Air diffuser for flush mounting with ceiling utilizing coanda effect

Abstract

The present invention relates to an air diffuser (1) configured for flush mounting with a ceiling (6), utilizing the Coanda effect for optimal airflow distribution and efficient room climatization. The air diffuser (1) comprises an outer diffuser housing (5), an inner deflector (2) with a multi-angled shape, and an adjustable outer deflector (3) with a multi-concave inner surface (3a) facing the inner deflector (2). An air outflow path (A) is formed between the deflectors (2, 3), wherein the outflow air undergoes multiple deflections to control air velocity, pressure, and flow direction. The outflow air is directed horizontally along the ceiling (6) of the room (7) through the air outlet (4), utilizing the Coanda effect to ensure the airflow remains attached to the ceiling (6).

Description

[0001] Air Diffuser for Flush Mounting with Ceiling Utilizing Coanda Effect

[0002] Field of the Invention

[0003] The present invention relates to an air diffuser, specifically configured for flush mounting with the ceiling of a room. More particularly, the invention pertains to an air diffuser that utilizes the Coanda effect to optimize airflow distribution and enhance climatization efficiency within a room.

[0004] Background of the Invention

[0005] In modern building ventilation systems, air diffusers play a crucial role in distributing conditioned air to maintain indoor comfort and air quality. Traditional air diffusers often face challenges in achieving uniform airflow distribution and efficient room climatization without compromising aesthetic integration with the ceiling.

[0006] Traditionally, air supply and exhaust functions are handled by separate diffusers within a ventilation system, which not only increases installation complexity and costs but also occupies more space. These systems often struggle with the interference between supply and exhaust airflows, leading to decreased efficiency and effectiveness.

[0007] One common issue with many existing air diffusers is their tendency to produce concentrated downward airflows, leading to discomfort for room occupants and inefficient air distribution. Earlier designs have employed fixed deflectors and simple geometric configurations, which limit their ability to efficiently control the direction and velocity of the air.

[0008] Many of these designs fail to leverage advanced aerodynamic principles like the Coanda effect. The Coanda effect is a fluid dynamics phenomenon where a fluid jet (such as air or liquid) tends to stay attached to a convex surface rather than following a straight path when directed near that surface. This effect, named after Romanian aerodynamics pioneer Henri Coanda, can significantly enhance airflow distribution by directing air along surfaces rather than allowing it to disperse freely into the room.

[0009] Moreover, many prior art solutions lack the ability to adjust diffuser components to fine-tune airflow characteristics. This limitation restricts their adaptability to different room sizes and ventilation requirements, resulting in suboptimal performance in various settings. Without adjustable components, these diffusers cannot dynamically control air velocity and pressure, leading to inconsistent and inefficient room climatization.

[0010] Some air diffuser systems, such as those illustrated by the Samsung 360 model, incorporate numerous mechanical components to manipulate airflow direction. These systems not only increase the complexity and cost of air diffusers but also elevate energy consumption due to their reliance on active mechanical adjustments. Furthermore, these solutions often require visible external elements to achieve desired airflow patterns, which can detract from the aesthetic and practical integration within a space.

[0011] Thus, there is a need for an improved air diffuser that overcomes these limitations by utilizing the Coanda effect and offering adjustable components to optimize airflow distribution, ensuring both aesthetic integration and efficient room climatization.

[0012] Summary of the Invention

[0013] The present invention addresses the foregoing need by providing an improved air diffuser as defined in independent claim 1 , with additional advantageous embodiments detailed in dependent claims 2 through 14.

[0014] Specifically, an air diffuser according to the present invention is an air diffuser configured for flush mounting with a ceiling of a room, comprising: an outer diffuser housing; an inner deflector disposed within the outer diffuser housing, having a multi-angled shape; an outer deflector, movably mounted to the inner surface of the outer diffuser housing, said outer deflector having a multi-concave shape at its inner surface facing the inner deflector; an air outflow path formed at least partially between the inner deflector and the outer deflector, wherein outflow air is subjected to multiple deflections along the air outflow path; and an air outlet through which the outflow air ejects horizontally along the ceiling of the room, utilizing the Coanda effect to maintain the airflow attachment to the ceiling. A position of the outer deflector relative to the inner deflector is adjustable to control air velocity, pressure, and flow direction along the air outflow path to achieve the Coanda effect.

