Modular Tankless Water Heater Control for Stable Flow and Temperature
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Solution Overview
Problem
Existing tankless liquid heaters face inefficiencies in heating liquids, particularly in maintaining consistent temperature and flow, and are prone to interruptions if one heating element fails, leading to reduced performance and increased energy consumption.
Innovation Solution
A tankless liquid heater design featuring multiple parallel or series chambers with independently powered annular heating elements and a control system that includes temperature and flow sensors to manage heating element activation, ensuring continuous operation even if some elements fail, and optimizing energy use through controlled power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple heating elements are used in series or parallel, then heating reliability is improved, but device complexity increases
Solution Approach 1:
The heating system is divided into multiple independent heating elements (first heating element, second heating element, third heating element) that can be connected in series or parallel configurations. Each heating element operates independently with its own control circuitry, allowing the system to maintain heating functionality even if one element fails, thus improving reliability while managing complexity through modular design
Solution Approach 2:
The system changes the electrical connection parameters of heating elements based on operational requirements. The controller can switch between series and parallel configurations of the heating elements to optimize performance under different conditions, such as varying water flow rates or temperature requirements, thereby adapting the system's electrical parameters to maintain reliability
2Measurement precision
If heating power is increased to maintain temperature, then temperature control precision is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts the heating power by selectively activating different heating elements based on real-time temperature sensor feedback and water flow rate detection. The controller modulates which heating elements operate and at what power levels, creating a dynamic response that maintains precise temperature control while minimizing energy consumption by avoiding unnecessary heating
Solution Approach 2:
Temperature sensors continuously monitor the water temperature and provide feedback to the controller. The controller processes this feedback information and adjusts the heating element activation accordingly, creating a closed-loop control system that maintains precise temperature control while optimizing energy usage by activating heating elements only when and where needed
3Productivity
If flow rate is increased to improve productivity, then heating consistency deteriorates
Solution Approach 1:
The system performs preliminary detection of water flow rate before heating occurs. Based on the detected flow rate, the controller pre-adjusts which heating elements are activated and at what power levels. This preliminary action ensures that sufficient heating capacity is available to maintain consistent temperature even when high flow rates are detected, thereby maintaining heating consistency while supporting high productivity
Solution Approach 2:
The heating system dynamically responds to varying flow rates by adjusting the activation and power output of heating elements in real-time. When flow rate increases, the system activates additional heating elements or increases their power output to compensate for the reduced residence time of water in the heating chamber, thereby maintaining heating consistency across different productivity levels
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 provides efficient and consistent liquid heating with reduced energy consumption, maintaining performance even if some heating elements fail, and allows for precise temperature control, enhancing overall system reliability and efficiency.
Implementation Method 1
heat flows by conduction radially inwardly from the annular heating elements into the straight tubes, thereby heating the straight tubes
Implementation Method 2
A first temperature sensor and a first flow sensor are coupled to the first liquid heating assembly and a second temperature sensor and a second flow sensor are coupled to the second liquid heating assembly
Implementation Method 3
A first temperature sensor and a first flow sensor are coupled to the first liquid heating assembly and a second temperature sensor and a second flow sensor are coupled to the second liquid heating assembly
Data Source
AI summary
The invention includes a tankless liquid heater that employs a series of chambers, each having a plurality of heating tubes, with heating elements positioned thereon, and a control unit comprising a switch, controller, and power distributor to control the flow and heating of liquid in the system. In one embodiment, the control unit takes input from a liquid flow sensor that monitors the passage of liquid through the system, a temperature sensor adapted to monitor liquid temperature, and a current leakage sensor adapted to monitor the current leakage in the system. In response to these sensors, the control controller actuates the relay between an closed position, which allows current from the power distributor to pass to a plurality of heating elements, and an open position, which prevents the current from flowing from the power distributer to the plurality of heating elements.