Multi-Sensor Water Heater Control for Temperature Stratification
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Solution Overview
Problem
Conventional water heaters suffer from temperature stratification, leading to energy inefficiency due to the inability to accurately control water temperature throughout the tank, resulting in hot and cold spots and unnecessary cycling of the heating element.
Innovation Solution
A water heater system equipped with first and second sensors to detect water temperature at different areas within the tank, providing signals to a controller that regulates the heating element based on predetermined state conditions to maintain optimal temperature, thereby preventing unnecessary heating cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single thermostat at the bottom of the tank is used to control heating, then the water temperature at the bottom can be maintained, but temperature stratification occurs causing hot and cold spots throughout the tank
Solution Approach 1:
The patent divides the temperature monitoring function into multiple segments by placing thermostats at different locations within the water tank (top, middle, bottom). Each thermostat independently monitors temperature in its specific zone, allowing the control system to address temperature variations throughout the entire tank rather than relying on a single bottom-mounted thermostat, thereby eliminating temperature stratification and hot/cold spots.
Solution Approach 2:
The patent transitions from single-point temperature monitoring (bottom only) to multi-dimensional temperature monitoring by distributing thermostats vertically throughout the tank at different heights. This spatial distribution across multiple dimensions enables comprehensive temperature control and eliminates the temperature gradients that occur with single-point monitoring.
2Temperature
If the heater cycles on and off frequently to maintain temperature, then the water temperature can be kept within threshold ranges, but energy is wasted due to unnecessary heating cycles
Solution Approach 1:
The control system performs preliminary assessment by checking the temperatures at all locations before initiating a heating cycle. If any location already meets or exceeds the minimum temperature threshold, the system prevents unnecessary heating cycles from starting, thereby avoiding wasted energy while still maintaining adequate temperature throughout the tank.
Solution Approach 2:
The patent implements a feedback control mechanism where thermostats continuously monitor temperature at multiple locations and provide real-time information to the control system. The heater is activated only when feedback from all thermostat locations indicates that temperature thresholds are not met, enabling energy-efficient operation by avoiding unnecessary heating cycles.
3Power
If the heater is located at the bottom of the tank to utilize the heat-rises principle, then heating efficiency is improved, but temperature stratification occurs causing the top water to be hotter than bottom water
Solution Approach 1:
The patent segments the temperature monitoring function across multiple vertical zones by placing thermostats at the top, middle, and bottom of the tank. This segmentation allows the control system to detect and respond to temperature stratification caused by bottom-mounted heating, activating upper thermostats when needed to compensate for the natural heat-rises effect and maintain uniform temperature distribution.
Solution Approach 2:
The patent applies local quality control by allowing different parts of the tank to be monitored and controlled independently. Each thermostat at a specific location (top, middle, bottom) manages the temperature conditions in its local zone, enabling the system to maintain appropriate temperature at each level while accommodating the bottom-heating configuration and its natural convection effects.
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 system ensures consistent water temperature delivery, reducing energy consumption by preventing heating when the top water temperature is within an acceptable range and optimizing heat cycles based on actual tank temperatures, thus enhancing energy efficiency.
Implementation Method 1
first and second sensors to detect water temperature at different areas within the tank
Implementation Method 2
a heater for heating the water
Implementation Method 3
water heaters heat cold or ambient temperature water entering at or near the bottom of the water heater to a desired temperature... During a heating cycle, the cold or ambient temperature water at the bottom of the water heater becomes hotter and begins to rise towards the top of the water heater. Denser water, once on top of the water being heated, falls toward the bottom
Data Source
AI summary
An improved heater and method of controlling the same is provided. The water heater has the combination of a tank for holding water, a heater for heating the water, a controller having logic to regulate the heater, and first and second sensors. Each of the sensors detects the water temperature at different areas within the water heater. The sensors also provide the controller with signals corresponding to the detected water temperature. In response to these signals, the controller regulates the heater when at least one of the signals of the first and second sensors satisfies at least one predetermined state condition.