Vertically developed fan coil unit

Abstract

The present invention concerns a fan coil unit (100) having a housing compartment with a parallelepiped volume, said housing 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 the other with respect to a vertical central axis (y), with at least one side opening (22, 22') being present on each side wall (21, 21 '), said front (23) and rear (20) walls being opposite to each other with respect to a horizontal axis (x) perpendicular to said vertical central axis (y). Said fan coil unit (100) comprises at least one heat exchange unit (1, 2) arranged in said housing compartment. In particular, said at least one heat exchange unit (1, 2) comprises ventilation means (27) comprising at least one tangential impeller (24) having its axis parallel to said vertical central axis (y), said ventilation means (27) being arranged downstream of a first one of the two side walls (21; 21') and being configured to draw air from the respective at least one side opening (22; 22') and generate an airflow along a first rectilinear direction (f) towards the side opening (22'; 22) on the second side wall (21'; 21). Furthermore, said heat exchange unit (1, 2) comprises at least one finned pack heat exchanger (25) arranged between said ventilation means (27) and said second side wall (21; 21) for heating or cooling said airflow, said at least one heat exchanger (25) comprising a plurality of fins (25') arranged parallel to said vertical central axis (y) so as to form a plurality of flow ducts for said airflow between an intake face (26), facing said ventilation means (27), and an outlet face (29), facing said second side wall (21; 21). Said fan coil unit (100) is characterized in that the ratio between the width (W) of said intake face (26) of said at least one heat exchanger (25) and the width (L) of each of said side walls (21, 21') of said fan coil unit (100) is between 1 :2 and 1 :3, preferably about 1 :2.6, and in that said ventilation means (27) of said at least one heat exchange unit (1, 2) are configured in such a way that, during use, the angle of incidence (E), along said first direction (f) of the airflow coming from said at least one tangential impeller (24) with respect to said intake face (26) of said at least one heat exchanger (25), is between 60° and 90°, preferably between 80° and 90°, more preferably between 85° and 90°.

Description

[0001] VERTICALLY DEVELOPED FAN COIL UNIT

[0002] The present invention concerns a vertically developed fan coil.

[0003] More precisely, the present invention concerns a vertically developed fan coil unit for domestic use, designed to be wall-mounted.

[0004] In the state of the art, wall-mounted domestic fan coil units are mainly used in a below-window configuration. This configuration is characterized by the development of the fan coil unit structure along the horizontal dimension, in width, based on the power level.

[0005] In this type of configuration, the thermal unit (the element adapted to carry out the heat exchange) is designed with a vertical development, in order to minimize the overall depth. In order to maximize the thermal energy exchange for the same overall product dimensions, the heat exchange surface of the thermal unit is appropriately inclined relative to the vertical, at the expense, however, of a greater thickness for the same effective thickness of the thermal unit. The ventilation element of the thermal unit, such as a tangential impeller with the axis arranged horizontally width-wise, is positioned either below (push flow) or above (suction flow) the heat exchange surface. The ventilation element, when arranged below the exchange surface, draws air from the external environment and pushes it upwards through the heat exchange unit. Although this type of configuration makes it possible to exploit the phenomenon of thermal convection, it presents performance issues. In fact, due to its positioning, the impeller performs less efficiently than it potentially could, given the phenomenon of thermal stratification of the air inside the fan coil unit and the pressure of the air column acting on the impeller. In order to achieve better performances, to counteract the effect of stratification and the air column above said element, it would be necessary to increase its size, thus increasing the energy consumption required for its movement and also the overall dimensions of the fan coil unit itself.

[0006] Furthermore, for living applications, this type of solution would be more cumbersome, a key ergonomic criterion for a potential buyer, and would also present thermal efficiency levels that could be improved.

[0007] Patent document JP H02 71027 A describes a construction model of a fan coil unit with a package exchanger having a “V” shaped section, placed between two tangential impellers with a vertical axis, where the heat exchangers have the same configuration as traditional fan coil units, wherein the intake face of the air to be heated / cooled of the exchangers is inclined at an angle of about 20° - 30° relative to the back wall of the fan coil unit and arranged in such a way as to cause a tortuous movement of the air, resulting in a loss of energy efficiency, as not all portions of the heat exchangers are equally reached by the same airflow.

