TECHNICAL FIELD
The present disclosure relates generally to heating, ventilation and air-conditioning (HVAC) systems and more specifically, to systems and methods for determining at least one region associated with generation of noise due to flow of air in HVAC arrangements.
BACKGROUND
Generally, a global increase in temperature has necessitated use of heating, ventilation and air-conditioning (HVAC) systems almost everywhere, from residential establishments to workplaces and even automobiles. For example, automobiles employ air-conditioning systems to provide flow of cool air (such as, air having a reduced temperature as compared to a temperature of cabin of the automobile) to increase comfort of one or more passengers travelling within the automobile.
It will be appreciated that not only is temperature regulation important for increasing comfort of the one or more passengers travelling within the automobile, but also other factors, such as, reduction of noise generated by operation of the air-conditioning systems. However, as such air-conditioning systems comprise various moving components therein, it becomes extremely difficult and cumbersome to determine a region associated with generation of noise within the air-conditioning systems. Consequently, various prior art solutions have been contemplated for such a purpose.
In one prior art solution, provided is an automatic generation of an accurate network of watertight NURBS patches from polygonal models of objects while automatically detecting and preserving character lines thereon. These embodiments generate from an initial triangulation of the surface, a hierarchy of progressively coarser triangulations of the surface by performing a sequence of edge contractions using a greedy algorithm that selects edge contractions by their numerical properties. Operations are also performed to connect the triangulations in the hierarchy using homeomorphisms that preserve the topology of the initial triangulation in the coarsest triangulation. A desired quadrangulation of the surface can then be generated by homeomorphically mapping edges of a coarsest triangulation in the hierarchy back to the initial triangulation. This quadrangulation is topologically consistent with the initial triangulation and is defined by a plurality of quadrangular patches. These quadrangular patches are linked together by a (U, V) mesh that is guaranteed to be continuous at patch boundaries. A grid is then preferably fit to each of the quadrangles in the resulting quadrangulation by decomposing each of the quadrangles into k smaller quadrangles. A watertight NURBS model may be generated from the resulting quadrangulation.
In another prior art solution, provided are systems and methods for modifying and generating quadrilateral meshes for computer graphic structures include obtaining a polygon mesh representing a computer graphic structure, the polygon mesh comprising a plurality of polygonal faces and a plurality of singularities, determining, based on a first singularity of the plurality of vertices, selecting, based on one or more characteristics of the patch, a first minimum singularity template (MST) of a plurality of MSTs each

representing a corresponding quadmesh that has three or fewer singularities, and replacing, within the polygon mesh, the patch with the first MST.
In yet another prior art solution, provided is a system and method for quadrangulating a triangle mesh is taught herein. After constructing an as smooth as possible symmetric cross field satisfying a sparse set of directional constraints (t) capture the geometric structure of the surface), the mesh is cut open in order to enable a low distortion unfolding. Then, a seamless globally smooth parametrization is computed whose iso-parameter lines follow the cross-field directions. Notably, sparsely distributed directional constraints are sufficient to automatically determine the appropriate number, type and position of singularities in the quadrangulation. Both steps of the algorithm (cross field and parametrization) can be formulated as a mixed-integer problem which is solved very efficiently by an adaptive greedy solver, in order to generate high quality quad meshes in a fully automatic manner.
In yet another prior art solution, provided is a method for generating an anisotropic quadrilateral grid based on wave equations, comprising the following steps of: generating a corresponding feature constraint, an orientation field and an anisotropic density field according to the requirements of users and model characteristics; constructing a two-dimensional standing wave on the grid surface according to the feature constraint, the orientation field and the anisotropic density field; forming quadrangle dissections from the two-dimensional standing wave; and constructing anisotropic global parameterization on the basis of the quadrangle dissections, and then obtaining the final quadrangle grids. With the method, the anisotropic quadrangle grids can be generated, and simultaneously the requirements for the shape, density, orientation, feature alignment, singular point distribution and the like of the quadrangle grids can be flexibly controlled and optimized.
However, none of the aforementioned prior art solutions enable precise determination of regions associated with generation of noise in HVAC arrangements.
Therefore, in light of the foregoing discussion, there exists a need to overcome various problems associated with conventional systems and methods for determining regions associated with generation of noise in HVAC arrangements.
SUMMARY
This section provides a general summary of the disclosure and is not a comprehensive disclosure of its full scope or all of its features.
The present disclosure seeks to provide an improved system for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement. Furthermore, the present disclosure seeks to provide an improved method for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement.

