Provided are an apparatus and a system for classifying particles. The apparatus for classifying particles includes: an internal electrode which has a column shape; an external electrode which is spaced apart from the internal electrode and disposed to surround the internal electrode, and generates an electric field through an interaction with the internal electrode; and an aerosol supply unit which supplies aerosol particles to a separation space between the internal electrode and the external electrode, in which the separation space, through which the aerosol particles are introduced into the particle classifying apparatus and flow, is formed to be narrowed toward a lower aerosol flow side from an upper aerosol flow side into which the aerosol particles are introduced.

Provided are an apparatus and a system for classifying particles. The apparatus for classifying particles includes: an internal electrode which has a column shape; an external electrode which is spaced apart from the internal electrode and disposed to surround the internal electrode, and generates an electric field through an interaction with the internal electrode; and an aerosol supply unit which supplies aerosol particles to a separation space between the internal electrode and the external electrode, in which the separation space, through which the aerosol particles are introduced into the particle classifying apparatus and flow, is formed to be narrowed toward a lower aerosol flow side from an upper aerosol flow side into which the aerosol particles are introduced.

ESP particle collector (1) for collecting particles in a particle containing gas stream, comprising an inlet section (4), a collector section (6), and an electrode arrangement (8), the inlet section comprising a flow tube (10) defining a gas flow channel (12) therein bounded by a guide wall (24) extending between an entry end (14) and a collector end (16) that serves as an inlet to the collector section (6), the entry end comprising an inlet (28) for the particle gas stream and a sheath flow inlet portion (26) for generating a sheath flow around the particle gas stream, the collector section comprising a housing (18) coupled to the flow tube, and a collector plate (20) mounted therein having a particle collection surface (23). The ESP particle collector is configured to allow optical analysis of the collector plate particle collection surface to measure particles collected thereon. The electrode arrangement comprises at least a base electrode (8a) positioned below the collection surface and a counter-base electrode (8b) positioned at a separation distance L2 above the collection surface such that an electrical field is generated between the electrodes configured to precipitate said particles on the collection surface, wherein the electric field is in a range of 0.1 kV per mm to 1.5 kV per mm, with an absolute voltage on any said electrode that is less than 10 kV, and wherein a ratio ratio I of a radius L1 of said inlet at the collector end divided by said separation distance L2 is in a range of 0.8 to 1.2.

A commercial cooking equipment exhaust hood system includes a hood structure including an inlet opening to an exhaust flow path through the hood. A filter unit is positioned along the exhaust flow path. An electrostatic precipitator unit is downstream of the filter unit. The electrostatic precipitator includes an ionizing section upstream of a collecting section. The ionizing section includes a plurality of ionizing flow paths having side profile patterns that vary in width between at least one wide section and at least one narrow section. The collecting section includes a plurality of collecting flow paths with side profile patterns of substantially uniform width and a repeating undulating side profile pattern. A UV light source may also be provided within the hood, with a controller operatively connected to control the UV light source via a dimmer to enable selective production various UV levels.

An air cleaner includes a rear filter receiving air from the outer environment, an ionizer grid connected to a high voltage power supply and having wires extending between opposite sides of a frame such to emit positively charged ions and apply an electrostatic charge on the air received from the rear filter; a collector grid connected to ground and having wires extending between opposite sides of a frame, the combination of the ionizer and collector grids causing the air to move toward the collector grid; a front filter collecting contaminants suspended in the air received from the collector grid; and an apparatus frame housing the rear filter, the ionizer and collector grids, and the front filter, wherein the frames of the ionizer and collector grids are suspended within the apparatus frame with isolating members made of a non-arc tracking material, such to minimize coronal discharge and reduce audible noise.

A dust collector in an embodiment includes: a discharge electrode having tips; a counter electrode including a plurality of conductor plates each having an end opposed to the discharge electrode and arrange side by side in a plate thickness direction; and a power supply that applies voltage between the discharge electrode and the counter electrode. The counter electrode has a first region closer to the tips and a second region farther from the tips than the first region, and at least one of an interval, a distance from the tips, and a shape of at least part of ends in the first region is different from an interval, a distance, or a shape in the second region.

A gas purifying apparatus, including: at least one cylindrical ground electrode configured to receive gas flowing therethrough; a discharge electrode disposed centrally within each of the at least one cylindrical ground electrode; and a power supply electrically connected to the discharge electrode and the at least one cylindrical ground electrode so as to produce an electric field and a corona discharge from the discharge electrode to a corresponding cylindrical ground electrode to generate ions and free electrons into the gas to ionise substances in the gas for gas purification, wherein the discharge electrode and the corresponding cylindrical ground electrode form at least one plasma chamber when power from the power supply is applied, and wherein the discharge electrode includes: at least one annular plate having an outer edge extending towards the corresponding cylindrical ground electrode.

An air treatment system having an improved control system. The control system may include a dynamic dead front display that varies the display based on mode of operation. The display may include capacitive touch sensors and include an array of capacitive film segments or traces integrated into the display. The control system may include a self-contained electronics module that can be tested and calibrated before installation in the ATS. A dust sensor assembly may be integrated into the electronics module. The front cover may be attached with a mechanical attachment at the top and a magnetic attachment on the bottom. The ATS may include a filter retainer assembly with a rotating clip configured to perform in a cam-like manner to firmly clamp the particulate filter and carbon filter in place.

A split air conditioner has a cabinet with a fan and evaporator for mounting within a structure. The cabinet includes one or more movable dampers or movable filters positioned in the flow path between the air inlet and the outlet for selectively filtering contaminants from the air to provide a greater or lesser degree of filtration of the air. The movable filters include sliding and/or pivot mounting structure which may accommodate stacking multiple filters with different filtering characteristics. The system may operate in a filtering only mode with no cooling, a cooling only mode with no filtering, or a combination of cooling and selective filtering.

An electrostatic air cleaning device comprises a particle charging section, a panicle precipitation section, a current sensor for measuring an electric current flowing through electrode plates of the precipitation section and a relative humidity sensor. The voltage applied to the electrode plates and the air flow through the device are am trolled in dependence on the measured current flowing through the electrode plates. In this way, control is provided to prevent excessive electric leakage currents inside the precipitation section, that may lead to a hazard, and to optimize the energy efficiency of the cleaning device in relation to its cleaning performance. The relative humidity information also enables diagnosis of the cause of the high leakage current and the status of the precipitation section concerning the amount of precipitated particles therein.