[0008] The aim of the present invention is to overcome the issues of the prior art and, in particular, to obtain a vertical fan coil unit for living applications, having optimal thermal performances in both cooling and heating compared to conventional fan coil units (for the same size).

[0009] A further aim of the present invention is to reduce the thickness of the fan coil unit.

[0010] Another aim of the present invention is to improve the efficiency of the heat exchanger so that the airflow to be heated uniformly reaches the exchanger.

[0011] It is an object of the present invention, a fan coil unit having a housing compartment with a parallelepiped volume, said 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 the other with respect to a vertical central axis, with at least one side opening being present on each side wall, said front and rear walls being opposite to each other with respect to a horizontal axis, perpendicular to said vertical central axis, said fan coil unit comprising at least one heat exchange unit arranged in said housing compartment, said at least one heat exchange unit comprising ventilation means comprising at least one tangential impeller having its axis parallel to said vertical central axis, said ventilation means being arranged downstream of a first one of the two side walls and being configured to draw air from the respective at least one side opening and generate an airflow along a first direction towards the side opening on the second side wall, and at least one finned pack heat exchanger arranged between said ventilation means and said second side wall for heating or cooling said airflow, said at least one heat exchanger comprising a plurality of fins arranged parallel to said vertical central axis so as to form a plurality of flow ducts for said airflow between an intake face, facing said ventilation means, and an outlet face, facing said second side wall, said fan coil unit being characterized in that the ratio between the width of said intake face of said at least one heat exchanger and the width of each of said side walls of said fan coil unit is between 1 :2 and 1 :3, preferably about 1 :2.6, and in that said ventilation means of said at least one heat exchange unit are configured in such a way that, during use, the angle of incidence along said first direction of the airflow coming from said at least one tangential impeller with respect to said intake face of said at least one heat exchanger is between 60° and 90°, preferably between 80° and 90°, more preferably between 85° and 90°.

[0012] In addition, it is an object of the present invention a fan coil unit having a housing compartment with a parallelepiped volume, said 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 the other with respect to a vertical central axis, with at least one side opening being present on each side wall, said front and rear walls being opposite to each other with respect to a horizontal axis perpendicular to said vertical central axis, said two side walls being opposite to each other with respect to a transverse axis, said transverse axis being perpendicular to said central vertical axis and to said horizontal axis, said fan coil unit comprising at least one heat exchange unit arranged in said housing compartment, said at least one heat exchange unit comprising ventilation means comprising at least one tangential impeller having its axis parallel to said vertical central axis, said ventilation means being arranged downstream of a first one of the two side walls and being configured, during use, to draw air from the respective at least one side opening and generate at the outlet an airflow along a first rectilinear direction lying on planes parallel to the horizontal plane towards the side opening on the second side wall, and at least one finned pack heat exchanger arranged between said ventilation means and said second side wall for heating or cooling said airflow, said fan coil unit being characterized in that said at least one heat exchanger comprises a plurality of fins parallel to each other with respect to said vertical central axis, each fin having a planar surface having two side edges, a top edge and a bottom edge, wherein the side edges are parallel to said central vertical axis and the top edge and the bottom edge are oriented along a first axis arranged on a plane parallel to said horizontal plane, so as to form a plurality of flow ducts for said airflow between an intake face, formed by the first side edges of said plurality of fins and facing said ventilation means, and an outlet face, formed by the second side edges of said plurality of fins and facing said second side wall, in that the ratio between the width of said intake face of said at least one heat exchanger, measured along a second axis perpendicular to said first axis on a plane parallel to said horizontal plane, and the width of each of said side walls, measured along said transverse axis, of said fan coil unit is between 1 :2 and 1 :3, preferably about 1 :2.6, and in that said at least one finned pack heat exchanger and said ventilation means of said at least one heat exchange unit are arranged in said housing compartment such that, during use, when said fan-coil unit is arranged with its vertical central axis parallel to the direction of gravity, the angle of incidence, measured on said horizontal plane, between said first rectilinear direction of the airflow exiting from said at least one tangential impeller with respect to the second axis laying on said intake face of said at least one heat exchanger is between 60° and 90°, preferably between 80° and 90°, more preferably between 85° and 90°, in particular is 90°.

