RU2776462C1 - Supply and recirculation unit and method for air purification with heating - Google Patents

Abstract

FIELD: air purification.

SUBSTANCE: present invention relates to supply and recirculation units and methods for air purification with heating, implemented using a supply-recirculation installation. The housing of the supply and recirculation unit is made with at least one hole for air intake from the room, at least one hole for air intake from the street and at least one hole for air outlet. Inside the housing, two coarse filters, two fine filters, a heater and a fan are sequentially located. Also, at least one temperature sensor is installed in the area of openings for air intake from the street and for air intake. The method implemented using a supply-recirculation unit consists of a stage of air intake from the street/from the room, passing it through at least two coarse filters, at least two fine filters and a heater. After that, the air is removed from the housing of the supply and recirculation unit. At the same time, based on the readings of temperature sensors, the air temperature is measured and the operation algorithm of the heater is adjusted.

EFFECT: invention provides air purification and heating.

17 cl, 4 dwg

Description

Technical field

[1] The present invention relates to indoor air handling units capable of both supplying fresh air to the room and recirculating the air in the room, while cleaning and heating the air. The filter unit of the room supply and recirculation unit provides cleaning from coarse and fine dust, bacteria, formaldehydes and odors.

State of the art

[2] In order to purify and / or heat the air in closed office and residential premises, various climatic equipment is often installed, such as air purifiers, air valves, air conditioners, etc. Each of these devices has its own set of functions. For example, air conditioners circulate indoor air and cool or heat it, air purifiers purify recirculated air, and air valves bring fresh air from outdoors into rooms. Room supply and recirculation units have the ability to both supply fresh air from the street into the room, purifying and heating it, and purify the recirculated air in the room.

[3] Air handling units are usually equipped with at least one outdoor air intake, at least one indoor air intake, and at least one indoor air outlet. Fans are installed in the case to ensure the movement of air from the intake hole to the air outlet hole through the filter unit and the heater. Most often, air filtering installations consist of at least one coarse filter and at least one fine filter.

[4] Utility model patent RU80923U1 (publ. 27.02.2009; IPC: F24F 7/00) describes a device for ventilating small rooms equipped with airtight windows. The supply ventilation device includes a fresh air supply channel located in the wall, an electric heater with overheating protection elements, an internal heat-insulated housing forming a channel for recirculating room air with a filter, a fan and a valve installed in it. When the valve is moved, the inlet channel is opened with simultaneous blocking of the recirculation channel. The device is additionally equipped with an air temperature sensor at the outlet to the room and an automatic control system with an electric drive that controls the valve position according to the current value of the temperature of the air supplied to the room. The device, by automatically changing the ratio of inflow and recirculating room air, prevents subcooling below the set value of the air supplied to the room in winter and overheating in summer. The electric heater, equipped with a manual power switch, allows you to increase the proportion of inflow in winter. The first disadvantage of this analog is that the electric heater for heating the supply air is placed before the filter unit. When the heater is placed before the filters, the heater becomes clogged with dust, which, when the heater is turned on, can begin to smoke. The second drawback is that the temperature measurement sensor is only at the outlet. In the present invention, it is placed at the inlet to adjust the fan speed and at the outlet to check whether the device has warmed up the air. Placing the sensor in front of the heater allows you to adjust the heating algorithm for the target air flow, which speeds up reaching the set temperature. The third disadvantage is that an electric heater is used as a heater. The disadvantage of electric heaters is that they dry the air if they are not equipped with additional humidifiers and / or ionizers. In the present invention, the use of a PTC heater is most preferred, as it is the safest. It cannot be heated above a certain temperature and does not contain open heating coils. Also in the present invention, it can be equipped with thermal fuses in order to make the device even more secure. Another drawback is that in the utility model described above, the damper can be located not only in the "recirculation" and "inflow" modes, but also in mixed mode, and the proportions of recirculation and supply air can be adjusted independently. Mixed mode has a number of limitations associated with different temperatures and humidity of air flows, in particular, under certain conditions, frost / snow will form on the damper element, and there is a possibility of air overflow past the filters.