[0015] The air diffuser utilizes the Coanda effect, directing airflow along the ceiling for even distribution and preventing uncomfortable downward airflows. The position of the outer deflector is adjustable, allowing precise control of air velocity, pressure, and flow direction. This adjustability ensures optimal performance in various room sizes and ventilation needs. Along the air outflow path, the outflow air is subjected to multiple deflections, enhancing control of airflow velocity and pressure.

[0016] Configured for flush mounting, the diffuser integrates aesthetically with the ceiling, eliminating unsightly protrusions. This configuration improves indoor comfort and air quality while maintaining a clean appearance. The adjustable outer deflector adapts to different room configurations, making the diffuser versatile for residential and commercial applications. The efficient air distribution reduces energy consumption by easing the load on heating and cooling systems.

[0017] The air diffuser according to the present invention represents a significant advancement over existing technologies by streamlining the airflow direction mechanism and eliminating the reliance on multiple visible mechanical components. This air diffuser employs a meticulously engineered geometric design to harness the Coanda effect with enhanced efficiency, securing robust airflow adherence to surfaces without the increased energy consumption typically associated with complex mechanical setups found in current models, such as the Samsung 360. By reducing mechanical complexity, this design not only lowers energy costs but also minimizes maintenance requirements, providing a sleek, integrated unit that blends seamlessly with its environment.

[0018] In summary, the air diffuser offers improved airflow distribution, adjustability, and aesthetic integration, overcoming the limitations of traditional designs by leveraging the Coanda effect and providing a versatile, efficient solution.

[0019] In a preferred embodiment of the present invention, the outer deflector has two concave segments between which a projection is formed, projecting inwardly towards the inner deflector.

[0020] The two concave segments and the interposed inwardly projecting projection of the outer deflector enable precise control of pressure, velocity, and direction of the outflow air. This configuration facilitates the Coanda effect as air exits the outlet, ensuring uniform air distribution within the room, minimizing turbulence, and reducing operational noise.

[0021] In a further preferred embodiment of the present invention, an end section of the inner deflector leading to the air outlet has an approximately L-shaped configuration in a vertical cross-sectional view through the diffuser, with the corner of this L-shaped configuration provided with an inwardly stepped recess. The inwardly stepped recess advantageously allows for additional deflections of the outflow air along the air outflow path. These deflections regulate the pressure, velocity, and direction of the outflow air at the air outlet, preventing vertical air ejection and instead promoting the Coanda effect, ensuring that the airflow adheres to and follows along the ceiling.

[0022] In a further development of the above embodiment of the present invention, the recess at the corner of the inner deflector comprises an inclined surface that extends further outward as it approaches the air outlet.

[0023] The provision of an inclined surface extending further outward as it approaches the air outlet directs the outflow air outward. This, in conjunction with the low pressure and high velocity of the outflow air at the air outlet, effectively promotes the Coanda effect and inhibits vertical air dispersion from the diffuser. The configuration ensures a more efficient attachment of the airflow to the ceiling, leading to improved air distribution and comfort within the room.

[0024] In a particularly preferred embodiment of the present invention, the projection of the outer deflector projects towards the inclined surface of the recess of the inner deflector.

[0025] This configuration enhances flow control by creating a more complex path for the outflow air, allowing better regulation of air pressure and velocity. The projection and inclined surface work together to direct airflow more precisely, resulting in efficient and effective control of air pressure and velocity to create the Coanda effect at the air outlet.

[0026] A particularly preferred embodiment of the air diffuser is capable of performing both air supply and exhaust functions through a single integrated unit, wherein the diffuser utilizes an internal geometric configuration that, coupled with the Coanda effect, prevents the mixing of supply and exhaust airflows.

[0027] This innovative diffuser consolidates air supply and exhaust capabilities into a single unit, leveraging a sophisticated geometric design and the Coanda effect to prevent the mixing of incoming and outgoing air streams. By integrating both functionalities, this design significantly reduces the need for separate units, thereby decreasing production and installation costs. Furthermore, this integration simplifies maintenance and enhances aesthetic conformity with the environment, making it an ideal solution for modern spaces seeking both functional efficiency and visual minimalism.

[0028] In a further advantageous embodiment of the present invention, the air diffuser further comprises an inner diffuser body disposed within the inner deflector, with an air inflow path formed between opposing wall surfaces of the inner diffuser body and the inner deflector, beginning at an air inlet through which inflow air is sucked from the room into the diffuser.

