Arrangement and method for purifying indoor air

Abstract

An arrangement (100) and method for purifying indoor air in a room with a high voltage (HV) attraction panel (16). The high voltage (HV) attraction panel (16) comprises a HV panel (4) replaceable arranged in the attraction panel (16), a HV power supply (20) detachably connected to said HV panel (4), and an electrically isolated transparent attraction plate (2) arranged on the face side (22) of the attraction panel. The arrangement (100) is configured to purify indoor air without need for circulating said indoor air.

Description

[0001] ARRANGEMENT AND METHOD FOR PURIFYING INDOOR AIR

[0002] BACKGROUND

[0003] The invention relates to an arrangement for purifying indoor air with a high voltage (HV) attraction panel .

[0004] The invention further relates to a method for purifying indoor air .

[0005] While portable air cleaners and heating, ventilation, and air conditioning (HVAC) filters can be effective in reducing indoor air pollution, it ' s important to note that they cannot eliminate pollutants directly from the air . Air circulators are not des igned to treat the entire room air volume simultaneously . Instead, they treat a fraction of the room volume per unit time , resulting in fractional air dilution . Thi s means that removing pathogenic particles using air circulators may take a significant amount of time .

[0006] Saniti zing techniques may include the use of ultraviolet (UV) light , ozone, or chemicals . While these saniti zing methods can be ef fective , they can also have potential side effects and often require air circulation .

[0007] Pathogen particles released from humans are predominantly electrically charged in indoor environments without electrostatic control , i . e . , rooms without systems or arrangements reducing charge accumulation . Uncharged particles tend to polari ze in electrostatic field . Charged and polari zed particles accelerate to-wards oppositely charged surfaces .

[0008] BRIEF DESCRIPTION

[0009] Viewed from a first aspect , there can be provided an arrangement for purifying indoor air in a room with a high voltage (HV) attraction panel comprising a HV panel replaceable arranged in the attraction panel , a HV power supply detachably connected to said HV panel , an electrically isolated transparent attraction plate arranged on the face s ide of the attraction panel , and an electrical isolation, wherein the arrangement is configured to purify indoor air by pulling charged or polari zed particles in the air to the attraction panel , to the electrically isolated transparent attraction plate thereof , without need for circulating said indoor air .

[0010] Viewed from the further aspect, there can be provided a method for purifying indoor air with a high voltage attraction panel of the first aspect , the method comprising pulling charged or polari zed particles in the air to the attraction panel , to the electrically isolated transparent attraction plate thereof .

[0011] An advantage of the arrangement and method is that indoor air is purified by means of apparatus or device ( the arrangement ) that can also be adapted to many other use and purposes . Thus , purified air can be provided in the room without need to arrange therein distinct or separate obj ects that would take care of the indoor air purifying task .

[0012] A further advantage is that the energy consumption of electrically isolated attraction panels may be significantly lower compared to the circulation of air us ing classic techniques such as high efficiency particulate air filtering (HEPA) or electrostatic filtering systems . The method is silent compared to the air circulation .

[0013] The arrangement and the method are characterised by what is stated in the independent claims . Some other embodiments are characterised by what is stated in the other claims . Inventive embodiments are also disclosed in the specification and drawings of this patent application . The inventive content of the patent application may also be defined in other ways than defined in the fol lowing claims . The inventive content may also be formed of several separate inventions , especially if the invention is examined in the l ight of expressed or implicit subtasks or in view of obtained benef its or benefit groups . Some of the definitions contained in the following claims may then be unneces sary in view of the separate inventive ideas . Features of the different embodiments of the invention may, within the scope of the basic inventive idea, be applied to other embodiments .

[0014] In an embodiment , the arrangement comprises electrically isolated HV attraction panels with negative and positive polarity in a same room. An advantage is that purification is effective with both polarities of steady state HV .

[0015] In an embodiment , the arrangement comprises only one electrically isolated HV attraction panel with sequentially alternating polarity is used in a room . An advantage is that puri fication of air can be obtained by one electrically isolated HV attraction panel .

[0016] In an embodiment , the arrangement may comprise at least one electrically isolated HV attraction panel and external ion source for charging airborne particles . An advantage is that the particles in a room will be charged making purification effective .

