BLADELESS FAN FOR COMMERCIAL APPLICATIONS

Abstract

A bladeless fan comprising a ring-shaped chamber extending longitudinally and defining a suctioned air passage having a main-flow inlet and a main-flow outlet; a compressed-gas inlet adapted to receive compressed gas and to provide the compressed gas to the ring-shaped chamber; and a proximal row of channels radially distributed about the suctioned air passage. The channels provide a fluid connection for the compressed gas from the ring-shaped chamber to the suctioned air passage thereby generating a pressure differential along the suctioned air passage and forcing a flow of gas from the main-flow inlet to the main-flow outlet.

Description

BACKGROUND

(a) Field

The subject matter disclosed generally relates to a fan. More specifically, it relates to a bladeless fan for moving air in commercial and industrial applications.

(b) Related Prior Art

There are various types of fans, which all serve the purpose of pushing air (or gas) to generate a flow of air, either for air circulation in a room or for evacuating warm air, for example.

From a general point of view, these fans consume space and energy, which can become problematic for uses such as computer systems, which require fans to evacuate warm air, or HVAC (heating, ventilation, and air conditioning) systems, which consume a lot of power in a building.

Furthermore, fans producing higher cubic feet per minute (CFM) are always in demand and, more so, fans offering better power consumption ratio (CFM per Watt or CFM/W). Such using high efficiency fans, especially in commercial and industrial applications, result in lowering power consumption and costs.

Moreover, fans are mechanical apparatuses, and as such, comprise mechanical parts which are prompt to occasional failure.

In view of this context, it is possible to propose solutions that are improvements over the existing axial fans which use blades that rotate around an axis to draw air in parallel to that axis and force air out in the same direction.

SUMMARY

According to an embodiment, there is provided a bladeless fan comprising: a ring-shaped chamber extending longitudinally and defining a suctioned air passage having a main-flow inlet and a main-flow outlet; a compressed-gas inlet adapted to receive compressed gas and to provide the compressed gas to the ring-shaped chamber; and a proximal row of channels radially distributed about the suctioned air passage wherein the channels provide a fluid connection for the compressed gas from the ring-shaped chamber to the suctioned air passage thereby generating a pressure differential along the suctioned air passage and forcing a flow of gas from the main-flow inlet to the main-flow outlet, further wherein the proximal row of channels is closer to the main-flow inlet than to the main-flow outlet.

According to an aspect, the ring-shaped chamber comprises an inner face having an airfoil profile where a diameter of the suctioned air passage near the main-flow inlet is smaller than a diameter of the suctioned air passage near the main-flow outlet.

According to an aspect, the channels have a downstream angle greater than zero (0) degrees.

According to an aspect, the channels have a swirling angle greater than zero (0) degrees.

According to an aspect, the bladeless fan further comprises a source of compressed gas connected to the compressed-gas inlet.

According to an aspect, the source of compressed gas comprises a gas cylinder.

According to an aspect, the source of compressed gas comprises a compressor.

According to an aspect, the bladeless fan further comprises an additional row of channels, wherein the additional row is located farther from the main-flow inlet than the proximal row of channels.

According to an aspect, the compressed-gas inlet is closer to the proximal row of channels than to the additional row of channels.

According to an aspect, the channels of the additional row have a cross-section area greater than the cross-section area of the channels of the proximal row.

According to an aspect, the channels of the proximal row of channels have a first swirling angle, the channels of the additional row of channels have a second swirling angle, and the first swirling angle is greater than the second swirling angle.

According to an aspect, the proximal row of channels comprises at least three channels distant from each other and where the at least three channels are within a gas inlet plane perpendicular to a longitudinal axis.

According to an aspect, the proximal row of channels is longitudinally distant from the main-flow inlet.

According to an aspect, the compressed-gas inlet is closer to the main-flow inlet than to the main-flow outlet.

According to an aspect, the suctioned air passage has a cylindrical shape.