[5] JP3940417B2 (publ. 07/04/2007; IPC: B01D 46/00; A61L 9/01; A61L 9/16; A61L 9/00; B01D 53/94) describes air conditioning equipment including a sirocco fan and filter block. The filter unit includes a deodorizing filter, a filter for removing organic substances having an aldehyde group, and an antibacterial/dust filter. The deodorizing filter contains a catalyst to remove carbon monoxide. The first disadvantage of this device is the lack of an inflow mode that provides fresh air to the room. The second disadvantage is the separation of the classic adsorption catalytic filter into two different filters: a deodorizing filter and an organic removal filter. This is redundant, because an activated carbon layer filter is sufficient to perform both functions. A third disadvantage is that in the above-described patent, the deodorizing layer also plays the role of a pre-filter. This significantly reduces the "lifetime" of the filter, because. we also get coarse dust, wool, small debris, etc., in connection with which it ceases to perform its main function - getting rid of odors - ahead of schedule. Therefore, it is much more economical to use a pre-filter so that everything previously listed settles on it, and the deodorizing filter performs its direct function. Another disadvantage is that the dust filter is also used as a bacteria trap, but it is not impregnated with antibacterial impregnation and is not made with an antibacterial layer.

[6] Utility model RU176378U1 (publ. 01/07/2018; IPC: F24F 7/00) describes a supply and cleaning ventilation unit, consisting of a housing with an opening for connecting the housing to an air duct and a coarse filter installed in the grooves between the opening and the rear housing wall and equipped with a handle for removing and cleaning and an air intake grille located in a plane perpendicular to the plane of the hole. Inside the housing there is a heating element installed in a plastic holder, bolted to the rear wall of the housing, heat-insulating material, an inflow valve. In the middle part of the housing, three fine filters are installed in series on guides. In the lower part of the housing, a fan is fixed on the bottom, equipped with a casing and connected to a power source. In the upper part of the housing there is a control unit containing a control board, which is electrically connected to the carbon dioxide sensor and the air dust sensor by means of loops. The fan ensures the supply of outside air through the opening or air from the room through the air intake grille and the removal of purified air through the air outlet grille into the room. The inflow valve is mounted on a movable pin on the back of the housing, it has two positions - open / closed, changed by an electric motor connected to the control board of the control unit, using a remote control, automatically or from external devices via Wi-Fi. The first disadvantage of this analog is that the electric heater for heating the supply air is placed before the filter unit. When the heater is placed before the filters, the heater becomes clogged with dust, which, when the heater is turned on, can begin to smoke. The second disadvantage is the presence of only the inflow mode and the absence of the air recirculation mode. Another disadvantage is that the analog has only one coarse filter and three fine filters. The present invention uses a more economical filter configuration consisting of two coarse filters and two fine filters. The fourth drawback is the absence of a temperature sensor that allows you to adjust the operation algorithm of the fan and heater, as well as determine whether the supply air is heated to the required temperature.

[7] US20160001212A1 (published 01/07/2016; IPC: B01D 46/00; B01D 46/46; B01D 46/44) describes an indoor air purifier that has a housing that includes an inlet for floor supply air, an inlet indoor air hole and outlet. The air mixing chamber inside the housing is in direct communication with the specified room air inlet and the specified floor duct inlet. The filter is located in the housing. A fan is disposed in said housing between the filter outlet and the filter outlet side. The air channel panel is located in the inlet area of the filter between the air mixing chamber and the filter. Various sensors can be used to control the temperature and prevent untreated air from escaping from the room air cleaner. An additional wall inlet can be placed in fluid communication with the air mixing chamber to provide a second source of outdoor air. The first disadvantage is that the analog does not have pre-filter or pre-filter filters, and therefore the main filter unit will become clogged with dust much faster, because. will collect on itself not only fine dust, but also large. The second disadvantage is the use of only HEPA filters of various filtration classes. HEPA filters do not purify the air from formaldehydes and odors, and therefore it is necessary to install additional adsorption-catalytic filters designed for these purposes in order to make cleaning more efficient and of high quality. The third disadvantage is that all temperature sensors are located only at the outlet of the device. Therefore, the device does not have inlet temperature sensors that ensure that the heating algorithm is adjusted to the target air flow, which accelerates reaching the set temperature.