[0017] In an embodiment the arrangement is used as an interior element , such as a decoration element , a poster, a piece of art , a painting, or as a piece of advertisement , an information board, a display, and / or a white-board . In an embodiment , the electrically isolated HV attraction panels are used inside industrial equipment to decrease harmful contamination . In an embodiment , the industrial equipment is an assembly machine or a composing machine .

[0018] In an embodiment , the electrically isolated HV attraction panels are used in workstations of cleanrooms to decrease harmful contamination .

[0019] In an embodiment , the electrically isolated HV attraction panels are used in elevators .

[0020] In an embodiment , the electrically isolated HV attraction panel s are used in rooms that have low air circulation .

[0021] In an embodiment , the electrically isolated HV attraction panels are used in public transportation such as busses , trains , airplanes , and taxis .

[0022] In an embodiment , the HV power supply comprises a HV converter that is a steady state HV converter or alternating polarity HV converter, and a HV power supply .

[0023] In an embodiment , the arrangement comprises a replaceable visual layer arranged in the attraction panel wherein said placeable visual layer is arranged between the HV panel and the electrically isolated transparent attraction plate .

[0024] In an embodiment , the HV panel comprises a screen for showing visible information and / or art .

[0025] In an embodiment , the HV panel comprises at least one of the following : a mirror , a lighting unit , an energy harvesting unit . In an embodiment , the replaceable visual layer is at least partly transparent .

[0026] In an embodiment , the HV panel compri ses a screen configured to show visible information and / or art though the replaceable visual layer .

[0027] In an embodiment , the electrical isolation comprises one or more electrically insulating plastics selected in polystyrene PS , polycarbonate PC, polyethylene PE and polyethylene terephthalate PET .

[0028] In an embodiment , the arrangement comprises one or more HV attraction panels attached to the wall ( s ) or the ceiling of the room .

[0029] In an embodiment , the arrangement comprises an ionisation unit arranged separate from the HV attraction panel and configured to charge airborne particles in the room by using unipolar ioni zation .

[0030] In an embodiment , the HV attraction panel comprises an electrically insulating frame arranged for holding together the structure of said HV attraction panel .

[0031] In an embodiment , the electrically insulating frame comprises a plurality of electrically insulating pro-file lists and an electrically insulating lock unit arranged for connecting at least two electrically insulating profile lists .

[0032] BRIEF DESCRIPTION OF FIGURES

[0033] Some embodiments illustrating the present disclosure are described in more detail in the attached drawings , in which Figure 1 shows an example of air purification effectiveness of an arrangement ,

[0034] Figure 2 is a schematic view of an arrangement and method,

[0035] Figure 3 is a schematic view of another arrangement and method,

[0036] Figure 4 is a schematic view of a third arrangement and method,

[0037] Figure 5 is a schematic side view of an arrangement in partial cross-section,

[0038] Figures 6a- 6d are schematic views of an arrangement in partial cross-section,

[0039] Figures 7a and 7b are schematic views of an arrangement in partial cross-section, and

[0040] Figure 8 is a schematic view of a HV power supply used to energi ze the electrically isolated HV panel .

[0041] In the figures , some embodiments are shown simplified for the sake of clarity . S imi lar parts are marked with the same reference numbers in the figures .

[0042] DETAILED DESCRIPTION

[0043] Figure 1 shows purification effectiveness of an arrangement for purifying indoor air with high voltage (HV) attraction panels 16 without circulating the air . The arrangement comprises one negative ion source and two electrically isolated HV attraction panels at 7 kV . Si ze of the attraction plates in a test room was 2 m2. Area of the room was 10 m2. Air volume was 30 m3. Ventilation of the room was based on gravity . Approximately 65 % purification was achieved by attraction panels in 30 minutes . Portable cleaner resulted in 20 % purification in 30 minutes in the same test conditions with HEPA Filter of 99 . 95 % .

[0044] Figure 2 is a schematic view of an arrangement and method for purifying indoor air with the HV attraction panel 16 . The HV attraction panel comprises an electrically conductive or dissipative HV panel 4 , an electrical isolation 17 , an electrically isolated transparent attraction plate 2 , and HV power supply 20 . The HV attraction panel 16 forms a quasistatic capacitance 18 to the surroundings affecting the potential energy of the HV panel 4 . In an embodiment , the potential energy is limited to 200 mJ .