According to an embodiment, there is provided a bladeless fan assembly for accelerating a flow of gas in a lumen of a heating, ventilation, and air conditioning (HVAC) system, the lumen having an inner face, the bladeless fan assembly comprising: a ring-shaped chamber extending longitudinally and defining a suctioned air passage having a main-flow inlet and a main-flow outlet; a compressed-gas inlet adapted to receive compressed gas and to provide the compressed gas to the ring-shaped chamber; a proximal row of channels radially distributed about the suctioned air passage wherein the channels provide a fluid connection for the compressed gas from the ring-shaped chamber to the suctioned air passage thereby generating a pressure differential along the suctioned air passage and accelerating a first portion of the flow of gas from the main-flow inlet to the main-flow outlet; and at least one bracket adapted to mount the ring-shaped chamber to the inner face of the lumen of the HVAC system, wherein a second portion of the flow of gas travels between the inner face of the HVAC system and the ring-shaped chamber, whereby the first portion and the second portion of the flow of gas mix downstream of the ring-shaped chamber to generate an accelerated flow of gas.

According to an aspect, the at least one bracket has an airfoil shape perpendicular to the second portion of the flow of gas.

According to an aspect, the ring-shaped chamber has an inner wall delimiting the suctioned air passage and an external wall opposite the suctioned air passage, wherein the inner wall and the external wall form a cylindrically shaped airfoil.

According to an aspect, the bladeless fan assembly further comprises a source of compressed gas connected to the compressed-gas inlet, wherein the source of compressed gas is located outside the lumen.

According to an aspect, the bladeless fan assembly further comprises an upstream inlet located within the lumen, the upstream inlet being fed with compressed gas which in turn feeds the ring-shaped chamber.

According to an embodiment, there is provided a bladeless fan comprising: a ring-shaped chamber extending longitudinally and defining a suctioned air passage having a main-flow inlet and a main-flow outlet; a compressed-gas inlet adapted to receive compressed gas and to provide the compressed gas to the ring-shaped chamber; and rows of channels radially distributed about the suctioned air passage wherein the channels provide a fluid connection for the compressed gas from the ring-shaped chamber to the suctioned air passage thereby generating a pressure differential along the suctioned air passage and forcing a flow of gas from the main-flow inlet to the main-flow outlet.

According to an aspect, a proximal row of the rows of channels is closer to the main-flow inlet than to the main-flow outlet.

According to an aspect, the channels within each of the rows of channels are within a respective gas inlet plane perpendicular to the flow of gas.

According to an aspect, the ring-shaped chamber comprises an inner face having an airfoil profile where a diameter of the suctioned air passage near the main-flow inlet is smaller than a diameter of the suctioned air passage near the main-flow outlet.

According to an aspect, the channels have a swirling angle greater than zero (0) degrees.

According to an aspect, the bladeless fan further comprises a source of compressed gas connected to the compressed-gas inlet.

According to an aspect, the source of compressed gas comprises a gas cylinder.

According to an aspect, the source of compressed gas comprises a compressor.

Features and advantages of the subject matter hereof will become more apparent in light of the following detailed description of selected embodiments, as illustrated in the accompanying figures. As will be realized, the subject matter disclosed and claimed is capable of modifications in various respects, all without departing from the scope of the claims. Accordingly, the drawings and the description are to be regarded as illustrative in nature and not as restrictive and the full scope of the subject matter is set forth in the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Further features and advantages of the present disclosure will become apparent from the following detailed description, taken in combination with the appended drawings, in which:

FIG. 1 is a cross-section view illustrating a bladeless fan for generating a directional flow of gas for ventilation, according to an embodiment;

FIG. 2 is a side perspective view illustrating a bladeless fan, according to an embodiment;

FIG. 3 is a flowchart illustrating a method for generating a directional flow of gas for ventilation, according to an embodiment;

FIG. 4 is a top view of a bladeless fan with cross-section lines;

FIG. 5 is a cross-section view of the walls forming the ring-shaped chamber along the cross-section lines illustrated on FIG. 4 according to an embodiment in which there is a first configuration of channels;

FIG. 6 is a cross-section view of the walls forming the ring-shaped chamber along the cross-section lines illustrated on FIG. 4 according to an embodiment in which there is a second configuration of channels;

FIG. 7 is a cross-section view of the walls forming the ring-shaped chamber along the cross-section lines illustrated on FIG. 4 according to an embodiment in which there is a third configuration of channels;

FIG. 8 is a cross-section view of the walls forming the ring-shaped chamber along the cross-section lines illustrated on FIG. 4 according to an embodiment in which there is a fourth configuration of channels;

FIG. 9 is a cross-section view of the walls forming the ring-shaped chamber along the cross-section lines illustrated on FIG. 4 according to an embodiment in which there is a fifth configuration of channels;