[0013] It is another object of the present invention a fan coil unit having a housing compartment with a parallelepiped volume, said 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 the other with respect to a vertical central axis, with at least one side opening being present on each side wall, said front and rear walls being opposite to each other with respect to a horizontal axis perpendicular to said vertical central axis, said two side walls being opposite to each other with respect to a transverse axis, said transverse axis being perpendicular to said central vertical axis and to said horizontal axis, said fan coil unit comprising at least one heat exchange unit arranged in said housing compartment, said at least one heat exchange unit comprising ventilation means comprising at least one tangential impeller having its axis parallel to said vertical central axis, said ventilation means being arranged downstream of a first one of the two side walls and being configured, during use, to draw air from the respective at least one side opening and generate at the outlet an airflow along a first rectilinear direction lying on planes parallel to the horizontal plane towards the side opening on the second side wall, and at least one finned pack heat exchanger arranged between said ventilation means and said second side wall for heating or cooling said airflow, said fan coil unit being characterized in that said at least one heat exchanger comprises a plurality of fins parallel to each other with respect to said vertical central axis, each fin having a planar surface having two side edges, a top edge and a bottom edge, wherein the side edges are parallel to said central vertical axis and the top edge and the bottom edge are oriented along a first axis arranged on a plane parallel to said horizontal plane, so as to form a plurality of flow ducts for said airflow between an intake face, formed by the first side edges of said plurality of fins and facing said ventilation means, and an outlet face, formed by the second side edges of said plurality of fins and facing said second side wall, in that the ratio between the width of said intake face of said at least one heat exchanger, measured along a second axis perpendicular to said first axis on a plane parallel to said horizontal plane, and the width of each of said side walls, measured along said transverse axis, of said fan coil unit is between 1 :2 and 1 :3, preferably about 1 :2.6, and in that said at least one finned pack heat exchanger and said ventilation means of said at least one heat exchange unit are arranged in said housing compartment such that, during use, when said fan-coil unit is arranged with its vertical central axis parallel to the direction of gravity, said first axis of said plurality of fins is parallel to said first rectilinear direction of the airflow exiting from said at least one tangential impeller or forms with said first rectilinear direction a first angle between 0° and 30°, preferably between 0° and 10°, more preferably between 0° and 5°, measured on said horizontal plane.

[0014] In addition, according to the invention, said at least one heat exchanger may be arranged in said housing compartment in such a way that said first axis of said plurality of fins is parallel to said horizontal axis or is inclined with respect to said horizontal axis by a second angle between 0° and 30°.

[0015] Further according to the invention, the ratio between the height of said at least one heat exchanger, and the height of said respective at least one side opening of said second side wall, measured along the direction of said vertical central axis, may be between 3:4 and 5:4, preferably 1 .

[0016] Furthermore, according to the invention, the ratio between said width of said intake face of said at least one heat exchanger, in particular measured along said second axis, and the width of the at least one side opening arranged on said second wall, measured along said transverse axis, may be between 3:4 and 5:4, preferably 1 .

[0017] Moreover, according to the invention, said at least one heat exchanger may provide a plurality of ducts, adapted to circulate a heat transfer fluid, arranged in a number of ranks between one and four, preferably two or three.

[0018] In addition, according to the invention, said fan coil unit may further comprise at least one first side compartment arranged between said at least one heat exchange unit and said second side wall, along said horizontal axis, said at least one first side compartment being adapted to house a plurality of hydraulic conduits and electronic control means.

[0019] Further according to the invention, said ventilation means of a heat exchange unit may comprise two tangential impellers arranged adjacent to each other along a direction parallel to said vertical central axis with their respective axes aligned, wherein the ratio between the overall height of said two tangential impellers along an axis parallel to the vertical central y-axis and the height H of said at least one heat exchanger may be between 1 :1 and 1 :1.1 , preferably 1 :1 .05.

[0020] Moreover, according to the invention the ratio between said width and said height of said at least one heat exchanger may be between 1 :10 and 1 :40, preferably 1 :20.

