DESC:CROSS REFERENCE TO RELATED APPLICATION
This application is based on and derives the benefit of Indian Provisional Application 202121000998 filed on 08/01/2021, the contents of which are incorporated herein by reference

TECHNICAL FIELD
[001] The embodiments herein generally relate to disinfection systems in healthcare centers and more particularly, to a system and a method for filtering, disinfecting and revitalizing indoor air.

BACKGROUND
[002] As is well known, a ward refers to a room where patients live in healthcare centers such as hospitals and nursing homes. Disease causing airborne bacteria, virus and aerosols in the hospital ward are more, and the chances of cross infection of diseases from infected patients to the healthcare providers is high thereby posing a major threat to the lives of healthcare providers. The need to safeguard the practicing healthcare providers becomes importance in today’s scenario of COVID pandemic. Sterilization (disinfection) is the most important safety operation performed in the hospital ward to reduce the presence of microorganisms in the hospital ward. Most of the disinfection methods in the hospital ward involve spraying sterilization water, which has many disadvantages and is troublesome to operate. For example, chlorine-containing disinfectant can kill part of bacteria and viruses left on the ground, tables and chairs and the like. However, this disinfection method cannot effectively kill bacteria and viruses in the air and on the other hand, the composition also generates pungent odor, and the patient with weak body is subjected to frequent headache or respiratory diseases, which is not favorable for the recovery of the patient.
[003] Other disinfections methods involve ultraviolet sterilization and disinfection which uses ultraviolet rays with proper wavelength to destroy the molecular structure of deoxyribonucleic acid or ribonucleic acid in microbial organism cells, so that growth cell death and regeneration cell death are caused, and the sterilization and disinfection effect is achieved. Usually, the ultraviolet sterilizer mostly adopts a single mode of fixed manual opening operation, where operators need to manually open without any protective measures under general conditions, the operators are easily harmed by the ultraviolet rays, and the eyes of the operators are greatly damaged. Further, the ultraviolet sterilizer mostly adopts a mode of fixed position single direction irradiation for sterilization and disinfection and has the defect of incomplete irradiation surface and cannot achieve the comprehensive sterilization and disinfection function of medical ultraviolet rays, and has a plurality of defects for indoor sterilization and disinfection. The most common UV emitters are mercury-vapor lamps and xenon lamps. Such lamps emit a very wide range of UV wavelengths and the vast majority of the emitted wavelengths (an associated power) have no effect on killing microorganisms. Such emitted wavelengths waste energy and can be harmful to humans over long exposure periods. Such lamps also need a high voltage power supply, which can create safety issues.
[004] Some disinfections methods utilize an ozone generator in the hospital ward for the destruction of airborne microbes. Ozone is not an effective biocide for airborne microbes except at extremely high and unsafe levels, for example, more than 3,000 parts per billion (ppb). As a result, ozone generators cannot destroy airborne microbes or pathogenic microorganisms effectively to achieve any benefits to occupant’s health. If these devices accidentally generate excessive levels of ozone, it will be detrimental to occupant’s health. For example, when the ozone is introduced in a relatively closed environment may reach a certain concentration which in turn damages the human body.
[005] Therefore, there exists a need for a system and a method for filtering, disinfecting and revitalizing the indoor air, which obviates the aforementioned drawbacks.

OBJECTS
[006] The principal object of embodiments herein is to provide a system for filtering, disinfecting and revitalizing the indoor air.
[007] Another object of embodiments herein is to provide a method for filtering, disinfecting and revitalizing the indoor air.
[008] Another object of embodiments herein is to provide the system for effectively filtering, disinfecting and revitalizing the indoor air through continuous and forced circulation of air in a closed loop manner.
[009] Another object of embodiments herein is to provide the system for filtering, disinfecting and revitalizing the indoor air, which kills the microbes and control the microbial activity in the user space.
[0010] Another object of embodiments herein is to provide a system for filtering, disinfecting and revitalizing the indoor air, which is ergonomic, efficient and reliable.
[0011] Another object of embodiments herein is to provide a system for filtering, disinfecting and revitalizing the indoor air, which prevents the spread of infectious diseases thereby saving the lives of healthcare providers.
[0012] Another object of embodiments herein is to provide a system for filtering, disinfecting and revitalizing the indoor air, which would remove the moisture/ humidity in the aerosol, oxidizes the organic contents, disinfect the infectious microorganisms and removes the bad odor.