According to an aspect, an embodiment of the present disclosure provides a system for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement, the system comprising:
a data storing arrangement configured to store an electronic document corresponding to a design of the HVAC arrangement; and
a data processing arrangement configured to:
receive the electronic document from the data storing arrangement;
remove at least one surface irregularity from the design of the HVAC arrangement to obtain
an airtight compartment associated with the HVAC arrangement;
divide the airtight compartment into a plurality of volumes;
generate a plurality of quadrangular elements corresponding to each volume of the plurality of
volumes;
arrange a plurality of predictive brick cells within the plurality of volumes;
generate a plurality of fringed layers on each quadrangular element of the plurality of
quadrangular elements; and
calculate a mass equation, a momentum equation and a turbulence equation associated with
the flow of air within the HVAC arrangement in a steady-state condition, to determine at least
one flow recirculation region within the HVAC arrangement, wherein the at least one flow
recirculation region corresponds to the at least one region associated with generation of noise
within the HVAC arrangement.
Optionally, the at least one surface irregularity comprises: an unwanted surface, a surface intersection, an overlapping surface, a corner, a fillet, a manifold, a hole.
Optionally, the data processing arrangement is further configured to determine a thread skewness for each quadrangular element of the plurality of quadrangular elements, wherein the thread skewness is determined as a double of a ratio of in-circle diameter of the quadrangular element to the circum-circle diameter of the quadrangular element.
Optionally, the data processing arrangement is further configured to determine a cell skewness for each quadrangular element of the plurality of quadrangular elements, wherein the cell skewness comprises at least one of: a negative volume, a twisted cell, a skewed cell.
Optionally, the data processing arrangement is configured to generate the plurality of predictive brick cells in volumes receiving maximum flow of air within the HVAC arrangement.
Optionally, the data processing arrangement is further configured to determine an instantaneous flow of air within the HVAC arrangement in the steady-state condition.

