TECHNICAL FIELD
The present disclosure relates generally to HVAC (heating, ventilation and air-conditioning) systems and more specifically, to HVAC systems having arrangement of fusiform components.
BACKGROUND
Thermal comfort of occupants of a vehicle is of paramount importance due to the occupants' health and safety. In addition to that, with more stringent requirements of cost competitiveness, stringent emission norms, larger 'cabin volume/surface area' ratio, environmentally safe refrigerant and so forth, hybrid/electric vehicles are posing significant challenges to meet the occupants' thermal comfort. Air-conditioning system, the major source of thermal comfort for occupants of a vehicle, emerges as a primary source of annoyance in terms of acoustic comfort inside the vehicle. As vehicle manufacturers have tremendously improved upon powertrain noise, body leakage, aerodynamically shaped vehicle body, improved trim panel/liner and so forth, noise from HVAC systems becomes more perceivable as it involves a direct path to the occupants' ear. Furthermore, engineers have come up with many new ideas and design concepts like thin and compact fan, modified scroll design over past years to address the HVAC noise issues.
In one prior art solution, provided is an improved blower fan structure in which length of blades is increased and inlet and outlet angles of the blades are optimized for highly increasing an efficiency of the blower fan. Particularly, an outer diameter of the blades is more than or equal to two times of an inner diameter thereof, for increasing the efficiency without generating a noise.
In another prior art solution, provided are novel twisted blades with an air foil for use with air conditioner condensers and heat pumps that provide improved airflow efficiency to minimize operating power requirements having an overall diameter across the blades being approximately 19 inches, and approximately 27.6 inches. The blades (AC-A) can run at approximately 840 rpm to produce approximately 2200 cfm of air flow using approximately 110 Watts of power from an 8-pole motor. Using an OEM 6-pole V« hp motor produced approximately 2800 cfm with approximately 144 Watts of power while running the blades at approximately 1100 rpm. Power savings were 25% (50 W) over the conventional

configuration. A second version of the fan (AC-B) with some refinements to the flow geometry produced a similar air flow while using only 131 W of power at 1100 rpm. Power savings were 32% (62 W) over the conventional configuration. Embodiments can include two, three, four and five blades equally spaced apart from one another about hubs. Additionally, a novel noise reduction configuration can include asymmetrically mounted blades such as five blades asymmetrically mounted about the hub. Short, conical diffusers were shown to further improve air moving performance by up to 18% at no increase in power. Embodiments coupled with electronically commutated motors (ECMs) showed additional reductions to condenser fan power of approximately 20%.
In yet another prior art solution, provided is an invention comprising a hub adapted to rotate about a central axis. A centrifugal fan is provided that includes a plurality of blades arranged about a central axis and coupled to rotate with a hub. Each blade includes a bend in a plane extending through the blade, the plane abuts a cylinder extending through the blade and centered along a central axis.
However, none of the aforementioned prior art solutions enable to overcome problems associated increased drag and generation of noise during flow of fluid through HVAC systems.
Therefore, in light of the foregoing discussion, there exists a need to overcome various problems associated with conventional HVAC systems employing arrangement of a plurality of blades.
SUMMARY
The present disclosure seeks to provide a heating, ventilation and air-conditioning system having an arrangement of fusiform components.
According to an aspect, an embodiment of the present disclosure provides a heating, ventilation and air-conditioning system having an arrangement of fusiform components, the arrangement comprising:
- an inner annular ring;
- an outer annular ring arranged coaxially with the inner annular ring; and