[8] The closest analogue is the Breezer O2 device, produced by Tion Smart Microclimate joint-stock company, owned by the Tion group of companies (link to the device: https://tion.ru/product/breezer-tion-o2/). The Breezer Tion O2 is a compact ventilation unit designed to create a healthy, comfortable indoor climate by actively drawing fresh air into the building and filtering it. At the same time, air is cleaned from all types of pollution using a three-stage filtration system, fresh air is constantly and in the right amount supplied from the street to the room by a low-noise fan, if necessary, an air heating system with a climate control function is used. The device consists of a basic F7 filter, an air heating system, a high-efficiency HEPA H11 filter and an adsorption catalytic filter AK. The first disadvantage of this device is that the air heating system is placed before the fine filters. When the heater is placed before the fine filters, fine dust can get on the heater, which, when the heater is turned on, can start to smoke. The second drawback is that the analog uses one coarse filter of class F7. The present invention uses two coarse filters of different classes for deeper air purification. The third disadvantage is that the analog does not have antibacterial impregnation on the HEPA filter, and therefore it simply traps bacteria, but does not disinfect them on its surface.

The essence of the invention

[9] The objective of the present invention is to create and develop a supply and recirculation unit and a method for cleaning air with heating, ensuring the operation of the supply and recirculation unit in the modes of supply and recirculation by air purification, as well as its efficient and safe heating.

[10] This task is achieved due to such a technical result as providing effective air purification, including cleaning of coarse and fine dust, formaldehyde, odors and bacteria, with the provision of air heating controlled by temperature sensors. This is achieved, among other things, through:

• use of two stages of coarse purification and two stages of fine purification for air purification;

• placement of the heater after the air purification stages;

• the use of at least two temperature sensors located in the vicinity of the supply air intake and in the area of the air outlet;

• application of readings from at least two temperature sensors to correct the heater operation algorithm.

[11] The technical result is achieved by a supply and recirculation unit, including a housing in which at least one hole is made for air intake from the room, at least one hole for air intake from the street and at least one hole for air outlet, as well as at least two coarse filters, at least two fine filters, a heater and a fan are installed in series, and at least one temperature sensor is installed in the area of the air intake hole and in the area of the air outlet hole.

[12] At the same time, at least two coarse filters are needed to clean the air from coarse dust, wool and fine debris, and at least two fine filters are needed to clean the air from fine dust, volatile organic compounds (VOCs), odors and bacteria. The heater is required to heat the supply air to the desired temperature, and the fan is required to ensure air intake through the air intake hole and its wires through at least two coarse filters, at least two fine filters and a heater, followed by the removal of purified and heated air from housing of the air handling unit through the air outlet. At least one temperature sensor located in the area of the air intake opening is required to measure the supply air temperature and adjust the heater operation algorithm based on the temperature sensor readings. At least one air sensor located in the area of the air outlet is required to measure the temperature of the air exiting through the air outlet, to check whether the air is heated to the desired temperature, and also to subsequently adjust the heater operation algorithm.

[13] The fact that a pre-filter and/or a primary filter of class G1 to G4/G4 to F7 can be used as a coarse filter makes it possible to purify the air from coarse dust of different sizes, depending on the filtration class. The use of at least two coarse filters allows for a deeper primary air purification, so that the fine filters can last longer.

[14] The fact that the primary filter can be made with a capacity in the range of 1000-2000 mg, which is an increased filter capacity compared to the standard, allows the primary filter to remain usable longer.

[15] The use of a HEPA filter and/or an EPA filter and/or an adsorption catalytic filter and/or any combination of them as a fine filter may allow fine dust and/or formaldehyde and odors to be removed from the air, depending on the combination used. filters.