[0045] The HV panel 4 is replaceable arranged in the attraction panel 16 . In other words , the HV panel 4 can be removed or detached from the attraction panel 16 with-out need to break or smash the structure of the attraction panel , and replaced by another HV panel 4 .

[0046] The electrical isolation 17 is arranged to envelope the HV attraction panel 16 such that high voltages of said HV attraction panel cannot cause harm to human beings staying in the room or even touching the HV attraction panel 16 . In an embodiment, the electrical isolation 17 comprises isolation elements comprising or consisting of one or more electrically insulating plastics selected in polypropylene PP, polylactic acid PLA, thermoplastic polyester TP, acrylonitrile butadiene styrene ABS , polystyrene PS , polycarbonate PC, polyethylene PE and polyethylene terephthalate PET . The electrical isolation 17 may prohibit electrical breakdowns and electrical shocks . In an embodiment, the HV panel 4 contains visible information and / or art that is seeable through the electrically isolated transparent attraction plate 2. Said visible information and / or art may comprise, e.g., text, images (still and / or moving visual media) , etc., intentionally produced and shown to the indoors. In an embodiment, the HV panel 4 contains a screen, such as a digital display (e.g. LCD or LED) for showing the visible information and / or art on the face side 22 of the attraction panel.

[0047] In an embodiment, the room is a public area or a common area, and the HV panel 4 is arranged for showing announcements and / or advertisements. In an embodiment, the room is in a public transport vehicle, such as a bus, a train, a metro, an airplane, a taxi etc.

[0048] In an embodiment, the HV panel 4 is arranged for showing at least one parameter of the room, such as a room air purity, temperature and / or humidity. In this embodiment, the high voltage (HV) attraction panel 16 is connected to a means and a sensor providing the data or information about a measuring value of the parameter.

[0049] In an embodiment, the HV panel 4 comprises a mirror reflecting light coming from the room.

[0050] In an embodiment, the HV panel 4 comprises a lighting unit arranged for lighting the room.

[0051] In an embodiment, the HV panel 4 comprises an energy harvesting unit, such as a solar panel. In an embodiment, the energy harvested by the energy harvesting unit is used for operating the HV attraction panel 16.

[0052] In an embodiment, the HV attraction panel 16 comprises a replaceable visual layer 3 that is arranged between the HV panel 4 and the electrically isolated transparent attraction plate 2 .

[0053] The replaceable visual layer 3 is replaceable arranged in the attraction panel 16 . In other words , the replaceable visual layer 3 can be removed or detached from the attraction panel 16 without need to break or smash the structure of the attraction panel , and replaced by another replaceable visual layer 3 .

[0054] In an embodiment , the HV panel 4 contains visible information and / or art that i s seeable through the electrically isolated transparent attraction plate 2 , and the replaceable visual layer 3 that is at least partly transparent .

[0055] In an embodiment , the replaceable visual layer 3 contains visible information and / or art that is seeable through the electrically isolated transparent attraction plate 2 .

[0056] In an embodiment , an external or integrated steady state DC-HV or pulsed-HV power supply is configured so that the insulation resistance from electrically conductive , dissipative or slowly dissipative parts , preferably all of them, (e . g . , according to IEC 61340 - 6-2 : 2023 : Slowly dissipative materials shall have a half decay time of < 30 s from an initial value of ( 1100 ± 100 ) V to 50 % of the initial value measured according to Method 2 of EN 1149-3 : 2004 or an equivalent method) to the outer surface of the panel , i . e . , to the outer surface of the attraction plate 2 , is at least 100 GQ and the breakdown field strength is strong enough to prevent dielectric breakdown at the nominal voltage of HV attraction panel . In an embodiment , the insulation resistance (volume and surface resistance ) of the attraction plate 2 is selected in range of 1 MQ - 10 TQ, preferably 10 MQ - 1 TQ, measured according to IEC 61340 -2 -3 . An advantage of this embodiment is that the presence of ions in ambient air, such as in room air, don' t affect the surface charge density of attraction plate 2 so that the electrostatic field and performance of the panel would be reduced or diminished .

