Water heater pilot operation
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Solution Overview
Problem
Atmospherically vented gas-fired water heaters require users to manually ignite and maintain a pilot flame, which can be cumbersome and requires checking for flame visibility, necessitating a solution for simplified ignition and continuous pilot flame management.
Innovation Solution
A controller system that receives user input to control a pilot gas valve and igniter to start and maintain a gas flow for the pilot burner, providing an ignition spark and notifications on flame status, allowing for remote operation and continuous pilot flame availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical piezo push button is used to generate spark for igniting pilot flame, then the ignition function is achieved, but the operation becomes cumbersome and complex for the user
Solution Approach 1:
The system automatically detects flame presence and maintains gas flow without user intervention. The controller monitors the flame sensor status and autonomously controls the gas valve to keep the pilot flame lit, eliminating the need for users to manually manage gas flow or check flame visibility.
Solution Approach 2:
The mechanical piezo push button system is replaced with an electronic control system that uses a flame sensor and electronic gas valve control. The system uses electrical signals and electronic detection rather than mechanical operations to achieve ignition and flame maintenance.
2Loss of information
If user manually checks pilot flame visibility by removing cover, then flame status can be confirmed, but the operation becomes complex and time-consuming
Solution Approach 1:
The flame sensor provides continuous feedback to the controller about flame presence. This automatic feedback mechanism eliminates the need for users to manually check flame status by removing covers, as the system continuously monitors and reports flame status through the user interface.
Solution Approach 2:
The flame sensor acts as an intermediary between the pilot flame and the user. Instead of users directly observing the flame, the sensor detects flame presence and communicates this information to the controller, which then displays status information to the user through the user interface.
3Duration of action of stationary object
If pilot gas valve is controlled to maintain continuous gas flow, then continuous pilot flame is achieved, but energy consumption increases
Solution Approach 1:
The system uses periodic ignition sparks rather than continuous ignition. The igniter generates sparks at specific intervals or only when flame extinction is detected, rather than continuously, reducing energy consumption while maintaining reliable pilot flame operation.
Solution Approach 2:
The system automatically detects flame extinction and reignites the pilot flame only when necessary. The controller monitors flame status continuously and activates the gas valve and igniter only when flame loss is detected, eliminating unnecessary gas consumption and energy waste from continuous operation.
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
Simplifies the ignition and maintenance of the pilot flame, reducing user effort and eliminating the need for manual checks, while ensuring a continuous pilot flame for efficient water heater operation.
Implementation Method 1
controlling, by the controller, an igniter to generate an ignition spark for lighting a pilot flame
Data Source
AI summary
A method of controlling water heater pilot flame ignition includes receiving, by a controller of a water heater, a user input and controlling a pilot gas valve to start a gas flow to a pilot burner in response to the user input. The method further includes, in response to the user input, controlling, by the controller, an igniter to generate an ignition spark for lighting a pilot flame. The method also includes controlling, by the controller, the pilot gas valve to maintain the gas flow to the pilot burner if the pilot flame is lit.