FIG. 10 is a cross-section view of the walls forming the ring-shaped chamber along the cross-section lines illustrated on FIG. 4 according to an embodiment in which there is a sixth configuration of channels;

FIG. 11 is a cross-section view of a bladeless fan assembly mounted to the interior of a ducting with the external source of compressed gas in accordance with an embodiment;

FIG. 12 is a cross-section view of a bladeless fan assembly mounted to the interior of a ducting comprising a compressed gas source that uses the existing airflow in the ducting in accordance with an embodiment;

FIGS. 13A and 13B are schematics of the profile of the walls forming the ring-shaped chamber of the bladeless fan parallel to its axis according to two embodiments; and

FIG. 14 is a cross-section view of an embodiment of a bladeless fan assembly mounted to an air duct.

It will be noted that throughout the appended drawings, like features are identified by like reference numerals.

DETAILED DESCRIPTION

There is described below a bladeless fan for commercial and industrial applications.

Referring to FIGS. 1-2, the bladeless fan 10 comprises a suctioned air passage 100, which is the void portion within the bladeless fan 10 in which the air (aka gas) is drawn and accelerated to generate an accelerated airflow. The suctioned air passage 100 is defined as a lumen within the inner portion of the bladeless fan 10. The lumen of the bladeless fan 10 has a cylindrical shape with open ends at the top and at the bottom.

The bladeless fan 10 has an inner portion defining a inner face 102 which forms the lumen defined by cylinder 200. A directional flow of suctioned air thus travels through the bladeless fan 10 between a main-flow inlet 360 and a main-flow outlet 370, i.e., in the suctioned air passage 100. Preferably, the suctioned air passage 100 has a cylindrical shape.

To generate and accelerate the airflow through the suctioned air passage 100, there is provided a source of compressed air, or, more generally, a source of compressed gas 500.

The bladeless fan 10 is adapted to have compressed gas flowing from the source of compressed gas 500, via a compressed-gas inlet 350, to the suctioned air passage 100 in a manner that will generate a pressure differential along the length of the suctioned air passage 100. This arrangement forces an airflow to travel toward the main-flow outlet 370 of the suctioned air passage 100. The pressure differential is adapted to drive the airflow as a typical axial fan would, however without any mobile mechanical parts therein.

To provide the desired pressure differential along the length, and more particularly the inner face 102 of the suctioned air passage 100, the bladeless fan 10 comprises a cylinder 200, having a longitudinal axis 150, that forms the suctioned air passage 100 (which is the lumen within the cylinder 200). This cylinder 200 has a plurality of perforations, e.g., channels 210, provided along the circumference of the cylinder 200.

Channels 210 are arranged in rows of channels 210. According to different embodiments, there is one or more rows of channels 210 distributed about the suctioned air passage and providing a fluid connection for the compressed gas between the ring-shaped chamber 300 and the suctioned air passage 100.

According to an embodiment, a row of channels 210 (aka a first or proximal row of channels 210) is closer to the main-flow inlet 360 than to the main-flow outlet 370. Still according to an embodiment, the proximal row of channels 210 comprises at least three channels 210 distant from each other and within a gas inlet plane perpendicular to the longitudinal axis 150.

Surrounding the cylinder 200, a ring-shaped chamber 300 acts as an antechamber to the cylinder 200. The ring-shaped chamber 300 is fluidly connected to the suctioned air passage 100 through the channels 210. The ring-shaped chamber 300 is adapted to receive a flow of high-pressure gas, aka compressed gas, and to distribute the compressed gas into the suctioned air passage 100.

This distribution of the flow of compressed gas is made by feeding the compressed gas to the ring-shaped chamber 300 at a bottom portion, i.e., near the main-flow inlet 360, via a compressed-gas inlet 350 located about the bottom portion of the ring-shaped chamber 300. The ring-shaped chamber 300 extends upwardly therefrom.

The ring-shaped chamber 300 acts as an antechamber because the chamber is shaped as a hollow ring surrounding the cylinder 200, with channels 210 providing fluid connection therebetween providing an entrance for the compressed gas into the suctioned air passage 100.

Each one of the channels 210 individually extends substantially radially through the wall 213 forming the cylinder 200. The channels 210 traverse the width of the wall 213 and therefore provide a fluid connection between the ring-shaped chamber 300 and the suctioned air passage 100. Each channel 210 has an input opening 211 connected to the ring-shaped chamber 300, and an output opening 212 connected to the suctioned air passage 100 that is adapted to liberate compressed gas into the suctioned air passage 100.

