Filter Containment Housing with Aerosol Injection and Sampling
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Solution Overview
Problem
Conventional leak testing systems for filters in ventilation systems require large test sections to ensure complete mixing of aerosols, leading to increased footprint, material costs, and energy consumption due to the need for larger fans to overcome airflow resistance caused by mixing elements.
Innovation Solution
The system incorporates a compact design with upstream and downstream test sections that utilize fixed arrays of aerosol dispersion and sampling apertures, along with a mixer in the downstream test section, to achieve homogeneous aerosol distribution and sampling across the cross-sectional area, allowing for a shorter system length and reduced hardware in the airflow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If large test sections are used to ensure complete mixing of aerosols, then mixing homogeneity is improved, but system footprint and material costs increase
Solution Approach 1:
The test section is divided into multiple segmented zones with individually controllable aerosol injection ports and sampling locations. This segmentation allows localized aerosol introduction and sampling at specific cross-sectional areas, eliminating the need for large uniform test sections while achieving complete mixing through distributed injection points throughout the duct length.
Solution Approach 2:
The patent transitions from relying solely on longitudinal duct length for mixing to utilizing the cross-sectional dimension by injecting aerosols at multiple locations across the duct cross-section. This multi-dimensional approach to aerosol distribution achieves homogeneous mixing in a compact volume by distributing injection and sampling points throughout the three-dimensional test section space.
2Stability of the object's composition
If large test sections with mixing elements are used, then aerosol mixing is improved, but airflow resistance increases leading to higher energy consumption
Solution Approach 1:
The patent extracts and eliminates traditional mechanical mixing elements (such as static mixers or moving parts) from the test section. Instead, mixing is achieved passively through the natural airflow patterns and strategic positioning of multiple small aerosol injection ports distributed along the duct, removing the energy-consuming mixing components entirely while maintaining homogeneous aerosol distribution.
Solution Approach 2:
The system utilizes the existing airflow through the filter as the mixing mechanism itself. The airflow naturally draws aerosols from multiple injection ports and distributes them throughout the test section without requiring additional energy input for mixing. The airflow serves both the primary function of filtering and the secondary function of aerosol mixing simultaneously.
3Stability of the object's composition
If multiple aerosol injection ports are used to achieve homogeneous distribution, then aerosol distribution uniformity is improved, but device complexity increases
Solution Approach 1:
The aerosol injection ports are designed with multi-functionality, serving both as aerosol introduction points and as flow distribution elements. The same structural components that define the test section geometry also serve as the aerosol injection infrastructure, eliminating the need for separate injection mechanisms and reducing overall device complexity despite having multiple injection points.
Solution Approach 2:
The injection ports utilize porous structures that allow aerosol to be introduced through multiple small openings in a controlled manner. This porous approach enables homogeneous aerosol distribution through passive diffusion and flow through the porous material, achieving uniform distribution without requiring complex active control systems or numerous individually controlled injection points.
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
This design results in a more energy-efficient, cost-effective containment system with accurate filter efficiency testing, reduced equipment costs, and a smaller footprint compared to conventional systems.
Implementation Method 1
The downstream test section can include a mixer arranged relative to an upstream aperture of the downstream test section
Implementation Method 2
The downstream test section can also include an array of sensing ports arranged in the downstream test section between the upstream aperture and the downstream aperture
Data Source
AI summary
The system and method for testing a filter containment system. A containment system may include a filter housing with a diverging transition section mounted upstream and a converging transition section mounted downstream. An upstream test section can be arranged upstream of the diverging transition section. During a test of the filter, and aerosol can be dispersed substantially evenly across a cross-sectional area of the upstream test section. The downstream test section can be arranged downstream of the converging transition section. The downstream test section may optionally include a mixer that disturbs the airflow. The downstream test section can also include a sampling array, downstream of the mixer that simultaneously samples the airflow substantially evenly across the cross-sectional area of the downstream test section for the presence of aerosol.