Furnace
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Solution Overview
Problem
Conventional furnaces face inefficiencies in burning fuel and transferring heat, along with high emissions of undesirable combustion by-products, and require frequent maintenance and electronic control updates, which can be unreliable during power outages.
Innovation Solution
A forced-air furnace design with a combustion air delivery system that includes primary and secondary combustion air passages, a valve system to adjust secondary air delivery based on combustion chamber temperature, and a heat transfer device to ensure a complete and efficient burn, reducing emissions and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional furnaces use electronic controls to manage combustion, then operational precision is improved, but reliability deteriorates during power outages and maintenance requirements increase
Solution Approach 1:
The valve system automatically adjusts secondary combustion air delivery based on combustion chamber temperature without requiring external power or electronic controls. The system serves itself by using the combustion process heat to drive the temperature-responsive valve, eliminating dependency on electronic systems while maintaining reliable operation.
Solution Approach 2:
The valve system changes its operation based on temperature parameters. As combustion chamber temperature increases, the valve automatically adjusts to deliver appropriate amounts of secondary combustion air, providing precision control through physical parameter response rather than electronic control.
2Object-generated harmful factors
If furnaces use catalytic emissions reduction systems to lower emissions, then harmful factors are reduced, but device complexity increases and maintenance requirements increase
Solution Approach 1:
The patent removes the catalytic converter component from the emissions reduction system. Instead of using a catalytic system that requires maintenance and adds complexity, the invention extracts the emissions control function and achieves it through improved combustion air delivery and complete combustion in the firebox.
Solution Approach 2:
The invention converts the potential harm of incomplete combustion into benefit by ensuring complete combustion through proper air delivery. The secondary combustion air passage and temperature-responsive valve work together to ensure all combustible materials are fully burned, turning the combustion process itself into the solution rather than requiring additional emissions treatment equipment.
3Productivity
If furnaces increase combustion air delivery to improve combustion efficiency, then productivity is improved, but harmful factors increase due to incomplete combustion at low temperatures
Solution Approach 1:
The temperature-responsive valve creates a feedback loop where combustion chamber temperature directly controls secondary air delivery. As temperature rises from efficient combustion, the valve responds by adjusting air delivery to maintain optimal combustion conditions, preventing incomplete combustion and harmful by-products while sustaining high productivity.
Solution Approach 2:
The system dynamically adjusts secondary combustion air delivery based on real-time combustion chamber temperature conditions. The valve automatically modulates air flow to match combustion needs, ensuring complete combustion and high efficiency without producing harmful by-products, adapting to changing combustion conditions without external control.
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 furnace achieves a high efficiency and complete burn of fuel, reducing harmful emissions and eliminating the need for electronic controls, ensuring reliable operation and reduced maintenance, even during power outages.
Implementation Method 1
A firebox in the housing has a combustion chamber adapted for receiving fuel to be combusted for producing products of combustion
Implementation Method 2
The heat transfer device includes heat transfer passaging downstream from the blower for receiving air from the blower to be heated by the post-combustion plenum
Implementation Method 3
A forced-air system includes a blower configured for moving air to the heat transfer device
Data Source
AI summary
A furnace including a combustion chamber for burning fuel can have increased fuel burning efficiency, increased heating efficiency, and decreased harmful emissions of combustion byproducts. A combustion air delivery system delivers primary and secondary combustion air to the combustion chamber. Primary and secondary combustion air may be delivered at amounts that increase burning efficiency. An amount of secondary combustion air can be controlled by a valve system. A heat transfer device efficiently transfers heat from products of combustion for heating an enclosed space.