According to various embodiments, the channels 210 may be of a circular shape, a cylindrical shape, a conical shape, an oval shape, a rectangular shape, or an irregular cross-section.

Similarly, input openings 211 and output openings 212 may take many shapes, which include for example circular, oval, rectangular, irregular or have the shape of a slot. The shape and size of the input openings 211 and output openings 212 of a channel 210 may further be identical or may differ from each other.

The pressure of the compressed gas feeding two different channels 210 depends on the longitudinal coordinates of the channels 210. As illustrated on FIG. 1, the longitudinal coordinates correspond to the height or distance of the channels 210 relative to a pressurized-gas inlet plane perpendicular to the longitudinal axis 150 of the cylinder 200. In other words, the channels 210 have coordinates which correspond to a set of radial and longitudinal coordinates relative to a reference longitudinal coordinate zero (0) corresponding to the compressed-gas inlet 350. Channels 210 that are closer to the compressed-gas inlet 350, i.e., of smaller longitudinal coordinates, receive compressed gas having higher associated pressure since fed with compressed gas first.

Referring to the orientation depicted on FIG. 1, as the compressed gas flows upwardly in the ring-shaped chamber 300, starting from the compressed-gas inlet 350 at the bottom thereof, it encounters channels 210 and, accordingly, undergoes a corresponding pressure drop as a portion of the pressurized air is diverted into additional channels 210. Thus, the spatial distribution of channels 210 across a range of longitudinal coordinates through the cylinder 200 generates variable pressures at the output openings 212 of the channels 210. The result is that the inner face 102 of the wall 213 within the suctioned air passage 100 undergoes a pressure gradient along its length with a generally higher pressure at the bottom and a continuous decrease of pressure upwardly.

The continuous feed of the channels 210 with compressed gas further ensures that the gas which makes up the pressure gradient along the inner face 102 of the cylinder 200 is continuously renewed.

According to an embodiment, the size of the channels 210 increases as the longitudinal coordinate of the channels 210 increases. In other words, the channels 210 become bigger as the channels 210 are located farther from the compressed-gas inlet 350. Accordingly, high-speed high-pressure jets exist close to the main-flow inlet 360 and lower-pressure jets of lowers speed, but of similar volumetric output, exist closer to the main-flow outlet 370.

The effect of the presence and continuous renewal of this pressure gradient is to draw air in the direction of decreasing pressure, i.e., upwardly. The upward flow of air along the inner face 102 of the cylinder 200 generated by the pressure gradient draws air upward within the suctioned air passage 100, thereby producing an acceleration of the airflow entering through the main-flow inlet 360.

According to an embodiment, the shape of the inner face 102 along which travels the airflow from the main-flow inlet 360 to the main-flow outlet 370 has an airfoil shape. According to an embodiment, the airfoil shape of the inner face 102 is designed to optimize the effect of the speed and static pressure of the airflow generated by the jets exiting the channels 210. In consequence, the airfoil shape of the inner face 102 optimizes the airflow exiting the apparatus at the main-flow outlet 370 by benefiting from the Coanda effect.

According to an embodiment, the source of compressed gas 500 is a gas cylinder. Using a bottle of pressurized gas is advantageous in some cases because it requires no mobile mechanical part anywhere in the bladeless fan 10, including the source of compressed gas 500. Therefore, it minimizes the risks of mechanical failures. The bladeless fan 10 may even keep working if there is an electrical power outage, therefore ensuring continuous ventilation of an object or of a location, which can be very useful in a context where continuous ventilation and/or heat removal is a critical aspect, for example in a room comprising heat-generating equipment, or in electronics.

According to an embodiment, a splitter splits the flow of compressed gas from a single source, i.e., using a single gas cylinder, to feed simultaneously a plurality of bladeless fan 10 that ventilate a plurality of areas using the same single source of compressed gas 500.

Alternatively, it is possible to use a compressor, or any other device adapted to such purpose, to generate the necessary compressed gas. Such a solution may be provided by using an appropriate enclosed fan to build up pressure. Such pressure is used as an input of the compressed gas-fed through tubing one or more bladeless fans 10.

