Electrode Array Ohmic Heater for Rapid Heating Rate Control
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Solution Overview
Problem
Existing ohmic fluid heaters struggle to rapidly adjust heating rates to maintain desired fluid temperatures under varying conditions, such as changing flow rates and fluid conductivity, often requiring complex mechanical elements or fixed resistance configurations that are costly and prone to damage in industrial settings.
Innovation Solution
A heater design featuring an irregular array of rod-like electrodes with varying spacings and power switches allows for a wide range of specific resistances, enabling rapid adjustment of heating rates through a control circuit that dynamically connects electrodes to power supply poles, using a control processing unit to maintain desired outlet temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical elements are used to move electrodes closer relative to one another to vary heating rate, then heating rate control is achieved, but device complexity increases and reliability decreases due to moving parts exposed to fluid
Solution Approach 1:
The patent replaces the mechanical system of moving electrodes with an electrical switching system. Instead of physically relocating electrodes to change spacing, the invention uses power switches to selectively connect different electrodes to power supply poles, thereby changing the electrical resistance and heating rate without any mechanical movement. This eliminates moving parts entirely while maintaining adaptability in heating rate control.
Solution Approach 2:
The patent implements dynamic control of heating rate through electrical switching rather than mechanical adjustment. The power switches can rapidly change the connection configuration of electrodes to power supply poles, enabling quick response to changing conditions such as flow rate variations, without the inertia and mechanical complexity associated with moving parts.
2Adaptability or versatility
If mechanical elements with moving parts are used to adjust electrode spacing, then heating rate varies, but reliability deteriorates due to moving parts exposed to fluid
Solution Approach 1:
The invention substitutes mechanical adjustment mechanisms with an electrical switching system. Power switches selectively connect electrodes to power supply poles, changing the effective resistance and heating rate without any physical movement of electrodes. This eliminates moving parts that would be exposed to fluid and prone to failure in industrial settings, significantly improving reliability while maintaining heating rate adjustability.
3Adaptability or versatility
If a substantial number of electrodes with power switches are provided to selectively connect electrodes to power supply poles, then heating rate control improves, but device complexity and cost increase
Solution Approach 1:
The patent divides the heating element into multiple electrode segments that can be independently connected to power supply poles. By selectively activating different combinations of electrodes, the system achieves a wide range of heating rates. The irregular spacing of electrodes creates different resistance values, and the segmentation allows flexible configuration to match various heating requirements without needing excessive components.
Solution Approach 2:
The invention changes the electrical resistance parameter by selectively connecting different electrodes to power supply poles. The irregular spacing of electrodes provides inherently different resistance values between adjacent electrodes. By switching which electrodes are connected, the system varies the effective resistance and thus the heating rate, achieving adaptability through parameter changes rather than through increasing the number of components.
4Ease of manufacture
If fixed resistance configurations are used in ohmic heaters, then manufacturing is simpler, but adaptability to varying conditions deteriorates
Solution Approach 1:
The patent transforms the fixed resistance configuration into a dynamic system through electrical switching. While the physical electrode positions remain fixed (maintaining manufacturing simplicity), the electrical connection configuration is made dynamic via power switches. This allows the heater to adapt to varying flow rates and fluid conductivity by selectively connecting different electrode combinations, achieving both ease of manufacture and adaptability.
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 design provides a compact, cost-effective solution that can handle varying conditions with precise temperature control, reducing mechanical complexity and enhancing durability for industrial applications.
Implementation Method 1
Electricity passes between the electrodes through the fluid at least one space between the electrodes, and electrical energy is converted to heat by the electrical resistance of the fluid
Data Source
AI summary
A heater for heating a conductive liquid includes a two-dimensional array of rod-like electrodes (22, 122, 322, 422, 522) extending parallel to one another, an electrical power supply having a plurality of poles, and power switches to connect different ones of the electrodes to different poles so that current flows between the poles through the liquid. The array desirably includes outer electrodes defining the boundary (24, 424) of the array and inner electrodes disposed within this boundary. The array may have regular or irregular spacings between the electrodes. The array can provide numerous different connection schemes to vary the electrical resistance between the poles and thus vary the heating rate. The array can be arranged to provide substantially equal currents through three poles of a three-phase power supply.