Ohmic heater with multiple operating states
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Solution Overview
Problem
Existing ohmic liquid heaters face challenges in efficiently managing varying liquid conductivity and heat demand within a compact structure, as they often require multiple electrode pairs and complex switching mechanisms to achieve a wide range of heating rates.
Innovation Solution
An ohmic heater with a structure defining a flow path and multiple electrode pairs, each pair configured to provide different specific resistances, combined with a controller to switch between these states and adjust voltage, allowing for a wide range of heating rates and resistances without exceeding circuit limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple electrode pairs with different specific resistances are used to achieve a wide range of heating rates, then the adaptability to varying liquid conductivity and heat demand is improved, but the device complexity increases due to numerous electrode pairs and complex switching mechanisms
Solution Approach 1:
The heater is divided into multiple heating zones, each with its own pair of electrodes. Each zone can be independently controlled to provide different heating rates based on local requirements, allowing the system to adapt to varying liquid conductivity and heat demand without requiring a single complex switching mechanism for all electrodes
Solution Approach 2:
The system dynamically adjusts the heating rate by selectively activating different electrode pairs or combinations of electrodes based on real-time feedback from temperature sensors and conductivity measurements. This dynamic control allows the heater to respond to changing conditions without requiring physical reconfiguration of the electrode structure
2Productivity
If closely spaced electrodes are used to provide high current and high heating rate, then the productivity is improved, but the specific resistance becomes too low for certain heating requirements
Solution Approach 1:
The electrode system is segmented into multiple pairs with different spacing configurations. Closely spaced electrode pairs provide high heating rates when needed, while more widely spaced pairs provide higher specific resistance for different operating conditions. This segmentation allows the system to achieve both high productivity and adaptability across different heating requirements
Solution Approach 2:
Different regions of the heater have locally optimized electrode spacing. Some regions have closely spaced electrodes for high heating rate requirements, while other regions have more widely spaced electrodes for lower specific resistance applications. This local quality optimization allows each zone to operate at its optimal performance point
3Adaptability or versatility
If numerous electrode pairs are used to cover a wide range of specific resistances, then the adaptability is improved, but the device complexity and volume increase
Solution Approach 1:
Each electrode pair is designed to serve multiple functions by being controllable in different combinations and configurations. The same physical electrode structure can provide different specific resistances depending on which electrodes are activated and how they are connected, eliminating the need for numerous separate electrode pairs and reducing overall heater volume
Solution Approach 2:
Multiple electrode pairs are merged into a single integrated heating system with common control electronics and shared structural support. This merging allows the system to achieve a wide range of specific resistances through electronic control of electrode combinations rather than requiring physically separate electrode assemblies for each resistance value
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 efficient heating across varying liquid conductivities and heat demands, maintaining circuit safety and compactness by utilizing a simple control scheme or pulse width modulation to adjust specific resistances and voltages.
Implementation Method 1
An electrical voltage is applied between electrodes and a current passes between the electrodes through the liquid so that the liquid is heated by power dissipated in the electrical resistance of the liquid itself
Data Source
AI summary
An ohmic heater has a structure (20) defining a flow path extending in a downstream direction (D), a first pair of electrodes (34a,34b) and a second pair of electrodes (36a,36b). The electrodes of each pair are adjacent one another in the downstream direction but spaced from one another in a direction perpendicular to the downstream direction; the pairs of electrodes are spaced apart from one another in the downstream direction. An electrical circuit (40,42,44,46,48,50) is operative to apply a voltage (i) between the electrodes (34a,34b) of the first pair; or (ii) between the electrodes (36a,36b) of the second pair; or (iii) between at least one electrode (34a) of the first pair and at least one electrode (36b) of the second pair, and may vary the applied voltage. The heater can meet varying conditions such as changes in conductivity of the liquid flowing through the heater.