The bladeless fan 10 may be used for a variety of purposes. For example, it can be used in an HVAC setting for ventilation. It can also be used, notably, in the ceiling or rooftop of rooms or buildings having heat-generating equipment, such as industrial facilities or data centers, thereby forcing airflow in or out of rooms or buildings fluidly connected thereto.

By changing the form factor of the bladeless fan 10, the same type of bladeless fan 10 as described herein may be used in smaller environments. For example, it can be installed in electronics to evacuate heat, therefore forming an active heat sink inside the electronic device having no mechanical parts.

Turning to FIG. 3, there is illustrated a method for generating a directional flow of compressed gas for ventilation, the method comprising the following steps.

Step 1100: providing a source of compressed gas;

Step 1200: providing a chamber extending in a longitudinal direction, the chamber being closed, the chamber comprising a pressurized-gas inlet for receiving compressed gas, a wall defining a cylinder with a plurality of channels providing a fluid connection through the wall, the channels being located across a range of different longitudinal coordinates, and the wall being radially curved on itself to form a lumen therein adapted to receive jets of gas through the channels; and

Step 1300: injecting the compressed gas through the pressurized-gas inlet with an initial pressure which is sufficient to force a gas jet through the plurality of channels, high-pressure jets flowing through those being located close to the pressurized-gas inlet and lower pressure jets flowing through those at the farthest, thereby generating a pressure gradient along the wall in the lumen which generates the directional gas flow in the lumen.

FIG. 4 shows a top view of a bladeless fan 10 with cross-section lines used to determine the cross-section views of FIGS. 5 to 10 which show various possible profiles of the walls forming the ring-shaped chamber 300 and different embodiments of the rows of channels 210.

Referring to FIG. 5, a bladeless fan 20 according to an embodiment comprises a single row of channels 210, wherein the channels 210 extend radially and are located closer to the main-flow inlet 360 than to the main-flow outlet 370. Accordingly, a pressure gradient is generated between the channels 210 and the main-flow outlet 370 accelerating the airflow passing in the cylinder 200 toward the main-flow outlet 370. The channels 210 of the bladeless fan 20 have a circular cross-section.

Exemplary bladeless fan 20 further features a variable diameter in its longitudinal direction providing a particular airfoil profile to the inner face 102 delimiting the suctioned air passage 100. More particularly, the inner face 102 has an airfoil profile where a diameter of the suctioned air passage 100 near the main-flow inlet 360 is smaller than a diameter of the suctioned air passage near the main-flow outlet 370.

Referring to FIG. 6, another embodiment of a bladeless fan 30 comprises a single row of channels 210, wherein the channels 210 extend circumferentially, in other words perpendicularly to the longitudinal axis 150.

Referring to FIG. 7, another embodiment of a bladeless fan 40 comprises a single row of channels 210 having a direction comprising an inward constituent and an angular downstream constituent, aka a downstream angle which is greater than zero (0) degrees, directing the jets at least partially toward the main-flow outlet 370. According to an embodiment, the downstream angle is of one of at least 10 degrees, at least 20 degrees, at least 30 degrees, at least 40 degrees, at least 50 degrees, at least 60 degrees, at least 70 degrees, and at least 80 degrees.

Referring to FIG. 8, another embodiment of a bladeless fan 50 comprises a plurality of rows 220a-d of radial channels 210, wherein at least two rows, and preferably all rows 210a-d, are not aligned according to planes perpendicular to the longitudinal axis 150. According to a realization, the sizes of the passages, aka cross-section area of the channels 210 of the rows 220a-d increase as the rows 220a-d are farther from the main-flow inlet 360.

Referring to FIG. 9, another embodiment of a bladeless fan 60 comprises a single row of channels 210 oriented to generate a jet direction that is at an angle greater than zero (0) degrees, aka a swirling angle, relative to an axial plane based on the longitudinal axis 150.

Referring to FIG. 10, another embodiment of a bladeless fan 70 comprises a plurality of rows 220a-c of channels oriented to generate a jet direction that is at a swirling angle over 0 degrees from a plane based on the longitudinal axis 150. According to an embodiment, the swirling angles of the channels 210 decrease along with an increase of their axial coordinate. In other words, the swirling angle is greater for the row 220a (which is close to the main-flow inlet 360), than for the row 220c (which is farther from the main-flow inlet 360). According to an embodiment, the swirling angles of at least one channels 210 of a row 220a-c is one of at least 10 degrees, at least 20 degrees, at least 30 degrees and at least 40 degrees. Accordingly, the swirling path of the air along the inner face 102 increases the operative path of the inner face 102 (compared to a straight path) without increasing its physical length.