- a plurality of fusiform components arranged between the inner annular ring and the outer annular ring, wherein a fusiform component of the plurality of fusiform components is arranged equidistant from another fusiform component of the plurality of fusiform components along the inner annular ring and wherein each fusiform component comprises:
- an inner section connected to the inner annular ring, wherein the inner section has a lens-shaped cross-section;
- an outer section connected to the outer annular ring, wherein the outer section has a lens-shaped cross-section identical to the lens-shaped cross-section of the inner section;
- a middle section connecting the inner section with the outer section, wherein the middle section has a wave-shaped cross-section and wherein the middle section is disposed at a predetermined angle with respect to the inner section and the outer section;
- a top straight edge connecting respective top vertices of the inner section, the middle section and the outer section, wherein the top straight edge is parallel to a horizontal plane;
- a bottom tapered edge connecting respective bottom vertices of the inner section, the middle section and the outer section, wherein the bottom tapered edge tapers from the bottom vertex of the inner section towards the bottom vertex of the middle section and from the bottom vertex of the outer section towards the bottom vertex of the middle section and wherein the bottom tapered edge is symmetrical from the inner section and the outer section towards the middle section; and
- aside corresponding to the top straight edge is fluid entry side of the fusiform and a side corresponding to the bottom tapered edge is fluid exit side of the fusiform.
Optionally, a thickness along a centre of the inner section and/or the outer section is in a range of 2 millimetres (mm) to 3 mm and wherein a length of the inner section and/or the outer section is in a range of 7 mm to 10 mm.
Optionally, a thickness along a centre of the middle section is in a range of 2 mm to 4 mm and wherein a length of the middle section is in a range of 14 mm to 18 mm.

Optionally, the middle section is disposed at a distance of 30 mm from a centre of the inner annular ring.
Optionally, each fusiform component is disposed in a twisted orientation in a clockwise direction or an anti-clockwise direction with respect to a vertical direction.
Optionally, a width of the fusiform component is in a range of 14 mm to 18 mm.
Optionally, each fusiform component of the plurality of fusiform components is disposed at an angle of 72° with respect to a preceding fusiform component of the plurality of fusiform components.
Optionally, a diameter of the inner annular ring is in a range of 14 mm to 18 mm and wherein a wall thickness of the inner annular ring is in a range of 1.5 mm to 2 mm.
Optionally, a diameter of the outer annular ring is in a range of 105 mm to 150 mm.
Optionally, an angle of the top and/or bottom vertex of the middle section with respect to a vertical direction is in a range of 10° to 15°.
It will be appreciated that features of the present disclosure are susceptible to being combined in various combinations without departing from the scope of the present disclosure as defined by the appended claims.
DESCRIPTION OF THE DRAWINGS
The summary above, as well as the following detailed description of illustrative embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the present disclosure, exemplary constructions of the disclosure are shown in the drawings. However, the present disclosure is not limited to specific methods and instrumentalities disclosed herein. Moreover, those in the art will understand that the drawings are not to scale. Wherever possible, like elements have been indicated by identical numbers.
Embodiments of the present disclosure will now be described, by way of example only, with reference to the following diagrams wherein:

FIG. 1 is an isometric view of an arrangement of fusiform components, in accordance with an embodiment of the present disclosure;
FIG. 2 is an isometric view of the arrangement shown in FIG. 1 without the outer annular ring, in accordance with an embodiment of the present disclosure;
FIG. 3 is a side view of the fusiform component shown in FIG. 1, in accordance with an embodiment of the present disclosure;
FIG. 4 is an isometric view of the fusiform component shown in FIG. 3, in accordance with an embodiment of the present disclosure;
FIG. 5 is a sectional-view of an inner section (such as the inner section shown in FIG. 3), in accordance with an embodiment of the present disclosure; and
FIG. 6 is a sectional-view of a middle section (such as the middle section shown in FIG. 3), in accordance with an embodiment of the present disclosure.
In the accompanying drawings, an underlined number is employed to represent an item over which the underlined number is positioned or an item to which the underlined number is adjacent. A non-underlined number relates to an item identified by a line linking the non-underlined number to the item. When a number is non-underlined and accompanied by an associated arrow, the non-underlined number is used to identify a general item at which the arrow is pointing.
DESCRIPTION OF EMBODIMENTS
In overview, embodiments of the present disclosure are concerned with heating, ventilation and air-conditioning system having arrangement of fusiform components.
According to an aspect, an embodiment of the present disclosure provides a heating, ventilation and air-conditioning system having an arrangement of fusiform components, the arrangement comprising:
- an inner annular ring;
- an outer annular ring arranged coaxially with the inner annular ring; and

