Fan Filter Unit Layout for Fast Multi-Point HEPA Testing
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Solution Overview
Problem
The existing fan filter units face challenges in performing multi-point capacity measurements of HEPA filters due to the presence of multiple components like fans and drive motors, making it difficult and time-consuming, especially in urgent scenarios such as temporary hospital construction during the COVID-19 pandemic.
Innovation Solution
The integration of a first and second HEPA filter with an exhaust means within a housing, facilitated by an aerosol introduction port between them, allows for easy and efficient performance measurement at multiple points using an aerosol relative densitometer, enabling quicker evaluation and installation of temporary hospitals or isolation spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components (fan, drive motor, HEPA filter) are provided in advance, then the fan filter unit can perform dust capturing and purification functions, but multi-point capacity measurement becomes difficult and time-consuming
Solution Approach 1:
The patent divides the measurement process into separate measurement points (first measurement point near the fan, second measurement point near the HEPA filter) and uses separate measurement devices for each point. This segmentation allows independent measurement at different locations without requiring complex coordinated measurement of all components simultaneously, thereby reducing measurement time while maintaining comprehensive performance verification.
Solution Approach 2:
The patent introduces an intermediary measurement device (aerosol relative densitometer) that can be independently positioned at different measurement points. This intermediary device serves as a mediator between the measurement system and the fan filter unit components, enabling flexible multi-point measurement without requiring direct interaction with or coordination of all components (fan, motor, filter) simultaneously.
2Ease of operation
If one-point measurement or batch measurement is used, then measurement process is simplified, but performance may be erroneously determined as satisfied when parts do not satisfy performance
Solution Approach 1:
The patent segments the measurement process into multiple distinct measurement points (first measurement point for fan-side performance, second measurement point for filter-side performance) with separate measurement devices. This segmentation enables evaluation at different critical locations, ensuring that performance is verified at specific points rather than averaged, thereby preventing erroneous satisfaction determination while maintaining operational simplicity through independent point measurements.
Solution Approach 2:
The patent applies local quality measurement by evaluating performance at specific localized points (near the fan and near the HEPA filter) rather than measuring the entire filter uniformly. Each measurement point has its own device and evaluation criteria, allowing localized performance assessment that identifies specific areas of non-compliance without requiring complex overall measurement systems.
3Reliability
If rigorous performance guarantee is required, then multi-point capacity measurement is necessary, but the presence of multiple components makes measurement difficult
Solution Approach 1:
The patent segments the measurement system into independent measurement points with dedicated devices (first measurement device near fan, second measurement device near filter). This segmentation reduces overall system complexity by allowing independent, modular measurements at different locations rather than requiring a single complex coordinated measurement system to handle all components simultaneously.
Solution Approach 2:
The patent uses intermediary measurement devices (aerosol relative densitometers) that can be independently positioned and operated at different measurement points. These intermediary devices simplify the measurement process by serving as independent measurement nodes that don't require direct integration with or coordination of the fan, motor, and filter components, thereby reducing measurement system complexity while maintaining rigorous performance verification.
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 solution enables rapid and accurate HEPA filter performance measurement at multiple points, expediting the construction of temporary hospitals and isolation spaces by reducing the time required for testing and ensuring rigorous performance guarantees.
Implementation Method 1
it is necessary to perform capacity measurement at multiple points on a HEPA filter plane
Implementation Method 2
using an aerosol relative densitometer
Data Source
AI summary
Provided is a fan filter unit with which the performance of a HEPA filter can be measured at multiple points with ease and in a short time. The fan filter unit has a first HEPA filter, a second HEPA filter, and exhaust means installed between the first HEPA filter and the second HEPA filter. The first HEPA filter, the second HEPA filter, and the exhaust means are integrated by a housing.