Optionally, the data processing arrangement is further configured to determine, based on the determination of the instantaneous flow of air, at least one of: turbulent shear stress, flow instability, secondary flow, flow peeling.
Optionally, the data processing arrangement is further configured to generate a graph depicting the noise generated by the at least one region.
According to another aspect, an embodiment of the present disclosure provides a method for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement, the method comprising:
- receiving the electronic document corresponding to a design of the HVAC arrangement;
- removing at least one surface irregularity from the design of the HVAC arrangement to obtain an airtight compartment associated with the HVAC arrangement;
- dividing the airtight compartment into a plurality of volumes;
- generating a plurality of quadrangular elements corresponding to each volume of the plurality of
volumes;
- arranging a plurality of predictive brick cells within the plurality of volumes;
- generating a plurality of fringed layers on each quadrangular element of the plurality of quadrangular elements; and
- calculating a mass equation, a momentum equation and a turbulence equation associated with the flow of air within the HVAC arrangement in a steady-state condition to determine at least one flow recirculation region within the HVAC arrangement, wherein the at least one flow recirculation region corresponds to the at least one region associated with generation of noise within the HVAC arrangement.
Optionally, the method further comprises determining a thread skewness for each quadrangular element of the plurality of quadrangular elements, wherein the thread skewness is determined as a double of a ratio of in-circle diameter of the quadrangular element to the circum-circle diameter of the quadrangular element.
Further areas of applicability will become apparent from the description provided herein. 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. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
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 a block diagram of a system for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement, in accordance with an embodiment of the present disclosure;
FIGs. 2A-D depict a plurality of steps of removal of surface irregularities from an exemplary design of an HVAC arrangement, in accordance with an embodiment of the present disclosure;
FIGs. 3A-D depict a plurality of steps of removal of surface irregularities from an exemplary design of an HVAC arrangement, in accordance with another embodiment of the present disclosure;
FIG. 4 illustrates a determination of thread skewness for quadrangular elements generated for an exemplary HVAC arrangement, in accordance with an embodiment of the present disclosure;
FIG. 5 illustrates generation of a plurality of predictive brick cells into an airtight compartment associated with an exemplary HVAC arrangement, in accordance with an embodiment of the present disclosure;
FIG. 6 illustrates insertion of a plurality of predictive brick cells into an airtight compartment associated with an exemplary HVAC arrangement, in accordance with an embodiment of the present disclosure;
FIG. 7 illustrates generation of fringed layers on quadrangular elements associated with an exemplary HVAC arrangement, in accordance with an embodiment of the present disclosure;
FIGs. 8A-B show graphs depicting noise generated by regions of an exemplary HVAC arrangement, in accordance with an embodiment of the present disclosure; and
FIG. 9 is a flow-chart illustrating steps of a method for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement, 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
Exemplary embodiments will now be described more fully with reference to the accompanying drawings.
The exemplary embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to persons skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be appreciated by persons skilled in the art that specific details need not be employed. Exemplary embodiments may be embodied in many different forms. Thus, neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. As used herein, singular forms such as "a," "an," and "the" may be intended to include corresponding plural forms as well, unless the context clearly indicates otherwise. Furthermore, terms akin to "comprises," "comprising," "including," and "having," are inclusive and therefore, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
When an element or layer is referred to as being "on," "engaged to," "connected to," or "coupled to" another element or layer, it may be disposed directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present therein. However, when an element is referred to as being "directly on," "directly engaged to," "directly connected to," or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe a relationship between elements should be interpreted in a like manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Spatially relative terms such as "inner," "outer," "beneath," "below," "lower," "above," "upper," and the like may be used herein for ease of description, to describe an element's or a feature's relationship to another element(s) or feature(s) as illustrated in the figures. Furthermore, spatially relative terms may be intended to encompass different orientations of the device in use or in operation, in addition to one or more orientations depicted in the figures. For example, if the device in the figures is turned over, elements

described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. It will be appreciated that the device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein should be interpreted accordingly.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
The term "user" relates to at least one individual that uses or operates the system or arrangement or device (or other variants thereof) as claimed, such as, by interacting with at least one component of the system or arrangement or device (or other variants thereof).
Moreover, if any method steps, processes, and operations are described, they are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
In overview, embodiments of the present disclosure are concerned with systems and methods for determining at least one region associated with generation of noise due to flow of air in HVAC arrangements.
According to an aspect, an embodiment of the present disclosure provides a system for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement, the system comprising:
a data storing arrangement configured to store an electronic document corresponding to a design of the HVAC arrangement; and
a data processing arrangement configured to:
receive the electronic document from the data storing arrangement;
remove at least one surface irregularity from the design of the HVAC arrangement to obtain
an airtight compartment associated with the HVAC arrangement;
divide the airtight compartment into a plurality of volumes;
generate a plurality of quadrangular elements corresponding to each volume of the plurality of
volumes;

arrange a plurality of predictive brick cells within the plurality of volumes;
generate a plurality of fringed layers on each quadrangular element of the plurality of
quadrangular elements; and
calculate a mass equation, a momentum equation and a turbulence equation associated with
the flow of air within the HVAC arrangement in a steady-state condition, to determine at least
one flow recirculation region within the HVAC arrangement, wherein the at least one flow
recirculation region corresponds to the at least one region associated with generation of noise
within the HVAC arrangement.
According to another aspect, an embodiment of the present disclosure provides a method for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement, the method comprising:
- receiving the electronic document corresponding to a design of the HVAC arrangement;
- removing at least one surface irregularity from the design of the HVAC arrangement to obtain an airtight compartment associated with the HVAC arrangement;
- dividing the airtight compartment into a plurality of volumes;
- generating a plurality of quadrangular elements corresponding to each volume of the plurality of
volumes;
- arranging a plurality of predictive brick cells within the plurality of volumes;
- generating a plurality of fringed layers on each quadrangular element of the plurality of quadrangular elements; and
- calculating a mass equation, a momentum equation and a turbulence equation associated with the flow of air within the HVAC arrangement in a steady-state condition to determine at least one flow recirculation region within the HVAC arrangement, wherein the at least one flow recirculation region corresponds to the at least one region associated with generation of noise within the HVAC arrangement.
Referring to FIG. 1, there is shown a block diagram of a system 100 for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement, in accordance with an embodiment of the present disclosure. The HVAC arrangement can be implemented as an automobile air-conditioning arrangement that is configured to regulate temperature within a cabin of the automobile. Furthermore, such an air-conditioning arrangement can be configured to provide flow of a refrigerant (such as a gaseous refrigerant, including but not limited to air, R290, R600a and so forth) therethrough for allowing transfer of heat from one part of the air conditioning arrangement to another. It will be appreciated that such a flow of the refrigerant leads to generation of noise within the HVAC arrangement. Consequently, the system 100 enables to determine such areas within the HVAC arrangement associated