[0013] Another object of embodiments herein is to provide a seven stage air treatment system for effectively filtering, disinfecting and revitalizing indoor air.
[0014] These and other objects of embodiments herein will be better appreciated and understood when considered in conjunction with following description and accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
[0015] The embodiments are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0016] Fig. 1 illustrates a system for filtering, disinfecting and revitalizing indoor air, according to embodiments as disclosed herein; and
[0017] Fig. 2 depicts a flowchart indicating a method for filtering, disinfecting and revitalizing the indoor air, according to embodiments as disclosed herein.

DETAILED DESCRIPTION
[0018] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0019] The embodiments herein achieve a system and a method for filtering, disinfecting and revitalizing the indoor air. Further, embodiments herein achieve the system for effectively filtering, disinfecting and revitalizing the indoor air through continuous and forced circulation of air in a closed loop manner. Referring now to the drawings Fig. 1 to fig. 2, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0020] Fig. 1 illustrates a system (100) for filtering, disinfecting and revitalizing the indoor air (A), according to embodiments as disclosed herein. In an embodiment, the system (100) includes a main housing (101), a duct (102), an ultraviolet C (UVC) light source (104), (hereinafter called as UVC light source (104)), a pre-filter (106), a moisture absorbent filter (108), a photocatalytic oxidizer (110), an ultraviolet sterilizer (112), a high efficiency particulate air filter (114), (hereinafter called as HEPA filter (114)), a bipolar plasma ionizer (116), an air circulating device (117), a speed control member (118), an indicating module (120), a manual operated control switch (122) and a plurality of caster wheels (124). For the purpose of this description and ease of understanding, the system (100) is explained herein with below reference to filtering, disinfecting and revitalizing the indoor air which is inhaled by the healthcare provider(s) in healthcare centers. However, it is also within the scope of the invention to any one of add new air treatment device(s) or remove any one or more air treatment devices (106-116) from the air treatment system (100), for practice and/or use for filtering, disinfecting and revitalizing the indoor air in industries, research centers, laboratories, private and public installations, commercial places, non-commercial places or any other places, where filtering, disinfecting and revitalizing of indoor air is required, without otherwise deterring the intended function of the air treatment system (100) as can be deduced from the description and corresponding drawings. The UVC light source (104), the pre-filter (106), the moisture absorbent filter (108), the photocatalytic oxidizer (110), the ultraviolet sterilizer (112), the HEPA filter (114) and the bipolar plasma ionizer (116) are also called as air treatment devices.
[0021] The main housing (101) is adapted to house/accommodate the pre-filter (106), the moisture absorbent filter (108), the photocatalytic oxidizer (110), the ultraviolet sterilizer (112), the high efficiency particulate air filter (114), the bipolar plasma ionizer (116) and the air circulating device (117). The main housing (101) can also be called as container or enclosure or cabinet. The housing (101) includes at least one air inlet (101A) and at least one air outlet (101B). The air inlet (101A) of the main housing (101) is adapted to facilitate entry of indoor air (A) from the duct (102) to the main housing (101). The air outlet (101B) of the main housing (101) is adapted to facilitate exit/ vent filtered, disinfected and revitalized indoor air (A) from the main housing (101) to the indoor room.
[0022] The duct (102) is adapted to allow the suctioned indoor air (A) carrying microbes flow to the main housing (101). The duct (102) includes an air inlet (102A) and an air outlet (102B). The air inlet (102A) of the duct (102) is adapted to facilitate entry of microbial indoor air (A) into said duct (102). The air inlet (102A) of the duct (102) is the suction point of indoor air (A) carrying microbes. The air inlet (102A) of the duct (102) is spaced away from the main housing (101). The air outlet (102B) of the duct (102) is adapted to facilitate exit of indoor air (A) from the duct (102) to the air inlet (101A) of the housing (101). The air inlet (102A) of the duct (102) is parallel to the air outlet (102B) of the duct (102). In one embodiment, the duct (102) is a stationary duct. In another embodiment, the duct (102) is one of a telescopic duct, and an extendable and retractable duct. The duct (102) is a U-shaped duct. It is also within the scope of the invention to provide the duct (102) in any other shape without otherwise deterring the intended function of the duct (102) as can be deduced from the description and corresponding drawings.
