Vertically deployed fan coil unit

Abstract

The invention relates to a fan coil unit (100) having a housing compartment of parallelepiped volume which is closed by a lower wall (33), an upper wall (30), a front wall (23), a rear wall (20) and two side walls (21, 21 '), each side wall (21, 21') being opposite one another with respect to a vertical central axis (y), at least one side opening (22, 22 ') being present on each side wall (21, 21'), the front wall (23) and the rear wall (20) are opposed to each other with respect to a horizontal axis (x) perpendicular to the vertical central axis (y). The fan coil unit (100) comprises at least one heat exchange unit (1, 2) arranged in the housing compartment. In particular, said at least one heat exchange unit (1, 2) comprises ventilation means (27) comprising at least one tangential impeller (24), the axis of which is parallel to said vertical central axis (y), said ventilation means (27) being arranged between the two side walls (21; 21 ') and is configured to extend from the respective at least one side opening (22; 22 ') and generates a first direction (f) along a first rectilinear direction (f) towards the second side wall (21'; 22 '; 22' ') on the side opening (21); furthermore, the heat exchange unit (1, 2) comprises at least one fin group heat exchanger (25) arranged between the ventilation means (27) and the second side wall (21 '; 21) for heating or cooling said air flow, said at least one heat exchanger (25) comprising a plurality of fins (25 ') arranged parallel to said vertical central axis (y) so as to face the air inlet face (26) of said ventilation means (27) and to face said second side wall (21'; 21) and a plurality of flow ducts for the gas flow are formed between the outlet faces (29) of the flow channels. The fan coil unit (100) is characterized in that the ratio between the width (W) of the air inlet face (26) of the at least one heat exchanger (25) and the width (L) of each of the side walls (21, 21 ') of the fan coil unit (100) is between 1: 2 and 1: 3, preferably 1: 2.6, and wherein the width (W) of the air inlet face (26) of the at least one heat exchanger (25) and the width (L) of each of the side walls (21, 21') of the fan coil unit (100) is between 1: 2 and 1: 3, preferably 1: 2.6. The ventilation means (27) of the at least one heat exchange unit (1, 2) are configured such that, during use, an angle of incidence (E) with respect to the air inlet face (26) of the at least one heat exchanger (25) along the first direction (f) of the airflow from the at least one tangential impeller (24) is between 60 DEG and 90 DEG, preferably between 80 DEG and 90 DEG, and the angle of incidence (E) with respect to the air inlet face (26) of the at least one heat exchanger (25) along the second direction (f) of the airflow from the at least one tangential impeller (24) is between 60 DEG and 90 DEG. And more preferably between 85 degrees and 90 degrees.

Description

Technical Field

[0001] This invention relates to a vertically unfolding fan coil unit.

[0002] More precisely, the present invention relates to a vertically deployable fan coil unit designed for home use and designed to be wall-mounted. Background Technology

[0003] In the prior art, wall-mounted residential fan coil units are mainly used for under-window configurations. This configuration is characterized by the fan coil unit structure extending horizontally in width, based on power level.

[0004] In this type of configuration, the heat exchange unit (the element suitable for heat exchange) is designed to be vertically deployed to minimize the overall depth. To maximize heat exchange within the same overall product size, the heat exchange surface of the heat exchange unit is appropriately inclined relative to verticality; however, this comes at the cost of a greater thickness for the same effective thickness of the heat exchange unit. The ventilation elements of the heat exchange unit (such as tangential impellers with their axes arranged in the horizontal width direction) are positioned either below (pushing flow) or above (suction flow) the heat exchange surface. When positioned below the exchange surface, the ventilation elements draw air from the external environment and push it upwards through the heat exchange unit. While this type of configuration allows the utilization of thermal convection, it also introduces performance issues. In fact, due to the impeller's positioning, considering the thermal stratification of air within the fan coil unit and the pressure of the air column acting on the impeller, the impeller performs less efficiently than it could potentially be. To achieve better performance and counteract the effects of the air column and stratification above the element, it is necessary to increase its size, thus increasing the energy consumption required for its operation and the overall size of the fan coil unit itself.

[0005] Furthermore, for everyday applications, this type of solution will be more cumbersome, making it a key ergonomic consideration for potential buyers, and it will also demonstrate potential for improved thermal efficiency.

[0006] Patent document JP H02 71027 A describes a construction model of a fan coil unit having a matching heat exchanger with a "V" shaped cross-section placed between two tangential impellers with a vertical axis. The heat exchanger has the same configuration as a conventional fan coil unit, wherein the air inlet surface of the heat exchanger to be heated / cooled is inclined at an angle of about 20°-30° relative to the rear wall of the fan coil unit, and is arranged in such a way as to cause zigzag airflow, resulting in a loss of energy efficiency because not all parts of the heat exchanger can be uniformly reached by the same airflow. Summary of the Invention

[0007] The purpose of this invention is to overcome the problems of the prior art, and in particular to obtain a vertical fan coil unit for residential applications that has the best thermal performance in terms of cooling and heating compared to conventional fan coil units (of the same size).

[0008] A further objective of this invention is to reduce the thickness of the fan coil unit.

[0009] Another objective of this invention is to improve the efficiency of the heat exchanger so that the airflow to be heated reaches the exchanger evenly.

[0010] One object of the present invention is to provide a fan coil unit having a housing compartment with a parallelepiped volume, the housing compartment being enclosed by a lower wall, an upper wall, a front wall, a rear wall, and two side walls, each side wall being opposite to each other relative to a vertical central axis, wherein each side wall has at least one side opening, the front wall and the rear wall being opposite to each other relative to a horizontal axis perpendicular to the vertical central axis, the fan coil unit including at least one heat exchanger disposed in the housing compartment, the at least one heat exchanger comprising: a ventilation device including at least one tangential impeller, the axis of the at least one tangential impeller being parallel to the vertical central axis, the ventilation device being disposed downstream of a first side wall of the two side walls and configured to draw in air from the corresponding at least one side opening and generate an airflow along a first direction toward a side opening on a second side wall; and at least one finned heat exchanger disposed in the housing compartment. Between the air device and the second sidewall, for heating or cooling the airflow, the at least one heat exchanger includes a plurality of fins arranged parallel to the vertical central axis, thereby forming a plurality of flow channels for the airflow between an inlet surface facing the air device and an outlet surface facing the second sidewall. The fan coil unit is characterized in that the ratio between the width of the inlet surface of the at least one heat exchanger and the width of each of the sidewalls of the fan coil unit is between 1:2 and 1:3, preferably about 1:2.6, and is characterized in that the air device of the at least one heat exchange unit is configured such that during use, the incident angle of the first direction of the airflow from the at least one tangential impeller relative to the inlet surface of the at least one heat exchanger is between 60° and 90°, preferably between 80° and 90°, more preferably between 85° and 90°.