- a plurality of fusiform components arranged between the inner annular ring and the outer annular ring, wherein a fusiform component of the plurality of fusiform components is arranged equidistant from another fusiform component of the plurality of fusiform components along the inner annular ring and wherein each fusiform component comprises:
- an inner section connected to the inner annular ring, wherein the inner section has a lens-shaped cross-section;
- an outer section connected to the outer annular ring, wherein the outer section has a lens-shaped cross-section identical to the lens-shaped cross-section of the inner section;
- a middle section connecting the inner section with the outer section, wherein the middle section has a wave-shaped cross-section and wherein the middle section is disposed at a predetermined angle with respect to the inner section and the outer section;
- a top straight edge connecting respective top vertices of the inner section, the middle section and the outer section, wherein the top straight edge is parallel to a horizontal plane;
- a bottom tapered edge connecting respective bottom vertices of the inner section, the middle section and the outer section, wherein the bottom tapered edge tapers from the bottom vertex of the inner section towards the bottom vertex of the middle section and from the bottom vertex of the outer section towards the bottom vertex of the middle section and wherein the bottom tapered edge is symmetrical from the inner section and the outer section towards the middle section; and
- a side corresponding to the top straight edge is fluid entry side of the fusiform and a side corresponding to the bottom tapered edge is fluid exit side of the fusiform.
Disclosed is a heating, ventilation and air-conditioning system (referred to as "HVAC system" throughout the present disclosure). The HVAC system can be used for providing a different temperature within an environment, such as, an increased or a decreased temperature as compared to a room temperature within the environment. In an example, the HVAC system can be implemented as an air-conditioning system installed within a

residential room. In such an example, the HVAC system can be used for reducing a temperature of the room from a normal temperature therein, to provide a comfortable and habitable temperature within the room.
It will be appreciated that the HVAC system can comprise a plurality of elements, including but not limited to, a HVAC unit comprising a cooling coil such as an evaporator, a heating coil such as a heater, blower or scroll housing with a fan and blower motor, one or more inlets (such as a recirculation inlet), one or more outlets, a filter, doors and the like. Furthermore, apart from the cooling unit and the heating unit, the HVAC system comprises a compressor, a condenser, and piping. Furthermore, a refrigerant (such as an eco-friendly, hydrochlorofluorocarbon-based (or HCFC-based) refrigerant) is allowed to flow through the HVAC system. Furthermore, the refrigerant undergoes one or more change in phase while flowing through the HVAC system, thereby, allowing the refrigerant to absorb heat from one environment (such as, within the room as mentioned herein above) and subsequently, exhaust the absorbed heat into another environment (such as, outside the room).
The HVAC unit has an arrangement of fusiform components. The term "fusiform component" as used throughout the present disclosure, relates to an arrangement of blade-like components. The fusiform component is placed before the fan at a suction side of HVAC unit allowing the fluid such as air to pass through the fusiform components. The air comes in contact with a leading edge of the fusiform component (the term "leading edge" as used throughout the present disclosure, relates to a side from which air enters into the fusiform component) and leaves from a trailing edge (the term "trailing edge" as used throughout the present disclosure, relates to a side from which air leaves the fusiform component) after crossing the fusiform component. Subsequently, the air enters into a blower scroll. It will be appreciated that one or more elements of the HVAC system can employ the arrangement of fusiform components. For example, the arrangement of fusiform components can be implemented before a condenser or radiator fan comprising a plurality of blades along a flow path of the air.
Referring now to FIG. 1, there is shown an isometric view of an arrangement 100 of fusiform components 102, in accordance with an embodiment of the present disclosure. The arrangement 100 comprises an inner annular ring 104. As shown, the inner annular ring 104 is implemented as a hollow-cylindrical structure that is arranged at a centre of the