[0023] The UVC light source (104) is adapted to disinfect the indoor air (A) carrying microbes by directing UVC light ((L), (as shown in fig. 1)) onto the indoor air (A) carrying microbes that is flowing (suctioned) into the duct (102). The disinfected indoor air (A) flows from the duct (102) to the pre-filter (106) located in the main housing (101). The UVC light source (104) is located in an indoor air intake line of the duct (102) in which pre-disinfection of indoor air occurs before the circulation of disinfected indoor air to the pre-filter (106) located in the main housing (101). For example, the UVC light source (104) is adapted to be connected to the duct (102) at one of the air inlet (102A) or away from the air inlet (102A) of the duct (102). The UVC light source (104) includes a UVC light housing (104H) and at least one UVC light emitter (104L), (as shown in fig. 1). The UVC light emitter (104L) is also called as UVC lamp. In one embodiment, the UVC light source (104) is stationary. In another embodiment, the UVC light source (104) is adjustable in which the UVC light housing (104H) is adapted to be one of linearly or angularly adjustable with respect to the air inlet (102A) of the duct (102). The integrated unique wavelength of the UVC light ((L),(as shown in fig. 1)) emitted by the UVC light emitter (104L) at the suction point of indoor air (A) can be operated safely during the operation itself that will kill the micro-organisms present in the indoor air (A) without affecting the occupant in the room. In one embodiment, the UVC light source (104) is facing in the direction of entry of indoor air (A) into the duct (102). In another embodiment, the UVC light source (104) is facing an inner portion of the duct (102). In another embodiment, the UVC light source (104) is located inside the duct (102). In one embodiment, the UVC light source (104) is operated by the manual operated control switch (122) while operating the air circulation device (117) by the manual operated control switch (122). In another embodiment, the ultraviolet (UVC) light source (104) is operated by a controller unit (not shown), ((electronic controller unit, (ECU)). The duty cycle of the UVC light source (104) is controlled by the controller unit (not shown) or the manual operated control switch (122). The ultraviolet C (UVC) light source (104) is spaced away from the main housing (101).
[0024] The pre-filter (106) is adapted to remove the suspended particles, dust or any other foreign particles in the indoor air (A) which flows therethrough. The pre-filter (106) is located inside the main housing (101).
[0025] The moisture absorbent filter (108) is adapted to absorb the moisture or humidity in the indoor air (A)/aerosol which flows therethrough. The moisture absorbent filter (108) is located inside the main housing (101) and is positioned below the pre-filter (106). In an embodiment, the moisture absorbent filter (108) is at least an activated charcoal medium. However, it is also within the scope of the invention to provide any other moisture absorbing medium in place of the activated charcoal medium without otherwise deterring the intended function of the moisture absorbent filter (108) as can be deduced from the description and corresponding drawings.
[0026] The photocatalytic oxidizer (110) is adapted to oxidize the organic contents and volatile organic compounds (VOC’s) in the indoor air (A) which flows therethrough thereby purifying indoor air and reducing the bad odor. The photocatalytic oxidizer (110) is located inside the main housing (101) and is positioned below the moisture absorbent filter (108). In one embodiment, the photocatalytic oxidizer (110) is operated by the manual operated control switch (122) while operating the air circulation device (117) by the manual operated control switch (122). In another embodiment, the photocatalytic oxidizer (110) is operated by the controller unit (not shown), ((electronic controller unit, (ECU)). The duty cycle of the photocatalytic oxidizer (110) is controlled by the controller unit (not shown) or the manual operated control switch (122).
[0027] The ultraviolet sterilizer (112) is adapted to disinfect the indoor air (A) which flows therethrough. The ultraviolet sterilizer (112) includes an ultraviolet C (UVC) light emitter (not shown), (also called as UVC lamp) adapted to emit UVC light onto the indoor air (A) which flow therethrough. The UVC sterilizer (112) is facing in a direction towards or opposite with respect to indoor air (A) flow. The ultraviolet sterilizer (112) is located inside the main housing (101) and is positioned below the photocatalytic oxidizer (110). In one embodiment, the ultraviolet sterilizer (112) is operated by the manual operated control switch (122) while operating the air circulation device (117) by the manual operated control switch (122). In another embodiment, the ultraviolet sterilizer (112) is operated by the controller unit (not shown), ((electronic controller unit, (ECU)). The duty cycle of the ultraviolet sterilizer (112) is controlled by the controller unit (not shown) or the manual operated control switch (122).
