Three-Stage Rail HVAC Air Purification for Pathogen Removal
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Solution Overview
Problem
Conventional HVAC systems in rail vehicles are ineffective in filtering out airborne viruses, including COVID-19, posing a significant risk during pandemics and highlighting the need for improved air treatment systems.
Innovation Solution
An air purification system comprising an intense field dielectric filter, ultraviolet germicidal irradiation, and a dielectric barrier discharge unit, which synergistically work to charge, filter, and destroy pathogens in the air, ensuring effective removal of airborne pathogens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HVAC systems are used in rail vehicles, then the system complexity is low and ease of operation is maintained, but the ability to filter out airborne viruses is insufficient
Solution Approach 1:
The air purification process is divided into three distinct stages: (1) pre-filtration through a HEPA or ULPA filter to remove larger particles, (2) UV-C irradiation to inactivate pathogens, and (3) ozone generation to destroy remaining contaminants. Each stage operates independently with its own mechanism, allowing the system to achieve high reliability through modular functionality while maintaining manageable complexity.
Solution Approach 2:
The system transforms air treatment from simple mechanical filtration to a multi-parameter process involving physical filtration (particle size), electromagnetic radiation (UV-C wavelength 254nm), and chemical oxidation (ozone concentration). By changing the physical and chemical parameters of air treatment, the system achieves superior pathogen removal effectiveness.
2Reliability
If a three-stage air purification system is implemented, then pathogen elimination effectiveness increases to 99.99998%, but energy consumption and device complexity increase
Solution Approach 1:
The pre-filtration stage removes larger particles and reduces the load on subsequent stages, allowing UV-C and ozone to focus on inactivating and destroying smaller viral particles. This preliminary action increases overall system efficiency by preventing energy waste on already-removed contaminants and extending the lifespan of high-energy components.
Solution Approach 2:
The three stages operate continuously in sequence, with each stage maintaining its function without interruption. The HEPA/ULPA filter continuously captures particles, UV-C continuously irradiates air passing through, and ozone continuously generates to destroy remaining pathogens. This continuous operation ensures consistent 99.99998% pathogen elimination effectiveness while optimizing energy utilization across all stages.
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 system achieves a significant reduction in aerosolized viruses, with up to 99.99998% elimination within 60 minutes, providing a high level of safety and reducing the risk of infection, validated through laboratory testing.
Implementation Method 1
An intense field dielectric filter having a plurality of channels formed therethrough is aligned with the openings of the intense field generator. Each channel is defined by a first surface comprising a first electrode and a second surface opposing the first electric and comprises a second electrode, wherein the first electrode and the second electrode are encompassed by a dielectric material, to generate a corona discharge in the openings and charge any particles in the air flow.
Implementation Method 2
An ultraviolet radiation source is positioned to direct ultraviolet illumination into the passageway.
Implementation Method 3
A dielectric barrier discharge unit having a high voltage electrode coupled to a dielectric barrier and a ground electrode spaced apart from the high voltage electrode is used to form a low temperature plasma chamber that is in communication with the passageway so that the ions created in the plasma chamber will attach to and destroy any remaining particles in the air flow.
Data Source
AI summary
An air purification system for use with rail car HVAC system to remove or destroy harmful pathogens in the air. The air purification system has a housing with an inlet, an outlet, and a passageway extending between the inlet and the outlet. An intense field generator and filter is used to charge any particles in the air and remove them from the air flow. An ultraviolet radiation source is positioned to direct ultraviolet illumination into the passageway. Finally, a dielectric barrier discharge unit having a high voltage electrode coupled to a dielectric barrier and a ground electrode spaced apart from the high voltage electrode is used to form a low temperature plasma chamber is in communication with the passageway so that the ions created in the plasma chamber will attach to and destroy any remaining particles in the air flow.