[16] That the HEPA filter and/or EPA filter can be made with an increased capacity and the adsorption catalytic filter can be made with a reduced capacity so that the ratio of the capacities of the HEPA filter and/or EPA filter and the adsorption catalytic filter is 5/1-12/1, allows you to increase the life of the HEPA filter and / or EPA filter without changing the air pressure drop in the filter unit. And the fact that the pressure drop remains unchanged allows you not to lose in the pressure of the air pumped by the fan, and therefore the operation of the fan does not lose efficiency.

[17] The fact that a filter of class H11 and higher can be used as a HEPA filter can trap 85% of the particles contained in the air.

[18] EPA filter class E11 and above can filter 85 to 99.5% of particles smaller than 0.06 microns.

[19] The fact that the HEPA filter can be impregnated with antibacterial impregnation also makes it possible to decontaminate the air, that is, clean it from bacteria.

[20] The implementation of dampers in the openings for air intake from the room and from the street can make it possible to implement separate modes of inflow and recirculation without air mixing.

[21] The bearings in the fan make it possible to reduce the level of noise emitted by the fan during operation, and the fact that the bearings are made of rubber-coated protective washers and / or high-slip grease is used makes the fan silent at low rotation frequency and barely audible at high rotation frequency.

[22] Also, the technical result is achieved by a heated air purification method, through which air is first admitted from the room and / or from the street through the air intake hole from the room and / or through the air intake hole from the street, respectively. Next, the air is sequentially passed through at least two coarse filters and through at least two fine filters. After that, the purified air is heated with a heater and the heated and purified air is brought into the room through the air outlet. At the same time, with the help of at least one temperature sensor located in the area of the air intake hole from the street, the temperature of the supply air is measured, and with the help of at least one temperature sensor located in the area of the air outlet hole, the temperature of the heated purified air is measured. entering the room, and adjust the heater operation algorithm based on the readings of at least one of the temperature sensors.

[23] At the same time, passing air through at least two coarse filters is necessary to clean the air from coarse dust, wool, hair and small debris, and passing air through at least two fine filters is necessary to clean the air from fine dust, formaldehyde, odors and bacteria. The heating of the purified air is necessary so that the supply air does not cool the air in the room, and the fact that it is located after the air purification stages prevents debris and dust from entering the heater, and therefore it cannot catch fire on it and start to smoke. Measurement of air temperature using at least one temperature sensor located in the area of the air intake opening is necessary to measure the supply air temperature and adjust the heater operation algorithm based on the temperature sensor readings, and air temperature measurement using at least one air sensor, located in the area of the air outlet hole, it is necessary to measure the temperature of the air leaving through the air outlet hole, to check whether the air is heated to the desired temperature, and also to subsequently adjust the heater operation algorithm.

[24] The fact that before the stage of air intake from the room and / or from the street, the set mode can be determined, namely whether the mode is set to “supply”, “recirculation” or “mixed”, and then open and / or close the corresponding damper and / or appropriate dampers installed in the corresponding air intake holes, allows you to organize air intake from the street and / or from the room, depending on the set operating mode of the air handling unit for subsequent cleaning and heating.

[25] Also, the device may not have a “mixed” mode, and only “inflow” and “recirculation” can be implemented.

[26] The fact that, at the stage of passing air through at least one coarse filter, air can be passed through a pre-filter and / or a primary filter of a class in the range from G1 to G4 / from G4 to F7, it is possible to purify the air from coarse dust of different sizes. , depending on the filtration class. The use of at least two coarse filters allows for a deeper primary air purification, so that the fine filters can last longer.

[27] The fact that, during the stage of passing air through at least two fine filters, the air can be passed through a HEPA filter and/or an EPA filter and/or an adsorption catalytic filter and/or through any combination thereof, allows air to be purified from fine dust and/or formaldehyde and odours, depending on the filter combination used.

Description of drawings

[28] FIG. 1 shows the air handling unit.

[29] FIG. 2A is a sectional view of the air handling unit showing airflow in "recirculation" mode (front view).