arrangement 100. Furthermore, the inner annular ring 104 has a predetermined wall thickness. In one embodiment, a diameter of the inner annular ring 104 is in a range of 14 mm to 18 mm and wherein a wall thickness of the inner annular ring 104 is in a range of 1.5 mm to 2 mm. For example, the diameter of the inner annular ring 104 is 15 mm and the wall thickness of the inner annular ring 104 is 1.7 mm. In another example, the diameter of the inner annular ring 104 is 17 mm and the wall thickness of the inner annular ring 104 is 1.9 mm.
Furthermore, the arrangement 100 comprises an outer annular ring 106 arranged coaxially with the inner annular ring 104. The outer annular ring 106 is implemented as a ring-like structure having a predetermined wall thickness. The outer annular ring 106 is disposed coaxially with the inner annular ring 104 such that, the arrangement 100 of fusiform components and the outer annular ring 106 are disposed in a fixed orientation with respect to the inner annular ring 104. In an embodiment, a diameter of the outer annular ring 106 is in a range of 105 mm to 150 mm. For example, the diameter of the outer annular ring 106 is 120 mm. In another example, the diameter of the outer annular ring 106 is 145 mm.
It will be appreciated that a difference between the diameter of the inner annular ring 104 (such as, an external diameter thereof) and the diameter of the outer annular ring 106 (such as, an internal diameter thereof) corresponds to a length of each fusiform component 102. In one example, the difference between the diameter of the inner annular ring 104 and the diameter of the outer annular ring 106 is 91 mm (such that the diameter of the inner annular ring 104 is 14 mm and the diameter of the outer annular ring 106 is 105 mm). Consequently, the length of each fusiform component 102 is 91 mm. In an embodiment, a width of the fusiform component 102 is in a range of 14 mm to 18 mm. For example, the width of each fusiform component 102 is 16.5 mm.
Furthermore, the arrangement 100 comprises a plurality of fusiform components 102 arranged between the inner annular ring 104 and the outer annular ring 106. As shown, each fusiform component 102 is integrally formed with the inner annular ring 104 and the outer annular ring 106. Moreover, a fusiform component 102 of the plurality of fusiform components is arranged equidistant from another fusiform component 102 of the plurality of fusiform components along the inner annular ring 104. It will be appreciated that an imbalance in a centre of gravity of the arrangement 100 causes a disturbance in flow of air

passing through the fusiform components. Consequently, the fusiform component 102 of the plurality of fusiform components is arranged equidistant from another fusiform component 102 (such as a successive fusiform component 102 disposed along the inner annular ring 104), to enable the centre of gravity of the arrangement 100 to be positioned along an axis of rotation of the arrangement 100 (such that the axis of rotation of the arrangement 100 corresponds to axes of each of the inner annular ring 104 and the outer annular ring 106). Correspondingly, the positioning of the centre of gravity of the arrangement 100 along the centre axis of annular ring 104 enables proper balance in of the arrangement 100.
In one embodiment, each fusiform component 102 of the plurality of fusiform components is disposed at an angle of 72° with respect to a preceding fusiform component 102 of the plurality of fusiform components. For example, the arrangement 100 comprises 5 fusiform components disposed along the inner annular ring 104, such that consecutive fusiform components are disposed equidistantly from each other. In such an example, each fusiform component 102 of the plurality of fusiform components is disposed at the angle of 72° with respect to the preceding fusiform component 102 (or a successive fusiform component 102). It will be appreciated that such an angle between consecutive fusiform components 102 depends on a number of fusiform components disposed along the inner annular ring 104. For example, when the arrangement 100 comprises 6 fusiform components 102 such that each fusiform component 102 is disposed equidistantly from a preceding (or a successive) fusiform component 102, then the angle between consecutive fusiform components will be 60°. In another example, when the arrangement 100 comprises 9 fusiform components 102 such that each fusiform component 102 is disposed equidistantly from a preceding (or a successive) fusiform component 102, then the angle between consecutive fusiform components will be 40°.
Moreover, each fusiform component 102 comprises an inner section connected to the inner annular ring 104(shown in FIG. 3 herein later). The inner section has a lens-shaped cross-section (shown in FIG. 5 herein later). It will be appreciated that each fusiform component 102 of the plurality of fusiform components will have a portion that is coupled to (such as, formed integrally with) the inner annular ring 104. Such an inner section of each fusiform component 102 is fabricated to have the lens-shaped cross-section, such that the cross-section