[0029] Hence, the air diffuser performs a dual function: sucking contaminated, fresh or hot air from the room and ejecting clean, hot or fresh air back into the room in a circular airflow. The air outflow path is separated by the inner deflector from the air inflow path, ensuring that the two paths do not negatively affect each other. This configuration allows for precise vertical air inflow control through the air inlet while directing air outflow in a 90-degree outward bend at the air outlet, thereby enhancing the Coanda effect and promoting efficient air circulation.

[0030] In this context, it is particularly preferred that the inner diffuser body has an approximately L-shaped configuration in a vertical cross-sectional view through the diffuser, and is aligned concentrically with the inner deflector such that the opposing wall surfaces of the inner diffuser body and the inner deflector delimiting the air inflow path extend approximately parallel to each other.

[0031] Thus, contrary to the flow conditions along the air outflow path, the flow conditions (air pressure, air velocity, flow direction) along the air inflow path remain relatively stable. Consequently, the inflow air can be sucked in a vertical direction through the air inlet, ensuring a stable and efficient air intake process. This separation of air inflow and outflow paths minimizes turbulence and interference, enhancing the overall performance of the air diffuser in maintaining consistent and controlled airflow within the room.

[0032] A further advantageous development involves the inner diffuser body having a horizontal wall section whose lower surface is configured to extend at the same height as the lower surface of the ceiling to achieve a flush mounting of the diffuser in the ceiling.

[0033] This air diffuser, featuring the flush mounting of its inner diffuser body to the ceiling, offers several advantages: seamless aesthetic integration, improved airflow distribution through the Coanda effect, reduced noise due to decreased turbulence, easier maintenance, and enhanced heating, ventilation, and air conditioning (HVAC) efficiency by minimizing airflow resistance.

[0034] In yet a further preferred embodiment of the present invention, three subsequent deflections are imparted on the outflow air along the air outflow path between the inner deflector and the outer deflector, including: from a horizontal flow direction to a vertical flow direction; from the vertical flow direction back to a horizontal flow direction; and finally from the horizontal flow direction back to a vertical flow direction. The three subsequent deflections reduce air pressure and increase air velocity. This ensures the outflow air at the air outlet avoids freely dispersing into the room, which has a free air pressure at least equal to the outflow air pressure at the air outlet. This promotes horizontal propagation along the ceiling utilizing the Coanda effect, thereby enhancing efficient air distribution and minimizing turbulence.

[0035] Further, it is preferred that the outer deflector has a horizontal wall section at its end directed away from the air outlet, with a lower wall surface of this horizontal wall section extending parallel to an upper wall surface of a horizontal wall section of the inner deflector.

[0036] The parallel arrangement of the horizontal wall sections of the outer and inner deflectors at the beginning of the air outflow path enhances flow stability by minimizing disturbances and maintaining a consistent flow path. This configuration ensures subsequent controlled deflections, which are crucial for managing air pressure and velocity. These controlled deflections lead to effective air distribution and promote the Coanda effect by keeping the airflow attached to the ceiling.

[0037] A further preferred embodiment allows for vertical and / or horizontal adjustability of the outer deflector through mechanical means such as screws, slides, or other fastening mechanisms connecting the outer deflector to the outer diffuser housing.

[0038] This adjustability provides several key benefits. First, it enables precise control over the airflow direction, air pressure, and air velocity, allowing for customized air distribution within the room. This can enhance occupant comfort by directing air where it is most needed and avoiding drafts. Second, the ability to fine-tune the position of the outer deflector allows for optimal performance in various room sizes and layouts, ensuring efficient and gentle room climatization.

[0039] Preferably, it may be envisaged that the outer deflector is a hollow injection-molded plastic part.

[0040] This feature offers several advantages: lightweight construction, cost-effective production, enhanced durability, and design flexibility. Additionally, it provides thermal insulation, reducing unwanted heat transfer, and noise reduction, ensuring quieter operation and improved comfort for room occupants. The hollow structure also facilitates integration of additional airflow control mechanisms, enhancing overall functionality. Furthermore, it is preferred that the air outlet be formed between a vertically extending segment of the inner deflector and a vertically extending segment of the outer diffuser housing.

[0041] The formation of such an outlet allows the air outlet to be flush with the ceiling surface, enabling seamless integration into the ceiling design. This configuration maintains aesthetic appeal and enhances airflow distribution by utilizing the Coanda effect, ensuring that the air remains attached to the ceiling for efficient and comfortable room climatization.

