Dual HEPA Air Filter Layout Without External Exhaust Ducting
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Solution Overview
Problem
Existing air filtration systems in work environments, such as construction sites and hospital clean rooms, face challenges in effectively removing hazardous asbestos and particulates without the need for extensive ducting of filtered air outside the building, which is costly, time-consuming, and can cause contamination.
Innovation Solution
A method involving a primary air filter assembly and a secondary air filter assembly, where the first air output of the primary filter feeds the second air input of the secondary filter, providing twice-HEPA filtered air back into the closed work environment without ducting the exhaust air outside, using HEPA or carbon filter elements and operating both assemblies simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filtered air is ducted outside the building, then hazardous particulates are removed from the work environment, but extensive ducting is required which is expensive, time-consuming, and can cause contamination
Solution Approach 1:
The invention extracts the air filtration function from the traditional ducted exhaust system and relocates it directly into the work environment. By placing HEPA filter assemblies within the enclosed space, the system removes the need for extensive external ducting while maintaining effective particulate removal. The filter assemblies are positioned to receive air from the work area and discharge filtered air back into the same space, eliminating the harmful dependency on complex ductwork.
Solution Approach 2:
The HEPA filter assemblies act as intermediaries between the hazardous work environment and the surrounding space. Instead of directly ducting air outside, the filters serve as mediating devices that capture particulates within the enclosed area and release clean air back into the same environment, thereby eliminating the need for external ducting while still protecting against contamination spread.
2Productivity
If a primary air filter assembly is used to filter air in a closed work environment, then air is filtered, but the once-filtered air cannot be reused effectively without extensive ducting
Solution Approach 1:
The invention merges the primary and secondary filtration functions into a integrated system where both filter assemblies operate within the same enclosed space. The secondary filter receives air from the primary filter's discharge and provides additional filtration, creating a cascading filtration effect. This combined approach allows twice-filtered air to be discharged back into the work environment without requiring external ducting, thereby improving productivity while avoiding increased device complexity.
Solution Approach 2:
The filtration system employs a nested arrangement where the secondary filter assembly is positioned to receive air from the primary filter assembly. This nesting allows the output of one filter to become the input of another, creating a layered filtration approach that maximizes air cleaning efficiency within the confined space without requiring additional external infrastructure.
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 approach allows for efficient HEPA filtration of a closed room without the need for extensive ducting, reducing labor costs and preventing contamination, while maintaining a negative pressure environment to control the spread of hazardous particles.
Implementation Method 1
a first HEPA filter element and a second HEPA filter element, each having an outer peripheral edge
Implementation Method 2
maintaining a negative pressure environment throughout the work area for the duration of the work
Data Source
AI summary
Disclosed is a method of filtering air in a closed work environment that includes placing a primary air filter assembly in the closed work environment, where the primary air filter assembly includes a first air input and a first air output. The first air output is poised to emit once-filtered air outside the closed work environment. The method also includes placing a secondary air filter assembly in the closed work environment, where the secondary air filter assembly includes a second air input and a second air output.