[0021] Furthermore, according to the invention, said fan coil unit may comprise two heat exchange units, wherein a second heat exchange unit may be arranged in said housing compartment adjacent to a first heat exchange unit along the direction of said vertical central axis, and wherein the axis of said tangential impeller of said second heat exchange unit may be arranged aligned with the axis of the tangential impeller of the first heat exchange unit.

[0022] In addition, according to the invention, said fan coil unit may comprise two heat exchange units, wherein the ventilation means of a first heat exchange unit may be arranged downstream of the side opening on said first side wall and said at least one heat exchanger may be arranged between the respective ventilation means and said second side wall, wherein the ventilation means of a second heat exchange unit may be arranged downstream of the side opening on said second side wall and the respective at least one heat exchanger may be arranged between the respective ventilation means and said first side wall. Further according to the invention, the ratio between the width and the height of said at least one heat exchanger may be between 1 :5 and 1 :20, preferably 1 :10.

[0023] Moreover, according to the invention, said ventilation means of said at least one heat exchange unit may further comprise flow deflection means for deflecting said airflow, coming from said at least one tangential impeller, along said first rectilinear direction.

[0024] Further according to the invention, said airflow deflection means may comprise two deflectors, each deflector may have a substantially “L-shaped” profile with the respective arms arranged parallel to the arms of the other deflector such as to form a substantially “L-shaped” passage channel, wherein the respective at least one tangential impeller may be arranged between said two deflectors at the concavity of said substantially “L-shaped” passage channel.

[0025] Furthermore, according to the invention, said intake face of said at least one heat exchanger may be arranged parallel to said transverse axis.

[0026] Further according to the invention, said ventilation means of said at least one heat exchange unit may be configured so that, during use, said first rectilinear direction of said airflow coming from said at least one impeller is parallel to said horizontal axis.

[0027] In addition, according to the invention, said ventilation means of said at least one heat exchange unit may be configured such that, during use, the inlet direction and / or outlet direction of the airflow through said at least one side opening of each of said side walls forms an angle between -20° and 20°, preferably 0°, with said horizontal axis, measured in a plane defined by said vertical central axis and said horizontal axis.

[0028] Further according to the invention, said at least one side opening of said side wall may be arranged symmetrically with respect to said central vertical axis and aligned, along the same axis parallel to said horizontal axis, with the at least one side opening of said second side wall.

[0029] The invention will now be described for illustrative but not limitative purposes, with particular reference to the drawings of the attached figures, wherein:

[0030] Figure 1 shows a front view of a fan coil unit according to the prior art, without the front wall;

[0031] Figure 2 shows an exploded perspective view of the fan coil unit of Figure 1 ;

[0032] Figure 3 shows a sectional view along the section plane III - III’ of the fan coil unit of Figure 1 ;

[0033] Figure 4 shows a front view of a fan coil unit according to the invention in a first embodiment, without the front wall;

[0034] Figure 5 shows a side view of the fan coil unit of Figure 4;

[0035] Figure 6 shows a front sectional view along the section plane VI - VI’ of the fan coil unit of Figure 4;

[0036] Figure 7 shows an exploded perspective view of the fan coil unit of Figure 4;

[0037] Figure 8 shows an exploded perspective view of one of the heat exchange units of the fan coil unit of Figure 4;

[0038] Figure 9 shows a perspective view of the finned pack heat exchanger of the thermal unit of Figure 8;

[0039] Figure 10 shows a perspective view of the fan coil unit of Figure 4, with the front wall exploded;

[0040] Figure 11 shows a perspective view of the fan coil unit according to the invention in a second embodiment, with the front wall exploded;

[0041] Figure 12 shows a perspective view of the fan coil unit according to the invention in a third embodiment, with the front wall exploded;

[0042] Figure 13 shows a sectional view along the section plane XIII - XIII’ of the fan coil unit of Figure 4 without the hydraulic conduits and the electronic control means;

[0043] Figure 14 shows a sectional view along the section plane XIV - XIV’ of the fan coil unit of Figure 4 with the air path highlighted;

[0044] Figure 15 shows a sectional view along a plane parallel to the horizontal plane of the fan coil unit according to the invention in a fourth embodiment with the air path highlighted; and

[0045] Figure 16 shows a sectional view along a plane parallel to the horizontal plane of the fan coil unit according to the invention in a fifth embodiment with the air path highlighted.