[30] FIG. 2B is a cross-sectional view of the air handling unit showing the air flow in the "inflow" mode (front view).

[31] FIG. 3A is a block diagram illustrating a heated air purification method.

Detailed description

[32] In the following detailed description of the implementation of the invention, numerous implementation details are provided to provide a clear understanding of the present invention. However, one skilled in the art will appreciate how the present invention can be used, both with and without these implementation details. In other cases, well-known methods, procedures and components are not described in detail so as not to obscure the features of the present invention.

[33] In addition, from the foregoing it is clear that the invention is not limited to the above implementation. Numerous possible modifications, alterations, variations, and substitutions that retain the spirit and form of the present invention will be apparent to those skilled in the art.

[34] FIG. 1 shows a supply and recirculation unit, in the body 1 of which there is at least one hole for air intake from room 2, at least one hole for air intake from the street 3 and at least one hole for air outlet into room 4. At the same time the first coarse filter 5, the second coarse filter 6, the first fine filter 7, the second fine filter 8, the heater 9 and the fan 10 are sequentially located in the housing. 4, temperature sensors 11 and 12 are made, respectively. On FIG. 1 shows the preferred location of the opening for air intake from room 2, the opening for air intake from the street 3 and the opening for air outlet to room 4, however, they can be located on any of the walls of the housing 1 of the supply and recirculation unit, if the sequence air passing through at least two coarse filters 5, 6, at least two fine filters 7, 8 and heater 9.

[35] Under the filters of "coarse cleaning" in the framework of this application, filters are accepted, which, in accordance with GOST R EN 779-2014, belong to classes G1-G4, as well as to classes F7-F9. "Fine" filters mean HEPA and EPA filters in accordance with GOST R EN 1822-1-2010, which are "high-performance filters", as well as adsorption-catalytic filters, disinfection filters and other filters that are designed to remove specific substances from the air .

[36] As coarse filters 5 and 6, a prefilter and/or a primary filter can be used. In this case, a primary filter of class G1 to G4/G4 to F7 can be used. Also, the capacity of the primary filter can be increased compared to the standard so that it lies in the range from 1000 to 2000 mg. This entails a longer use of the primary filter.

[37] The capacity of the filter in the framework of this application refers to the maximum mass of particles that the filter is able to collect on itself.

[38] As fine filters 7 and 8° can be used HEPA filter and/or EPA filter and/or adsorption catalytic filter, as well as any combination thereof. In this case, the first fine filter 7, for example, a HEPA filter or an EPA filter, can be made with an increased relative to the standard capacity, and the second fine filter 8, for example, an adsorption-catalytic filter, is made with a reduced relative to the standard capacity, so that the ratio of capacities the first fine filter 7 and the second fine filter 8 is 5/1-12/1. This makes it possible to increase the lifetime of the first fine filter 7, but at the same time to maintain the pressure drop between them. In this case, it is preferable to use a HEPA filter of class H11 or higher, and an EPA filter of class E11 or higher. Also, the HEPA filter and/or EPA filter can be impregnated with an antibacterial impregnation. This will allow not only to purify the air of fine dust, but also to disinfect it from bacteria and microbes.

[39] For quiet or noiseless operation of the air handling unit during operation, additional bearings can be installed in the fan 10. Also, rubberized protective washers can be additionally made in the bearings and/or high-slip grease can be additionally used, which make it possible to make the air handling unit operate silently at low fan 10 speeds and quiet at high speeds.

[40] In order for the air handling unit to be able to operate in the “supply”, “recirculation” and “mixed” modes, dampers that open and/or close depending on the set operating mode of the air handling unit.

[41] In FIG. 2A shows the air handling unit in front in section, operating in the "recirculation" mode. The air handling unit in the "recirculation" mode works as follows. The air from the room with the help of a fan 10 enters the supply and recirculation unit through the opening for air intake from the room 2. Further, the incoming air passes through the first coarse filter 5, the second coarse filter 6, the first fine filter 7 and the second fine filter 8. After that, the purified air leaves the air handling unit through the air outlet to the room 4. Before leaving the unit, the purified air can be heated using a heater 9. When the heating is turned on, the temperature sensor 12 measures the temperature of the outgoing air. And if the outgoing air is not warmed up to the desired temperature, then the heater operation algorithm 9 is corrected.

