Modulating Burner Valve Control for Precise Furnace Heating
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Solution Overview
Problem
Residential and commercial gas furnace systems face inefficiencies due to on/off control systems that result in temperature overshoot and steady-state errors, making it difficult to maintain precise temperature settings, leading to excessive energy usage or uncomfortable environments.
Innovation Solution
A system comprising a user interface, operating parameter sensor, controller, combination control valve, and variable flow valves that allow for precise control of gas flow to individual burners, enabling the system to adjust gas flow based on temperature differences between set and measured temperatures, thereby modulating heat output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If on/off control system is used with combination control valve, then device complexity is reduced, but temperature control precision deteriorates causing temperature overshoot and steady-state errors
Solution Approach 1:
The patent divides the single combination control valve into multiple independent control valves, each controlling a separate burner. This segmentation allows individual burners to be controlled independently, enabling precise temperature control without the overshoot problems of on/off systems. Each valve can be modulated to provide fine-grained control of heat output.
Solution Approach 2:
The patent transitions from static on/off control to dynamic modulating control where each control valve can vary its opening position continuously. This dynamic capability allows the system to adjust gas flow proportionally to temperature demand, maintaining precise temperature control while avoiding the abrupt transitions that cause temperature overshoot.
2Ease of operation
If on/off control system is used, then ease of operation is improved, but energy efficiency deteriorates due to excessive energy usage to maintain set temperature
Solution Approach 1:
The patent implements continuous modulating control where the control valves maintain a steady-state opening position that precisely matches the heating demand. This continuous adjustment eliminates the cyclical on/off operation that wastes energy, allowing the system to maintain the set temperature with minimal energy consumption by continuously adapting the gas flow to actual needs.
3Device complexity
If on/off control system is used, then device complexity is reduced, but temperature control resolution deteriorates making fine resolution control difficult
Solution Approach 1:
By segmenting the control system into multiple independently controlled burners with individual modulating valves, the patent achieves fine resolution temperature control. Each valve can be positioned at precise opening angles to deliver exact gas flow rates, enabling the system to make small, incremental temperature adjustments rather than large on/off steps.
Solution Approach 2:
The patent utilizes continuous variation of the control valve opening parameter to achieve fine resolution control. Each modulating valve can change its opening position across a continuous range, allowing precise control of gas flow rate and consequently precise control of heat output and temperature, far exceeding the binary on/off control resolution.
4Manufacturing precision
If control system is adjusted to reduce temperature overshoot, then temperature control precision is improved, but productivity deteriorates as burners remain off for too long
Solution Approach 1:
The patent applies partial action by using multiple burners that can be activated in different combinations and at different power levels. Instead of waiting for temperature to drop significantly before activating all burners, the system can activate individual burners or groups of burners at partial capacity to gradually raise temperature, eliminating unnecessary waiting time while maintaining precision.
Solution Approach 2:
The dynamic modulating capability allows the system to respond immediately to temperature demands by adjusting valve positions and activating specific burners proportionally. This eliminates the delayed response of on/off systems where burners must wait until temperature drops below a threshold, thereby improving heating productivity while maintaining temperature precision through continuous adjustment.
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
This solution allows for fine-resolution temperature control, reducing energy wastage and maintaining comfortable environments by efficiently adjusting heat output in response to temperature changes.
Implementation Method 1
The burners provide combustion of the gas from the variable flow valves, which in turn provides heat.
Data Source
AI summary
A variable output heating control system includes a user interface, an operating parameter sensor, a controller, a combination control valve, a plurality of variable flow valves, and a plurality of burners. The user interface allows a user to enter operating parameters, such as a set temperature. The operating parameters sensor provides measured parameters, such as a measured temperature. The controller receives the set temperature and the measured temperature and generates commands to control the flow of gas, based on the set temperature and the measured temperature. The combination control valve shuts off the flow of gas from an external gas source based on a command from the controller. The plurality of variable flow valves vary the flow of gas that is received from the combination control valve and supplied to the burners. The plurality of burners provide heat based on the combustion of gas that is received from the plurality of variable flow valves.