[0057] In an embodiment , the insulation resistance of the electrically isolated transparent attraction plate 2 is selected in range of 1 MQ - 10 TQ, preferably 10 MQ - 1 TQ, measured according to IEC 61340 -2 -3 .

[0058] In an embodiment , the attraction plate 2 is at least mainly made of polymer material , i . e . , made of or comprises polymer material or polymer material composition the insulation resistance of which is in range of 1 MQ - 10 TQ, preferably 10 MQ - 1 TQ, measured according to IEC 61340 -2 -3 . In an embodiment , the attraction plate 2 is made of or it comprises at least one thermoplastic, such as polycarbonate PC, poly (methyl methacrylate ) PMMA, polyethylene terephthalate PET , polyvinylchloride PVC, polypropylene PP, cyclic olefin copolymer COC, styrene acrylonitrile SAN, styrene methyl methacrylate copolymer SMMA, inherently dissipative polymer IDP, etc . The targeted or desired insulation resistance value is achieved through appropriate compounding or additives . For instance , IDP material can be added to thermoplastic material .

[0059] In an embodiment , the attraction plate 2 i s made of or comprises glass , the insulation resistance of which is in range of 1 MQ - 10 TQ, preferably 10 MQ - 1 TQ, measured according to IEC 61340 -2 -3 .

[0060] In an embodiment , energy discharge from isolated conductive parts of the panel is limited to the safe level of 200 mJ to pre-empt any adverse effect of potential insulation failure .

[0061] The electrostatic field permeates dielectric materials enabling the use of transparent electrically insulating layer as an attraction surface . These properties may be used to remove pathogenic particles directly from the room without need for air circulation . In other words , there is no need for moving or circulating air by venti lation units , fans , etc . devices or systems that are arranged to force air to move in the room, out from room and / or into the room . I t i s to be noted, however , that the arrangement and the method described in this description may also be used in rooms where air is actively circulated .

[0062] The materials and dimensions are characteri zed in such a way that electric breakdowns or corona discharges do not occur under the operating conditions of the arrangement 100 . In an embodiment , this means avoiding sharp shapes , edges and corners and using materials and dimensions that do not cause breakdown with nominal voltage .

[0063] In an embodiment of the arrangement and method, the voltage on the HV panel is ranged up to 60 kV, preferably 30 kV at most , more preferably 15 kV at most , more preferably 10 kV at most .

[0064] In an embodiment of the arrangement and method the HV attraction panels are energi zed with HV power supply having moderate power consumption below 5 W .

[0065] In an embodiment of the arrangement and method the HV attraction panels are energi zed below 100 pA to 15 kV in less than 10 seconds , and the steady state leakage current of the energized panel with 15 kV is below 1 pA while constantly required power is below 15 mW . An advantage is that the HV attraction panels can be energi zed by using low energy power supplies , batteries , or energy harvesting technologies to purify indoor air .

[0066] In an embodiment , an ionisation unit 23 is arranged for charging airborne particles in the room . In an embodi ment , said charging is carried out by using unipolar ioni zation . In an embodiment , said ioni zation is based on a corona discharge .

[0067] The charged or polari zed particles can be transferred directly from the source to the attraction panel without air circulation . This arrangement can result in more effective purification than circulating air through portable air cleaners . The larger the attraction panel is , and closer it is to the pollution source , the better purification effect can be achieved for charged particles . Furthermore , the high voltage attraction panel can be touched without unpleasant sensations thanks to the electrical isolation .

[0068] Figure 3 is a schematic view of another arrangement and method . In an embodiment , the arrangement comprises two HV attraction panels with opposite polarities arranged such that an electrostatic field is created .

[0069] Figure 4 is a schematic view of a third arrangement and method . In an embodiment , the HV attraction panel 16 comprises HV panel s 4 with opposite polarities and arranged side by side . In an embodiment , such as shown in Figure 3 , the HV attraction panel comprises two HV panels 4 having opposite polarities .

[0070] Figure 5 is a schematic side view of an arrangement in partial cross-section, and Figures 6a- 6d are schematic views of an arrangement in partial cross-section . In an embodiment, the arrangement comprises a removable electrically insulating frame 1 that keeps together a sandwich structure of an electrically isolated transparent attraction plate 2, a replaceable visual layer 3, a HV panel 4, and an electrically insulating back plate 5.

