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 constant fluid temperature under varying conditions, such as changing water flow rates, due to limitations in the number of available specific resistances and the need for complex mechanical mechanisms or numerous electrodes.
Innovation Solution
The use of a heater with a structure of non-uniformly spaced electrodes and shunting switches allows for the formation of additional connection schemes, providing a wide range of specific resistances without the need for many electrodes, enabling rapid adjustment of heating rates through selective electrode connections and shunt formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical mechanisms are used to move electrodes closer relative to one another to vary heating rate, then the heating rate can be adjusted, but the device complexity increases due to complex mechanical elements including moving parts exposed to the fluid
Solution Approach 1:
The patent replaces the mechanical system for moving electrodes with an electrical switching system. Instead of physically relocating electrodes to change spacing, the invention uses power switches to selectively connect different electrode pairs to the power supply, thereby changing the effective heating path and heating rate without any mechanical motion. This eliminates all moving parts and mechanical complexity while maintaining heating rate adjustability.
Solution Approach 2:
The patent implements dynamic control of heating rate through electrical switching rather than mechanical movement. The power switches can rapidly change the connection configuration between electrodes and power supply poles, enabling quick response to changing conditions. This dynamic electrical reconfiguration provides the same functional effect as mechanical electrode movement but with faster response time and no mechanical wear.
2Adaptability or versatility
If an array of numerous electrodes is used with power switches to selectively connect different electrodes to poles, then a wide range of heating rates can be achieved, but the device complexity and cost increase
Solution Approach 1:
The patent segments the heating function into multiple electrode pairs that can be independently selected and combined through switching. Instead of using one large array of numerous electrodes, the invention divides the heating task into several smaller electrode pairs, each capable of providing a specific heating rate. The power switches selectively activate different combinations of these segmented electrode pairs, achieving a wide range of heating rates with fewer total electrodes.
Solution Approach 2:
The patent makes each electrode multi-functional by enabling it to serve different roles through selective switching. Each electrode can be connected to either pole or left unconnected, allowing the same electrode to participate in different heating configurations for different heating rates. This universality reduces the total number of electrodes needed compared to a system where each electrode has a fixed, single function.
3Adaptability or versatility
If mechanical mechanisms are used to adjust electrode spacing, then heating rate can be varied, but the response time is slow and cannot deal with rapidly changing conditions
Solution Approach 1:
The patent replaces the slow mechanical adjustment system with a fast electrical switching system. Electrical switches can change state in microseconds, compared to the seconds or minutes required for mechanical mechanisms to physically move electrodes. This substitution enables the heating system to respond rapidly to changing flow conditions or temperature requirements, maintaining adaptability while achieving much faster response times.
4Adaptability or versatility
If a substantial number of electrodes are used with selective connection schemes, then different heating rates can be achieved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The patent segments the electrode array into smaller functional units that can be manufactured and assembled more efficiently. Instead of manufacturing one large complex electrode array with numerous electrodes, the invention divides the system into smaller electrode pairs or groups that are simpler to manufacture. The switching mechanism then combines these simpler segments to achieve the desired heating rates, reducing overall manufacturing complexity and cost.
Solution Approach 2:
The patent enables individual electrodes or electrode pairs to be selectively activated or deactivated based on the required heating rate. Rather than requiring all electrodes to be permanently connected and functional, the switching system allows the system to 'discard' (deactivate) certain electrodes for particular operating conditions and 'recover' (activate) them when needed. This reduces the effective number of electrodes that need to be precisely manufactured and connected, lowering manufacturing costs.
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 larger number of unique heating rates with fewer electrodes, improving the heater's ability to maintain desired fluid temperatures across varying conditions without complex mechanical parts or excessive electrode count.
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.
Implementation Method 2
Two or more of the electrodes are connected to a power supply so that different electrical potentials are applied to different ones of the electrodes.
Data Source
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.