[0028] The HEPA filter (114) is adapted to remove the fine particulates in the indoor air (A) which flows therethrough. The HEPA filter (114) is located inside the main housing (101) and is positioned below the ultraviolet sterilizer (112).
[0029] The bipolar plasma ionizer (116) is adapted to emit millions of ions in an ionizing chamber (not shown) defined in the main housing (101) thereby allowing mixing of the ions with the filtered and disinfected indoor air (A) which in turn would assist in reducing the aerial microbial count thereby minimizing the occupant’s health hazard. The bi-polar ionizer (116) is located in the ionizing chamber defined in the main housing (101). The bipolar plasma ionizer (114) is a high density bipolar plasma ionizer. In one embodiment, the bipolar plasma ionizer (114) is operated by the manual operated control switch (122) while operating the air circulation device (117) by the manual operated control switch (122). In another embodiment, the bipolar plasma ionizer (114) is operated by a controller unit (not shown), ((electronic controller unit, (ECU)). The duty cycle of the bipolar plasma ionizer (114) is controlled by the controller unit (not shown) or the manual operated control switch (122).
[0030] The pre-filter (106), the moisture absorbent filter (108), the photocatalytic oxidizer (110), the ultraviolet sterilizer (112) and the HEPA filter (114) is positioned inside the main housing (101) in a layer by layer configuration. The pre-filter (106), the moisture absorbent filter (108), the photocatalytic oxidizer (110), the ultraviolet sterilizer (112) and the (HEPA) filter (114), is parallel with respect to each other. It is also within the scope of the invention to change the positions of the air treatment devices (106-114) within the housing (101). Further, it is also within the scope of the invention to add alternate or other air treatment devices in the main housing (101) or remove one or more of the disclosed air treatment devices (106-116) from the air treatment system (100).
[0031] The air circulating device (117) adapted to circulate indoor air (A) received by the air inlet (102A) of the duct (102) to the pre-filter (106), the moisture absorbent filter (108), the photocatalytic oxidizer (110), the ultraviolet sterilizer (112) and the HEPA filter (114) located in the main housing (101) to facilitate filtering and disinfecting of indoor air (A). Further, the air circulating device (117) is adapted to circulate the filtered and disinfected air (A) to the ionizing chamber (not shown) of the main housing (101) in which the bi-polar ionizer (116) is adapted to emit ions to the ionizing chamber for allowing mixing of ions with the filtered and disinfected indoor air (A) in ionizing chamber thereby revitalizing the filtered and disinfected indoor air (A). The filtered, disinfected and revitalized indoor air (A) is vented to indoor room though the air outlet (101B) of said main housing (101). The air circulating device (117) includes a brushless direct current (BLDC) motor for circulating indoor air (A) carrying microbes from the indoor room to the main housing (101) via the duct (102), and for circulating the filtered, disinfected and revitalized indoor air (A) from the main housing (101) to the indoor room. For the purpose of this description and ease of understanding, the air circulating device (117) is considered to be an air suctioning device such as suction motor, suction fan and suction blower.
[0032] The speed control member (118) is adapted to change operating speed of the air circulating device (117) thereby changing the suctioning degree of indoor air into the duct (102). For example, the speed control member (118) is adapted to vary electric current supply to the air circulating device (117) to change operating speed of the air circulating device (117) thereby changing the suctioning degree of indoor air into the duct (102). The speed control member (118) is in communication with the air circulating device (117). For example, the speed control member (118) is one of a knob, switch(s), lever(s) and button(s).
[0033] The indicating module (120) adapted to indicate at least one of air quality index, air sanitization status, air sanitization level., operating speed of the air circulating device (117), operating parameters of the air treatment devices (104-116) and parameters relevant to filtering, disinfection and revitalizing indoor air (A). The indicating module (120) is at least one of a display unit, an audio unit, a visual-audio unit and a user interface unit.
[0034] The manual operated control switch (122) is adapted to operate the air circulating device (117), the UVC light source (104), the photocatalytic oxidizer (110), ultraviolet sterilizer (112) and the bipolar ionizer (116) for switching ON or switching OFF electric current supply to the air circulating device (117), the UVC light source (104), the photocatalytic oxidizer (110), ultraviolet sterilizer (112) and the bipolar ionizer (116). For example, the manual operated control switch (124) is a foot operated pedal switch. In another example, the manual operated control switch (124) is a hand operated switch such as but not limited to a lever and a button.
