Portable PCO Air Purifier for Hospital Microbial Reduction
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Solution Overview
Problem
Conventional HVAC systems in hospitals are ineffective in reducing airborne microbes due to filter placement remote from sources, slow air cycling, and single-pass air filtration, limiting their ability to mitigate the spread of infectious diseases.
Innovation Solution
A portable photo-catalytic oxidation (PCO) system is positioned proximate to sources of airborne contaminants in indoor spaces, operating at a high air exchange rate (16-32 air exchanges per hour) with a support medium having a MERV rating of 10-12 and titanium dioxide photocatalyst, capable of oxidizing contaminants, and is configured as a multi-pass system to enhance microbial load reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HVAC filters are positioned in the central system, then the system structure is simple, but the filter efficacy is reduced due to remote placement from contaminant sources
Solution Approach 1:
The invention divides the air filtration function into multiple segments: the central HVAC system provides baseline filtration, while portable PCO units provide targeted treatment near contaminant sources. This segmentation allows each component to operate optimally - the central system maintains overall air quality while portable units deliver high-efficacy treatment where needed, resolving the contradiction between simple system structure and high filter efficacy.
Solution Approach 2:
The portable PCO units act as intermediaries between the central HVAC system and the contaminant sources. These units are positioned strategically near patients or contaminant generation points to provide enhanced local treatment, bridging the gap between the remote central filtration system and the immediate need for air purification at the source.
2Productivity
If air is cycled through HVAC filters at standard rates, then energy consumption is moderate, but the air exchange rate is too slow to effectively reduce microbial load
Solution Approach 1:
The portable PCO units perform air exchange at excessive rates compared to standard HVAC requirements - achieving 16-32 air exchanges per hour locally versus the standard 6 per hour system-wide. This partial concentration of excessive action in critical zones effectively reduces microbial load without requiring the entire HVAC system to operate at high energy consumption levels.
Solution Approach 2:
The system implements local quality by providing high-rate air exchange (16-32 exchanges/hour) in specific areas near contaminant sources rather than uniformly throughout the entire facility. This localized high-performance treatment reduces microbial load at critical points without proportionally increasing overall energy consumption across the whole HVAC system.
3Reliability
If single-pass filtration is used in central HVAC, then the system operation is simple, but the microbial reduction capability is limited
Solution Approach 1:
The portable PCO units implement multi-pass continuous treatment of air in the immediate vicinity of contaminant sources. Air is repeatedly circulated through the PCO units multiple times per hour, ensuring continuous microbial reduction activity. This continuity of useful action at the local level compensates for the single-pass limitation of the central HVAC system.
Solution Approach 2:
The filtration system is segmented into two functional layers: the central HVAC system performs single-pass filtration for overall air distribution, while portable PCO units perform multi-pass continuous treatment in localized zones. This segmentation allows the complex multi-pass function to be implemented only where most needed, without requiring complete system-wide complexity.
4Reliability
If portable PCO systems are positioned near contaminant sources, then microbial load reduction is enhanced, but the system requires precise positioning and setup
Solution Approach 1:
The portable PCO units are designed to be self-contained and self-operating, requiring minimal setup or complex positioning procedures. Each unit independently performs air circulation and photocatalytic oxidation without requiring external control or precise alignment, making them easy to deploy and reposition as needed while maintaining high microbial reduction effectiveness.
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 PCO system significantly reduces airborne microbial loads, demonstrated by a 54.2% reduction near hospital beds and 26.7% reduction near exit doors, effectively mitigating the risk of healthcare-associated infections by repeatedly treating and purifying air before recirculation.
Implementation Method 1
a portable photo-catalytic oxidation (PCO) system proximate a source of contaminants in the indoor space
Data Source
AI summary
Systems and methods of reducing airborne contaminants, such as airborne microorganisms, including bacterial, viral, and fungal microbes, in an indoor space are disclosed. The method includes positioning a portable photo-catalytic oxidation system proximate a source of contaminants in the indoor space and activating the photo-catalytic oxidation system to circulate air through the photo-catalytic oxidation system at a rate ranging from approximately 16 to approximately 24 air exchanges per hour in the indoor space. The photo-catalytic oxidation system is configured to oxidize contaminates in the air.