Water Heater Controller Thermal Segmentation

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Solution Overview

Problem

Electronically actuated water heater controllers face heat-related reliability issues due to high water temperatures and heat generation from electronics, which can affect temperature sensor accuracy and increase controller size, making it difficult to maintain a compact design similar to mechanically actuated controllers.

Innovation Solution

The design incorporates a mechanically actuated emergency shut-off apparatus to manage high temperatures, separates heat-generating components from temperature sensors, and uses thermally conductive elements for heat sinking, while maintaining a compact size by positioning temperature sensors away from heat sources and using a metallic alloy for current-carrying components to reduce contact resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If electronically actuated controllers are used to enable complex control algorithms and automated set point adjustment, then system efficiency and adaptability are improved, but heat generation from electronics affects temperature sensor accuracy and component reliability

Engineering Contradiction:

Improvecontrol algorithm flexibilityVSAvoidtemperature sensor accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The controller is divided into distinct thermal zones: a first region housing temperature-sensitive components (temperature sensor, microprocessor) and a second region housing heat-generating components (relay, heater control circuit). This spatial segmentation isolates the temperature sensor from heat sources, preventing thermal interference and maintaining measurement accuracy while enabling complex electronic control algorithms.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If the controller size is increased to accommodate heat dissipation requirements and component separation, then temperature sensor accuracy is improved, but the controller becomes larger and more expensive

Engineering Contradiction:

Improvetemperature reading accuracyVSAvoidcontroller size

Core Design Contradiction:

Measurement precisionVSVolume of stationary object

Solution Approach 1:

The controller housing is designed with differentiated thermal zones: the first region is thermally isolated to protect temperature-sensitive components, while the second region allows heat-generating components to operate at higher temperatures. This localized thermal management approach maintains compact overall size while providing targeted thermal protection where needed.

Inventive Principle:

Principle #3Local quality

3Volume of stationary object

If temperature sensors are placed in close proximity to heat-generating electronics for compact design, then controller size is reduced, but heat from electronics affects sensor readings

Engineering Contradiction:

Improvecontroller sizeVSAvoidtemperature measurement accuracy

Core Design Contradiction:

Volume of stationary objectVSMeasurement precision

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

4Productivity

If high water temperatures are used to ensure adequate heating performance, then heating efficiency is improved, but heat-related reliability issues increase and controller size must be increased

Engineering Contradiction:

Improveheating performanceVSAvoidcontroller reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The controller is divided into distinct thermal zones: a first region housing temperature-sensitive components (temperature sensor, microprocessor) and a second region housing heat-generating components (relay, heater control circuit). This spatial segmentation isolates sensitive components from high-temperature environments and heat sources, enabling the system to operate at high water temperatures for optimal heating performance while maintaining component reliability.

Inventive Principle:

Principle #1Segmentation

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 enhances the reliability and efficiency of electronically actuated water heater controllers by minimizing heat-related issues, maintaining a compact size, and ensuring accurate temperature readings, thus addressing the challenges faced by conventional electronically actuated systems.

Implementation Method 1

a temperature sensor, such as a thermistor, is used to measure water temperature and provide data indicative of the measured temperature

Methodology Applied

Scientific EffectTemperature sensing: Thermistor

Implementation Method 2

electrical current to flow to a heating element within the tank. Thus, the heating element begins to heat the water in the tank

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 3

uses thermally conductive elements for heat sinking

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS8245669B2Water heating systems and methods

Publication Date: 2012.08.21 A O SMITH

AI summary

A water heating system, comprise a tank, a heating element, and a controller that is coupled to the heating element. The controller comprises a base, a housing, a relay, logic and, a temperature sensor. The base is composed of thermally conductive material, and the housing is composed of electrically insulating material. The housing is coupled to the base, and the logic is configured to control the a state of the relay. Further, the temperature sensor contacts the base and is coupled to the logic.