[0011] Another object of the present invention is to provide a fan coil unit having a housing compartment with a parallelepiped volume, the housing compartment being enclosed by a lower wall, an upper wall, a front wall, a rear wall, and two side walls, each side wall being opposite to each other relative to a vertical central axis, wherein each side wall has at least one side opening.

[0012] The front wall and the rear wall are opposite each other with respect to a horizontal axis perpendicular to the vertical central axis.

[0013] The two sidewalls are opposite each other with respect to the transverse axis, which is perpendicular to both the central vertical axis and the horizontal axis.

[0014] The fan coil unit includes at least one heat exchange unit arranged in the housing compartment.

[0015] The at least one heat exchange unit includes

[0016] A ventilation device includes at least one tangential impeller, the axis of which is parallel to the vertical central axis. The ventilation device is arranged downstream of a first sidewall of two sidewalls and configured to draw in air from a corresponding at least one side opening during use and generate an airflow at an outlet along a first linear direction toward a side opening on a second sidewall, the first linear direction lying in a plane parallel to the horizontal plane.

[0017] At least one finned heat exchanger, arranged between the ventilation device and the second sidewall, is used to heat or cool the airflow.

[0018] The fan coil unit is characterized in that the at least one heat exchanger includes a plurality of fins parallel to each other relative to the vertical central axis, each fin having a planar surface with two side edges, a top edge, and a bottom edge, wherein the side edges are parallel to the central vertical axis, and the top and bottom edges are oriented along a first axis arranged in a plane parallel to the horizontal plane, thereby forming a plurality of flow channels for the airflow between an inlet surface formed by the first side edges of the plurality of fins and facing the ventilation device, and an outlet surface formed by the second side edges of the plurality of fins and facing the second sidewall.

[0019] The characteristic is that the ratio between the width of the air inlet surface of the at least one heat exchanger (measured along a second axis perpendicular to the first axis in a plane parallel to the horizontal plane) and the width of each of the sidewalls of the fan coil unit (measured along the transverse axis) is between 1:2 and 1:3, preferably about 1:2.6, and

[0020] The feature is that the at least one finned heat exchanger of the at least one heat exchange unit and the ventilation device are arranged in the housing compartment such that, during use, when the fan coil unit is arranged with its vertical central axis parallel to the direction of gravity, the angle of incidence between the first straight direction of the airflow departing from the at least one tangential impeller, measured on the horizontal plane, and the second axis located on the air inlet surface of the at least one heat exchanger, is between 60° and 90°, preferably between 80° and 90°, more preferably between 85° and 90°, and particularly 90°.

[0021] Another object of the present invention is to provide a fan coil unit having a housing compartment with a parallelepiped volume, the housing compartment being enclosed by a lower wall, an upper wall, a front wall, a rear wall, and two side walls, each side wall being opposite to each other relative to a vertical central axis, wherein each side wall has at least one side opening.

[0022] The front wall and the rear wall are opposite each other with respect to a horizontal axis perpendicular to the vertical central axis.

[0023] The two sidewalls are opposite each other with respect to the transverse axis, which is perpendicular to both the central vertical axis and the horizontal axis.

[0024] The fan coil unit includes at least one heat exchange unit arranged in the housing compartment.

[0025] The at least one heat exchange unit includes

[0026] A ventilation device includes at least one tangential impeller, the axis of which is parallel to the vertical central axis. The ventilation device is arranged downstream of a first sidewall of two sidewalls and configured to draw in air from a corresponding at least one side opening during use and generate an airflow at an outlet along a first linear direction toward a side opening on a second sidewall, the first linear direction lying in a plane parallel to the horizontal plane.

[0027] At least one finned heat exchanger, arranged between the ventilation device and the second sidewall, is used to heat or cool the airflow.

[0028] The fan coil unit is characterized in that the at least one heat exchanger includes a plurality of fins parallel to each other relative to the vertical central axis, each fin having a planar surface with two side edges, a top edge, and a bottom edge, wherein the side edges are parallel to the central vertical axis, and the top and bottom edges are oriented along a first axis arranged in a plane parallel to the horizontal plane, thereby forming a plurality of flow channels for the airflow between an inlet surface formed by the first side edges of the plurality of fins and facing the ventilation device, and an outlet surface formed by the second side edges of the plurality of fins and facing the second sidewall.

[0029] The characteristic is that the ratio between the width of the air inlet surface of the at least one heat exchanger (measured along a second axis perpendicular to the first axis in a plane parallel to the horizontal plane) and the width of each of the sidewalls of the fan coil unit (measured along the transverse axis) is between 1:2 and 1:3, preferably about 1:2.6, and

[0030] The feature is that the at least one finned heat exchanger of the at least one heat exchange unit and the ventilation device are arranged in the housing compartment such that during use, when the fan coil unit is arranged with its vertical central axis parallel to the direction of gravity, the first axis of the plurality of fins is parallel to the first straight direction of the airflow leaving the at least one tangential impeller, or forms a first angle (measured on the horizontal plane) with the first straight direction, the first angle being between 0° and 30°, preferably between 0° and 10°, and more preferably between 0° and 5°.

[0031] Furthermore, according to the invention, the at least one heat exchanger may be arranged in the housing compartment such that the first axis of the plurality of fins is parallel to the horizontal axis, or tilted at a second angle relative to the horizontal axis, the second angle being between 0° and 30°.

[0032] Further according to the invention, the ratio between the height of the at least one heat exchanger and the height of the corresponding at least one side opening of the second sidewall is between 3:4 and 5:4, preferably 1, and the two heights are measured along the direction of the vertical central axis.

[0033] Furthermore, according to the invention, the ratio between the width of the air inlet surface of the at least one heat exchanger (measured particularly along the second axis) and the width of at least one side opening arranged on the second wall (measured along the transverse axis) is between 3:4 and 5:4, preferably 1.

[0034] Furthermore, according to the present invention, the at least one heat exchanger may provide a plurality of pipes adapted to circulate heat transfer fluid, arranged in a plurality of rows of one to four rows, preferably two or three rows.