[0042] Brief Description of the Drawings

[0043] Further features and advantages of the present invention will become apparent from the following description of preferred embodiments, in connection with the accompanying drawings, in which:

[0044] Fig. 1 shows a vertical cross-sectional view of an air diffuser according to the present invention, integrated into an air conditioning system, including the heating / cooling coil, the fan, the air filter, and the air diffuser.

[0045] Fig. 2 shows an enlarged detail of the vertical cross-sectional view of the air diffuser shown in Fig. 1 , highlighting the course of the air outflow path and air inflow path.

[0046] Fig. 3 shows pressure contours (isobars) within the air diffuser detail shown in Fig. 2, illustrating lines of equal pressure along the air outflow and inflow paths, with different shadings indicating varying pressure values as represented on the shading scale to the right.

[0047] Fig. 4 shows velocity contours within the air diffuser detail shown in Fig. 2, illustrating the variation of air velocity along the air outflow path, with different shadings indicating varying velocity magnitudes as represented on the shading scale to the right.

[0048] Detailed Description of the Drawings

[0049] A preferred embodiment of the air diffuser 1 is described below with reference to Figs. 1 to 4. The directional terms "outer" and "outward", and "inner" and "inward" refer to the central axis C of the air diffuser 1 , as shown in Fig. 1. The terms "outer" and "outward" mean directed away from the central axis C, while the terms "inner" and "inward" mean directed closer to the central axis C. The directional terms "lower", "upper", "horizontal", and "vertical" refer to the mounting state of the air diffuser 1 when it is flushly integrated into the ceiling 6 of the room 7, as shown in Figs. 1 to 4.

[0050] Fig. 1 shows a schematic vertical cross-sectional view of an air diffuser 1 according to the present invention, forming part of an air conditioning system 10. The visible components include the heating / cooling coil 11 , the fan 12, the air filter 13, and the air diffuser 1 according to the present invention, which distributes air into the room 7 to be climatized. The air diffuser 1 , configured for flush mounting with the ceiling 6, includes an outer diffuser housing 5, a multi-angled inner deflector 2, and a movable, multi-concave outer deflector 3. An air outflow path A between the deflectors 2 and 3 subjects the outflow air to multiple deflections. The air outlet 4, formed between a vertically extending segment of the inner deflector 2 and a vertically extending segment of the outer diffuser housing 5, ejects the outflow air horizontally along the ceiling 6 of the room 7, utilizing the Coanda effect to maintain airflow attachment to the ceiling 6. The position of the outer deflector 3 relative to the inner deflector 2 is adjustable to control air velocity, pressure, and flow direction along the air outflow path A to achieve the Coanda effect.

[0051] The flush-mounted air diffuser 1 integrates aesthetically with the ceiling 6 and optimizes airflow using the Coanda effect. The adjustable outer deflector 3 controls air velocity, pressure, and flow direction. Inflow air enters through the air inlet 9, passes through the filter 13, fan 12, and heating / cooling coil 11 , and exits through the air outlet 4. Adjusting the outer deflector 3 varies the ejection angle, allowing the air to flow along the ceiling 6 and evenly distribute within the room 7.

[0052] The air diffuser 1 further comprises an inner diffuser body 8 within the inner deflector 2, forming the air inflow path B between the opposing wall surfaces of the inner diffuser body 8 and the inner deflector 2, beginning at the air inlet 9. As illustrated in Fig. 2, the inner diffuser body 8 has an L-shaped configuration in a vertical cross-sectional view through the diffuser 1 and is aligned concentrically with the inner deflector 2, such that the opposing wall surfaces of the inner diffuser body 8 and the inner deflector 2 delimiting the air inflow path B extend approximately parallel to each other. The inner diffuser body 8 has a horizontal wall section 8a, with its lower surface configured to extend at the same height as the lower surface of the ceiling 6, achieving flush mounting of the diffuser 1 in the ceiling 6.

[0053] Hence, the air diffuser 1 features an advanced geometric design that precisely manipulates airflow dynamics to segregate incoming used air from outgoing fresh air. This design not only prevents the intermingling of exhaust and supply airflows but also harnesses a robust Coanda effect. This effect ensures strict adherence of each air stream to its designated path -air outflow path A for supply and air inflow path B for exhaust - thus eliminating crosscontamination and optimizing aerodynamic efficiency.

