Bare Wire Water Heater Optical Overheat Detection
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Solution Overview
Problem
Bare wire heating systems are susceptible to damage from dry firing or prolonged operation without fluid flow, as they lack effective real-time overheating detection, especially with stagnant water or gas pockets, leading to delayed temperature transfer and increased risk of damage.
Innovation Solution
A heating unit with electrical resistance heating elements on a tube surface, featuring indexed grooves for retention clips and an optical sensor within a heating chamber to detect overheating by monitoring visible light emission, allowing for rapid detection and prevention of overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical thermostats are used to detect overheating, then the system can identify temperature issues, but the response time is delayed due to heat transfer limitations through materials and stagnant water
Solution Approach 1:
The patent replaces mechanical thermostats with optical sensors that detect visible light emission from overheating heating elements. This substitution eliminates the delay caused by heat transfer through materials and stagnant water, as optical detection occurs immediately when the element reaches critical temperature and emits visible light.
Solution Approach 2:
The patent utilizes the color change (visible light emission) of heating elements when they overheat as the detection mechanism. The optical sensor detects the visible glow emitted by the heating element when it reaches dangerous temperatures, providing immediate detection without relying on thermal conduction through intermediate materials.
2Productivity
If bare wire heating elements are used to heat fluid efficiently, then heating rate is extremely high, but the system is susceptible to damage from dry firing or low pressure operation
Solution Approach 1:
The patent implements an optical feedback system where sensors continuously monitor the heating elements for visible light emission indicating overheating. When overheating is detected, the system provides feedback to shut down the heating element, preventing damage from dry firing or low pressure operation while maintaining high heating rates during normal operation.
Solution Approach 2:
The patent takes preliminary action by detecting the onset of overheating through optical sensors before actual damage occurs. The system monitors for visible light emission as an early warning sign and shuts down the heating element proactively, preventing the progression to damaging temperatures.
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 immediate detection of overheating, preventing damage to the heating elements and extending the system's longevity by quickly shutting down the heating elements when overheating is detected, thus enhancing safety and reducing maintenance costs.
Implementation Method 1
electrical resistance heating element to heat fluids passing over the heating element
Implementation Method 2
The heating chamber includes an optical sensor to detect overheating of the at least one electrical resistance heating element
Data Source
AI summary
A heating unit for heating fluid is described having at least one electrical resistance heating element on an outer surface of a tube. At least one indexed groove is provided around a surface of the tube allowing for at least one retention clip to hold the electrical resistance heating element. A heating chamber is also provided to enclose a portion of the tube and to provide a flow channel therebetween. The heating chamber includes an optical sensor to detect overheating of the at least one electrical resistance heating element. Fluid is heated by flowing over the surface of the at least one electrical resistance heating element and through the tube.