with generation of noise due to flow of air and consequently, to reduce such generated noise. Optionally, such areas are further analyzed and once countermeasures are taken, the countermeasures can be validated by the system 100 to ensure that the noise generated has been reduced (such as, by comparison of noise generated before and after the countermeasures are taken).
The system 100 comprises a data storing arrangement 102 configured to store an electronic document corresponding to a design of the HVAC arrangement. The data storing arrangement 102 can be implemented as a a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a digital versatile disk (DVD), a static random access memory (SRAM), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or raised structures in a groove having instructions recorded thereon, a media such as those supporting the internet or an intranet, or a magnetic storage device and so forth. Alternatively, the data storing arrangement 102 can be implemented as a web-based server arrangement (such as, a cloud server arrangement) implemented using a NoSQL database management system such as MongoDB. The data storing arrangement 102 is configured to store the electronic document corresponding to the design of the HVAC arrangement, such an electronic document can correspond to a file generated after designing the HVAC system using a computer-aided design (CAD) software such as AutoCAD®, SolidWorks®, CATIA™ and so forth. Alternatively, the electronic document can comprise a 3D point cloud map that is generated using a 3D scanning apparatus (such as, a LiDAR-based apparatus).
Furthermore, the system 100 comprises a data processing arrangement 104 configured to receive the electronic document from the data storing arrangement 102. The data processing arrangement 104 can be implemented using any arrangement of electric and electronic components capable of performing operations (for example, computing operations, graphics processing operations and so forth), such as a dedicated processor, a portion of a processor, a virtual processor, a portion of a virtual processor, portion of a virtual device, or a virtual device. For example, the data processing arrangement 104 can be implemented as a physical processor or a virtual processor. In another example, a virtual processor may correspond to one or more parts of one or more physical processors. In yet another example, instructions/logic may be distributed and executed across one or more processors, virtual or physical, to execute the instructions/logic. Moreover, the data processing arrangement 104 may execute an operating system, for example, but not limited to, Microsoft® Windows®; Mac® OS X®; Red Hat® Linux®, or any other proprietary operating system without departing from a scope of the present disclosure. In an embodiment, the data processing arrangement 104 can be implemented as a microcontroller, a microprocessor, Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) and so forth.
The data processing arrangement 104 is configured to remove at least one surface irregularity from the design of the HVAC arrangement to obtain an airtight compartment associated with the HVAC arrangement. The data processing arrangement 104 is configured to analyze the design of the HVAC

