Throttled Vent Termination for Combustion Efficiency
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Solution Overview
Problem
Direct vent gas stoves and fireplaces face reduced combustion efficiency due to backpressure in the venting system, which can lead to flame extinguishing, especially in poorly designed systems and windy conditions.
Innovation Solution
A throttled vent termination system with a cylindrical inner pipe and concentric outer housing, featuring a throttle cover that regulates airflow into the vent system, allowing for adjustable settings to manage combustion air intake and reduce backpressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct vent system uses a fixed vent cap design, then the structure is simple and easy to manufacture, but combustion efficiency decreases due to backpressure and wind conditions
Solution Approach 1:
The vent cap incorporates a movable throttle cover that can be adjusted to different positions to dynamically control the intake region area. This allows the system to adapt to varying wind conditions and backpressure scenarios, optimizing combustion efficiency without requiring a completely complex redesign of the entire vent system.
Solution Approach 2:
The patent changes the parameter of the intake region area by providing multiple fixed position openings in the throttle guide. By selecting different opening configurations, the effective intake area is modified to compensate for backpressure effects, thereby improving combustion reliability under different operating conditions.
2Reliability
If the intake region area is reduced to compensate for backpressure, then combustion efficiency improves, but the system loses adaptability to varying wind conditions
Solution Approach 1:
The throttle cover is designed to be movable along the vent pipe, allowing users to adjust the intake region area dynamically. This dynamic adjustment capability enables the system to adapt to different wind conditions and backpressure scenarios, maintaining both combustion efficiency and environmental adaptability.
Solution Approach 2:
The throttle guide is provided with multiple discrete opening positions that segment the adjustment range into specific steps. This segmentation allows for precise control of the intake area while maintaining ease of adjustment, balancing combustion efficiency with adaptability to varying conditions.
3Reliability
If a throttle mechanism is added to regulate airflow, then combustion efficiency and adaptability improve, but the device complexity and difficulty of installation increase
Solution Approach 1:
The throttle cover is designed as a simple movable component that can be adjusted after installation if needed. This dynamic feature is implemented in a way that maintains ease of operation, allowing users to modify the intake region area without requiring complex tools or procedures, thus balancing improved combustion efficiency with installation simplicity.
4Adaptability or versatility
If the vent cap is designed with fixed geometry, then manufacturing is simple, but the system cannot accommodate varying wind conditions
Solution Approach 1:
The throttle guide is designed with multiple pre-defined opening positions that provide discrete adjustment options. This segmentation approach allows for adaptability to different wind conditions while keeping the manufacturing process relatively simple, as the openings can be created using standard manufacturing techniques rather than requiring complex adjustable mechanisms.
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 throttled vent termination system enhances combustion efficiency by independently regulating air flow, preventing flame extinguishing and accommodating varying wind conditions, thereby improving the performance of direct vent appliances.
Implementation Method 1
A throttle cover which is configured to be movably positioned and thereafter secured at one of a number of positions over the intake region using a throttle guide is provided to thereby regulate air flow into the void
Implementation Method 2
The outer pipe conveys outside air to the combustion chamber. After combustion, the exhaust is conveyed to the outside via the inner pipe
Data Source
AI summary
A throttled vent termination or cap for use in conjunction with a direct vent appliance and venting system is provided. The direct vent termination includes an inner pipe and a concentric outer housing surrounding the inner pipe to form a void between the inner pipe and the outer housing. The void adapted to provide intake air to the air intake section of the vent system. An end cap is provided at a first end of the outer pipe, the inner pipe to the end cap and having an exhaust opening therein. An intake region is formed in the outer housing providing access to the void. A throttle cover which is configured to be movably positioned and thereafter secured at one of a number of positions over the intake region using a throttle guide is provided to thereby regulate air flow into the void.