[0071] In an embodiment, the removable electrically insulating frame 1 comprises at least one electrically insulating profile list, such as a U-list 12 and at least one electrically insulating lock unit 13 configured to connect and lock the insulating profile list(s) 12. In an embodiment, these parts of the removable electrically insulating frame 1 are made of a suitable polymer or polymer-composite material as described in this description. The electrically insulating profile list(s) 12 and electrically insulating lock unit(s) 13 are joined to the electrically isolated transparent attraction plate 2 and the electrically insulating back plate 5.

[0072] In an embodiment, the lock unit 13 serves as a mounting support through which the HV attraction panel 16 is attached to a supporting structure, such as a wall or a ceiling, for instance.

[0073] In an embodiment, the HV attraction panel 16 and the removable electrically insulating frame 1 framing said attraction panel have a rectangular shape, and the electrically insulating profile lists 12 are connected by four electrically insulating lock units 13 arranged in the corners of the frame.

[0074] In an embodiment, the HV panel 4 comprises a screen, such as a digital display (e.g. LCD or LED) for showing visible information and / or art on the face side 22 of the attraction panel. If the HV attraction panel 16 also comprises the replaceable visual layer 3, said replaceable visual layer is at least partly transparent for allowing the screen to be seeable therethrough .

[0075] In an embodiment the HV panel 4 comprises a conductive or dissipative HV plate . In an embodiment , the HV plate is made of metal or conductive carbon black plastics .

[0076] In an embodiment , the HV plate i s used together with a replaceable visual layer 3 .

[0077] In an embodiment , the HV plate is provided with a visible information and / or art seeable on the face side 22 of the attraction panel . I f the HV attraction panel 16 also comprises the replaceable visual layer 3 , said replaceable visual layer is at least partly transparent for allowing the visible information and / or art to be seeable therethrough .

[0078] In an embodiment , the HV panel 4 is transparent and the electrically insulating back plate 5 is arranged to show visible information and / or art to be seeable through the transparent HV panel 4 . Said insulating back plate 5 may comprise a screen, such as a digital display (e . g . LCD or LED) . I f the visual layer 3 is also present , it is at least partly transparent .

[0079] In an embodiment , the HV panel 4 is transparent and is arranged between the electrically isolated transparent attraction plate 2 and the visual layer 3 . Then, the visible information and / or art shown by the visual layer 3 can be seen through the transparent HV panel 4 and the transparent attraction plate 2 .

[0080] In an embodiment, the electrically isolated transparent attraction plate 2 , the insulation resistance of which is preferably selected in range of 1 MQ - 10 TQ, preferably 10 MQ - 1 TQ, is electrically connected to the HV panel 4 . In an embodiment , said connection is reali zed through the visual layer 3 that has at least substantially same insulation resistance , preferably in the same magnitude , as the attraction plate 2 .

[0081] In an embodiment , at least one of the attraction plates 2 and the HV panel 4 has a connecting film laminated thereto , and this film provides the electrical connection between the attraction plate 2 and the the HV panel 4 . In an embodiment , said film comprises IDP material .

[0082] In an embodiment , at least one of the attraction plates 2 and the the HV panel 4 has an extension part that i s bent and connected to another entity of said attraction plate and the HV panel .

[0083] In an embodiment , there are one or more conductors through and / or past the visual layer 3 .

[0084] The replaceable visual layer 3 can be replaced by removing at least one of the electrically insulating lock units and one of the electrically insulating profile li sts 12 so that the replaceable visual layer 3 can be removed from the sandwich structure , and then replaced with another replaceable visual layer .

[0085] The replaceable visual layer 3 can be made of same or similar materials as the electrically isolated transparent attraction plate 2 and disclosed in this disclosure . In an embodiment , the replaceable visual layer 3 is made of or comprises paper, board, cardboard, fabric, textile , canvas , etc . In an embodiment , the replaceable vi sual layer 3 has insulation resistance in range of 1 MQ - 10 TQ, preferably 10 MQ - 1 TQ . In an embodiment , the insulation resistances of the electrically isolated transparent attraction plate 2 and the replaceable visual layer 3 are in the same magnitude . In an embodiment, the electrically insulating lock unit 13 comprises a locking component 14, such as a latch, a tab or a screw.