of the inner section corresponds to two curved sides joined by tapering ends (or vertices) at a bottom side and straight ends at the top side thereof.
Furthermore, each fusiform component 102 comprises an outer section connected to the outer annular ring 106 (shown in FIG. 3 herein later). The outer section has a lens-shaped cross-section identical to the lens-shaped cross-section of the inner section. It will be appreciated that as with the inner section of each fusiform component 102 being coupled to (such as, formed integrally with) the inner annular ring 104, each fusiform component 102 comprises the outer section being coupled to (such as, formed integrally with) the outer annular ring 106. Furthermore, the outer section has that lens-shaped cross-section that is substantially similar (such as identical) to the lens-shaped cross-section of the inner section of the fusiform component 102. Alternatively, the outer section can have a cross-section that is different from the lens-shaped cross-section of the inner section of the fusiform component 102. However, the cross-section of the outer section (similar to the cross-section of the inner section) will correspond to an elongate cross-section instead of a uniform cross-section In one embodiment, a thickness along a centre of the inner section and/or the outer section is in a range of 2 millimetres (mm) to 3 mm and a length of the inner section and/or the outer section is in a range of 7 mm to 10 mm. It will be appreciated that, a mid-point of the curved sides of the lens-shaped portion will be connected by a middle-axis. Correspondingly, the thickness along the centre of the inner section and/or the outer section is in the range of 2 millimetres (mm) to 3 mm, such that the length of the middle-axis is in the range of 2 millimetres (mm) to 3 mm. In an example, the thickness (or the length of the middle-axis) along the centre of the inner section and/or the outer section is 2.5 mm. In another example, the thickness (or the length of the middle-axis) along the centre of the inner section and/or the outer section is 2.9 mm.
Furthermore, when each of the inner section and the outer section are fabricated to have the lens-shaped cross-section (as explained herein above), the inner section and the outer section will have an elongate axis connecting the tapering ends (or vertices) at the top side and the bottom side thereof. Correspondingly, a length of the inner section and/or the outer section or a length of the elongate axis connecting the tapering ends at the top side and the bottom side is in a range of 7 mm to 10 mm. For example, the length of the elongate axis is 7.5 mm. In another example, the length of the elongate axis is 9.5 mm.

Moreover, each fusiform component 102 comprises a middle section (shown in FIG. 3 herein later) connecting the inner section with the outer section. The middle section has a wave-shaped cross-section (shown in FIG. 6 herein later). As shown, the inner section and the outer section of each fusiform component 102 are connected by the middle section that is disposed substantially at a centre of a distance between the inner section and the outer section. In an embodiment, the middle section is disposed at a distance of 30 mm from a centre of the inner annular ring 104. Consequently, the middle section is disposed at a distance less than or equal to 30 mm from the inner section (as the inner annular ring 104 is fabricated to have a predetermined thickness and further has a hollow portion from the centre of the inner annular ring 104). For example, the middle section is disposed at a distance of 28 mm from the inner section. Optionally, middle section is disposed at the distance of 30 mm from outer inner annular ring 106. Consequently, the middle section is disposed at a distance less than or equal to 30 mm from the outer section (as the outer annular ring 106 is fabricated to have a predetermined thickness). For example, the middle section is disposed at a distance of 29 mm from the outer section.
Furthermore, the middle section has the wave-shaped cross-section, such that the cross-section of the middle section has a depression followed by a crest. The depression and the crest are fabricated between two tapering ends (or vertices) of the middle portion. Moreover, each of the depression and the crest of the middle portion can be fabricated to have substantially same dimensions (such as, a length from one end to another end thereof). In an embodiment, a thickness along a centre of the middle section is in a range of 2 mm to 4 mm and a length of the middle section is in a range of 14 mm to 18 mm. The thickness of the middle section corresponds to a distance between sides of the middle section where the depression meets the crest. In an example, the thickness (or the distance between sides of the middle section where the depression meets the crest) is 3 mm. Furthermore, the length of the middle section corresponds to a distance between the tapering ends (or vertices) of the middle section. In one example, the length of the middle section is 16 mm.
Moreover, the middle section is disposed at a predetermined angle with respect to the inner section and the outer section. The middle portion of each fusiform component 102 can be disposed at a non-zero angle with respect to the inner section and the outer section, such that the middle portion is rotated counter-clockwise by a predetermined angle with respect to the

