Abstract
This paper reports a substantiated method and a designed device for controlling the concentrations of air ions in premises in accordance with the European standards SBM 2015. The use of an ultrasonic humidifier with a capacity of 25 W for two hours increases the concentration of negative ions around the device from 240 to 560 cm-3, positive ones ‒ from 260 to 410 cm-3. The intensity of the electrostatic field of a polymeric coating decreases from 5.1 to 0.2 kV/m. The disadvantage of the humidifier is a small radius of influence (1.0–1.5 m) and the inability to control the polarity of ions. It has been experimentally established that air cooling systems (split systems) deionize the air of the premises. Degrees of deionization and dominating polarity are unpredictable and different for devices of different manufacturers and brands. To control the ion composition of the air simultaneously with the maintenance of normative relative humidity and stresses of static fields, the structure was proposed and the effectiveness of a bipolar ultrasonic air ionizer with adjusted performance and dominating polarity has been tested. The maximum productivity of the ionizer is 4,000–5,000 cm-3. The radius of exposure is 5 m (reducing the concentration of ions with a distance to 500 cm-3). To pass the ionized air through an air capacitor, the number and predominant polarity of air ions are regulated by the polarity and voltage on the covers of the capacitor. It was established that in order to service a room with an area of 50 m2, an ultrasonic emitter with a capacity of 25 W would suffice. The adjustability of the device performance makes it possible to reduce or increase the service area. The ability to purify air from suspended particles is shown. During the two hours of operation of the ionizer, the dust content decreased from 4.3–4.4 mg/m3 to 1.4–1.6 mg/m3.
Highlights
The aim of this work is to devise a method for controlling the concentrations of ions in the air of premises for various purposes, which would ensure the normalization of ion concentrations, the intensity of electrostatic fields of the developed ultrasonic device
Relative humidity, and intensity of the electric field of electrostatic charges of the polymer surface depending on the time of operation of the ultrasonic humidifier in the morning
Our original studies into the dynamics of the ion composition of the air of industrial and household premises have proved that the means of normalizing the concentrations of ions of both signs, relative humidity and temperature is the use of air-cooling devices and ultrasonic humidifiers
Summary
The physical and chemical properties of air are one of the main indicators of the quality of the industrial and household environment. In most industrial and household conditions, air quality is assessed by microclimatic Ecology indicators such as temperature, relative humidity, and the speed of directed air movement. Given the ambiguous impact of the ventilation system, the electrification of polymer surfaces, the different air quality outside the premises used for ventilation, it is a relevant task to devise common principles for controlling air quality in rooms for various purposes This requires experimental studies into the dynamics of microclimatic parameters, subject to the functioning of cooling and humidification systems, artificial ionization, etc. That would make it possible to work out organizational and technical measures for the normalization and maintenance at the regulatory level of all critical parameters that affect the air quality of industrial and public premises
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