[0054] The core of the invention lies in the adjustable position of the outer deflector 3 relative to the inner deflector 2, which regulates air velocity, pressure, and flow direction along the air outflow path A to achieve the Coanda effect. The interaction between the outer deflector 3 and the inner deflector 2 creates a high-low pressure difference that directs the airflow along the air outflow path A. When the outer deflector 3 is raised, the high-low pressure difference decreases, allowing the airflow to change direction by 90 degrees at the air outlet 4. Fully lowering the outer deflector 3 maximizes the Coanda effect, as shown in Figs. 1 to 4, causing the airflow to move horizontally along the ceiling 6, effectively creating a 90-degree turn at the air outlet 4 from the vertical flow. Raising the outer deflector 3 to an intermediate position adjusts the air ejection angle to 45 degrees, which reduces or potentially nullifies the Coanda effect. This adjustability enables the air diffuser 1 to adapt to various room configurations and ventilation needs, ensuring optimal performance and efficient air distribution across different room sizes and layouts.

[0055] The precise alignment and interaction of the inner curvatures of the outer deflector 3 and the outer curvatures of the inner deflector 2 are essential for creating the desired pressure profile. Even minor deviations in the shape and placement of these details can significantly diminish the Coanda effect, leading to increased noise and turbulence, which can adversely affect the comfort and efficiency of the air conditioning system 10. To ensure continuous and efficient room climatization, the air inflow path B and air outflow path A are strategically designed to link over the fan 12, creating a streamlined air circulation system.

[0056] Unlike conventional air diffusers that often protrude noticeably from mounting surfaces and reveal internal components, this invention offers a seamless and ultra-minimalistic design. The air diffuser 1 is engineered to sit flush with the ceiling 6, extending minimally or not at all from the mounting surface to preserve the room's aesthetic appeal while optimizing functional performance. This design not only ensures superior visual integration into various architectural styles but also promotes efficient and energy-effective air distribution. It achieves this by leveraging the Coanda effect to enhance airflow dynamics, facilitating smoother and more controlled air delivery.

[0057] In Fig. 3, the vertical elements labeled as planes D and E are depicted as vertical banks located at the termination of the air outlet 4. These banks are designed to not only meet aesthetic market demands but also to enhance functional airflow dynamics. Although vertically oriented, these elements are critical in channeling the outflow air to move horizontally along the ceiling 6, effectively utilizing the Coanda effect to optimize airflow distribution. This design ensures that the air, in alignment with planes D and E, undergoes a deliberate change in direction, facilitating a smooth horizontal flow across the ceiling surface. This dynamic airflow management enhances occupant comfort and maximizes the aerodynamic performance of the air diffuser 1.

[0058] Fig. 2 shows an enlarged detail of the vertical cross-sectional view of the air diffuser 1 depicted in Fig. 1 , highlighting the specific components and airflow paths A and B within the air diffuser 1. Again represented by a vertical double arrow, the vertical position of the outer deflector 3 relative to the inner deflector 2 is precisely adjustable to control air velocity, pressure, and flow direction along the air outflow path A, effectively achieving the Coanda effect.

[0059] The inner deflector 2, near the air outlet 4, has an approximately L-shaped configuration with an inwardly stepped recess 2a at its corner. This recess 2a includes an inclined surface 2b that extends outward as it approaches the air outlet 4. The projection 3b of the outer deflector 3 is aligned to project towards the inclined surface 2b of the recess 2a of the inner deflector 2. This configuration ensures precise airflow deflection and control, enhancing the Coanda effect by maintaining smooth airflow attachment to the ceiling 6 and minimizing vertical dispersion, thus improving overall air distribution efficiency within the room 7.

[0060] In more specific terms, the aforementioned configuration results in the outflow air undergoing three subsequent deflections along the air outflow path A between the inner deflector 2 and the outer deflector 3: first from a horizontal flow direction to a vertical flow direction, then back to a horizontal flow direction, and finally to a vertical flow direction again. This deflection process ensures the creation of pressure and velocity profiles for the outflow air, which avoids freely dispersing into the room 7 and instead promotes horizontal propagation along the ceiling 6 utilizing the Coanda effect. The outer deflector 3 has a horizontal wall section 3d, with its lower wall surface extending parallel to the upper wall surface of a horizontal wall section 2c of the inner deflector 2. Here, the outflow air is first channeled to be subsequently submitted to the mentioned deflections to create a pressure differential that bends the air and creates a Coanda effect at the air outlet 4. At the same time, the internal components of the air diffuser 1 , such as the mounting electrodes and duct connections, are not visible, and also all deflector elements remain concealed, maintaining the aesthetic integrity of the flushmounted air diffuser 1 with the ceiling 6. An important aspect of the present invention is the method of adjusting the angle of the air outflow path A using the outer deflector 3, changing the airflow geometry without external blades or visible elements. Additionally, the air inlet 9 is compatible with the air outlet 4, ensuring continuous and efficient air circulation.

