High efficiency particulate air filter test system and method
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Solution Overview
Problem
Current HEPA filter testing methods are inaccurate due to the lack of a closed-loop system and inability to verify the dispersion of testing substances, leading to potential premature or delayed filter replacements, which can result in contamination and increased costs.
Innovation Solution
A multi-port system with a challenge port and verification port in communication with the HEPA filter, allowing for the introduction of a challenge substance upstream and measurement of its concentration before and after passing through the filter, enabling accurate leak detection and filter condition assessment without physically accessing the sterile room.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional testing methods are used to detect leaks in HEPA filters, then leak detection can be performed, but the testing results are highly inaccurate due to inability to verify testing substance dispersion and lack of closed-loop verification
Solution Approach 1:
The system divides the testing process into distinct functional segments: a challenge port for introducing testing substance, a dispersal pipe with multiple apertures for distribution, a HEPA filter under test, and a detection port for measurement. This segmentation allows each component to perform its specific function optimally while enabling closed-loop verification of testing substance dispersion throughout the system.
Solution Approach 2:
The system implements feedback by using a detection port to measure the concentration of testing substance downstream of the HEPA filter and comparing it with the known amount introduced upstream. This closed-loop feedback mechanism verifies that the testing substance has dispersed properly and provides accurate measurement of filter performance, eliminating the guesswork in traditional methods.
2Reliability
If HEPA filters are tested frequently to ensure proper function, then contamination risk is reduced, but testing requires opening the ceiling of sterile rooms which introduces contamination risk
Solution Approach 1:
The system introduces an intermediary multi-port interface that connects testing equipment to the HEPA filter through sealed ports in the ceiling. This intermediary allows testing substances and measurements to pass through without requiring physical access to the filter or opening the sterile room ceiling, thus maintaining sterility while enabling frequent testing.
Solution Approach 2:
The multi-port interface serves multiple functions: it provides sealed access points for introducing testing substances, for sampling air downstream of the filter, and for connecting detection equipment. This universal interface enables various testing operations without modifying the sterile room structure or compromising the sterile environment.
3Reliability
If HEPA filters are replaced based on inaccurate test results, then premature replacement occurs increasing costs, but delayed replacement due to inaccurate results can lead to contamination
Solution Approach 1:
The system replaces complex manual testing procedures with a streamlined mechanical system that automatically introduces testing substance through the challenge port, disperses it through the dispersal pipe, passes it through the HEPA filter, and measures the downstream concentration. This automated mechanical system provides rapid, accurate results without requiring time-consuming manual dispersion verification or ceiling access.
Data Source
AI summary
A system and method for accurately and efficiently testing a HEPA filter in a sterile environment, such as a clean room, by creating a closed-loop system. The system includes a multi-port interface including at least a challenge port and a verification port, each port being in communication with an area upstream from the HEPA filter. Through the challenge port, test substances are introduced to a supply air duct that is in communication with a HEPA filter. Through the verification port, a concentration of the test substances can be measured for comparison with a concentration that passed through the HEPA filter, i.e. downstream from the HEPA filter. As such, test substances can be dispersed throughout the air conditioning system before interacting with the HEPA filter, and accurately measured. The closed loop between the ports provides an accurate measurement of the concentration of test substances to test the HEPA filter.