[0035] In addition, according to the present invention, the fan coil unit may further include at least one first side compartment arranged along the horizontal axis between the at least one heat exchange unit and the second side wall, the at least one first side compartment being adapted to accommodate a plurality of hydraulic conduits and electronic control devices.

[0036] Further according to the invention, the ventilation device of the heat exchange unit includes two tangential impellers arranged adjacent to each other along a direction parallel to the vertical central axis, and their respective axes are aligned, wherein the ratio between the overall height of the two tangential impellers along the axis parallel to the vertical central y-axis and the height H of the at least one heat exchanger is between 1:1 and 1:1.1, preferably 1:1.05.

[0037] Furthermore, according to the present invention, the ratio between the width and the height of the at least one heat exchanger is between 1:10 and 1:40, preferably 1:20.

[0038] Furthermore, according to the present invention, the fan coil unit includes two heat exchange units, wherein the second heat exchange unit may be arranged adjacent to the first heat exchange unit in the housing compartment along the direction of the vertical central axis, and wherein the axis of the tangential impeller of the second heat exchange unit may be arranged to be aligned with the axis of the tangential impeller of the first heat exchange unit.

[0039] Additionally, according to the present invention, the fan coil unit may include two heat exchange units, wherein the ventilation device of the first heat exchange unit is arranged downstream of the side opening on the first side wall, and the at least one heat exchanger may be arranged between the corresponding ventilation device and the second side wall, wherein the ventilation device of the second heat exchange unit may be arranged downstream of the side opening on the second side wall, and the at least one corresponding heat exchanger may be arranged between the corresponding ventilation device and the first side wall.

[0040] Furthermore, according to the present invention, the ratio between the width and height of the at least one heat exchanger is between 1:5 and 1:20, preferably 1:10.

[0041] Furthermore, according to the present invention, the ventilation device of the at least one heat exchange unit may further include a flow deflection device for deflecting the airflow from the at least one tangential impeller along the first linear direction.

[0042] Further according to the invention, the flow deflection device includes two deflectors, each of which may have a substantially "L"-shaped profile, with its corresponding arm arranged parallel to the arm of the other deflector to form a substantially "L"-shaped channel, wherein at least one corresponding tangential impeller may be arranged between the two deflectors at a recess in the substantially "L"-shaped channel.

[0043] Furthermore, according to the present invention, the air inlet surface of the at least one heat exchanger may be arranged parallel to the transverse axis.

[0044] Further according to the invention, the ventilation device of the at least one heat exchange unit is configured such that the first linear direction of the airflow from the at least one impeller during use is parallel to the horizontal axis.

[0045] Furthermore, according to the invention, the ventilation device of the at least one heat exchange unit is configured such that during use, the inlet direction and / or outlet direction of the airflow through the at least one side opening of each of the side walls forms an angle with the horizontal axis (measured in a plane defined by the vertical central axis and the horizontal axis), the angle being between -20° and 20°, preferably 0°.

[0046] According to the invention further, the at least one side opening of the sidewall can be arranged symmetrically with respect to the central vertical axis and aligned with at least one side opening of the second sidewall along the same axis parallel to the horizontal axis. Attached Figure Description

[0047] The invention will now be described for illustrative and non-limiting purposes, with specific reference to the accompanying drawings, in which:

[0048] Figure 1 A front view of a fan coil unit according to the prior art is shown, wherein it does not have a front wall;

[0049] Figure 2 It shows Figure 1 Exploded perspective view of the fan coil unit;

[0050] Figure 3 It shows along Figure 1 A sectional view of the cross-section plane III-III' of the fan coil unit;

[0051] Figure 4 A front view of the fan coil unit according to the invention in the first embodiment is shown, wherein it does not have a front wall;

[0052] Figure 5 It shows Figure 4 Side view of the fan coil unit;

[0053] Figure 6 It shows along Figure 4 Front sectional view of the cross-sectional plane VI-VI' of the fan coil unit;

[0054] Figure 7 It shows Figure 4 Exploded perspective view of the fan coil unit;

[0055] Figure 8 It shows Figure 4 An exploded perspective view of one of the heat exchange units of a fan coil unit;

[0056] Figure 9 It shows Figure 8 A perspective view of the finned heat exchanger of the thermal unit;

[0057] Figure 10 It shows Figure 4 A perspective view of a fan coil unit, in which the front wall is dissected;

[0058] Figure 11 A perspective view of the fan coil unit according to the invention in the second embodiment is shown, wherein the front wall is dissected;

[0059] Figure 12 A perspective view of the fan coil unit according to the invention in the third embodiment is shown, wherein the front wall is dissected;

[0060] Figure 13 It shows along Figure 4 A cross-sectional view of the fan coil unit in plane XIII-XIII', which does not have hydraulic conduits and electronic control devices;

[0061] Figure 14 It shows along Figure 4 A cross-sectional view of the fan coil unit in plane XIV-XIV', in which the air path is highlighted;

[0062] Figure 15 A cross-sectional view is shown in the fourth embodiment along a plane parallel to the horizontal plane of the fan coil unit according to the invention, wherein the air path is highlighted; and

[0063] Figure 16 A cross-sectional view along a plane parallel to the horizontal plane of the fan coil unit according to the invention is shown in the fifth embodiment, wherein the air path is highlighted. Detailed Implementation

[0064] refer to Figures 4-10 and Figures 13-14 The fan coil unit according to the invention is shown in a first embodiment as indicated by reference numeral 100.

[0065] See details Figure 4 The fan coil unit 100 has a housing compartment with a parallelepiped volume, the housing compartment being enclosed by a lower wall 33, an upper wall 30, a first side wall 21 and a second side wall 21', a front wall 23 and a rear wall 20, each side wall 21, 21' being arranged in a position opposite to each other relative to the vertical central y-axis, the front wall preferably being insulated with foam material, which can be removed for installation, hydraulic connection, inspection or cleaning purposes, wherein the front wall 23 and the rear wall 20 are arranged in a position opposite to each other relative to the horizontal x-axis (which is perpendicular to the vertical central y-axis).

[0066] Specifically, the housing compartment is made of two “C”-shaped half-shells connected together along their respective ends, the two “C”-shaped half-shells forming the first sidewall 21 and the second sidewall 21' of the fan coil unit 100, as well as the upper wall 30 and the lower wall 33.