[0061] The Coanda effect is achieved through pressure differences created by the inner and outer deflectors 2 and 3. A key design challenge was ensuring a 90-degree deflection at the air outlet 4 while concealing fastenings and technical components. Refined proportions and airflow dynamics enhance noise levels and airflow resistance, improving system efficiency. Adjusting the outer deflector 3 alters the high-low pressure difference, changing the airflow direction by 90 degrees.

[0062] The upper outer deflector 3, cooperating with the lower inner deflector 2, creates the Coanda effect. The inner curvatures of the outer deflector 3 and the outer curvatures of the inner deflector 2 must be precisely aligned to create the desired pressure profile. The proportions of the shape and placement of these details are essential to creating the Coanda effect. In the case of deviations, the Coanda effect may be lost, and disproportionately large noise may appear. The outer deflector 3 is a hollow injection-molded plastic part, providing advantages such as lightweight construction, cost-effective production, enhanced durability, and design flexibility. Additionally, it offers thermal insulation, noise reduction, and facilitates the integration of additional airflow control mechanisms.

[0063] The described configuration, with its precise alignment and adjustability, enhances flow control by creating a complex path for the outflow air, allowing better regulation of air pressure and velocity, ultimately resulting in efficient and effective air distribution within the room 7. The air outflow path A and air inflow path B are linked over the fan 11 to establish continuous and efficient air circulation for room climatization.

[0064] Fig. 3 shows the pressure contours (isobars) within the region between the outer deflector 3 and the inner deflector 2 of the air diffuser 1 , as well as at the air outlet 4. The differently shaded lines represent different pressure levels, with the pressure-shading relationship bar on the right-hand side of the figure. The annotations in Fig. 3 highlight the vertical banks denoted by planes D and E, which not only enhance the aesthetic appeal but are also integral to the aerodynamic design. These banks guide the airflow to move horizontally across the ceiling surface, effectively utilizing the Coanda effect to maintain airflow attachment, thus optimizing distribution and improving room comfort. A high-pressure region is indicated by light-shaded contours at the entrance of the air outflow path A. This region initiates the air outflow path A into the diffuser region between the inner and outer deflectors 2 and 3, pushing the air into the system. As the air moves through the air outflow path A, the pressure drops, shown by the transition from light-shaded to dark-shaded colors. This drop in pressure helps accelerate the airflowthrough the air diffuser 1.

[0065] The pressure differences caused by the geometry of the deflectors 2 and 3 create the Coanda effect. A key challenge in the development of this geometry was to create a 90-degree deflection in the air outflow path A at the air outlet 4 while making the fastening and technical parts invisible through the diffuser openings. The proportions and turbulence have been improved through many simulations, optimizing noise reduction and overall airflow resistance.

[0066] The interaction between the inner geometry of the outer deflector 3 and the outer geometry of the inner deflector 2 creates a high-low pressure difference that directs the airflow along the air outflow path A. When the outer deflector 3 is raised upwards, the difference between high and low pressure decreases, allowing the direction of airflow along the air outflow path A to change by 90 degrees.

[0067] The lowest pressure is indicated by dark-shaded contours near the inclined surface 2b of the inwardly stepped recess 2a formed at the corner of the inner deflector 2. This low-pressure area is crucial for maintaining the Coanda effect, ensuring the airflow remains attached to the deflectors 2 and 3 and follows the designed path A, promoting horizontal propagation along the ceiling 6.

[0068] The distinct pressure differences created by the deflectors 2 and 3 ensure that the air follows the designed path A, minimizing turbulence and promoting smooth airflow along the ceiling 6. The low-pressure regions help adhere the airflow to the deflector surfaces, enhancing the Coanda effect at the air outlet 4. This attachment ensures that the air flows along the ceiling 6, providing even distribution and preventing uncomfortable drafts.