leading flow side of fusiform components 102. Such a predetermined angle of the middle section with respect to the inner section and the outer section causes each fusiform component 102 to have a "twisted" form factor. In one embodiment, each fusiform component 102 is disposed in a twisted orientation in a counter-clockwise direction with respect to the leading edge. For example, the inner section, the middle section and the outer section are disposed such that the fusiform component 102 has a clockwise twisted form factor about a horizontal axis. In such an example, the arrangement 100 can be employed in a CW (or clockwise) condenser. In another example, the inner section, the middle section and the outer section are disposed such that the fusiform component 102 has an anti¬clockwise twisted form factor about the horizontal axis. In such an example, the arrangement 100 can be employed in a CCW (or counter-clockwise) condenser. Furthermore, a twisting of the fusiform component depends on the rotation direction of the fan, such that, if the fan is rotating in the clockwise direction, then the twisting has to be in the clockwise direction but if the fan is rotating in the counter-clockwise, the twisting of the fusiform component has to be in the counter-clockwise direction. In one embodiment, an angle of the top and/or bottom vertex of the middle section with respect to a vertical direction is in a range of 10° to 15°. For example, the angle of the top and/or bottom vertex of the middle section with respect to the vertical direction is 13°. In such an example, the fusiform component 102 will have the twisted form factor, such that an angle of twist corresponds to 13°.
Furthermore, each fusiform component 102 comprises a top straight edge (shown in FIG. 3 herein later) connecting respective top vertices of the inner section, the middle section and the outer section. The top straight edge is parallel to a horizontal plane. The top straight edge is fabricated to be substantially linear. The top straight edge connects the respective top vertices of the inner section, the middle section and the outer section. Moreover, each fusiform component 102 comprises a bottom tapered edge (shown in FIG. 3 herein later) connecting respective bottom vertices of the inner section, the middle section and the outer section. The bottom tapered edge tapers from the bottom vertex of the inner section towards the bottom vertex of the middle section and from the bottom vertex of the outer section towards the bottom vertex of the middle section. The bottom tapered edge is symmetrical from the inner section and the outer section towards the middle section. The bottom tapered edge is fabricated to be substantially V-shaped, such that a vertex of the V-shape of the bottom tapered edge is located corresponding to the bottom vertex of the middle section.