[0067] The fan coil unit 100 has an extension along the vertical y-axis in height, which is greater than its width measured along the horizontal x-axis perpendicular to the vertical y-axis, and greater than its depth measured along the transverse z-axis perpendicular to both the vertical y-axis and the horizontal x-axis.

[0068] The fan coil unit 100 is suitable for wall mounting, for example, by securing the rear wall 20 to a wall using suitable fasteners, or the fan coil unit can be mounted on the floor using a lower support fixed to the floor and the two "C"-shaped half-shells corresponding to the lower wall 33 of the fan coil unit 100.

[0069] The fan coil unit 100 includes at least one heat exchange unit 1, 2 arranged inside the housing compartment, the at least one heat exchange unit including a ventilation device 27 (which in turn includes at least one tangential impeller 24).

[0070] Some characteristic aspects can be understood by fabricating a segment of the fan coil unit 100 along a transverse plane parallel to the xy plane defined by both the horizontal x-axis and the central vertical y-axis. Specifically, refer to... Figure 4Ventilation device 27 (arranged downstream of the first of the two side walls 21, 21' and configured to draw in air from the respective side openings 22, 22') generates an airflow perpendicular to the outer surface (i.e., horizontal) of the side walls 21, 21', thus forming an angle of 0° with the horizontal x-axis. The airflow forms flow angles δin and δout relative to the horizontal x-axis at the inlet and outlet of the respective side openings 22, 22', which are between -20° and 20°, preferably 0°.

[0071] refer to Figure 8 Each heat exchange unit 1, 2 includes a tangential impeller 24 and a finned heat exchanger 25. The rotation axis of the tangential impeller is parallel to the vertical center y-axis. The finned heat exchanger is arranged between the ventilation device 27 and the second sidewalls 21', 21, and has multiple pipes 35 to allow circulation of the heat transfer fluid so as to achieve heat exchange between the airflow generated by the tangential impeller 24 and the heat transfer fluid, thereby achieving heating or cooling. The generated airflow passes through the heat exchanger 25, enters through the air inlet surface 26 (specifically the front surface 26) facing the ventilation device 27, and exits through the outlet surface 29 facing the second sidewalls 21', 21.

[0072] Further, the heat exchanger 25 includes a plurality of fins 25' parallel to each other along a first axis l perpendicular to the air inlet surface 26 and arranged vertically (i.e., parallel to the central y-axis) to form a plurality of channels for airflow generated by the ventilation device 27, such channels being parallel to each other along the first axis l. Specifically, each fin 25' has a planar surface with two side edges 252', 253', an upper edge 251', and a lower edge 254', the two side edges defining the air inlet surface 26 facing the ventilation device 27 and the outlet 29 facing the second sidewall 21'; 21. In particular, the side edges 252', 253' are arranged parallel to the vertical central y-axis, and the upper edge 251' and lower edge 254' are oriented along the first axis l, which is arranged in a plane parallel to the horizontal xz plane.

[0073] Therefore, the plurality of fins 25' define the usable area of ​​the heat exchanger 25, namely the area between the two folded metal plate supports, which allows them to be mechanically connected to other components, wherein heat exchange occurs between the airflow generated by the ventilation device 27 and the heat transfer fluid contained within the plurality of pipes 35.

[0074] The usable area of ​​heat exchanger 25 is defined by the following parameters:

[0075] • The material of the multiple pipes 35 is preferably copper;

[0076] • The outer diameter and thickness of the multiple pipes 35 are preferably D 9.52 x 0.28 mm;

[0077] • The spacing between multiple pipes 35, i.e. the distance between one pipe and the next pipe belonging to the same row, is preferably 25 mm;

[0078] • The spacing between rows, i.e. the distance between two consecutive rows, is preferably 21.65 mm;

[0079] • Material of the multiple fins 25': preferably hydrophilically treated aluminum to maximize the formation and collection of condensate;

[0080] • The shape and thickness of the multiple fins 25': preferably corrugated fins of 0.1 mm;

[0081] • The spacing between multiple fins 25', i.e. the distance between two consecutive fins, is preferably 2 mm.

[0082] The theoretical heat exchange power that can be obtained from the finned water-air heat exchanger 25 (such as the finned water-air heat exchanger according to the invention) depends on many parameters, including the parameters mentioned above, as well as the airflow rate of the tangential impeller 24, the temperature of the incoming air of the airflow generated by the ventilation device 27, the temperature of the water entering and leaving the heat exchanger 25, and the incident angle ε of the heat exchanger 25 relative to the airflow.

[0083] The plurality of pipes 35 are preferably organized into one or more rows, wherein, as previously described, the plurality of pipes 35 comprise pipes spaced 25 mm apart and have lateral bends, and the overall dimension of each end of the heat exchanger 25 is 25 mm. Therefore, the pipes affect the overall side dimension of the heat exchanger 25; in fact, due to the pipe spacing, lateral bends, and structurally necessary 25 mm of empty space of the pipes 35, an additional overall dimension of 75 mm must be added to the width W of the heat exchanger.

[0084] In view of this, in order to ensure convenient overall size and proper heat exchange of the fan coil unit 100, the ratio between the width W of the air inlet surface 26 of the heat exchanger 25 (measured along the second axis t perpendicular to the first axis l located on a plane parallel to the horizontal xz plane) and the width L of the sidewalls 21, 21' is expected to be between 1:2 and 1:3, preferably 1:2.6.

[0085] Therefore, the width W of the usable exchange area of ​​the heat exchanger 25 (corresponding to the width of the front face 26 of the heat exchanger 25 itself) is at a maximum value, which allows the overall depth of the fan coil unit 100 to be minimized according to the incident angle ε (defined by the airflow moving by the tangential impeller 24 and the direction of the front face 26 of the heat exchanger 25). Thus, due to the positioning of the heat exchanger 25, the overall size of the fan coil unit 100 along the horizontal x-axis also remains reduced, with the heat exchanger having a front face 26 that allows the incident angle ε to have a very high value, preferably 85°-90°, more preferably 90°. More specifically, the incident angle ε can also be between 60° and 90°, particularly between 80° and 90°.

[0086] In other words, the direction of the airflow f forms a first angle α with the first axis l along which the fins 25' are oriented, the first angle being between 0° and 30°, preferably between 0° and 10°, and more preferably between 0° and 5°. In the first embodiment (which can be Figure 14 As observed in the study, the first axis l of the fin 25' is parallel to the horizontal x-axis and the flow direction f that exits from the tangential impeller 24.

