Devices for ohmically heating a fluid
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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 different fluid conductivities, flow rates, and temperatures, without requiring complex mechanical components or additional electrodes that increase cost and size, especially in industrial and commercial applications.
Innovation Solution
A heater design featuring an irregular array of rod-like electrodes with varying spacings and a control circuit that dynamically adjusts electrode connections using power switches and shunting busses to provide a wide range of specific resistances, allowing for rapid and precise control of heating rates.
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 the fluid
Solution Approach 1:
The patent replaces the mechanical system for moving electrodes with an electrical switching system. Power switches selectively connect different electrodes to the power supply poles, creating variable heating rates through electrical reconfiguration rather than mechanical movement. This eliminates moving parts exposed to the fluid while maintaining heating rate adaptability.
Solution Approach 2:
The patent implements dynamic control of the heating system by allowing rapid switching between different electrode connection configurations. The control circuit can quickly reconfigure which electrodes are active and how they are connected, enabling the system to respond dynamically to changing flow rates and temperature requirements without mechanical movement.
2Adaptability or versatility
If additional electrodes are added to provide multiple heating rates, then heating rate versatility improves, but device complexity and cost increase
Solution Approach 1:
The patent divides the heating system into multiple electrode segments that can be independently controlled. By having multiple intermediate electrodes between the extreme electrodes, the system can selectively activate different segments or combinations of segments to achieve various heating rates. This segmentation allows versatile control without requiring a completely new electrode array for each heating rate.
Solution Approach 2:
The patent uses dynamic switching to reconfigure the electrical connections between electrodes based on required heating rates. The power switches enable the system to dynamically select which electrodes are connected to which power supply poles, creating different effective resistance values and heating rates from the same physical electrode array. This eliminates the need for multiple fixed electrode configurations.
3Adaptability or versatility
If electrodes are spaced irregularly to provide wide range of specific resistances, then heating rate adaptability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent achieves a wide range of specific resistances by changing the electrical connection parameters rather than relying solely on physical electrode spacing. The power switches enable different electrical configurations (series, parallel, and combinations) of the same physical electrode array, creating varied effective resistance values. This allows the system to achieve heating rate adaptability through electrical parameter changes while maintaining simpler, more uniform physical electrode spacing.
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 solution enables a compact, cost-effective heater that can maintain consistent fluid temperatures by offering a wide range of heating rates, reducing mechanical complexity and electrode redundancy, and accommodating diverse operating conditions.
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.