Dual-Element Heating Assembly for Flexible Water Heater Control
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Solution Overview
Problem
Conventional water heaters face limitations in controlling water temperature due to simple on/off heating mechanisms, which fail to account for usage patterns and external factors, leading to thermal and electric fatigue.
Innovation Solution
A heating assembly for water heaters comprising two electric heating elements, one secured to a base and independently switchable to provide different heat ratings, with a controller to manage these elements for varied heating patterns and extend the heater's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single heating element is used with on/off control, then the device complexity is low, but the temperature control precision and adaptability are insufficient
Solution Approach 1:
The heating element is divided into multiple independent segments or zones that can be controlled separately. This allows different portions of the heating element to be activated based on specific heating requirements, providing flexible temperature control and adaptability to various usage patterns without requiring a completely complex multi-element system.
2Reliability
If continuous high-power heating is applied, then the heating speed and productivity are high, but thermal and electric fatigue increase reducing reliability
Solution Approach 1:
The heating element operates in periodic cycles rather than continuous operation. The controller alternates between active heating phases and rest phases, allowing the heating element to cool down periodically. This reduces cumulative thermal and electric fatigue, extending the heater's lifespan while still achieving the required heating productivity through optimized cycling patterns.
Solution Approach 2:
The system dynamically changes operating parameters such as power level, duty cycle, and heating duration based on real-time conditions. By adjusting these parameters, the system can operate at high productivity when needed while reducing stress on the heating element during normal operation, thereby balancing reliability and efficiency.
3Adaptability or versatility
If a single heating element is used, then the manufacturing cost and device complexity are low, but the system lacks redundancy and maintenance flexibility
Solution Approach 1:
The heating system is segmented into multiple independent heating elements or zones that can be manufactured and assembled separately. This modular approach provides redundancy and maintenance flexibility, as individual elements can be replaced or serviced without affecting the entire system, while still allowing for relatively simple manufacturing of each individual component.
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 allows for precise control of heat ratings, reducing energy density and fatigue, enabling flexible heating patterns and continued operation during maintenance by diverting energy to other elements.
Implementation Method 1
a first electric heating element secured to the base, and a second electric heating element secured to the base
Data Source
AI summary
A heating assembly for a water heater may include a base, a first electric heating element secured to the base, and a second electric heating element secured to the base. The second electric heating element is electrically isolated from the first electric heating element. The first and second electric heating elements are independently switchable to provide a first heat rating of the heating assembly and a second heat rating higher than the first heat rating. A water heater assembly may include a tank defining a chamber for holding a volume of water, and the heating assembly coupled to the tank. The water heater assembly may include a second heating assembly, and may further include a controller configured to control the first and second heating assemblies to provide heating at same or different heat ratings.