A particle electrical mobility classifier is provided for the classification of particles (e.g., particles less than 1 .Math. in size) based on their electrical mobility. The particle classification zone is curved. In an exemplary embodiment, two metal concentric cylinders, separated by an annular insulation spacer, establish a particle classification zone. A DC electrical field is supplied by the cylinders in the circular classification zone. An example classifier can be operated in different modes such as: (1) as a particle precipitator; (2) as a particle electrical mobility separator, and (3) as a differential mobility classifier. The curved classification zone results in a particle classifier having an extended particle sizing range as compared to their counterparts in classical configurations. The curve of the classification channel (in the flow direction) may be in any of several configurations (e.g., circular, wavy, spiral, or helical).

The present disclosure relates to a fine dust removal system including a conductive filter module, and more particularly, to a fine dust removal system having a conductive filter module which includes a cylindrical conductive filter to thereby implement high fine dust removal efficiency with low pressure loss and which can be easily, generally applied to and used in an air cleaner to be installed in windows or in an independent indoor air cleaner.

An electronic air filter containing a tubular collecting electrode and an ion emitting electrode located concentrically inside of the tube-like collecting electrode, the collecting electrode consists of outer electrically conductive shell and inner layer made of open cell porous material.

Provided are purification systems and methods of using such systems for purifying various environments, such as indoor air, outdoor air, vehicle emissions, and industrial emissions. A purification system comprises an ionizing purifier having a substrate and an active coating. The active coating comprises a pyroelectric and/or piezoelectric material. During the operation, an incoming stream is directed toward the active coating while controlling the average pressure exerting on the active coating. This contact between the incoming stream and the active coating generates negative ions from components of the incoming stream via change in temperature and pressure/force/vibration, etc. The negative ions then interact with pollutants, transforming them into safe, purified materials of the outgoing stream. Unlike the pollutants in the incoming stream, the purified materials are non-harmful, and/or can be easily removed from the outgoing stream, e.g., by filtering and/or other separation techniques.

The invention relates to a method and device for collecting particles which may be present in an aerosol. The invention consists in electrostatically collecting all the particles in an aerosol, but uncoupling mechanisms of particle charging by unipolar ion diffusion, for charging then collecting the finest particles, from particle charging by a corona effect electrical field, for charging then collecting the biggest particles in a different collection zone from the collection zone for the finest particles. The invention also relates to the use of such a device as ionisation chamber or for evaluating the exposure of workers or consumers to nanoparticles.

Known wet electrostatic precipitators are large and inefficient. The present invention enables the production of smaller, more efficient and long lasting wet electrostatic precipitators by the addition of a central bore in the inner electrode through which a first purge flow is passed and directed into the precipitator chamber, perpendicular to the direction of flow of the gas to be treated through the chamber to urge the particulate into the water curtain. A second, larger, cleaning purge flow is also provided to disturb the water curtain such that it cleans the inner electrode of any deposited particulate.

Known wet electrostatic precipitators are large and inefficient. The present invention enables the production of smaller, more efficient and long lasting wet electrostatic precipitators by the addition of a central bore in the inner electrode through which a first purge flow is passed and directed into the precipitator chamber, perpendicular to the direction of flow of the gas to be treated through the chamber to urge the particulate into the water curtain. A second, larger, cleaning purge flow is also provided to disturb the water curtain such that it cleans the inner electrode of any deposited particulate.

A device for cleaning of indoor air comprising capacitor precipitators, each consisting of two electrode elements or two groups of electrode elements connected to the respective pole of a high voltage source, air transported fans, at least one corona electrode and at least one counter electrode. The corona electrode and the counter electrode are each connected to the respective pole of a high voltage source. The device includes two air flow ducts for the air to be cleaned, which air flow ducts are placed along an axial reference line (AA) at a distance (d) from each other in the direction of the axial reference line (AA). Each air flow duct is associated with a capacitor precipitator and an air moving fan. At least one corona electrode is provided in the space between the air flow ducts. At least one counter electrode is located adjacent to the air flow ducts circumference. The air flow direction through the one air flow duct is diametrically opposite the air flow direction through the second air flow duct, and the air to be cleaned is passed into the space between the air flow ducts.

An HVAC system having an air cleaner, a fan that selectively generates an air flow at least partially through the air cleaner, and a controller that establishes a functional relationship between an air flow related criterion and a correlated power level setting of the air cleaner, determines an air flow related criterion value, determines a correlated power level setting value using the determined air flow related criterion value and the functional relationship, and controls the air cleaner as a function of the determined correlated power level setting value is disclosed.

An HVAC system having an air cleaner, a fan that selectively generates an air flow at least partially through the air cleaner, and a controller that establishes a functional relationship between an air flow related criterion and a correlated power level setting of the air cleaner, determines an air flow related criterion value, determines a correlated power level setting value using the determined air flow related criterion value and the functional relationship, and controls the air cleaner as a function of the determined correlated power level setting value is disclosed.