Germicidal lighting fixture using photocatalytic oxidation
A purification system has a reaction chamber, a fan coupled to the reaction chamber communicating air through the reaction chamber, a light source having a first wavelength directed at air passing through the reaction chamber and a surface comprising a photocatalyst. The light source is directed at the surface comprising the photocatalyst.
1 . A purification system for a ceiling system comprising:
a housing having a lateral direction and a longitudinal direction;
a first deflector;
a plurality of baffles each comprising a parabolic portion having a curved surface with a photocatalyst;
a reaction chamber comprising a plurality of flow cavities extending across the reaction chamber in the lateral direction defined by the plurality of baffles disposed within the reaction chamber;
a fan coupled to the reaction chamber communicating air into the reaction chamber and the flow cavities therein; and
a plurality of light sources, each light source associated with a respective one of the plurality of baffles so that each light source is positioned in each flow cavity at an intersection of the respective baffle and the housing, each light source having a first wavelength and each light source generating light directed at the surface of the parabolic portion having the photocatalyst so that light reflected from the parabolic portion is directed in a parallel direction within the flow cavities and laterally within the flow cavities and at air passing laterally through the flow cavities in a direction of the air within the flow cavities.
2 . The purification system of claim 1 wherein the fan directs air from within the reaction chamber to the curved surface of each of the plurality of baffles.
3 . The purification system of claim 1 wherein the light source comprises a first light source generating light at a first wavelength and a second light source generating light at a second wavelength.
4 . The purification system of claim 3 wherein the first wavelength comprises a first plurality of wavelengths from 200 nm to 280 nm.
5 . The purification system of claim 4 wherein the second wavelength comprises a second plurality of wavelengths at or below 500 nm.
6 . The purification system of claim 4 wherein the second wavelength comprises a second plurality of wavelengths at or below 387 nm.
7 . The purification system of claim 1 wherein the photocatalyst comprises titanium dioxide.
8 . The purification system of claim 1 wherein the photocatalyst comprises titanium dioxide and zinc oxide.
9 . The purification system of claim 1 wherein the baffles comprise an opening on one end.
10 . The purification system of claim 1 wherein the baffles comprise randomly spaced openings therethrough.
11 . The purification system of claim 1 wherein the reaction chamber comprises a mesh disposed therein.
12 . A light fixture comprising:
a frame or a structure;
a purification system of claim 1 coupled to the frame or the structure.
13 . The light fixture of claim 12 wherein the housing is a replaceable structure that is removably coupled to the frame or the structure.
14 . The light fixture of claim 12 further comprising a first deflector removably coupled to the frame or the structure.
15 . The light fixture of claim 12 further comprising a second deflector removably coupled to the frame or the structure, said fan and said reaction chamber disposed between the first deflector and the second deflector.
16 . A mobile platform comprising:
a base; and
the purification system of claim 1 coupled to the base.
17 . The mobile platform of claim 16 further comprising a humidifier coupled to the base.
18 . The mobile platform of claim 16 wherein the mobile platform is autonomous.
19 . The mobile platform of claim 16 wherein the surface, the light source and the fan are disposed in the reaction chamber.
20 . The mobile platform of claim 16 wherein the reaction chamber comprises an air outlet having a filter disposed adjacent thereto.
21 . A purification system comprising:
a housing having a lateral direction and a longitudinal direction;
a reaction chamber coupled to the housing comprising an inlet and an outlet;
a sensor coupled within the reaction chamber;
a fan coupled to the inlet of the reaction chamber communicating air through the reaction chamber to the outlet;
a dose control circuit board coupled to the outlet, said dose control circuit board comprising light sources having a first wavelength directed at air passing through the reaction chamber, said dose control circuit board comprising passages therethrough;
a plurality of baffles each comprising a parabolic portion having a curved surface with a photocatalyst;
the reaction chamber comprising a plurality of flow cavities extending across the reaction chamber in the lateral direction defined by the plurality of baffles disposed within the reaction chamber;
a fan coupled to the reaction chamber communicating air through the reaction chamber and the flow cavities therein;
a plurality of light sources, each light source associated with a respective one of the plurality of baffles so that each light source is positioned in each flow cavity at an intersection of the respective baffle and the housing having a first wavelength and each light source generating generate light directed at the surface of the parabolic portion having the photocatalyst so that light reflected from the parabolic portion is directed in a parallel direction within the flow cavities and laterally within the flow cavities and at air passing laterally through the flow cavities in a direction of the air within the flow cavities; and
a controller programmed to control a fan speed based on a sensor signal from the sensor within the reaction chamber to control a dose of light from the light.
22 . The purification system of claim 21 wherein the sensor comprise a temperature sensor and the sensor signal comprise a temperature signal.
23 . The purification system of claim 21 wherein the sensor comprise a pressure sensor and the sensor signal comprise a pressure signal.
24 . The purification system of claim 21 wherein the sensor comprise a flow sensor and the sensor signal comprise a flow signal.
25 . The purification system of claim 21 wherein the sensor comprises a temperature sensor and a flow sensor and the sensor signal comprises a temperature signal and a flow signal.
26 . The purification system of claim 21 wherein the passages comprise thermal vias.
27 . The purification system of claim 21 wherein the passages comprise openings coupled to a door and further comprising a controller programmed to control a damper actuator coupled to the door based on a sensor signal from a sensor within the reaction chamber.