arrangement and subsequently, remove any surface irregularities associated therewith. Such removal of the surface irregularities enables to make the design of the HVAC arrangement to be airtight in nature. In an embodiment, the at least one surface irregularity comprises an unwanted surface, a surface intersection, an overlapping surface, a corner, a fillet, a manifold and a hole. For example, such unwanted surface can comprise corners having an angle less than or equal to 30°, fillets, manifold surfaces, small holes (such as, holes having a diameter less than or equal to a predetermined value) and so forth. Such unwanted surfaces are eliminated from the HVAC arrangement.
Referring to FIGs. 2A-D, there is shown an exemplary design of an HVAC arrangement with surface irregularities removed therefrom, in accordance with an embodiment of the present disclosure. FIG. 2A illustrates a first step 200 of the removal of surface irregularities from the design of the HVAC arrangement, FIG. 2B illustrates a second step 202 of the removal of surface irregularities from the design of the HVAC arrangement, FIG. 2C illustrates a third step 204 of the removal of surface irregularities from the design of the HVAC arrangement and FIG. 2D illustrates a last step 206 of the removal of surface irregularities from the design of the HVAC arrangement resulting in the HVAC arrangement without surface irregularities.
Referring to FIGs. 3A-D, there is shown an exemplary design of an HVAC arrangement with surface irregularities removed therefrom, in accordance with another embodiment of the present disclosure. FIG. 3A illustrates a first step 300 of the removal of surface irregularities from the design of the HVAC arrangement, FIG. 3B illustrates a second step 302 of the removal of surface irregularities from the design of the HVAC arrangement, FIG. 3C illustrates a third step 304 of the removal of surface irregularities from the design of the HVAC arrangement and FIG. 3D illustrates a last step 306 of the removal of surface irregularities from the design of the HVAC arrangement resulting in the HVAC arrangement without surface irregularities.
Furthermore, the data processing arrangement 104 is configured to divide the airtight compartment into a plurality of volumes. The data processing arrangement 104 is configured to divide the design of the HVAC arrangement into a number of zones such as, a heat exchanger, a fan, a filter and so forth. It will be appreciated that after the removal of the surface irregularities from the design of the HVAC arrangement (as described herein above), the airtight HVAC compartment will be free from any holes, free surfaces, interfaces of surfaces, intersections of surfaces and the like. Subsequently, the data processing arrangement 104 is configured to generate a plurality of quadrangular elements corresponding to each volume of the plurality of volumes. The data processing arrangement 104 is configured to quadrangulate the design of the HVAC arrangement free of surface irregularities into a finite number of smaller surface elements. Such quadrangulation of the surface of the HVAC arrangement into smaller elements is performed in such a way that each quandragulated element results in high quality predictive cell generation. Moreover, each boundary edge of the surface of the HVAC arrangement is preserved to better capture the geometry associated with the quadrangulated elements. Moreover, quandrangulation is refined near such boundary edge till the quandrangulated elements capture a shape of the surface of the HVAC arrangement. It will be

appreciated that the quandrangulation will be free from any surface irregularities holes, overlapped faces, intersecting elements and the like.
Moreover, the data processing arrangement 104 is configured to arrange a plurality of predictive brick cells within the plurality of volumes and generate a plurality of fringed layers on each quadrangular element of the plurality of quadrangular elements. Optionally, the data processing arrangement 104 is configured to perform a quality check of the quadrangulated elements. In an embodiment, the data processing arrangement 104 is further configured to determine a thread skewness for each quadrangular element of the plurality of quadrangular elements. Such a determination of the thread skewness of each quadrangular element enables to determine the quality of the quadrangular element. The thread skewness is determined as a double of a ratio of in-circle diameter of the quadrangular element to the circum-circle diameter of the quadrangular element.
Referring to FIG. 4, there is illustrated a determination of thread skewness 400 for quadrangular elements generated for an exemplary HVAC arrangement, in accordance with an embodiment of the present disclosure.
Subsequently, predictive brick cells are inserted into the airtight compartment associated with the HVAC arrangement. In an embodiment, the data processing arrangement 104 is configured to generate the plurality of predictive brick cells in volumes receiving maximum flow of air within the HVAC arrangement. The predictive brick cells are generated by the data processing arrangement 104 in a main region of flow of air within the HVAC arrangement. This enables to determine a behavior associated with flow of air at free stream region (as such a behavior of flow is fully turbulent). Furthermore, fringed layers are created on surfaces associated with the HVAC arrangement such as, to resolve a turbulence boundary layer associated therewith. Moreover, thickness of the fringed layer is in an order of a boundary layer height with a minimum layer thickness having a y+ value less than 3. It will be appreciated that determination of a solution to generation of noise depends substantially on generation of the predictive brick cells and fringed layers.
Referring to FIG. 5, there is illustrated generation of a plurality of predictive brick cells 500 into an airtight compartment associated with an exemplary HVAC arrangement, in accordance with an embodiment of the present disclosure.
Referring to FIG. 6, there is illustrated insertion of a plurality of predictive brick cells 600 into an airtight compartment associated with an exemplary HVAC arrangement, in accordance with an embodiment of the present disclosure.