[0035] Further, in alternate embodiment, the system (100) includes a controller unit (not shown) and a sensor module (not shown) to replace the manual operated control switch (122) thereby automating the air treatment process. The controller unit (not shown) is in electrical and/or electronic communication with the air circulation device (117), the UVC light source (104), the photocatalytic oxidizer (110), ultraviolet sterilizer (112) and the bipolar ionizer (116). The controller unit (not shown) is in communication with the sensor module and the indicating module (120). The sensor module is adapted to monitor and communicate at least one sensory information to the controller unit, where the sensory information is a parameter relevant to at least one of filtering, disinfecting and revitalizing indoor air (A). The sensor module includes but not limited to air quality sensor, motion sensor, air sanitization level monitoring sensor and speed sensor, where the speed sensor monitors operational speed of the air circulation device (117). The controller unit is adapted to operate the air circulating device (117), the UVC light source (104), the photocatalytic oxidizer (110), ultraviolet sterilizer (112) and the bipolar ionizer (116) based on sensory information from the sensor module. The controller unit is adapted to change rotational speed of the air circulating device (117) based on the sensory information from the sensor module.
[0036] The plurality of castor wheels (124) is adapted to assist the user in easily moving the air treatment system ((100), (machine)) from one place to another place. The plurality of castor wheels (124) is connected at all corners of a bottom portion of the main housing (101). Each castor wheel (124) is provided with a locking member (no shown) which is adapted to be moved between one of a locked position and an unlocked position. In the locked position, the locking member is adapted lock the castor wheel (124) to restrict a movement of the air treatment system ((100), (machine)). In the unlocked position, the locking member is adapted unlock the castor wheel (124) to allow a movement of the castor wheel (124).
[0037] The working of the air treatment system (100) is as follows. When the air circulating device (117) is operated by one of the manual operated control switch (122) and the controller unit, the microbial indoor air (A) is suctioned (drawn) into the air inlet (102A) of the duct (102) by the air circulating device (117). When the microbial indoor air (A) is exposed to UV-C light (L) emitted by the UVC light source (104) at the air inlet (102A) of the duct (102), the microbial indoor air (A) gets disinfected. Thereafter, the air circulating device (117) circulates the disinfected indoor air (A) from the duct (102) to the air inlet (101A) of the main housing (101). Thereafter, the air circulating device (117) circulates this disinfected indoor air (A) from the air inlet (101A) of the main housing (101) to the air treatment devices (106-114) located inside the main housing (101) thereby facilitating filtering and further disinfection of indoor air (A). Thereafter, air circulating device (117) circulates the filtered and disinfected indoor air (A) to the ionizing chamber in which the bipolar ionizer (116) is adapted to emit ions to the ionizing chamber for allowing mixing of ions with the filtered and disinfected indoor air (A) in ionizing chamber thereby revitalizing the filtered and disinfected indoor air (A). Thereafter, the air outlet (101B) of the main housing (101) is adapted to vent the filtered, disinfected and revitalized indoor air (A) to the indoor room. The aforementioned process of filtering, disinfection and revitalization of indoor air repeats by continuous and forced circulation cycle of indoor air in a closed loop manner thereby eliminating/killing the microbes present in the indoor air (A) almost completely (99+ %). Thus, the indoor air remains disinfected for longer duration of the time.
[0038] Fig. 2 depicts a flowchart indicating a method (200) for filtering, disinfecting and revitalizing the indoor air, according to embodiments as disclosed herein. For the purpose of this description and ease of understanding, the method (200) is explained herein below with reference to filtering, disinfecting and revitalizing the indoor air which is inhaled by the healthcare provider(s) in healthcare centers. However, it is also within the scope of this invention to practice/implement the entire steps of the method (200) in a same manner or in a different manner or with omission of at least one step to the method (200) or with any addition of at least one step to the method (200) for filtering, disinfecting and revitalizing the indoor air in industries, research centers, private and public installations, laboratories, commercial places, non-commercial places or any other places, where filtering, disinfecting and revitalizing of indoor air is required, without otherwise deterring the intended function of the method (200) as can be deduced from the description and corresponding drawings.