Furthermore, a length of the bottom tapered edge from the bottom vertex of the middle section to the bottom vertex of the inner section is substantially same (such as, within 95%) to a length of the bottom tapered edge from the bottom vertex of the middle section to the bottom vertex of the outer section.
Moreover, a side corresponding to the top straight edge (shown by arrow 108) is air entry side of the fusiform and a side corresponding to the bottom tapered edge (such as a side opposite to the one shown by arrow 108, not shown) is fluid exit side of the fusiform component 102.
Referring to FIG. 2, there is shown an isometric view of the arrangement 100 shown in FIG. 1 without the outer annular ring 106, in accordance with an embodiment of the present disclosure.
Referring now to FIG. 3, there is shown a top view of the fusiform component 102 shown in FIG. 1, in accordance with an embodiment of the present disclosure. As shown, the fusiform component 102 comprises the inner section 302, the outer section 304, the middle section 306 connecting the inner section with the outer section, the top straight edge 308connecting respective top vertices of the inner section 302, the middle section 306 and the outer section 304 (such that the top straight edge 308 is parallel to the horizontal plane) and the bottom tapered edge 310 connecting respective bottom vertices of the inner section 302, the middle section 306 and the outer section 304. As shown, the bottom tapered edge 310 tapers from the bottom vertex of the inner section 302 towards the bottom vertex of the middle section 306 and from the bottom vertex of the outer section 304 towards the bottom vertex of the middle section 306. The bottom tapered edge 310 is symmetrical from the inner section 302 and the outer section 304 towards the middle section 306 and consequently, the bottom tapered edge 310 is fabricated to be substantially V-shaped.
Referring to FIG. 4, there is shown an isometric view of the fusiform component 102 shown in FIG. 3, in accordance with an embodiment of the present disclosure. As shown, the inner section 302 has the lens-shaped cross-section and the outer section 304 has the lens-shaped cross-section identical to the lens-shaped cross-section of the inner section 302. Moreover, the middle section 306 has the wave-shaped cross-section and the middle section 306 is

disposed at the predetermined angle with respect to the inner section 302 and the outer section 304.
The twisted form factor of each fusiform component 102 of the plurality of fusiform components allows fluid (such as air) to flow through the arrangement 100 such that the fluid follows the twisted form factor of the fusiform component 102 (such as, flows along a surface of the fusiform component 102 having the twisted form factor) while flowing from one side to another side of fusiform component 102.
The rotation of fan blades imparts kinetic energy to the air in a form of a velocity change which produces airflow and pressure difference. The inlet flow accelerates in two steps: in a first step, when the air turns radially to enter the impeller blades and in a second step when the moving blades impose a tangential force. Consequently, there is a change in static pressure. Furthermore, interaction of inlet flow with the airflow around the blades causes fluctuating shear stress which produces sound pressure level. Typically, the flow field is spatially non-uniform and non-homogenous due to strong change of the flow velocity vector as a result of non-uniform shape and geometry of the suction side. Correspondingly, due to this fluctuation, the strong turbulent boundary layer and flow separation generates noise. Alternatively, the non-homogeneity of flow, once it gets induced by the fan, creates randomness at the entry which interacts with the fan and aggravates the noise generation. Consequently, an amount of energy required to cause the fluid to flow through the arrangement 100 is substantially decreased, thereby, overcoming various problems associated with conventional fans having flat-blades and no fusiform type structure. Furthermore, the arrangement 100 of fusiform components experiences reduced turbulence instabilities, shear stress and/or vortex rolling as compared to conventional arrangements having flat blades and no fusiform like structure, thereby, increasing an operating life of the arrangement 100 and reduce the HVAC unit flow noise.
FIG. 5 is a sectional-view of an inner section 500 (such as the inner section 302 shown in FIG. 3), in accordance with an embodiment of the present disclosure. As shown, the inner section 500 has a lens-shaped cross-section.

FIG. 6 is a sectional-view of a middle section 600 (such as the middle section 306 shown in FIG. 3), in accordance with an embodiment of the present disclosure. As shown, the middle section 600 has a wave-shaped cross-section.
In operation, flow of air from an inlet of the system and towards the arrangement 100 is channelled smoothly towards the plurality of fusiform components 102. Optionally, the flow is smoothly guided by each side (such as a top side and a bottom side) of the arrangement 100. Subsequently, as the air enters the scroll of the system, the flow is smooth and uniform and consequently, turbulence instabilities, shear stress and/or vortex rolling are reduced. Moreover, secondary flow is minimized across the plurality of fusiform components 102. Therefore, randomness associated with the flow of air through the arrangement 100 is reduced. It will be appreciated that such a reduction in the randomness associated with the flow enables to minimize noise generated due by the flow and thus, the arrangement 100 enables to minimize the noise associated with operation of HVAC systems.
Modifications to embodiments of the invention described in the foregoing are possible without departing from the scope of the invention as defined by the accompanying claims. Expressions such as "including", "comprising", "incorporating", "consisting of, "have", "is" used to describe and claim the present invention are intended to be construed in a non-exclusive manner, namely allowing for items, components or elements not explicitly described also to be present. Reference to the singular is also to be construed to relate to the plural. Numerals included within parentheses in the accompanying claims are intended to assist understanding of the claims and should not be construed in any way to limit subject matter claimed by these claims.