[0087] exist Figure 15 and Figure 16 Another characteristic angle (specifically, the second angle β) can be observed, in which the fourth and fifth embodiments of the fan coil unit 100 according to the present invention are shown respectively.

[0088] The second angle β, defined by the first axis l and the horizontal x-axis of the plurality of fins 25' of the heat exchanger 25, can be between 0° and 30°, and substantially represents the rotational or tilted arrangement of the heat exchanger 25 relative to the overall size of the fan coil unit 100.

[0089] The second angle β can be geometrically related to the minimum incident angle ε. The minimum incident angle varying from 60° to 90° determines that the second angle β can vary from 0° to 30°. Geometrically, ε = 90° corresponds to β = 0° (in the preferred embodiment), while ε = 60° corresponds to α = 30°. In the latter case (which can...) Figure 15 As observed in the study, guide fins located downstream of heat exchanger 25 may be needed to redirect airflow perpendicular to sidewalls 21, 21'. If guide fins are also installed upstream of heat exchanger 25, the correlation between the incident angle ε and the second angle β may cease, which still allows, for example, ε = 90°, β = 30°.

[0090] In both of the above cases, the proportions of the structural dimensions of the heat exchanger 25 remain unchanged.

[0091] In particular, in a preferred embodiment, the tangential impeller 24 has an outer diameter of 80 mm and a length of 600 mm along its axis of rotation, and is driven by a brushless motor powered by 230V AC, with the voltage regulated by a 0-10V signal or by pulse width modulation (PWM). The fan of the tangential impeller 24 has an absorption power of 25 W and delivers an overall flow rate of approximately 370 m³ / h.

[0092] In addition, each heat exchange unit 1, 2 can provide the connection profile necessary to structurally support the heat exchanger 25, and is further adapted to define the upstream and downstream channels and condensate collection trays of the heat exchanger 25 itself.

[0093] To conveniently occupy space and ensure proper heat exchange, the fan coil unit 100 according to the invention provides a tangential impeller 24, which is positioned such that its axis of rotation is parallel to the vertical center y-axis, thus being in a vertical position relative to a plane parallel to the mounting floor of the fan coil unit 100, and therefore in a position substantially parallel to gravity.

[0094] Preferably, in order to resist the axial pressure determined by gravity, the tangential impeller 24 can be provided with a thrust bearing.

[0095] Each heat exchanger 25 has multiple fins arranged vertically (in other words, parallel to the vertical center y-axis).

[0096] Specifically, each heat exchanger 25 has a narrow overall dimension in the depth direction along the said transverse z-axis and a tall dimension in the height direction along the said vertical central y-axis, thereby facilitating its positioning downstream of the tangential impeller 24, which is also arranged vertically, while keeping the overall depth of the fan coil unit 100 reduced.

[0097] refer to Figure 9The finned assembly of the heat exchanger 25 provides characteristic dimensions for the specific installation of the wall-mounted fan coil unit 100, which has a vertical volume. The height H of the heat exchanger 25 is slightly smaller than the height h of the air inlets 22, 22' of the sidewalls 21, 21' of the fan coil unit 100, in order to fully utilize its airflow rate. For example, in a preferred embodiment, the height h of the air inlets 22, 22' corresponds to 580 mm, on which corresponding 600 mm high grilles are interlocked, and the height of the sidewalls 21, 21' corresponds to 600 mm (i.e., the overall vertical dimension along the total vertical y-axis of the fan coil unit 100 itself). Generally, the ratio between the two heights h, H is expected to be between 3:5 and 5:4, preferably 1:1.

[0098] With reference to the width L of the sidewalls 21, 22 being between 110 mm and 140 mm, preferably 135 mm, the width W of the air inlet surface 26 of the heat exchanger 25 is designed such that the ratio between these two widths W and L is between 1:2 and 1:3, so as to allow the airflow leaving the heat exchanger 25 to flow properly outward through the sidewalls 21, 21' themselves.

[0099] The width W of the front face 26 of the heat exchanger 25 is preferably the same as the width w of the outlet openings 22, 22' of the side walls 21, 21' of the fan coil unit 100, wherein the width w of the outlet openings 22, 22' preferably corresponds to 46 mm. A corresponding 60 mm high grille is interlocked to such air inlet openings, and the width W of the heat exchanger preferably corresponds to 60 mm (i.e., the overall width of the fan coil unit 100 itself), thereby fully utilizing its airflow rate. Generally, the ratio between the two widths w, W is expected to be between 3:5 and 5:4, preferably 1:1.

[0100] In corresponding to respectively Figure 4 and Figure 11 In the first and second embodiments, the ratio of the width W of the front surface 26 to the height of the heat exchanger 25 is between 1:5 and 1:20, preferably 1:10; while corresponding to Figure 12 In the third embodiment, the ratio of the width W of the front surface 26 to the height of the heat exchanger 25 is between 1:10 and 1:40, preferably 1:20.

[0101] Regarding the incident angle ε, if the angle changes and the finned battery of the heat exchanger 25 is therefore tilted, a larger width W is theoretically possible, but the perpendicularity of the airflow generated by the tangential impeller 24 to the front face 26 of the heat exchanger 25 (i.e., a key parameter for the heat exchange efficiency of this type of heat exchanger 25) will be lost.

[0102] Assuming that the airflow leaving the tangential impeller 24 is deflected (especially bent) at the inlet of the fin assembly of the heat exchanger 25 in order to potentially increase the width W of the heat exchanger 25 itself, a corresponding subsequent reverse curvature at the outlet will be necessary to align the leaving airflow with the sidewalls 21, 21' of the fan coil unit 100.

[0103] However, this technical solution will mean pressure loss, which will negatively impact the efficiency of the heat exchanger 25 and the noise of the fan coil unit 100 itself. Finally, the thickness T measured along the horizontal x-axis is the thickness of the fin assembly of the heat exchanger 25, and it depends directly on the number of rows of the exchanger itself, with an optimal value between 1 and 4 rows, preferably 2 to 3 rows.

[0104] Inside the housing compartment of the fan coil unit 100, at a location next to each heat exchange unit 1, 2, at least one first side compartment may be arranged along the horizontal x-axis between the at least one heat exchange unit 1, 2 and the second sidewalls 21', 21, and configured to accommodate hydraulic circuits and / or electrical devices, such as inlet pipe 17a and outlet pipe 17b, hydraulic connection valve 18, condensate discharge pipe, internal wiring, power board, and user interface unit 19.