[0039] At step (202), the method (200) includes drawing (suctioning), by an air circulating device (117), microbial indoor air (A) into an air inlet (102A) of a duct (102) on activation of the air circulating device (117).
[0040] At step (204), the method (200) includes directing by, at least one ultraviolet C (UVC) light source (104), ultraviolet C (UVC) light (L) onto the microbial indoor air (A) thereby disinfecting the indoor air (A) that is drawn (suctioned) into the duct (102).
[0041] At step (206) circulating, by the air circulating device (117), the disinfected indoor air (A) from the duct (102) to an air inlet (101A) of a main housing (101).
[0042] At step (208), the method (200) includes, filtering and disinfecting indoor air (A) by circulating, by the air circulating device (114), the disinfected indoor air (A) flow to a pre-filter (106), a moisture absorbent filter (108), a photocatalytic oxidizer (110), a ultraviolet (UV) sterilizer (112) and a HEPA filter (114), each of which is located inside the main housing (101).
[0043] At step (210), the method (200) includes, circulating, by the air circulating device (117), the filtered and disinfected indoor air (A) flow to an air ionizing chamber defined in the main housing (101).
[0044] At step (212), the method (200) includes revitalizing the filtered and disinfected indoor air (A) by a bi-polar ionizer (118) located in the air ionizing chamber of the main housing (101), by emitting, by the bi-polar ionizer (118), ions in the air ionizing chamber of the main housing (101), and allowing mixing of ions with the filtered and disinfected indoor air (A).
[0045] At step (214) the method (200) includes, venting, by at least one air outlet (101B) defined in the main housing (101), filtered, disinfected and revitalized indoor air (A) flow to the indoor room.
[0046] At step (216), the method (200) includes, retaining disinfected indoor air (A) in the indoor room for longer time period by repeating method step (202) to method step (214).
[0047] Further, the method (200) includes, operating the air circulating device (117), the UVC light source (104), the photocatalytic oxidizer (110), ultraviolet sterilizer (112) and the bipolar ionizer (116) by a manual operated control switch (122) for at least one of switching ON or switching OFF electric current supply to the air circulating device (117), the UVC light source (104), the photocatalytic oxidizer (110), ultraviolet sterilizer (112) and the bipolar ionizer (116).
[0048] Further, the method (200) includes changing, by a speed control member (118), rotational speed of the air circulating device (117) thereby changing the suctioning degree of indoor air into the duct (102).
[0049] Further, the method (200) includes, monitoring and communicating, by a sensor module, at least one sensory information to a controller unit, where the sensory information is a parameter relevant to at least one of filtering, disinfecting and revitalizing indoor air (A).
[0050] Furthermore, the method (200) includes operating the air circulating device (117), the UVC light source (104), the UV sterilizer (112) the photocatalytic oxidizer (110) and the bipolar ionizer (116), by the controller unit, based on inputs sent by the sensor module to the controller unit.
[0051] Still, the method (200) includes, indicating, by an indicating module, at least one of air quality index, air sanitization status, air sanitization level, operating speed of the air circulating device (117), operating parameters of the air treatment devices (104-116) and parameters relevant to filtering, disinfection and revitalizing indoor air (A) based on instructions/signals sent by the controller unit to the indicating module.
[0052] The technical advantages of the system (100) for filtering, disinfecting and revitalizing indoor air (A) are as follows. The system is used for filtering, disinfecting and revitalizing the indoor air through continuous and forced circulation of disinfected indoor air in a closed loop manner. The system includes seven stage air treatments for effectively filtering, disinfecting and revitalizing indoor air. The air treatment system kills the microbes and controls the microbial activity in the user space. The air treatment system is ergonomic, efficient and reliable. The air treatment system prevents the spread of infectious diseases thereby saving the lives of healthcare providers. The air treatment system is used to remove the moisture/ humidity in the aerosol, oxidizes the organic contents, disinfects the infectious microorganisms and removes the bad odor.
[0053] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modifications within the spirit and scope of the embodiments as described herein.
