Electric Water Heater Sensor Separation to Reduce Temperature Stacking
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Solution Overview
Problem
Conventional water heater appliances experience temperature stacking and overheating due to the close proximity of heating elements and temperature sensors, leading to unreliable performance and reduced lifespan.
Innovation Solution
The design includes a tank with electric heating elements and temperature sensors positioned to create a sensor gap, ensuring even heat distribution and preventing overheating, with the lower sensor gap being greater than the upper sensor gap to maintain optimal temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the temperature sensor is positioned close to the heating element (1-3 inches above), then installation is simplified and components are easier to mount, but temperature stacking and overheating occur leading to unreliable temperature control
Solution Approach 1:
The patent introduces an intermediary space (sensor gap) between the heating element and temperature sensor, filled with water that acts as a thermal mediator. This water column transmits thermal information from the heating element region to the sensor without allowing direct thermal contact, preventing overheating while maintaining functional connection.
Solution Approach 2:
The patent transitions from horizontal/vertical mounting configurations to a radial mounting configuration where the temperature sensor is positioned on the lateral wall of the tank above the heating element. This dimensional change creates natural thermal separation while maintaining effective temperature monitoring through the water medium.
2Productivity
If the heating element operates at high power to quickly heat water, then heating efficiency is improved, but temperature variations and overheating occur causing water temperature to exceed the set threshold
Solution Approach 1:
The patent implements a feedback mechanism where the temperature sensor continuously monitors water temperature and signals the controller to adjust heating element operation. The separated sensor position provides more accurate feedback about overall water temperature rather than localized temperature near the heating element, enabling better control of high-power heating operations.
Solution Approach 2:
The patent creates a thermal cushioning effect by positioning the sensor away from the heating element, allowing the water column between them to absorb and distribute thermal energy. This prevents sudden temperature spikes at the sensor location and provides a buffer that smooths temperature variations during high-power heating cycles.
3Speed
If the temperature sensor is positioned close to the heating element, then the sensor can detect temperature changes quickly, but temperature stacking occurs causing significant temperature variations within the tank
Solution Approach 1:
The patent changes the spatial parameter (distance) between the temperature sensor and heating element from close proximity (1-3 inches) to a greater separation distance. This parameter change allows the sensor to detect temperature changes at a rate appropriate for overall tank temperature monitoring while preventing the temperature stacking that occurs with close proximity mounting.
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 ensures consistent hot water temperatures, reduces cycling of the heating elements, and extends their lifespan by preventing temperature variations and overheating.
Implementation Method 1
Heating elements heat water within the tank during operation of such water heater appliances. In particular, the heating elements generally heat water within the tank to a predetermined temperature.
Implementation Method 2
The electromechanical temperature sensor is generally positioned 1 to 3 inches above the heating element and activates or deactivates the heating element according to a predetermined temperature threshold.
Data Source
AI summary
An electric water heater appliance is provided herein. The electric water heater appliance may include a tank, an electric heating element, and a temperature sensor. The tank may define an interior volume extending from a top portion to a bottom portion. The interior volume may define a volume height along a vertical direction between the bottom portion and the top portion. The electric heating element may be operable to heat water within the interior volume. The temperature sensor may be attached to the tank above the electric heating element. A sensor gap may be defined along the vertical direction between the electric heating element and the temperature sensor.