INVESTIGATION OF THE DYNAMICS OF AIR IONIC COMPOSITION OF AIR AT THE WORKPLACE OF A PERSONAL COMPUTER USER, TAKING INTO ACCOUNT ELECTROMAGNETIC FACTORS

Abstract

The dynamics of air ionic composition of air at the workplaces of users equipped with a portable personal computer has been studied. It is established that in the absence of deionizing and factors (operation of ventilation and cooling systems, increasing the concentration of fine dust and aerosols, etc.) there is a significant deionization of air. The reason is the appearance of electrostatic charges on the body and keyboard of the laptop, table surface and work chair. Under the conditions of experiments, the electrostatic field strength on the display reached 4.5 kV/m, the keyboard – 9.0 kV/m, the surface of the operator's chair – 6.5 kV/m. This resulted in a decrease in the concentrations of negative air ions from 910 cm-3 to 420 cm-3; positive – from 1000 cm-3 to 390 cm-3 in the presence of a user who performed standard work. It is determined that at a distance of 0.5–0.6 m from the laptop the concentrations of air ions stabilize at the normative level. That is, the deionization zone can be considered a space with a radius of up to 0.6 m. Normalization of air ion concentrations is possible due to the directed movement of air in the room with the standard speed (up to 0.4 m/s). But at the same time, despite the low speeds, the drift of air ions in a magnetic field is possible, which can occur during long-term operation. It is advisable to consider the use of antistatic agents to minimize static charges on polymer surfaces.