[0105] refer to Figure 14 Through more in-depth aerodynamic analysis, it can be observed that, compared with the prior art, the air path inside heat exchange units 1 and 2 is significantly more linear and has less efficiency loss. Furthermore, compared with heat exchangers known in the prior art installed in fan coil units, the incident angle between the air and the exchanger, represented by angle ε, is set to a significantly higher value (between 60° and 90°, preferably between 85° and 90°, but ideally 90°, i.e., the maximum theoretical exchange condition for the same airflow rate and the same exchanger size), where the incident angle γ is as high as 10°, for example, reference... Figure 3 .

[0106] refer to Figure 10 and Figure 12 The illustration shows three different embodiments of the fan coil unit 100 according to the present invention, which means that the airflow circulation pattern is different depending on the specific orientation of the heat exchange units 1 and 2.

[0107] exist Figure 4 and Figure 11 In the first and second embodiments shown, there are two heat exchange units 1 and 2, each including a corresponding tangential impeller 24; however, in other embodiments (e.g.) Figure 12 In the third embodiment shown, it can be specified that only one heat exchange unit 1, 2 exists, which includes two tangential impellers 24 arranged along an axis parallel to the vertical y-axis. When a second heat exchange unit 2, 1 is provided, the second heat exchange unit is arranged in the housing compartment adjacent to the first heat exchange unit 1, 2 along the direction of the vertical central y-axis, wherein the axis of the tangential impeller 24 of the second heat exchange unit 2, 1 coincides with the axis of the tangential blades of the first heat exchange unit 1, 2.

[0108] exist Figure 10 In the first embodiment, there are two heat exchange units 1; 2, which are arranged adjacent to each other and along a direction parallel to the central y-axis. Each heat exchange unit 1; 2 generates airflow along a corresponding horizontal direction f parallel to the horizontal or longitudinal x-axis, but in the case of opposing flow directions, the two heat exchange units 1; 2 are oriented relative to each other. Therefore, in this first embodiment, the two heat exchange units 1, 2 are oriented in a mirror and opposing manner. Figure 11 In the second embodiment shown, there are still two heat exchange units 1 and 2 oriented on the same side.

[0109] In the second embodiment, the ventilation device 27 of the first heat exchange unit 1; 2 is arranged downstream of the side opening 22; 22' on the first sidewall 21; 21', while the at least one heat exchanger 25 is positioned between the corresponding ventilation device 27 and the second sidewall 21'; 21. Then, the ventilation device 27 of the second heat exchange unit 2; 1 is arranged downstream of the side opening 22'; 22 on the second sidewall 21'; 21, while the corresponding at least one heat exchanger 25 is arranged between the corresponding ventilation device 27 and the first sidewall 21, 21'; therefore, such ventilation device 27 (specifically a tangential impeller) will generate an airflow with a consistent flow direction along a corresponding horizontal direction f parallel to the longitudinal x-axis.

[0110] This embodiment has many advantages, specifically:

[0111] - This reduces the risk of a loop between the outlet opening 22 of one heat exchange unit 1 and the inlet of another heat exchange unit 2;

[0112] - The hydraulic system layout for controlling the two exchangers 25 of each heat exchange unit 1, 2 is simplified (i.e., a more linear path is created for the heat transfer fluid used, resulting in lower pressure loss); and

[0113] - The clearer separation between the hydraulic control system side (on the heat exchanger 25 side of each heat exchange unit 1, 2) and the electrical control system side (on the controller, power PCB and electric motor power supply side) results in a significant improvement in product safety.

[0114] Furthermore, in this embodiment, the user's perception of the heating / cooling effect of the environment is enhanced because the air exiting from the opening 22' is hot / cold along its entire height h (measured along an axis parallel to the y-axis).

[0115] Finally, regarding Figure 12 A third embodiment of a fan coil unit 100 according to the invention is shown, which provides a single heat exchange unit 1 comprising two tangential impellers 24 arranged adjacent to each other along a direction parallel to a central vertical y-axis, with their respective axes of rotation aligned. The overall height of the two tangential impellers 24 along the axis parallel to the vertical y-axis is preferably equal to the height H of the at least one heat exchanger 25. This embodiment allows for a significant simplification of the hydraulic design of the fan coil unit 100, as it has only one heat exchanger 25. In a possible construction scheme for implementing the third embodiment, the overall height of the two tangential impellers 24 can be 1200 mm (each of the aligned impellers has a length of 600 mm), while the height H of the at least one heat exchanger 25 can correspond to 1250 mm. Due to construction requirements, the height H is slightly higher than the overall height of the two tangential impellers 24, as the space occupied by the supports of the tangential impellers 24 needs to be considered. Therefore, the ratio between the overall height of the two tangential impellers 24 along the axis parallel to the vertical y-axis and the height H of the at least one heat exchanger 25 can be between 1:1 and 1:1.1, preferably 1:1.05.

[0116] Therefore, such ventilation devices 27 (specifically tangential impellers) will generate airflow with a consistent flow direction along a corresponding horizontal direction f parallel to the longitudinal x-axis, passing through the same heat exchanger 25.

[0117] All three embodiments of the fan coil unit 100 according to the present invention have an overall dimension between 450 and 550 mm in width and between 1600 and 2000 mm in height, preferably 500 and 1800 mm respectively.

[0118] Advantageously, the fan coil unit 100 according to the invention is suitable for use in residential applications due to its main vertical dimension along the central vertical y-axis and its reduced thickness, having sufficient thermal power for such applications in terms of cooling and heating, and in particular, better thermal performance at the same width compared to prior art fan coil units, and conveniently occupying the space in which they are installed.

[0119] Furthermore, the fan coil unit 1 according to the invention allows the airflow generated by the ventilation device 27 to be guided along a less tortuous path compared to the prior art, uniformly reaching all parts of the heat exchange unit 25, thus ensuring that every part of the heat exchanger 25 is engaged in heat exchange. In fact, the arrangement and dimensions of the components of the fan coil unit 1 according to the invention (e.g., the vertical orientation of the tangential impeller 24 and the dimensions of the fin assembly of the heat exchanger 25) eliminate the presence of "dead zones" (i.e., the presence of airflow recirculation or poor flow), thus minimizing their participation in heat exchange with the heat exchanger 25.

[0120] Another advantage of the fan coil unit 1 according to the invention is that, due to the vertical orientation of the plurality of fins 25' parallel to the vertical center y-axis, it is possible to ensure the proper discharge of condensate from the heat exchange unit 25, while avoiding the accumulation of dust on the plurality of fins 25' themselves.