[0086] It is to be noted that the HV attraction panel A may have some another shape as rectangular. The shape may be, e.g., any polygonal shape, round, oval or any combination of curves and / or straight lines.

[0087] Figures 7a and 7b are schematic views of an arrangement in partial cross-section. In an embodiment, the arrangement 100 comprises an electrically insulating mounting support 6 for mounting the HV attraction panel 16 to a wall or ceiling 15.

[0088] In an embodiment, the mounting support 6 provides a distance D between the electrically insulating back plate 5 and the wall or ceiling 15. In an embodiment, the distance D is at least 30 mm.

[0089] In an embodiment, the mounting support 6 is attached to an electrically insulating mounting plate 7 arranged on the backside of the HV attraction panel 16. In an embodiment, another end of the mounting support 6 is attached to a mounting plate 10, that comprises means, such as a hole, for attachment to the wall or ceiling 15.

[0090] In an embodiment, a HV connection cable 8 that is configured to apply high voltage to HV panel 4 is arranged to run through the insulating mounting plate 7.

[0091] In an embodiment, the grounding of the HV attraction panel 16 is realized by a ground connection cable 9 that is connected to the mounting plate 10. Figure 8 is a schematic view of a HV power supply used to energi ze the HV attraction panel . In an embodiment , the HV power supply 20 comprises a HV converter 11 , a HV series Resistors Rl , R2 , and an internal HV load R3 .

[0092] The HV converter 11 may convert a steady state high voltage ( DC-HV or AC-HV) or sequentially alternating polarity ( DC-HV or AC-HV) . In an embodiment , the sequentially alternating polarity comprises square pulse of +15000 V and - 15000 V with pulse width of 30 s .

[0093] In an embodiment a low voltage power supply i s used to energi ze the HV converter 11 .

[0094] In an embodiment the HV converter is energi zed by using low energy power supplies , batteries , or energy harvesting technologies .

[0095] In an embodiment the input low of DC-DC HV converter is connected to the output low by fixed line for the single polarity or by high voltage switch and resistor for selectable polarity .

[0096] In an embodiment the HV converter can be control led by external equipment for example microcontroller and USB or Bluetooth .

[0097] The invention is not limited solely to the embodiments described above, but instead many variations are possible within the scope of the inventive concept defined by the claims below . Within the scope of the inventive concept the attributes of different embodiments and applications can be used in conj unction with or replace the attributes of another embodiment or application .

[0098] The drawings and the related description are only intended to illustrate the idea of the invention . The invention may vary in detail within the scope of the inventive idea defined in the following claims .

[0099] REFERENCE SYMBOLS

[0100] 1 electrically insulating frame

[0101] 2 electrically isolated transparent attraction plate

[0102] 3 replaceable visual layer

[0103] 4 HV panel

[0104] 5 electrically insulating back plate

[0105] 6 electrically insulating mounting support

[0106] 7 electrically insulating mounting plate

[0107] 8 HV connection cable

[0108] 9 ground connection cable

[0109] 10 mounting plate with ground connection

[0110] 11 HV converter ( steady state or alternating polarity, DC-HV or DC-AC-HV)

[0111] 12 electrically insulating profile list

[0112] 13 electrically insulating lock unit

[0113] 14 locking component

[0114] 15 wall or ceiling

[0115] 16 HV attraction panel

[0116] 17 electrical isolation

[0117] 18 capacitance between hv attraction panel and surroundings

[0118] 20 HV power supply

[0119] 21 high voltage resistor (Rl , R2 and R3 )

[0120] 22 face side

[0121] 23 ionisation unit

[0122] 100 arrangement

[0123] 200 room

[0124] AC alternating current

[0125] DC direct current

[0126] HV high voltage

[0127] D distance

Claims

CLAIMS1. An arrangement (100) for purifying indoor air in a room with a high voltage (HV) attraction panel (16) comprising- a HV panel (4) replaceable arranged in the attraction panel (16) ,- a HV power supply (20) detachably connected to said HV panel ( 4 ) ,- an electrically isolated transparent attraction plate (2) arranged on the face side (22) of the attraction panel, and- an electrical isolation (17) , wherein- the arrangement (100) is configured to purify indoor air by pulling charged or polarized particles in the air to the attraction panel (16) without need for circulating said indoor air.