According to an embodiment, the channels 210 of at least one of the rows 220a-c have a downstream angle.

Referring to FIGS. 13A and 13B, the bladeless fan 10 may take many shapes according to various embodiments, each comprising a ring-shaped chamber 300 enclosed in the cylinder 200 of the bladeless fan 10. According to embodiments, the profile is an airfoil having a variable diameter and variable thickness. According to a preferred embodiment, the thickness of the profile is smaller about the main-flow inlet 360 (not identified), and afterward gradually increases and decreases to slowly end with its smallest thickness about the main-flow outlet 370 (not identified).

Referring to FIGS. 11 and 14, an embodiment of a bladeless fan assembly 400 (including a bladeless fan 10) is adapted to be mounted into an air duct 600, aka aeration duct of an HVAC system. The bladeless fan assembly 400 is mounted on the inner face 610 of the air duct 600. On FIG. 14, the bladeless fan assembly 400 is depicted distant from all walls of the air duct 600. In the embodiment of FIG. 11, the bladeless fan 10 is shown mounted after a direction change of the ducting, aka elbow, to accelerate the airflow in the air duct 600 thereafter.

According to an embodiment, the bladeless fan 10, and more precisely the external wall 240 of the bladeless fan 10, is mounted using a bracket 230, and preferably at least two brackets 230, and more preferably at least four brackets 230. Preferably, the brackets 230 have an airfoil or rain drop profile shape extending in the direction of the airflow, thereby minimizing their disturbance of the air flowing along the brackets 230.

The brackets 230 are adapted to have the bladeless fan 10 mounted about the inner face 610, with air upstream being able to travel in the cylinder 200 of the bladeless fan 10 and between the exterior of the bladeless fan 10 and the inner face 610.

The bladeless fan 10, as described before, is adapted to accelerate the airflow travelling in the cylinder 200, i.e., generate an accelerated airflow. The result is that the bladeless fan 10 also accelerates the surrounding airflow travelling between the exterior of the bladeless fan 10 and the inner face 610 thereby creating an entrained air flow. Since the accelerated airflow and the surrounding airflow interact, i.e., mix, downstream from the bladeless fan 10, the speed of resulting airflow is increased relative to the speed of the upstream airflow.

Referring to FIGS. 11 and 12, the bladeless fan 10 may be adapted to be driven with novel compressed gas fed from a source of compressed gas 500 located outside the ducting (see FIG. 11), or alternatively from compressed air collected from the upstream flow and compressed using one or more fans or impellers fed with air from one or more upstream inlets 232 (see FIG. 12).

According to embodiments, one previous solution may be better suited to a situation than the other based on the impact of the addition of new gas in the ducting and considering the characteristics of the new gas (e.g., nature, temperature, relative humidity, etc.).

While the embodiments above were described using terms such as upwardly, downwardly, bottom, top, etc., it should be noted that the apparatus may then be used in other directions such that the upward direction may become a lateral or downward direction, or any other intermediate direction. The apparatus was therefore described as if it was a chimney, as it appears natural to describe it in this direction, but the apparatus may be reoriented otherwise. However, orienting it to have an upward direction of the flow is advantageous as the apparatus may benefit from the ascending flow of warm air, hence accelerating an already existing upward flow of warm air. This orientation may therefore be beneficial for this reason when the apparatus is used to remove warm air from a location.

While preferred embodiments have been described above and illustrated in the accompanying drawings, it will be evident to those skilled in the art that modifications may be made without departing from this disclosure. Such modifications are considered as possible variants comprised in the scope of the disclosure.

Claims

1. A bladeless fan comprising: a ring-shaped chamber extending longitudinally and defining a suctioned air passage having a main-flow inlet and a main-flow outlet;a compressed-gas inlet adapted to receive compressed gas and to provide the compressed gas to the ring-shaped chamber; anda proximal row of channels radially distributed about the suctioned air passage wherein the channels provide a fluid connection for the compressed gas from the ring-shaped chamber to the suctioned air passage thereby generating a pressure differential along the suctioned air passage and forcing a flow of gas from the main-flow inlet to the main-flow outlet, further wherein the proximal row of channels is closer to the main-flow inlet than to the main-flow outlet, wherein the channels have a swirling angle greater than zero (0) degrees.

