Storage Water Heater Relay Control for Staged Heating
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Solution Overview
Problem
Conventional electric water heaters lack efficient control mechanisms for managing multiple heating elements, leading to suboptimal energy usage and potential overheating, as they often operate all heating elements simultaneously or sequentially without adaptive temperature-based control.
Innovation Solution
A storage-type water heater with multiple heating banks and a controller that selectively operates contactors to supply power based on temperature thresholds, allowing for concurrent or sequential operation of heating elements and incorporating a temperature probe for adaptive control, enabling efficient heating management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If all heating elements are operated simultaneously, then heating speed is improved, but energy efficiency deteriorates and overheating risk increases
Solution Approach 1:
The heating elements are divided into multiple banks (first heating bank and second heating bank) that can be operated independently. The controller selectively activates specific banks based on temperature requirements, avoiding unnecessary operation of all heating elements and thereby improving energy efficiency while maintaining adequate heating speed.
Solution Approach 2:
The system dynamically adjusts which heating banks are active based on real-time temperature feedback from the temperature probe. The controller continuously monitors water temperature and selectively engages or disengages heating banks to match the actual heating需求, preventing both energy waste and overheating while maintaining optimal heating speed.
2Power
If all heating elements are operated simultaneously, then heating power is improved, but temperature control precision deteriorates
Solution Approach 1:
By segmenting the heating system into multiple independently controllable banks, the controller can apply different power levels to different zones. This allows for more granular temperature control, maintaining high overall power when needed while preventing localized overheating and improving temperature control precision.
Solution Approach 2:
Different heating banks can be activated based on local temperature conditions detected by the temperature probe. This allows the system to apply heating power selectively to areas that need it, rather than uniformly applying power throughout, thereby maintaining high heating power where needed while improving overall temperature control precision.
3Loss of energy
If sequential operation of heating banks is implemented, then energy efficiency is improved, but heating time increases
Solution Approach 1:
The controller is configured to activate the first heating bank initially, and upon detecting that its temperature threshold is reached, automatically activates the second heating bank. This preliminary action ensures that heating begins immediately with the first bank, and the second bank is engaged in advance to maintain high heating power, thereby reducing total heating time while still achieving energy efficiency through selective operation.
Solution Approach 2:
The system uses periodic temperature monitoring and staged activation of heating banks. Rather than continuous operation of all banks, the system periodically checks temperature and activates additional banks as needed, creating a rhythm of selective heating that improves energy efficiency while maintaining acceptable heating speeds through timely activation of subsequent banks.
4Measurement precision
If temperature-based selective control is implemented, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The system uses a temperature probe to continuously monitor water temperature and feeds this information back to the controller. The controller compares the measured temperature against predetermined thresholds and automatically adjusts which heating banks are active. This feedback mechanism achieves precise temperature control through a relatively simple on/off control logic, minimizing the increase in device complexity while maximizing temperature control precision.
Solution Approach 2:
The heating system is designed to automatically regulate itself based on temperature feedback without requiring complex external control systems. The controller autonomously decides which heating banks to activate or deactivate based on simple threshold comparisons, allowing the system to self-manage temperature control with minimal additional complexity beyond the basic temperature sensing and control circuitry.
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 allows for optimized energy usage by adjusting the operation of heating elements based on water temperature, preventing overheating and ensuring efficient heating cycles, thereby improving the overall performance and safety of the water heater.
Implementation Method 1
a first heating bank including a first heating surface disposed within the tank; a first contactor connected to the first heating bank... a second heating bank including a second heating surface disposed within the tank
Data Source
AI summary
A storage-type water heater including a tank for supporting water to be heated, a first heating element, a first relay connected to the first heating element, a second heating element, a second relay connected to the second heating element, and a controller for selectively operating the first relay and the second relay. The controller includes instructions for selecting a mode from at least, a no-sequencing mode, wherein the first relay and the second relay are operated concurrently, and a sequencing mode, wherein the first relay and the second relay are operated sequentially. The controller also operates the first relay to supply power to the first heating element, and operates the second relay to supply power to the second heating element, based on the selected mode.