Furnace cabinet with three baffles
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Solution Overview
Problem
HVAC systems face a trade-off between reducing primary tube temperatures, increasing air velocities, and increasing pressure drop, leading to higher power consumption and decreased furnace fan efficiency due to suboptimal airflow paths and recirculation patterns in furnaces without effective baffle configurations.
Innovation Solution
A furnace design incorporating three baffles strategically placed within the cabinet to direct airflow efficiently towards the primary heat exchanger, enhancing airflow contact and reducing recirculation, thereby increasing airflow velocities while minimizing pressure drop and improving heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If baffles are placed in a heat exchanger compartment to reduce primary tube temperatures, then tube life expectancy increases, but air velocity increases and pressure drop increases leading to higher power consumption
Solution Approach 1:
The patent applies local quality by positioning baffles at specific locations within the heat exchanger compartment rather than uniformly throughout. The first baffle is positioned to redirect airflow over the heat exchanger tubes, while the second and third baffles are strategically placed to manage recirculation zones. This localized approach optimizes tube temperature reduction precisely where needed without excessively increasing overall air velocity and pressure drop throughout the entire system.
2Productivity
If air velocity is increased to improve heat exchange, then heat transfer efficiency increases, but pressure drop increases leading to decreased fan efficiency
Solution Approach 1:
The patent segments the airflow path into distinct zones using multiple baffles. The first baffle redirects airflow over the heat exchanger tubes to enhance heat transfer in the primary zone. The second and third baffles create controlled recirculation zones that allow air to pass over the heat exchanger multiple times, improving heat exchange efficiency without requiring continuously high air velocities. This segmentation enables efficient heat transfer at moderate fan power consumption.
3Loss of energy
If recirculation is reduced to improve airflow efficiency, then pressure drop decreases, but heat exchange contact time may be reduced
Solution Approach 1:
The patent implements periodic action through controlled recirculation zones created by the second and third baffles. Airflow is redirected to pass over the heat exchanger tubes in a cyclical manner, creating multiple contact opportunities. This periodic recirculation allows air to repeatedly interact with the heat exchange surfaces, maintaining efficient heat transfer while the overall system pressure drop is managed through optimized baffle positioning and airflow path design.
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 three-baffle configuration optimizes airflow, reducing primary heat exchanger temperatures, increasing heat exchange efficiency, and maintaining fan efficiency by minimizing recirculation and pressure drop, thus enhancing overall furnace performance.
Implementation Method 1
exchanging heat between the circulation airflow and the primary heat exchanger
Data Source
AI summary
A condensing gas-fired furnace has a furnace cabinet, a primary heat exchanger, a secondary heat exchanger located upstream relative to the primary heat exchanger with regard to location within a circulation airflow path, a first baffle carried by a first wall of the furnace cabinet, a second baffle carried by a second wall of the furnace cabinet, wherein the second baffle is located opposite the first baffle, and wherein the second wall is located opposite the first wall, and a third baffle carried by a third wall of the furnace cabinet, wherein the third baffle is located adjacent to the first baffle and the second baffle, and wherein the third wall is located adjacent to the first wall and the second wall.