,CLAIMS:We claim:
1. A system (100) for filtering, disinfecting and revitalizing indoor air (A), said system (100) comprising:
a main housing (101) having at least one air inlet (101A) and at least one air outlet (101B);
a duct (102) having an air inlet (102A) and an air outlet (102B), wherein said air inlet (102A) is adapted to facilitate entry of microbial indoor air (A) into said duct (102), wherein said air outlet (102B) is adapted to facilitate exit of indoor air (A) from said duct (102) to said air inlet (101A) of said main housing (101);
at least one ultraviolet C (UVC) light source (104) adapted to be connected to said duct (102) at one of said air inlet (102A) or away from said air inlet (102A) of said duct (102);
a pre-filter (106) adapted to be located inside said main housing (101);
a photocatalytic oxidizer (110) adapted to be located inside said main housing (101);
an ultraviolet sterilizer (112) adapted to be located inside said main housing (101);
a high-efficiency particulate absorbing (HEPA) filter (114) adapted to be located inside said main housing (101); and
an air circulating device (117) adapted to circulate indoor air (A) received by said air inlet (102A) of said duct (102) to said pre-filter (106), said moisture absorbent filter (108) , said photocatalytic oxidizer (110), said ultraviolet sterilizer (112) and said HEPA filter (114) to facilitate filtering and disinfecting of indoor air (A).

2. The system (100) as claimed in claim 1, wherein said system (100) includes,
a moisture absorbent filter (108) adapted to be located inside said main housing (101); and
a bi-polar ionizer (116) adapted to be located in an ionizing chamber defined in said main housing (101),
wherein
said air circulating device (117) is adapted to circulate the filtered and disinfected air (A) to said ionizing chamber of said main housing (101);
said bi-polar ionizer (116) is adapted to emit ions for mixing of ions with the filtered and disinfected indoor air (A) in said ionizing chamber thereby revitalizing the filtered and disinfected indoor air (A); and
said air outlet (101B) of said main housing (101) is adapted to vent the filtered, disinfected and revitalized indoor air (A) back to indoor room.

3. The system (100) as claimed in claim 2, wherein said moisture absorbent filter (108) is adapted to be positioned below said pre-filter (106);
said photocatalytic oxidizer (110) is positioned below said moisture absorbent filter (108);
said ultraviolet sterilizer (112) is positioned below said photocatalytic oxidizer (110);
said HEPA filter (114) is positioned below said ultraviolet sterilizer (112);
said air circulating device (114) is located inside said main housing (101) and is positioned below said HEPA filter (114);
said pre-filter (106), said moisture absorbent filter (108), said photocatalytic oxidizer (110), said ultraviolet sterilizer (112) and said HEPA filter (114) is positioned inside said main housing (101) in a layer by layer configuration;
said pre-filter (106), said moisture absorbent filter (108), said photocatalytic oxidizer (110), said ultraviolet sterilizer (112) and said HEPA filter (114), is parallel with respect to each other;
said pre-filter (106) is adapted to filter the indoor air (A) which flows therethrough;
said UVC light source (104) is adapted to disinfect the microbial indoor air (A) that is flowing (suctioned) into said duct (102);
said moisture absorbent filter (108) is adapted to absorb the moisture or humidity in the indoor air (A)/aerosol which flows therethrough;
said photocatalytic oxidizer (110) is adapted to oxidize the organic contents and volatile organic compounds (VOC’s) in the indoor air (A) which flows therethrough thereby purifying indoor air and reducing the bad odor;
said ultraviolet sterilizer (112) is adapted to disinfect the indoor air (A) which flows therethrough; and
said HEPA filter (114) is adapted to remove the fine particulates in the indoor air (A) which flows therethrough.

4. The system (100) as claimed in claim 1, wherein said system (100) includes,
a speed control member (118) adapted to change rotational speed of said air circulating device (117) thereby changing the suctioning degree of indoor air into said duct (102),
wherein
said air circulating device (114) is one of a suction motor, suction fan and a suction blower;
said air inlet (102A) of said duct (102) is spaced away from said main housing (101);
said ultraviolet C (UVC) light source (104) is spaced away from said main housing (101);
said duct (102) is a U-shaped duct; and
said air inlet (102A) of said duct (102) is parallel to said air outlet (102B) of said duct (102).
5. The system (100) as claimed in claim 1, wherein said system (100) includes an indicating module (120) adapted to indicate at least one of air quality index, air sanitization status, air sanitization level, operating speed of said air circulating device (117), operating parameters of said air treatment devices (104-116) and parameters relevant to filtering, disinfection and revitalizing indoor air (A),
wherein
said indicating module (120) is at least one of a display unit, an audio unit, a visual-audio unit and a user interface unit.