[0069] The controlled deflections and pressure variations ensure that the air is distributed uniformly across the room 7, improving overall comfort and air quality. The configuration effectively utilizes pressure differences to create a stable and controlled airflow. The Coanda effect is leveraged to ensure that the airflow adheres to the ceiling 6, promoting even air distribution. The low-pressure areas near the deflectors 2 and 3 are crucial in maintaining the airflow attachment, reducing turbulence, and optimizing the performance of the air diffuser 1.

[0070] Fig. 4 illustrates the airflow velocities within the diffuser 1 and at the air outlet 4 of the diffuser 1 , based on the same detailed section as shown in Figs. 2 and 3. The different airflow velocities along the air outflow path A are depicted in this Fig. 4 with various shadings. The vertical shading scale on the right side of Fig. 4 shows the relationship between the shadings and the respective airflow velocities.

[0071] As in Fig. 3, in Fig. 4 only the outer deflector 3, the inner deflector 2, and the air outlet 4 are provided with reference signs. A strong velocity gradient is generated between the outer deflector 3 and the inner deflector 2. Directly at the recess 2a of the inner deflector 2 along its inclined surface 2b, there is a lower airflow velocity, as indicated by the dark grey to black colors. However, in the middle of the gap between the inner deflector 2 and the outer deflector 3, up to the projection 3b of the outer deflector 3, the airflow velocity is significantly increased, as shown by the light grey to white colors. This velocity gradient causes an outward-directed airflow at the air outlet 4, which adheres to the ceiling 6 of the room 7, promoting the Coanda effect.

[0072] The shading scale on the right indicates that the airflow velocities range from approximately 0.5 m / s to approximately 4 m / s. The velocities increase along the air outflow path A, driven by the strong velocity gradient between the inner and outer deflectors 2 and 3.

[0073] Overall, Fig. 4 clearly demonstrates how the velocity profile along the air outflow path A supports the efficient distribution of air and promotes the Coanda effect by directing the airflow along the ceiling 6, ensuring an even distribution within the room 7. The increased velocity at the middle of the gap between the inner and outer deflectors 2 and 3 indicates a well-designed aerodynamic profile that reduces resistance and enhances the Coanda effect, leading to improved airflow management and indoor comfort.

[0074] Additionally, it can be observed that the velocity decreases as the airflow moves further along the outflow path A, transitioning from light grey to dark grey. This decrease in velocity ensures a smooth transition of airflow, minimizing turbulence and promoting a consistent attachment to the ceiling 6, thereby optimizing the air distribution and enhancing the overall efficiency of the air diffuser 1.

[0075] In conjunction with Fig. 3, Fig. 4 underscores the importance of the deflector geometries and their alignment in creating the necessary pressure and velocity profiles to achieve the Coanda effect. The interplay between pressure and velocity variations is meticulously engineered to ensure that the air diffuser 1 performs effectively, providing both efficient airflow distribution and enhanced room climatization.

[0076] The detailed description provided for the air diffuser 1 underscores the innovative configuration and functionality that address the shortcomings of traditional air diffusers. By leveraging the Coanda effect and incorporating adjustable deflector components, the air diffuser 1 ensures optimal airflow distribution and efficient room climatization while maintaining aesthetic integration with the ceiling 6. The inventive configuration allows for precise control over air pressure, velocity, and flow direction, ensuring consistent and comfortable air distribution throughout the room 7. The pressure and velocity profiles, meticulously engineered and illustrated in the accompanying Figs. 3 and 4, highlight the efficiency of the air diffuser 1 in creating a stable and controlled airflow. This advanced configuration not only enhances indoor comfort and air quality but also reduces energy consumption, making it a versatile and efficient solution for modern HVAC systems in both residential and commercial applications.

[0077] List of reference signs

[0078] 1 air diffuser

[0079] 2 inner deflector

[0080] 2a recess (inner deflector)

[0081] 2b inclined surface (inner deflector)

[0082] 2c horizontal wall section (inner deflector)

[0083] 3 outer deflector

[0084] 3a inner surface (outer deflector)

[0085] 3b projection (outer deflector)

[0086] 3c concave segment (outer deflector)

[0087] 3d horizontal wall section (outer deflector)

[0088] 4 air outlet 5 outer diffuser housing

[0089] 5a inner surface (outer diffuser housing)

[0090] 6 ceiling (room)

[0091] 7 room 8 inner diffuser body

[0092] 8a horizontal wall section (inner diffuser body)

