Single-Stage Combination Paint Arrestance Filter

Solution Overview

Problem

HEPA filters in HVAC systems face challenges with high airflow restriction and increased pressure drop due to dense media, leading to higher energy consumption and costly infrastructure modifications to meet advanced filtration requirements, particularly in industries like aerospace where retrofitting existing systems is necessary.

Innovation Solution

A combination filter design incorporating a single-stage configuration with two layers of electrostatic media, where a 90% efficient first layer pre-filters the 99.97% efficient lofted electrostatic HEPA media, reducing pressure drop and enabling compliance with stringent filtration standards without requiring new fans or motors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If HEPA filters use dense media to achieve high filtration efficiency, then particle removal efficiency is improved, but airflow restriction and pressure drop increase

Engineering Contradiction:

Improvefiltration efficiencyVSAvoidpressure drop

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The filter is divided into multiple stages with different media densities. The first stage uses coarser media for pre-filtration, while the second stage uses finer HEPA media for high-efficiency particle removal. This segmentation allows each stage to operate at optimal density for its specific filtration function, reducing overall pressure drop while maintaining high efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the filter have different media densities tailored to their specific functions. The first stage uses lower density media suitable for capturing larger particles, while the second stage uses higher density HEPA media for capturing smaller particles. This local differentiation optimizes both filtration efficiency and airflow characteristics.

Inventive Principle:

Principle #3Local quality

2Reliability

If HEPA filters use dense media to achieve high filtration efficiency, then particle removal efficiency is improved, but airflow restriction increases

Engineering Contradiction:

Improvefiltration efficiencyVSAvoidairflow

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The filter is divided into multiple stages with different media densities. The first stage uses coarser media for pre-filtration, while the second stage uses finer HEPA media for high-efficiency particle removal. This segmentation allows each stage to operate at optimal density for its specific filtration function, reducing overall pressure drop while maintaining high efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the filter have different media densities tailored to their specific functions. The first stage uses lower density media suitable for capturing larger particles, while the second stage uses higher density HEPA media for capturing smaller particles. This local differentiation optimizes both filtration efficiency and airflow characteristics.

Inventive Principle:

Principle #3Local quality

3Reliability

If standard HEPA filters are used to meet advanced filtration requirements, then filtration compliance is improved, but infrastructure modification costs increase

Engineering Contradiction:

Improvefiltration complianceVSAvoidinfrastructure modification cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention combines multiple filtration stages into a single integrated filter unit that can be installed in existing HVAC systems without requiring separate filter housings or complex infrastructure modifications. The merged design includes a first stage for pre-filtration and a second stage for HEPA-level filtration, achieving compliance while minimizing infrastructure changes.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The filter is designed as a universal replacement that can be installed in existing HVAC systems without requiring new fans, motors, or specialized infrastructure. The multi-functional design integrates pre-filtration and HEPA filtration in a single unit that adapts to existing system constraints, reducing modification costs while meeting advanced filtration requirements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 combination filter achieves efficient particle removal with a lower pressure drop than standard HEPA filters, allowing retrofitting into existing systems and meeting advanced filtration requirements, such as those in the aerospace industry, while reducing energy consumption and costs.

Implementation Method 1

two layers of electrostatic media, where a 90% efficient first layer pre-filters the 99.97% efficient lofted electrostatic HEPA media

Methodology Applied

Scientific EffectElectrostatic attraction: Electrostatics

Data Source

PatentUS9873076B2High efficiency paint arrestance filter

Publication Date: 2018.01.23 A J DRALLE

AI summary

Various examples of the inventive subject matter include a method and corresponding system for fabricating a combination paint arrestance filter for use in the painting industry. Embodiments of the system include a single-stage combination filter having a number of first layer media pockets and a number of second layer media pockets arranged downstream of the first layer pockets. An opening of each of the first layer media pockets is arranged in parallel with one another to receive an incoming airflow into the single-stage combination filter. Each of the second layer media pockets is at least 99.97% efficient at removing 0.3 micron and larger particles at a face velocity on the filter of about 37 meters per minute.