6. The system (100) as claimed in claim 1, wherein said system (100) includes a manual operated control switch (122) adapted to operate said air circulating device (117), said UVC light source (104), said photocatalytic oxidizer (110), ultraviolet sterilizer (112) and said bipolar ionizer (116) to switch ON or switch OFF electric current supply to said air circulating device (117), said UVC light source (104), said photocatalytic oxidizer (110), said ultraviolet sterilizer (112) and said bipolar ionizer (116), wherein said manual operated control switch (124) is one of a foot operated pedal switch or hand operated switch.

7. The system (100) as claimed in claim 5, wherein said system (100) includes,
a controller unit; and
a sensor module adapted to monitor and communicate at least one sensory information to said controller unit, where said sensory information is a parameter relevant to at least one of filtering, disinfecting and revitalizing indoor air (A),
wherein
said controller unit is adapted to operate said air circulating device (117), said UVC light source (104), said photocatalytic oxidizer (110), said ultraviolet sterilizer (112) and said bipolar ionizer (116) based on sensory information from said sensor module; and
said controller unit is in communication with said indicating module (120);
said controller unit is adapted to change rotational speed of said air circulating device (117) thereby changing the suctioning degree of indoor air (A) into said duct (102) based on the sensory information from said sensor module.

8. A method (200) for filtering, disinfecting and revitalizing indoor air (A), said method (200) comprising:
drawing (202), by an air circulating device (117), microbial indoor air (A) into an air inlet (102A) of a duct (102) on activation of the air circulating device (117);
directing (204), by at least one ultraviolet C (UVC) light source (104), ultraviolet C (UVC) light (L) onto the microbial indoor air (A) thereby disinfecting the indoor air (A) that is drawn (suctioned) into the duct (102);
circulating (206), by the air circulating device (117), the disinfected indoor air (A) from the duct (102) to an air inlet (101A) of a main housing (101);
filtering and disinfecting (208) indoor air (A) by circulating, by the air circulating device (114), the disinfected indoor air (A) flow to a pre-filter (106), a moisture absorbent filter (108), a photocatalytic oxidizer (110), a ultraviolet (UV) sterilizer (112) and a HEPA filter (114), each of which is located inside the main housing (101);
circulating (210), by the air circulating device (117), the filtered and disinfected indoor air (A) flow to an air ionizing chamber defined in the main housing (101);
revitalizing (212) the filtered and disinfected indoor air (A) by a bi-polar ionizer (118) located in the air ionizing chamber of the main housing (101), by emitting, by the bi-polar ionizer (118), ions in the air ionizing chamber of the main housing (101), and allowing mixing of ions with the filtered and disinfected indoor air (A); and
venting (214), by at least one air outlet (101B) defined in the main housing (101), filtered, disinfected and revitalized indoor air (A) flow to indoor room.

9. The method (200) as claimed in claim 8, wherein said method (200) includes,
retaining (216) disinfected indoor air (A) in the indoor room by repeating said method step (202) to said method step (214);
operating the air circulating device (117), the UVC light source (104), the photocatalytic oxidizer (110), ultraviolet sterilizer (112) and the bipolar ionizer (116) by a manual operated control switch (122), for at least one of switching ON or switching OFF electric current supply to the air circulating device (117), the UVC light source (104), the photocatalytic oxidizer (110), ultraviolet sterilizer (112) and the bipolar ionizer (116); and
changing, by a speed control member (118), rotational speed of the air circulating device (117) thereby changing the suctioning degree of indoor air into the duct (102).

10. The method (200) as claimed in claim 8, wherein said method (200) includes,
monitoring and communicating, by a sensor module, at least one sensory information to a controller unit, where the sensory information is a parameter relevant to at least one of filtering, disinfecting and revitalizing indoor air (A);
operating the air circulating device (117), the UVC light source (104), the photocatalytic oxidizer (110), ultraviolet sterilizer (112) and the bipolar ionizer (116), by the controller unit based on inputs sent by the sensor module to the controller unit; and
indicating, by an indicating module, at least one of air quality index, air sanitization status, air sanitization level, operating speed of the air circulating device (117), operating parameters of the air treatment devices (104-116) and parameters relevant to filtering, disinfection and revitalizing indoor air (A) based on instructions/signals sent by the controller unit to the indicating module.