Air purification and sterilization unit
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Solution Overview
Problem
Conventional air purification systems, including HEPA filtration, activated carbon filters, electrostatic filters, UV germicidal irradiation, and photocatalytic oxidation (PCO) systems, face limitations such as filter clogging, inability to treat surface contaminants, inefficient contaminant destruction, and suboptimal airflow, leading to reduced treatment effectiveness and increased operational demands.
Innovation Solution
An air purification device combining HEPA filtration with PCO technology, featuring a strategically positioned photocatalytic oxidation unit with reflective structures and tailored ultraviolet lamps, generates oxidizers that effectively purify and sanitize both air and surfaces, optimizing airflow and photocatalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photocatalytic oxidation unit is positioned within airflow path, then contaminant destruction is improved, but airflow restriction increases
Solution Approach 1:
The photocatalytic oxidation unit is segmented into multiple cell panels with apertures, allowing air to pass through while maintaining contact with the catalyst surface. This segmentation enables both contaminant destruction and airflow throughput to be optimized simultaneously.
Solution Approach 2:
The catalyst is presented as a panel structure with apertures rather than a solid block, adding a dimensional aspect (aperture geometry) that allows airflow through the catalyst structure while maintaining sufficient contact area for oxidizer generation.
2Power
If UV lamp irradiates catalyst material directly, then oxidizer generation is improved, but UV light may create harmful byproducts
Solution Approach 1:
The UV lamp wavelength is specifically selected to be 254 nm, which is optimal for activating the photocatalyst while minimizing the formation of harmful byproducts. This parameter optimization balances oxidizer generation with safety.
3Reliability
If airflow contact with catalyst is increased, then oxidizer mixing is improved, but system power demand increases
Solution Approach 1:
The photocatalytic oxidation unit is positioned upstream in the airflow path, allowing oxidizers to be generated and mixed with air before the air reaches the fan. This preliminary mixing reduces the energy required for fan operation while maintaining effective contaminant contact.
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 device achieves enhanced contaminant removal and surface sanitization, reducing airborne pathogens by up to 6 log within 60 minutes, with improved efficiency and reduced power consumption, while minimizing ozone generation.
Implementation Method 1
Photocatalytic oxidation (PCO) air purifiers are somewhat similar to UV air purification systems in that they also utilize UV light. However, rather than using the UV light to directly interact with passing contaminants, PCO systems direct UV light onto a catalyst material. Water molecules in the ambient air then interact with the UV light and the catalyst to generate a variety of oxidizers such as hydroxyl radicals. The oxidizers can then attack organic molecule contaminants and degrade them into less harmful substances.
Implementation Method 2
The photocatalytic oxidation unit includes at least one photocatalytic cell panel extending along the longitudinal axis, one or more ultraviolet lamps extending along the longitudinal axis and configured to emanate ultraviolet light toward the at least one photocatalytic cell panel
Implementation Method 3
a reflector disposed within the photocatalytic oxidation unit
Data Source
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AI summary
Disclosed is an air purification device having a housing for holding a photocatalytic oxidation (PCO) unit and a fan assembly. The device may also optionally include a filter compartment for holding a filter such as a HEPA filter. The air purification device is configured to provide effective purification and sanitation of air in a targeted indoor environment, and in particular in a medical environment such as a hospital.