[42] In FIG. 2B shows the supply and recirculation unit from the side in section, operating in the "inflow" mode. The supply and recirculation unit in the "inflow" mode works as follows. Air from the street with the help of a fan 10 enters the supply and recirculation unit through the air intake from the street 3. At the same time, the temperature sensor 11 measures the temperature of the incoming air and corrects the operation algorithm of the heater 9. Further, the incoming air passes through the first coarse filter 5, the second coarse filter 6, the first fine filter 7 and the second fine filter 8. After that, the purified air is heated by the heater 9 and exits the air handling unit through the air outlet into the room 4. Before leaving the unit, temperature sensor 12 measures the temperature of the purified air. And if the outgoing air is not warmed up to the desired temperature, then the heater operation algorithm 9 is corrected.

[43] It is also possible to implement the device in which, in the "recirculation" mode, the air passes through all the filters, namely through the first and second coarse filters 5 and 6 and through the first and second fine filters 7 and 8. At the same time, as in the “supply” mode, the passing air avoids passing through the first coarse filter 5, but only passes through the second coarse filter 6 and the first and second fine filters 7 and 8. In this case, the supply air is drawn in through the air intake hole 2 from the street, located between the first 5 and second 6 coarse filters. The opposite case is also possible, when in the "recirculation" mode the air passes through three filters, and in the "inflow" mode - through four.

[44] The air handling unit in "mixed" mode operates according to the combination of the modes of operation described above and shown in FIG. 2A and FIG. 2B.

[45] In FIG. 3A is a block diagram illustrating the heated air purification method according to the present invention. First, air is let in from the room and / or from the street through the hole for air intake from the room 2 and / or the hole for air intake from the street 3. If the air is let in from the room, the air is conducted through at least two coarse filters 5 and 6 , at least two fine filters 7 and 8, heat the purified air with the help of a heater 9, after which the air is removed through the air outlet into the room 4. If air is let in from the street, the temperature of the supply air is first measured using a temperature sensor 11. Based on the data of the temperature sensor 11, the operation of the heater 9 is corrected. After that, the air is passed through at least two coarse filters 5 and 6, at least two fine filters 7 and 8, the purified air is heated using the heater 9 and removed purified and heated air into the room through the air outlet into the room 4. The temperature of the outgoing air is measured using a temperature sensor s 12. And if the air is not heated to the desired temperature, the heater 9 operation algorithm is re-corrected based on the readings of the temperature sensor 12.

[46] In a method for purifying air with heating, with an additional step of determining the on mode of the air handling unit and the step of adjusting dampers built into the air intake from the room 2 and into the air intake from the street 3. First, it is determined which mode is on. If the recirculation mode is on, check if the air intake from the street 3 is open, and if it is open, then close the air intake from the street 3. Check whether the air intake from the room 2 is open, and if closed, then open the hole for air intake from the room 2. After that, the steps described above are performed, corresponding to the "recirculation" mode. If the "supply" mode is on, first check whether the air intake hole from the street 3 is open, and if it is closed, then open the air intake hole from the street 3. Check whether the air intake hole from the room 2 is open, and if it is open, then close the hole for air intake from room 2. After that, the steps described above are performed, corresponding to the “inflow” mode. If the “mixed” mode is enabled, check whether the air intake hole from the street 3 is open, and if it is closed, then open the air intake hole from the street 3. Check whether the air intake hole from the room 2 is open, and in if it is closed, then open the hole for air intake from room 2. Then let in recirculation air through the hole for air intake from room 2 and supply air through the hole for air intake from the street 3. Measure the temperature of the incoming supply air using temperature sensor 11 and the operation of the heater 9 is corrected based on the readings of the temperature sensor 11. Then, with the help of a fan 10, air is passed through at least coarse filters 5 and 6, at least two fine filters 7 and 8, and the purified air is heated using a heater 9. After heating the air, it is taken out into the room through the hole for air outlet into the room 4, during which its temperature is measured using and temperature sensor 12. And if the air is not warmed up to the desired temperature, the operation of the heater 9 is corrected based on the readings of the temperature sensor 12.