[0093] 9 air inlet

[0094] 10 air conditioning system

[0095] 11 heating / cooling coil 12 fan

[0096] 13 air filter

[0097] A air outflow path

[0098] B air inflow path

[0099] C central axis (air diffuser) D, E vertically extending planes

Claims

Claims1. An air diffuser (1) configured for flush mounting with a ceiling (6) of a room (7), comprising:- an outer diffuser housing (5);- an inner deflector (2) disposed within the outer diffuser housing (5), having a multiangled shape;- an outer deflector (3), movably mounted to the inner surface (5a) of the outer diffuser housing (5), said outer deflector (3) having a multi-concave shape at its inner surface (3a) facing the inner deflector (2);- an air outflow path (A) formed at least partially between the inner deflector (2) and the outer deflector (3), wherein outflow air is subjected to multiple deflections along the air outflow path (A); and- an air outlet (4) through which the outflow air ejects horizontally along the ceiling (6) of the room (7), utilizing the Coanda effect to maintain the airflow attachment to the ceiling (6), wherein a position of the outer deflector (3) relative to the inner deflector (2) is adjustable to control air velocity, pressure, and flow direction along the air outflow path (A) to achieve the Coanda effect.

2. The air diffuser (1) according to claim 1 , wherein the outer deflector (3) has two concave segments (3c) between which a projection (3b) is formed, projecting inwardly towards the inner deflector (2).

3. The air diffuser (1) according to claim 1 or 2, wherein an end section of the inner deflector (2) leading to the air outlet (4) has an approximately L-shaped configuration in a vertical cross-sectional view through the diffuser (1), with the corner of this L-shaped configuration provided with an inwardly stepped recess (2a).

4. The air diffuser (1) according to claim 3, wherein the recess (2a) at the corner of the inner deflector (2) comprises an inclined surface (2b) that extends further outward as it approaches the air outlet (4).

5. The air diffuser (1) according to claims 2 and 4, wherein the projection (3b) of the outer deflector (3) projects towards the inclined surface (2b) of the recess (2a) of the inner deflector (2).

6. The air diffuser (1) according to any one of claims 1 to 5, capable of performing both air supply and exhaust functions through a single integrated unit, wherein the diffuser (1) utilizes an internal geometric configuration that, coupled with the Coanda effect, prevents the mixing of supply and exhaust airflows.

7. The air diffuser (1) according to claim 6, further comprising an inner diffuser body (8) disposed within the inner deflector (2), with an air inflow path (B) formed between opposing wall surfaces of the inner diffuser body (8) and the inner deflector (2), beginning at an air inlet (9) through which inflow air is sucked from the room (7) into the diffuser (1).

8. The air diffuser (1) according to claim 7, wherein the inner diffuser body (8) has an approximately L-shaped configuration in a vertical cross-sectional view through the diffuser (1), and is aligned concentrically with the inner deflector (2) such that the opposing wall surfaces of the inner diffuser body (8) and the inner deflector (2) delimiting the air inflow path (B) extend approximately parallel to each other.

9. The air diffuser (1) according to claim 7 or 8, wherein the inner diffuser body (8) has a horizontal wall section (8a) whose lower surface is configured to extend at the same height as the lower surface of the ceiling (6) to achieve a flush mounting of the diffuser (1) in the ceiling (6).

10. The air diffuser (1) according to any one of claims 1 to 9, wherein three subsequent deflections are imparted on the outflow air along the air outflow path (A) between the inner deflector (2) and the outer deflector (3), including: from a horizontal flow direction to a vertical flow direction; from the vertical flow direction back to a horizontal flow direction; and finally from the horizontal flow direction back to a vertical flow direction.

11. The air diffuser (1) according to any one of claims 1 to 10, wherein the outer deflector (3) has a horizontal wall section (3d) at its end directed away from the air outlet (4), with a lower wall surface of this horizontal wall section (3d) extending parallel to an upper wall surface of a horizontal wall section (2c) of the inner deflector (2).

12. The air diffuser (1) according to any one of claims 1 to 11, wherein vertical and / or horizontal adjustability of the outer deflector (3) is achieved through mechanical means such as screws, slides, or other fastening mechanisms connecting the outer deflector (3) to the outer diffuser housing (5).

13. The air diffuser (1) according to any one of claims 1 to 12, wherein the outer deflector (3) is a hollow injection-molded plastic part.

14. The air diffuser (1) according to any one of claims 1 to 13, wherein the air outlet (4) is formed between a vertically extending plane (D) of the inner deflector (2) and a vertically extending plane (E) of the outer diffuser housing (5).

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