We Claims

1. A heating, ventilation and air-conditioning system having an arrangement of fusiform components, the arrangement comprising:
- an inner annular ring;
- an outer annular ring arranged coaxially with the inner annular ring; and
- a plurality of fusiform components arranged between the inner annular ring and the outer annular ring, wherein a fusiform component of the plurality of fusiform components is arranged equidistant from another fusiform component of the plurality of fusiform components along the inner annular ring and wherein each fusiform component comprises:

- an inner section connected to the inner annular ring, wherein the inner section has a lens-shaped cross-section;
- an outer section connected to the outer annular ring, wherein the outer section has a lens-shaped cross-section identical to the lens-shaped cross-section of the inner section;
- a middle section connecting the inner section with the outer section, wherein the middle section has a wave-shaped cross-section and wherein the middle section is disposed at a predetermined angle with respect to the inner section and the outer section;
- a top straight edge connecting respective top vertices of the inner section, the middle section and the outer section, wherein the top straight edge is parallel to a horizontal plane;
- a bottom tapered edge connecting respective bottom vertices of the inner section, the middle section and the outer section, wherein the bottom tapered edge tapers from the bottom vertex of the inner section towards the bottom vertex of the middle section and from the bottom vertex of the outer section towards the bottom vertex of the middle section and wherein the bottom tapered edge is symmetrical from the inner section and the outer section towards the middle section; and

- a side corresponding to the top straight edge is fluid entry side of the fusiform and a side corresponding to the bottom tapered edge is fluid exit side of the fusiform.
2. The heating, ventilation and air-conditioning system as claimed in claim 1, wherein a thickness of fusiform along a centre of the inner section and/or the outer section is in a range of 2 millimetres (mm) to 3 mm and wherein a length of the inner section and/or the outer section is in a range of 7 mm to 10 mm.
3. The heating, ventilation and air-conditioning system as claimed in claim 1, wherein the thickness of fusiform along a centre of the middle section is in a range of 2 mm to 4 mm and wherein a length of the middle section is in a range of 14 mm to 18 mm.
4. The heating, ventilation and air-conditioning system as claimed in claim 1, wherein the middle section of fusiform is disposed at a distance of 30 mm from a centre of the inner annular ring.
5. The heating, ventilation and air-conditioning system as claimed in claim 1, wherein each fusiform component is disposed in a twisted orientation in a clockwise direction or an anti¬clockwise direction with respect to a vertical direction.
6. The heating, ventilation and air-conditioning system as claimed in claim 1, wherein a width of the fusiform component is in a range of 14 mm to 18 mm.
7. The heating, ventilation and air-conditioning system as claimed in claim 1, wherein each fusiform component of the plurality of fusiform components is disposed at an angle of 72° with respect to a preceding fusiform component of the plurality of fusiform components.
8. The heating, ventilation and air-conditioning system as claimed in claim 1, wherein a diameter of the inner annular ring of the fusiform is in a range of 14 mm to 18 mm and wherein a wall thickness of the inner annular ring is in a range of 1.5 mm to 2 mm.
9. The heating, ventilation and air-conditioning system as claimed in claim 1, wherein a diameter of the outer annular ring of the fusiform is in a range of 105 mm to 150 mm.

10. The heating, ventilation and air-conditioning system as claimed in claim 1, wherein an angle of the top and/or bottom vertex of the middle section with respect to a vertical direction is in a range of 10° to 15° of the fusiform components.