Ohmic Fluid Heater with Switchable Electrodes for Heating Rate Control
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Solution Overview
Problem
Existing ohmic fluid heaters struggle to rapidly adjust heating rates to maintain constant fluid temperature under varying conditions, such as changing water flow rates, due to limitations in electrode configurations and the need for complex mechanical or redundant electrical connections.
Innovation Solution
Incorporating a structure with non-uniformly spaced electrodes and the use of power switches and shunting switches to selectively connect and disconnect electrodes, allowing for a wide range of specific resistances and heating rates without additional electrodes, enabling flexible power delivery through various connection schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a substantial number of electrodes are provided with power switches to selectively connect different electrodes to power supply poles, then a wide range of heating rates can be achieved, but the device complexity and cost increase significantly
Solution Approach 1:
The heater divides the fluid heating path into multiple segments by providing several heating zones with electrodes spaced along the flow path. Each zone can be independently controlled by connecting specific electrodes to power supply poles, allowing selective heating of different fluid segments to achieve various overall heating rates without requiring every possible electrode combination to be switchable.
Solution Approach 2:
The electrodes serve multiple functions: they act as both heating elements when connected to power supply poles and as electrical isolation barriers when not connected. The same physical electrode structure enables both series and parallel electrical configurations of fluid paths, providing versatility in heating rate control without requiring separate mechanisms for different operating modes.
2Adaptability or versatility
If electrodes are mechanically moved closer relative to one another to vary heating rate, then heating rate control is achieved, but the mechanism requires complex mechanical elements with 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 adjusting electrode positions to change spacing and heating rate, the invention uses power switches to selectively connect different electrode pairs to the power supply, thereby changing the electrical configuration (series/parallel) and achieving heating rate variation without any mechanical movement or exposed moving parts.
3Reliability
If intermediate electrodes are electrically isolated from power supply poles, then fluid paths are connected in series providing high resistance and low heating rate, but the heating rate is limited and cannot be rapidly increased
Solution Approach 1:
The electrical configuration of the electrodes is made dynamic and adjustable rather than fixed. Power switches enable the system to transition between different connection schemes (series, parallel, or combinations) in response to changing flow conditions. When flow rate increases, the control system can rapidly switch from a series configuration (isolated intermediate electrodes) to a parallel configuration (all electrodes connected), providing quick response and maintaining temperature stability without the delays inherent in mechanical adjustment systems.
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 allows for a broader range of specific resistances and heating rates, reducing the number of electrodes required and enhancing the heater's ability to maintain desired fluid temperatures across different conditions without redundant connections.
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
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AI summary
An ohmic heater for heating a conductive fluid has a plurality of electrodes mounted to a structure with spaces between the electrodes. The electrodes (14) are selectively connect to poles (38, 40) of a power supply, so that some electrodes are connected to the poles and others remain isolated from the poles. Shunting switches are provided for connecting two or more of the isolated electrodes to one another. The shunting switches allow formation of a large number of different connection schemes having a variety of different electrical conduction paths through fluid in the spaces and a variety of resistances between the poles with relatively few electrodes and spaces.