[0121] The vertical arrangement of the components constituting the fan coil unit 100 still advantageously allows for the use of a tangential impeller 24 with a greater length than that used in prior art fan coil units (which are arranged with their axis of rotation in a horizontal position), thus allowing for a greater airflow rate driven by the tangential impeller 24 itself. Therefore, this determines an unprecedented air circulation compared to conventional fan coil units, because in this case, the preferred direction of flow and gravity (which causes air stratification) are no longer aligned, but rather perpendicular to each other.

[0122] Finally, advantageously, the fan coil unit 100 according to the invention allows for the same heat exchange performance as prior art fan coil units, however, with a significantly smaller theoretical impact area (the theoretical surface of the heat transfer fluid passing through the front face 26 of the heat exchange unit 25).

[0123] Preferred embodiments have been described above and some variations of the invention have been proposed. However, it should be understood that those skilled in the art can make modifications and changes without departing from the relevant scope of protection defined by the appended claims.

Claims

1. A fan coil unit (100) having a shell compartment with a parallelepiped volume, said shell compartment being enclosed by a lower wall (33), an upper wall (30), a front wall (23), a rear wall (20), and two side walls (21, 21'), each side wall (21, 21') being opposite to each other with respect to a vertical central axis (y), wherein, There is at least one side opening (22, 22') on each sidewall (21, 21'). The front wall (23) and the rear wall (20) are opposite each other with respect to the horizontal axis (x) perpendicular to the vertical central axis (y). The two sidewalls (21, 21') are opposite each other with respect to the transverse axis (z), which is perpendicular to the central vertical axis (y) and the horizontal axis (x). The fan coil unit (100) includes at least one heat exchange unit (1, 2) arranged in the housing compartment. The at least one heat exchange unit (1, 2) includes A ventilation device (27) comprising at least one tangential impeller (24) with its axis parallel to the vertical central axis (y), the ventilation device (27) being arranged downstream of the first of the two sidewalls (21; 21') and configured to draw air from a corresponding at least one side opening (22; 22') during use and generate an airflow at the outlet along a first linear direction (f) toward the side opening (22'; 22) on the second sidewall (21'; 21), the first linear direction being located in a plane parallel to the horizontal plane (xz). At least one finned heat exchanger (25) is arranged between the ventilation device (27) and the second sidewall (21'; 21) for heating or cooling the airflow. The fan coil unit (100) is characterized in that the at least one heat exchanger (25) includes a plurality of fins (25') parallel to each other relative to the vertical central axis (y), each fin (25') having a planar surface having two side edges (252', 253'), a top edge (251') and a bottom edge (254'), wherein the side edges (252', 253') are parallel to the central vertical axis (y), and the top edge (251') and The bottom edge (254') is oriented along a first axis (l) arranged on a plane parallel to the horizontal plane (xz), thereby forming a plurality of flow channels for the airflow between the air inlet surface (26) formed by the first side edges (252; 253') of the plurality of fins (25') and facing the ventilation device (27) and the outlet surface (29) formed by the second side edges (252'; 253') of the plurality of fins (25') and facing the second sidewall (21'; 21). The ratio between the width (W) of the air inlet surface (26) of the at least one heat exchanger (25) measured along a second axis (t) perpendicular to the first axis (l) located on a plane parallel to the horizontal plane (xz) and the width (L) of each of the sidewalls (21, 21') of the fan coil unit (100) measured along the transverse axis (z) is between 1:2 and 1:3, preferably about 1:2.6, and In this arrangement, the at least one finned heat exchanger (25) of the at least one heat exchange unit (1, 2) and the ventilation device (27) are arranged in the housing compartment such that during use, when the fan coil unit (100) is arranged such that its vertical central axis (y) is parallel to the direction of gravity, the incident angle (ε) of the first straight direction (f) of the airflow leaving the at least one tangential impeller (24) relative to the second axis (t) located on the air inlet surface (26) of the at least one heat exchanger (25), measured on the horizontal plane (xz), is between 60° and 90°, preferably between 80° and 90°, more preferably between 85° and 90°, and particularly 90°.

2. A fan coil unit (100) having a shell compartment with a parallelepiped volume, said shell compartment being enclosed by a lower wall (33), an upper wall (30), a front wall (23), a rear wall (20), and two side walls (21, 21'). Each sidewall (21, 21') is opposite to each other with respect to the vertical central axis (y), and each sidewall (21, 21') has at least one side opening (22, 22'). The front wall (23) and the rear wall (20) are opposite each other with respect to the horizontal axis (x) perpendicular to the vertical central axis (y). The two sidewalls (21, 21') are opposite each other with respect to the transverse axis (z), which is perpendicular to the central vertical axis (y) and the horizontal axis (x). The fan coil unit (100) includes at least one heat exchange unit (1, 2) arranged in the housing compartment. The at least one heat exchange unit (1, 2) includes A ventilation device (27) comprising at least one tangential impeller (24) with its axis parallel to the vertical central axis (y), the ventilation device (27) being disposed downstream of the first of the two sidewalls (21; 21') and configured to draw air from a corresponding at least one side opening (22; 22') during use and generate an airflow at an outlet along a first linear direction (f) toward the side opening (22'; 22) on the second sidewall (21'; 21), the first linear direction being located in a plane parallel to the horizontal plane (xz). At least one finned heat exchanger (25) is arranged between the ventilation device (27) and the second sidewall (21'; 21) for heating or cooling the airflow. The fan coil unit (100) is characterized in that the at least one heat exchanger (25) includes a plurality of fins (25') parallel to each other relative to the vertical central axis (y), each fin (25') having a planar surface having two side edges (252', 253'), a top edge (251'), and a bottom edge (254'), wherein, The side edges (252', 253') are parallel to the central vertical axis (y), and the top edge (251') and the bottom edge (254') are oriented along a first axis (l) arranged on a plane parallel to the horizontal plane (xz), thereby forming a plurality of flow channels for the airflow between the air inlet surface (26) formed by the first side edges (252'; 253') of the plurality of fins (25') and facing the ventilation device (27) and the outlet surface (29) formed by the second side edges (252'; 253') of the plurality of fins (25') and facing the second sidewall (21'; 21). The ratio between the width (W) of the air inlet surface (26) of the at least one heat exchanger (25) measured along a second axis (t) perpendicular to the first axis (l) located on a plane parallel to the horizontal plane (xz) and the width (L) of each of the sidewalls (21, 21') of the fan coil unit (100) measured along the transverse axis (z) is between 1:2 and 1:3, preferably about 1:2.6, and The at least one finned heat exchanger (25) of the at least one heat exchange unit (1, 2) and the ventilation device (27) are arranged in the housing compartment such that during use, when the fan coil unit (100) is arranged such that its vertical central axis (y) is parallel to the direction of gravity, the first axis (l) of the plurality of fins (25') is parallel to the first straight direction (f) of the airflow leaving the at least one tangential impeller (24), or forms a first angle (α) with the first straight direction (f), the first angle being measured on the horizontal plane (xz), the first angle being between 0° and 30°, preferably between 0° and 10°, more preferably between 0° and 5°.