Referring to FIG. 7, there is illustrated generation of fringed layers on quadrangular elements associated with an exemplary HVAC arrangement, in accordance with an embodiment of the present disclosure.
In an embodiment, the data processing arrangement 104 is further configured to determine a cell skewness for each quadrangular element of the plurality of quadrangular elements. Such a determination of the cell skewness by the data processing arrangement 104 enables to check for any errors associated with each quadrangular element. The cell skewness comprises at least one of a negative volume, a twisted cell, a skewed cell. Moreover, the data processing arrangement 104 is configured to calculate a mass equation, a momentum equation and a turbulence equation associated with the flow of air within the HVAC arrangement in a steady-state condition, to determine at least one flow recirculation region within the HVAC arrangement. The data processing arrangement 104 is configured to perform steady state computation by solving the mass equation, momentum equation and turbulence equation to determine the flow behavior of air in steady state condition. It will be appreciated that such flow behavior will be invariant with time. However, the flow behavior shows flow recirculation areas that enables to determine problematic regions associated with generation of noise within the HVAC arrangement. The at least one flow recirculation region corresponds to the at least one region associated with generation of noise within the HVAC arrangement.
In an embodiment, an exemplary user interface allowing selection of steady state computation (such as, to allow the data processing arrangement 104 to perform the steady state computation) is rendered to the user.
In an embodiment, the data processing arrangement 104 is further configured to determine continuity convergence. The continuity convergence is determined by checking if a conservation law associated with the flow of air is satisfied or not. It will be appreciated that mass conservation and momentum conservation should be satisfied to ensure that flow behavior of air does not change thereafter.
In an embodiment, the data processing arrangement 104 is further configured to determine an instantaneous flow of air within the HVAC arrangement in the steady-state condition. It will be appreciated that as the flow behavior of air within the HVAC arrangement is transient in nature means (such that the flow changes with time), determination of precise flow behavior is important. Consequently, the flow behavior is determined by performing transient computation for flow. Furthermore, once the steady state computation is completed, transient computation is performed to determine the instantaneous flow behavior of air within the HVAC arrangement. In an embodiment, the the data processing arrangement 104 is further configured to determine, based on the determination of the instantaneous flow of air, at least one of turbulent shear stress, flow instability, secondary flow, flow peeling. Such phenomenon including turbulent shear stress, flow instability, secondary flows, flow peeling, and so forth associated flow of air is observed during the transient computation. It will be appreciated that as an actual behavior associated with the flow of air is observed during the transient computation, a user of the system

can take necessary countermeasures to reduce, such as minimize, noise generated within the HVAC arrangement.
In an embodiment, an exemplary user interface allowing selection of transient computation (such as, to allow the data processing arrangement 104 to perform the transient computation is rendered to the user.
In an embodiment, the data processing arrangement 104 is further configured to generate a graph depicting the noise generated by the at least one region. Such a graph visually represents noise generated within various regions of the HVAC arrangement, thereby, enabling a user to analyse and take take necessary countermeasures to reduce, such as minimize, noise generated within the HVAC arrangement.
Referring to FIGs. 8A-B, there are shown graphs 800-802 depicting noise generated by regions of an exemplary HVAC arrangement, in accordance with an embodiment of the present disclosure.
Referring to FIG. 9, there is shown a flow-chart illustrating steps of a method 900 for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement, in accordance with an embodiment of the present disclosure. At a step 902, the electronic document corresponding to a design of the HVAC arrangement is received. At a step 904, at least one surface irregularity is removed from the design of the HVAC arrangement to obtain an airtight compartment associated with the HVAC arrangement. At a step 906, the airtight compartment is divided into a plurality of volumes. At a step 908, a plurality of quadrangular elements is generated corresponding to each volume of the plurality of volumes. At a step 910, a plurality of predictive brick cells is arranged within the plurality of volumes. At a step 912, a plurality of fringed layers is generated on each quadrangular element of the plurality of quadrangular elements. At a step 914, a mass equation, a momentum equation and a turbulence equation associated with the flow of air within the HVAC arrangement in a steady-state condition are calculated to determine at least one flow recirculation region within the HVAC arrangement. The at least one flow recirculation region corresponds to the at least one region associated with generation of noise within the HVAC arrangement.
Optionally, the method 900 further comprises a step of determining a thread skewness for each quadrangular element of the plurality of quadrangular elements, wherein the thread skewness is determined as a double of a ratio of in-circle diameter of the quadrangular element to the circum-circle diameter of the quadrangular element.
The foregoing description of the embodiments has been provided for purposes of illustration and description. 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. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are

interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

We claim

1.A system for determining at least one region associated with generation of noise due to flow of air in a
HVAC arrangement, the system comprising:
a data storing arrangement configured to store an electronic document corresponding to a design of the HVAC arrangement; and
a data processing arrangement configured to:
receive the electronic document from the data storing arrangement;
remove at least one surface irregularity from the design of the HVAC arrangement to obtain
an airtight compartment associated with the HVAC arrangement;
divide the airtight compartment into a plurality of volumes;
generate a plurality of quadrangular elements corresponding to each volume of the plurality of
volumes;
arrange a plurality of predictive brick cells within the plurality of volumes;
generate a plurality of fringed layers on each quadrangular element of the plurality of
quadrangular elements; and
calculate a mass equation, a momentum equation and a turbulence equation associated with
the flow of air within the HVAC arrangement in a steady-state condition, to determine at least
one flow recirculation region within the HVAC arrangement, wherein the at least one flow
recirculation region corresponds to the at least one region associated with generation of noise
within the HVAC arrangement.
2. A system as claimed in claim 1, wherein the at least one surface irregularity comprises: an unwanted surface, a surface intersection, an overlapping surface, a corner, a fillet, a manifold, a hole.
3. A system as claimed in claim 1, wherein the data processing arrangement is further configured to determine a thread skewness for each quadrangular element of the plurality of quadrangular elements, wherein the thread skewness is determined as a double of a ratio of in-circle diameter of the quadrangular element to the circum-circle diameter of the quadrangular element.
4. A system as claimed in claim 1, wherein the data processing arrangement is further configured to determine a cell skewness for each quadrangular element of the plurality of quadrangular elements, wherein the cell skewness comprises at least one of: a negative volume, a twisted cell, a skewed cell.
5. A system as claimed in claim 1, wherein the data processing arrangement is configured to generate the plurality of predictive brick cells in volumes receiving maximum flow of air within the HVAC arrangement.

6. A system as claimed in claim 1, wherein the data processing arrangement is further configured to determine an instantaneous flow of air within the HVAC arrangement in the steady-state condition.
7. A system as claimed in claim 6, wherein the data processing arrangement is further configured to determine, based on the determination of the instantaneous flow of air, at least one of: turbulent shear stress, flow instability, secondary flow, flow peeling.
8. A system as claimed in claim 1, wherein the data processing arrangement is further configured to generate a graph depicting the noise generated by the at least one region.
9. A method for determining at least one region associated with generation of noise due to flow of air in a HVAC arrangement, the method comprising:

- receiving the electronic document corresponding to a design of the HVAC arrangement;
- removing at least one surface irregularity from the design of the HVAC arrangement to obtain an airtight compartment associated with the HVAC arrangement;
- dividing the airtight compartment into a plurality of volumes;
- generating a plurality of quadrangular elements corresponding to each volume of the plurality of
volumes;
- arranging a plurality of predictive brick cells within the plurality of volumes;
- generating a plurality of fringed layers on each quadrangular element of the plurality of quadrangular elements; and
- calculating a mass equation, a momentum equation and a turbulence equation associated with the flow of air within the HVAC arrangement in a steady-state condition to determine at least one flow recirculation region within the HVAC arrangement, wherein the at least one flow recirculation region corresponds to the at least one region associated with generation of noise within the HVAC arrangement
10. A method as claimed in claim 9, further comprising determining a thread skewness for each
quadrangular element of the plurality of quadrangular elements, wherein the thread skewness is determined
as a double of a ratio of in-circle diameter of the quadrangular element to the circum-circle diameter of the
quadrangular element.