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EFA air disinfection using KronosTM based air purifiers


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Electrostatic Air Filtration and Purification systems developed by Kronos Air Technologies use positive corona discharge to simultaneously and silently move air and perform air filtration (e.g. particulate removal) and air purification (e.g. microorganism destruction). This paper presents recent experimental results demonstrating high efficacy of Kronos based air purifiers in capturing and destruction of various types of microorganisms in different environmental settings.
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The mechanism of gas movement in the electric wind is considered and an approximate theory presented which relates relevant electrical and mechanical quantities. Among others, the following relationships are shown to hold: Velocity is a linear function of voltage and is proportional to the square root of current; if the density of the gas is not too low the efficiency of electrokinetic conversion is proportional to the density and the velocity is independent of the density; near sparkover efficiency is independent of voltage; velocity increases slowly as blowers are stacked in series; the rate of ozone generation in the corona discharge in air is an increasing function of electric-wind velocity. The forms of the equations relating these variables are found to hold in a variety of cases even though assumed boundary conditions are not observed experimentally. The practical utility of an electrostatic blower is limited by an efficiency of operation in the neighborhood of one percent. A survey of the literature and an extensive bibliography are included. (Author)
A theory of pressure buildup under unipolar ion conduction is presented and verified experimentally. Constriction of the current flow leads to sizeable pressures in insulating liquids.
The application of an electric field to a combustion system can produce large and potentially useful effects, such as reducing carbon formation, affecting flame velocity, extending flammability limits, increasing flame luminosity, and stabilizing and extinguishing flame. The present study is concerned primarily with the corona discharge interaction with pool fires. The fuel surface served as the blunt electrode and several specially designed sharp probes have been examined as the high-voltage electrode. The most effective sharp electrode appeared to be a simple thin wire parallel to the liquid surface situated above it at a distance of several millimeters. The flame was repelled from the probe, thus creating a possible pool flame extinction device. Similar results were achieved with a mechanical blower that reproduced the velocity profile of the electric wind. The gas composition in different locations was examined for both the corona and blower cases. No significant difference was found, and it was concluded that ion pumping has no influence on the extinction performance. It is suggested that extinction by corona discharge is caused solely by the aerodynamic action of the electric wind with its remarkably flat, sharp velocity profile. Fire extinctions under hot and aggressive environments are possible applications of the present device.
A broad survey has been conducted of electrohydrodynamic phenomena in which the electric field may be simply static or electrodynamic in nature. Recent developments of new materials have made it possible for relatively high electromagnetic fields to penetrate flow tubes and containers, thus emphasising the need for an electrodynamic approach to the subject. Some engineering problems are introduced in which electromagnetic hydrodynamics plays an important role. The review of the current state of the art is intended to supplement earlier ones and to broaden the scope of the topic to include two-phase flow and electrodynamic field effects
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