2. The arrangement as claimed in claim 1 wherein- the HV power supply (20) comprises a HV converter (11) that is a steady state HV converter or alternating polarity HV converter, and a HV power supply (20) .

3. The arrangement as claimed in any of the preceding claims, comprising- a replaceable visual layer (3) arranged in the attraction panel (16) wherein- said replaceable visual layer (3) is arranged either between the HV panel (4) and the electrically isolated transparent attraction plate (2) , or another side of the HV panel (4) as the electrically isolated transparent attraction plate (2) , in which case said HV panel (4) is at least partly transparent.

4. The arrangement as claimed in any of claims 1-2, wherein- the HV panel (4) comprises a screen for showing visible information and / or art.

5. The arrangement as claimed in any of claims 1-2, wherein- the HV panel (4) comprises at least one of the following :- a mirror,- a lighting unit,- an energy harvesting unit.

6. The arrangement as claimed in claim 3, wherein- the replaceable visual layer (3) is at least partly transparent .

7. The arrangement as claimed in claim 6, wherein- the HV panel (4) comprises a screen configured to show visible information and / or art though the replace-able visual layer (3) .

8. The arrangement as claimed in claim 6, wherein- the HV panel (4) comprises at least one of the following :- a mirror,- a lighting unit,- an energy harvesting unit.

9. The arrangement as claimed in any of claims 3-8, wherein- the replaceable visual layer (3) is configured to show visible information and / or art.

10. The arrangement as claimed in any of the preceding claims, wherein- the electrical isolation (17) comprises one or more electrically insulating plastics selected in polypropylene PP, polylactic acid PLA, thermoplastic polyester TP, acrylonitrile butadiene styrene ABS, polystyrene PS,polycarbonate PC, polyethylene PE and polyethylene terephthalate PET.

11. The arrangement as claimed in any of the preceding claims, comprising- one or more HV attraction panels (16) attached to the wall (s) or the ceiling of the room.

12. The arrangement as claimed in any of the preceding claims, comprising- an ionisation unit (23) arranged separate from the HV attraction panel (16) and configured to charge airborne particles in the room by using unipolar ionization.

13. The arrangement as claimed in any of the preceding claims, wherein- the HV attraction panel (16) comprises an electrically insulating frame (1) arranged for holding together the structure of said HV attraction panel.

14. The arrangement as claimed in claim 13, wherein the electrically insulating frame (1) comprises- a plurality of electrically insulating profile lists (12) and- an electrically insulating lock unit (13) arranged for connecting at least two electrically insulating profile lists ( 12 ) .

15. The arrangement as claimed in any one of the preceding claims, wherein- the HV panel (4) is transparent,- the optionally arranged visual layer (3) is transparent, and- the electrically insulating back plate (5) is arranged to show visible information and / or art through the transparent HV panel (4) , the optionally arranged visuallayer (3) and the electrically isolated transparent attraction plate (2) .

16. The arrangement as claimed in claim 15, wherein- the insulating back plate (5) comprises a screen.

17. The arrangement as claimed in any of the preceding claims, wherein- the electrically isolated transparent attraction plate (2) has insulation resistance in range of 1 MQ - 10 TQ, preferably 10 MQ - 1 TQ.

18. The arrangement as claimed in any of the preceding claims, wherein- the electrically isolated transparent attraction plate (2) is at least mainly of polymer material.

19. The arrangement as claimed in any one of claims 1- 17, wherein- the electrically isolated transparent attraction plate (2) is of glass.

20. The arrangement as claimed in any of the preceding claims, wherein- the replaceable visual layer (3) has insulation resistance in range of 1 MQ - 10 TQ, preferably 10 MQ - 1 TQ.

21. The arrangement as claimed in any of the preceding claims, wherein- the insulation resistance of the electrically isolated transparent attraction plate (2) is in the same magnitude with the insulation resistance of the replaceable visual layer (3) .

22. A method for purifying indoor air with a high voltage (HV) attraction panel (16) as claimed in any of claims 1 - 21, the method comprising- pulling charged or polarized particles in the air to the attraction panel.

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