Water Heater Set-Point Control for High-Usage Hot Water Events
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Solution Overview
Problem
Storage-type water heaters consume excess energy by maintaining high temperatures for extended periods, leading to unnecessary heating beyond user requirements, despite efforts to reduce energy usage through insulation and usage pattern monitoring.
Innovation Solution
A fluid-heating apparatus with a control circuit that monitors temperature sensors to detect high-quantity usage events, adjusting the temperature set point based on sensed temperatures and rates of change, ensuring adequate hot water is available while minimizing excess heating by reducing the set point after usage events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature set point is maintained high for extended periods, then sufficient hot water is available for high-quantity usage events, but energy consumption increases due to unnecessary heating beyond user requirements
Solution Approach 1:
The temperature set point is made dynamic rather than static. The control circuit automatically adjusts the set point based on detected usage patterns - maintaining high temperatures during/after high-quantity usage events and reducing them during low-usage periods. This dynamic adjustment resolves the contradiction by ensuring hot water availability when needed while minimizing energy consumption during low-demand periods.
Solution Approach 2:
The system implements feedback control by continuously monitoring temperature sensor data and usage patterns. The control circuit detects high-quantity usage events through temperature changes and uses this feedback to automatically adjust the temperature set point. This closed-loop feedback mechanism ensures the system responds to actual user needs rather than maintaining fixed high temperatures, thereby reducing unnecessary energy consumption while maintaining reliability.
2Use of energy by moving object
If the temperature set point is reduced to minimize excess heating, then energy consumption decreases, but hot water availability may be insufficient for high-quantity usage events
Solution Approach 1:
The system performs preliminary action by detecting high-quantity usage events through temperature sensor monitoring and proactively adjusting the temperature set point in anticipation of hot water needs. When a usage event is detected (indicated by rapid temperature change), the system raises the set point before the user would otherwise need hot water, ensuring availability while avoiding premature heating during low-demand periods.
Solution Approach 2:
The temperature set point transitions from a static low value to a dynamic value that adapts to usage conditions. The control circuit modifies the set point based on real-time detection of usage events, creating a dynamic system that balances energy efficiency with hot water availability. This dynamic behavior resolves the contradiction by adjusting temperatures only when and where needed.
3Use of energy by moving object
If insulation is added to reduce radiant heat loss, then energy consumption decreases, but the system cannot adapt to varying user hot water需求的
Solution Approach 1:
The system implements feedback control that monitors temperature sensor data to detect usage patterns. This feedback mechanism enables the control circuit to distinguish between high-quantity and low-quantity usage events, allowing the system to adapt its heating behavior accordingly. The feedback loop provides the adaptability that static insulation alone cannot achieve.
Solution Approach 2:
The system performs self-service by automatically detecting usage events through temperature monitoring and autonomously adjusting the temperature set point without user intervention. The control circuit identifies high-quantity usage events and independently modifies heating parameters, enabling the system to adapt to varying demands while maintaining energy efficiency. This self-adjusting capability complements the passive insulation.
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 effectively reduces energy consumption by adjusting the temperature set point according to usage patterns, ensuring sufficient hot water is available for high-quantity events without excess heating, thereby optimizing energy usage in storage-type water heaters.
Implementation Method 1
a temperature sensor, and a control circuit. The control circuit is configured to monitor the temperature sensor
Implementation Method 2
activate the heating device when a temperature sensed is less than a set point
Data Source
AI summary
Systems and methods of heating an accurate quantity of a fluid. A determination is made that an event in which a relatively large quantity of hot water is used has occurred. One or more temperatures are sensed. An increase in a temperature set point is made if the sensed temperatures indicate a shortage of hot water for the event. A decrease in the temperature set point is made if the sensed temperatures indicate an excess of hot water was available for the event. No change is made to the temperature set point if the quantity of hot water available for the event was appropriate.