3. The fan coil unit (100) according to claim 1 or 2, wherein, The at least one heat exchanger (25) is arranged in the housing compartment such that the first axis (l) of the plurality of fins (25') is parallel to the horizontal axis (x), or tilted at a second angle (β) relative to the horizontal axis (x), the second angle being between 0° and 30°.

4. The fan coil unit (100) according to any one of the preceding claims, wherein, The ratio between the height (H) of the at least one heat exchanger (25) and the height (h) of the corresponding at least one side opening (22, 22') of the second sidewall (21'; 21) is between 3:4 and 5:4, preferably 1, with both heights measured along the direction of the vertical central axis (y).

5. The fan coil unit (100) according to any one of the preceding claims, wherein, The ratio between the width (W) of the air inlet surface (26) of the at least one heat exchanger (25) measured along the second axis (t) and the width (w) of at least one side opening (22, 22') arranged on the second wall (21'; 21) measured along the transverse axis (z) is between 3:4 and 5:4, preferably 1.

6. The fan coil unit (100) according to any one of the preceding claims, wherein, The at least one heat exchanger (25) provides a plurality of pipes (35) adapted to circulate heat transfer fluid in a plurality of rows arranged in one to four rows, preferably two or three rows.

7. The fan coil unit (100) according to any one of the preceding claims, wherein, The fan coil unit (100) further includes at least one first side compartment (1', 2'), which is arranged along the horizontal axis (x) between the at least one heat exchange unit (1, 2) and the second side wall (21', 21), and the at least one first side compartment (1', 2') is adapted to accommodate a plurality of hydraulic conduits and electronic control devices.

8. The fan coil unit (100) according to any one of the preceding claims, wherein, The ventilation device (27) of the heat exchange unit (1) includes two tangential impellers (24) arranged adjacent to each other along a direction parallel to the vertical central axis (y), with the respective axes of the two tangential impellers aligned, wherein the ratio between the overall height of the two tangential impellers (24) along the axis parallel to the vertical central axis (y) and the height (H) of the at least one heat exchanger (25) is between 1:1 and 1:1.1, preferably 1:1.

05.

9. The fan coil unit (100) according to the preceding claims, wherein, The ratio between the width (W) and the height (H) of the at least one heat exchanger (25) is between 1:10 and 1:40, preferably 1:

20.

10. The fan coil unit (100) according to any one of claims 1-7, wherein, The fan coil unit includes two heat exchange units (2; 1). The second heat exchange unit (2; 1) is arranged adjacent to the first heat exchange unit (1; 2) in the housing compartment along the direction of the vertical central axis (y), and the axis of the tangential impeller (24) of the second heat exchange unit (2, 1) is arranged to be aligned with the axis of the tangential impeller (24) of the first heat exchange unit (1; 2).

11. The fan coil unit (100) according to any one of claims 1-7, wherein, The fan coil unit (100) includes two heat exchange units (1, 2). In this embodiment, the ventilation device (27) of the first heat exchange unit (1; 2) is arranged downstream of the side opening (22; 22') on the first side wall (21; 21'), and the at least one heat exchanger (25) is arranged between the corresponding ventilation device (27) and the second side wall (21'; 21). The ventilation device (27) of the second heat exchange unit (2; 1) is arranged downstream of the side opening (22'; 22) on the second side wall (21'; 21), and at least one heat exchanger (25) is arranged between the corresponding ventilation device (27) and the first side wall (21', 21).

12. The fan coil unit (100) according to any one of claims 1-7 or 10-11, wherein, The ratio between the width (W) and height (H) of the at least one heat exchanger (25) is between 1:5 and 1:20, preferably 1:

10.

13. The fan coil unit (100) according to any one of the preceding claims, wherein, The ventilation device (27) of the at least one heat exchange unit (1; 2) further includes an airflow deflector (240) for deflecting airflow from the at least one tangential impeller (24) along the first linear direction (f).

14. The fan coil unit (100) according to the preceding claim, wherein, The airflow deflection device (240) includes two deflectors (241, 242), each deflector (241; 242) having a substantially "L"-shaped profile, with its corresponding arms (241a, 241b; 242a, 242b) arranged parallel to the arms (242a, 242b; 241a, 241b) of the other deflector (242; 241), thereby forming a substantially "L"-shaped channel, wherein at least one corresponding tangential impeller (24) is arranged between the two deflectors (241, 242) at a recess in the substantially "L"-shaped channel.

15. The fan coil unit (100) according to any one of the preceding claims, wherein, The air inlet surface (26) of the at least one heat exchanger (25) is arranged parallel to the transverse axis (z).

16. The fan coil unit (100) according to any one of the preceding claims, wherein, The ventilation device (27) of the at least one heat exchange unit (1; 2) is configured such that during use, the first linear direction (f) of the airflow from the at least one tangential impeller (24) is parallel to the horizontal axis (x).

17. The fan coil unit (100) according to any one of the preceding claims, wherein, The ventilation device (27) of the at least one heat exchange unit (1, 2) is configured such that during use, the inlet direction (g) and / or outlet direction (h) of the airflow through the at least one side opening (22; 22') of each of the side walls (21, 21') forms an angle (δ) with the horizontal axis (x), the angle being measured in a plane (xy) defined by the vertical central axis (y) and the horizontal axis (x), the angle being between -20° and 20°, preferably 0°.

18. The fan coil unit (100) according to any one of the preceding claims, wherein, The at least one side opening (22, 22') of the sidewall (21, 21') is arranged symmetrically with respect to the vertical central axis (y) and aligned with at least one side opening (22, 22') of the second sidewall (21, 21') along the same axis parallel to the horizontal axis (x).

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