2. The bladeless fan of claim 1, wherein the ring-shaped chamber comprises an inner face having an airfoil profile where a diameter of the suctioned air passage near the main-flow inlet is smaller than a diameter of the suctioned air passage near the main-flow outlet.

3. The bladeless fan of claim 1, wherein the channels have a downstream angle greater than zero (0) degrees.

4. (canceled)

5. (canceled)

6. (canceled)

7. (canceled)

8. The bladeless fan of claim 1, further comprising an additional row of channels, wherein the additional row is located farther from the main-flow inlet than the proximal row of channels.

9. The bladeless fan of claim 8, wherein the compressed-gas inlet is closer to the proximal row of channels than to the additional row of channels.

10. The bladeless fan of claim 8, wherein the channels of the additional row have a cross-section area greater than the cross-section area of the channels of the proximal row.

11. The bladeless fan of claim 8, wherein the channels of the proximal row of channels have a first swirling angle, the channels of the additional row of channels have a second swirling angle, and the first swirling angle is greater than the second swirling angle.

12. The bladeless fan of claim 1, wherein the proximal row of channels comprises at least three channels distant from each other and where the at least three channels are within a gas inlet plane perpendicular to a longitudinal axis.

13. The bladeless fan of claim 1, wherein the proximal row of channels is longitudinally distant from the main-flow inlet.

14. The bladeless fan of claim 1, wherein the compressed-gas inlet is closer to the main-flow inlet than to the main-flow outlet.

15. The bladeless fan of claim 1, wherein the suctioned air passage has a cylindrical shape.

16. A bladeless fan assembly for accelerating a flow of gas in a lumen of a heating, ventilation, and air conditioning (HVAC) system, the lumen having an inner face, the bladeless fan assembly comprising: a ring-shaped chamber extending longitudinally and defining a suctioned air passage having a main-flow inlet and a main-flow outlet;a compressed-gas inlet adapted to receive compressed gas and to provide the compressed gas to the ring-shaped chamber;a proximal row of channels radially distributed about the suctioned air passage wherein the channels provide a fluid connection for the compressed gas from the ring-shaped chamber to the suctioned air passage thereby generating a pressure differential along the suctioned air passage and accelerating a first portion of the flow of gas from the main-flow inlet to the main-flow outlet; andat least one bracket adapted to mount the ring-shaped chamber to the inner face of the lumen of the HVAC system,

17. (canceled)

18. The bladeless fan assembly of claim 16, wherein the ring-shaped chamber has an inner wall delimiting the suctioned air passage and an external wall opposite the suctioned air passage, wherein the inner wall and the external wall form a cylindrically shaped airfoil.

19. The bladeless fan assembly of claim 16, further comprising a source of compressed gas connected to the compressed-gas inlet, wherein the source of compressed gas is located outside the lumen.

20. The bladeless fan assembly of claim 16, further comprising an upstream inlet located within the lumen, the upstream inlet being fed with compressed gas which in turn feeds the ring-shaped chamber.

21. A bladeless fan comprising: a ring-shaped chamber extending longitudinally and defining a suctioned air passage having a main-flow inlet and a main-flow outlet;a compressed-gas inlet adapted to receive compressed gas and to provide the compressed gas to the ring-shaped chamber; androws of channels radially distributed about the suctioned air passage wherein the channels provide a fluid connection for the compressed gas from the ring-shaped chamber to the suctioned air passage thereby generating a pressure differential along the suctioned air passage and forcing a flow of gas from the main-flow inlet to the main-flow outlet,

22. The bladeless fan of claim 21, wherein a proximal row of the rows of channels is closer to the main-flow inlet than to the main-flow outlet.

23. (canceled)

24. The bladeless fan of claim 21, wherein the ring-shaped chamber comprises an inner face having an airfoil profile where a diameter of the suctioned air passage near the main-flow inlet is smaller than a diameter of the suctioned air passage near the main-flow outlet.

25. The bladeless fan of claim 21, wherein the channels have a swirling angle greater than zero (0) degrees.

26. The bladeless fan of claim 21, further comprising a source of compressed gas connected to the compressed-gas inlet.

27. (canceled)

28. (canceled)