Multi-Level Fine Filter Assembly for HVAC Air Intake Debris Control
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Solution Overview
Problem
HVAC systems face reduced airflow and efficiency due to debris accumulation on microchannel heat exchangers, which existing filters exacerbate by creating pressure drops when attempting to filter outdoor debris.
Innovation Solution
A filter assembly with a coarse outer mesh, a coarse inner mesh, and a fine filter with multiple levels and movable filter sections that adjust to minimize pressure drop and effectively capture both coarse and fine debris, including features like triangular valleys and extensions to accumulate debris while maintaining airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional single-layer filter is used to capture debris, then debris protection is improved, but pressure drop increases and airflow is reduced
Solution Approach 1:
The filter assembly is divided into multiple functional layers: a coarse filter layer for capturing large debris particles, and a fine filter layer with triangular valleys for capturing fine debris. This segmentation allows each layer to handle specific particle sizes, improving overall filtration efficiency while maintaining airflow by preventing the fine filter from becoming clogged with coarse particles.
Solution Approach 2:
The fine filter incorporates triangular valleys that extend in the direction of airflow, creating a three-dimensional structure. This dimensional addition provides depth for debris accumulation within the filter plane, increasing the effective filtration area and allowing the filter to capture fine debris without significantly increasing pressure drop, as debris accumulates in the valleys rather than blocking the entire filter surface.
2Measurement precision
If a fine filter is used to capture fine debris, then filtration precision is improved, but pressure drop increases
Solution Approach 1:
The filter assembly separates fine debris capture (fine filter with triangular valleys) from coarse debris capture (coarse filter), allowing the fine filter to focus only on fine particles. This segmentation prevents coarse debris from clogging the fine filter pores, maintaining filtration precision while minimizing pressure drop increase.
Solution Approach 2:
The triangular valleys add a depth dimension to the fine filter, creating channels that guide airflow while providing spaces for fine debris accumulation. This three-dimensional structure increases the effective filtration capacity without proportionally increasing pressure drop, as the valleys distribute the debris load throughout the filter depth rather than concentrating it at the surface.
3Adaptability or versatility
If filter sections are made movable to adjust filtration levels, then adaptability is improved, but device complexity increases
Solution Approach 1:
The filter assembly incorporates movable filter sections that can be adjusted between different positions to change the filtration level. This dynamic configuration allows the system to adapt to varying environmental conditions (e.g., high pollen seasons vs. clear conditions) by adjusting the openness of the filter, providing versatility while keeping the adjustment mechanism relatively simple through the use of movable rather than fully reconfigurable components.
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 filter assembly improves HVAC system efficiency by reducing pressure drop and preventing debris from reaching heat exchangers, enhancing airflow and operational efficiency while adjusting filtration levels based on environmental conditions.
Implementation Method 1
a fine filter disposed between the first layer and the second layer, wherein the fine filter includes an upper level and a lower level with respect to the airflow, and wherein the lower level facilitates accumulation of fine debris captured from the airflow
Data Source
AI summary
The present disclosure relates generally to air intake filter assemblies, and more particularly to air intake assemblies for an outdoor portion of a heating, ventilation, and/or air conditioning (HVAC) system. In an embodiment, a filter assembly is configured to filter an airflow entering an air intake of a HVAC unit. The filter assembly includes a first layer of a first coarse mesh, a second layer of a second coarse mesh, and a fine filter disposed between the first layer and the second layer. Additionally, the fine filter includes an upper level and a lower level with respect to the airflow, and wherein the lower level facilitates accumulation of fine debris captured from the airflow entering the air intake of the HVAC unit.