[47] Additional steps may be added to the heated air purification process all at once, individually or in any combination. Some of them are implemented by introducing additional elements into the device, also described above.

[48] The present application materials provide a preferred disclosure of the implementation of the claimed technical solution, which should not be used as limiting other, private embodiments of its implementation, which do not go beyond the requested scope of legal protection and are obvious to specialists in the relevant field of technology.

Claims (25)

1. Supply and recirculation unit, including a housing in which at least one hole for air intake from the room, at least one hole for air intake from the street and at least one hole for air outlet are made, and at least one at least two coarse filters, at least two fine filters, a heater and a fan, and at least one temperature sensor is installed in the area of the air intake from the street and in the area of the air outlet. 2. The air handling unit according to claim 1, characterized in that a pre-filter and / or a primary filter of class in the range from G1 to G4 / from G4 to F7 is used as a coarse filter. 3. Supply and recirculation unit according to claim 2, characterized in that the primary filter is made with a capacity in the range of 1000-2000 mg. 4. The supply and recirculation unit according to claim 1, characterized in that a HEPA filter and / or an EPA filter and an adsorption-catalytic filter are used as a fine filter. 5. The supply and recirculation unit according to claim 4, characterized in that the HEPA filter and / or EPA filter is made with an increased capacity, and the adsorption-catalytic filter is made with a reduced capacity so that the ratio of the capacities of the HEPA filter and / or EPA -filter and adsorption-catalytic filter is 5/1-12/1. 6. Air handling unit according to claim 5, characterized in that the capacities of the HEPA filter and / or EPA filter are selected in accordance with the ratio of their capacities in such a way that the pressure drop between them does not change. 7. Supply and recirculation unit according to claim 4, characterized in that a HEPA filter of class H11 and higher is used. 8. Air handling unit according to claim 4, characterized in that an EPA filter of class E11 is used. 9. Supply and recirculation unit according to claim 4, characterized in that the HEPA filter and / or EPA filter is impregnated with antibacterial impregnation. 10. Supply and recirculation unit according to claim 1, characterized in that dampers are made in the openings for air intake from the room and from the street. 11. Supply and recirculation unit according to claim 1, characterized in that bearings are installed in the fan. 12. Supply and recirculation unit according to claim 11, characterized in that the bearings are made of rubberized protective washers. 13. The supply and recirculation unit according to claim 11, characterized in that the bearings use high-slip grease. 14. A method of cleaning air with heating, according to which: - they let in air from the room and/or from the street through the hole for taking air from the room and/or through the hole for taking air from the street, respectively; - conduct air through at least two coarse filters; - conduct air through at least two fine filters; - the purified air is heated by means of a heater; - remove air into the room through the air outlet, at the same time, with the help of at least one temperature sensor located in the area of the air intake hole, the temperature of the supply air coming from the street is measured, and with the help of at least one temperature sensor located in the area of the air outlet hole, the the temperature of the heated purified air entering the room, and the heater operation algorithm is adjusted based on the readings of at least one of the temperature sensors. 15. A method for cleaning air with heating according to claim 14, characterized in that before the stage of air intake from the room and / or from the street: - determine whether the "inflow", "recirculation" or "mixed" mode is set; - open and/or close the respective damper and/or the respective dampers installed in the respective air intake openings. 16. The heated air purification method according to claim 14, characterized in that at the stage of passing the air through at least two coarse filters, the air is passed through a pre-filter and / or a primary filter of a class in the range from G1 to G4 / from G4 to F7. 17. The method of purifying air with heating according to claim 14, characterized in that at the stage of the air wire through at least two fine filters, air is conducted through a HEPA filter and / or an EPA filter and / or an adsorption-catalytic filter and / or through any combination of them.

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