Methods and systems described perform air cleaning and/or sanitization in a heating, ventilation, air conditioning, and/or refrigeration (HVACR) system by detecting a concentration of airborne contaminants in a space serviced by the HVACR system. The detected concentration of airborne contaminants is determined whether it exceeds a threshold relative to a capacity of a first air cleaner. When the detected concentration of airborne contaminants exceeds the threshold, a second air cleaner is selected and enabled to be activated in the space. When the detected concentration of airborne contaminants does not exceed the threshold, the first air cleaner is selected and enabled to be activated in the space. The first air cleaner has a cleaning material different from the second air cleaner, and the first air cleaner, relative to the second air cleaner, treats the space at a lower concentration of airborne contaminants. The second air cleaner includes specifically designed cleaner modules.

A photocatalyst filtration system for a vehicle includes a housing having an airflow path, and a filter configured to filter air flowing in the airflow path, the filter having a first photocatalyst and a second photocatalyst. The system further includes a first ultraviolet (UV) light source disposed proximate the filter and configured to energize the first photocatalyst, and a second UV light source disposed proximate the filter and configured to produce light having a shorter wavelength than light produced by the first UV light source, and configured to energize the second photocatalyst. One of the first photocatalyst or the second photocatalyst is configured to remove odor from the air. The other of the first photocatalyst or the second photocatalyst is configured to remove bacteria from the air.

Disclosed herein is a photocatalytic oxidation device configured for integration within a vehicle ventilation system. The device includes a frame, an ultraviolet lamp, and a cell coated with a photocatalytic material. The lamp, when activated, causes the generation of oxidizers at the cell panel. Air is passable through apertures of the cell panel and thus may be moved through the device. The device is structurally configured and dimensionally optimized to provide effective photocatalytic activity within the vehicle ventilation system without overly restricting airflow.

In a photocatalytic device, a photocatalytic filter is formed of a corrugated member and a gas is allowed to flow over front and rear surfaces of the filter from one end toward the other end thereof along a direction in which ridges and valleys extend, and a gas inflow part and a gas outflow part are provided at both end positions of a photocatalytic filter instead of providing a gas inlet-side flow channel and a gas output-side flow channel at positions facing filter surfaces. Thus, a contact area between a gas and the filter surfaces can be maintained, and miniaturization of the device such as reduction in the thickness or diameter can be realized without increasing gas circulation resistance. In addition, enhanced light irradiation efficiency, simplified structure, energy saving, and cost reduction can be realized. Moreover, the problem of heat can be solved.

An air purification system includes a housing having an air inlet and an air outlet, an air circulation unit disposed between the air inlet and the air outlet, and an air purification assembly disposed adjacent the air circulation unit. The air circulation unit may be configured to circulate air from the air inlet to the air outlet. The air purification assembly includes a UV-A light source, a UV-C light source, and a photocatalytic filter configured to activate responsive to light produced by each of the UV-A and UV-C light sources. The UV-A light source and the UV-C light source may be oriented to illuminate the photocatalytic filter and the air purification assembly is configured to purify the air circulated by the air circulation unit.

A gas detection and purification device can be placed in an in-car space and includes a housing, a purification module, a gas-guiding unit, and a gas detection module. The housing has a gas inlet and a gas outlet. A gas channel is between the gas inlet and the gas outlet. The purification module is disposed in the gas channel to filter the gas guided into the gas channel. The gas-guiding unit is disposed in the gas channel and at one side of the purification module. The gas-guiding unit guides the gas into the device from the gas inlet, guides the gas to pass through the purification module for performing filtering and purifying, and discharges the gas out from the gas outlet. The gas detection module is disposed in the gas channel to detect the gas guided into the housing to obtain gas detection data.

A compound filter module includes an upper body in which at least one side of an upper portion is opened, an UV irradiation unit which is coupled to a lower portion of the upper body, includes a plurality of UV LEDs, and is configured to perform irradiation of UV from a lower body side, a disk-shaped photocatalyst cartridge which is located below the UV irradiation unit and includes a plurality of photocatalytic beads including a photocatalyst reacting with UV emitted from the UV irradiation unit, a disk-shaped zeolite cartridge which is located below the photocatalyst cartridge and includes a plurality of zeolite beads adsorbs harmful substances from the polluted air sucked through the lower body, and the lower body which is located below the zeolite cartridge and in which at least one side of a lower portion is formed to be opened, in which each of the photocatalyst cartridge and the zeolite cartridge includes at least one through hole which is formed in an up-down direction.

A photocatalyst device including: a body; a light source part fixed to the body to irradiate ultraviolet light and having an LED and a substrate for fixing the LED thereto; a catalyst part fixed to the body to conduct photocatalytic reaction with the light irradiated by the light source part and thus to generate superoxygen radicals; and a heat radiating part disposed on the light source part to radiate the heat generated from the light source part, whereby the photocatalyst device purifies air and sterilizes and deodorizes the evaporator, while being easily mountable as a single module.

An air purification unit has a housing which has at least one inlet opening for delivering an air stream and at least one outlet opening for discharging the air stream delivered via the inlet opening. At least one air purification unit and at least one lighting unit are arranged in the housing, wherein the at least one air purification unit and the at least one lighting unit are arranged opposite one another in the housing. The at least one air purification unit has at least one photocatalytically active surface region. The air stream is guided in the housing at least partially along the at least one photocatalytically active surface region of the at least one air purification unit, wherein the surface region is at least partially coated with titanium dioxide or doped with titanium dioxide ions ions.

A fluid treatment apparatus including a photocatalyst filter having a first surface and a second surface, a light source unit spaced apart from the photocatalyst filter to provide light to the first surface, a housing including an inlet, an outlet, and a flow path formed between the photocatalyst filter and the light source, and a guide member disposed at one side of the housing and including at least one slat to guide a movement direction of a fluid, in which the slat is inclined at least in a direction closer to the first surface of the photocatalyst filter along an advancing direction of the flow path when an air flow rate of the fluid has a first value, and in a direction away from the first surface of the photocatalyst filter along the advancing direction when the air flow rate of the fluid is greater than the first value.