[0046] Referring to Figures 4 - 10 and 13 - 14, a fan coil unit according to the invention is shown in a first embodiment indicated by the numerical reference 100.

[0047] Looking specifically at Figure 4, the fan coil unit 100 has a housing compartment with a parallelepiped volume, said housing compartment being enclosed by a lower wall 33, an upper wall 30, a first side wall 21 , and a second side wall 2T, each side wall 21 , 2T is arranged in a position opposite to the other with respect to a vertical central y-axis, a front wall 23, preferably insulated using a foam material, which can be removed for installation, hydraulic connection, inspection, or cleaning purposes, and a rear wall 20, wherein both the front wall 23 and the rear wall 20 are arranged in a position opposite to each other with respect to a horizontal x-axis, that is perpendicular to the vertical central y-axis.

[0048] In particular, this housing compartment is made of two “C”-shaped halfshells joined together along their respective ends, said two “C”-shaped half-shells constitute both said first and second side walls 21 , 21 ’, as well as said upper and lower walls 30, 33 of said fan coil unit 100.

[0049] The fan coil unit 100 has an extension in height along said vertical y-axis that is predominantly greater than its width, measured along a horizontal x-axis perpendicular to the vertical y-axis and greater than its depth, measured along a transverse z-axis, which is perpendicular to said vertical y-axis and horizontal x-axis.

[0050] Said fan coil unit 100 is adapted to be wall-mounted, for example, by fixing the rear wall 20 to a wall using suitable fastening means, or it can be mounted on the floor using lower supports, fixed to both the floor and said two “C”-shaped half-shells, in correspondence with said lower wall 33 of the fan coil unit 100.

[0051] The fan coil unit 100 comprises at least one heat exchange unit 1 , 2 arranged inside said housing compartment, which comprises ventilation means 27 (in turn comprising at least one tangential impeller 24).

[0052] By making a section of the fan coil unit 100 according to a transverse plane parallel to the xy-plane, defined by the two horizontal x and central vertical y axes, some characteristic aspects can be appreciated. In particular, referring to Figure 4, the ventilation means 27, arranged downstream of a first of the two side walls 21 , 21 ’ and configured to draw air from a respective side opening 22, 22’, generate an airflow perpendicular to the external faces of the side walls 21 , 21 ’, i.e. horizontal, thus forming an angle equal to 0° with said horizontal x-axis. Said airflow forms at the inlet and outlet of the respective side openings 22, 22’ flow angles bin and bout, between -20° and 20°, preferably 0°, with respect to said horizontal x-axis.

[0053] With reference to Figure 8, each heat exchange unit 1 , 2 comprises a tangential impeller 24, having its rotation axis parallel to said vertical central y-axis, and a finned pack heat exchanger 25, arranged between the ventilation means 27 and a second side wall 21 21 , having a plurality of ducts 35, to allow the circulation of a heat transfer fluid in order to achieve a heat exchange, therefore heating or cooling, between the airflow generated by the tangential impeller 24, which passes through the heat exchanger 25 entering through an intake face 26, specifically the front face 26, facing said ventilation means 27 and exiting through an outlet face 29 facing said second side wall 21 ’, 21 , and said heat transfer fluid.

[0054] Furthermore, said heat exchanger 25 comprises a plurality of fins 25’ parallel to each other along a first axis I perpendicular to said intake face 26, and arranged vertically, i.e. parallel to said central y-axis, to form a plurality of passage channels for the airflow generated by the ventilation means 27, such passage channels being parallel to each other along said first axis I. Specifically, each fin 25’ has a planar surface having two side edges 252’, 253’, which define said intake face 26 facing said ventilation means 27 and said outlet 29 facing said second side wall 2T; 21 , an upper edge 251 ’, and a lower edge 254’. In particular, said side edges 252’, 253’ are provided to be arranged parallel to said vertical central y-axis and the upper edge 25T and lower edge 254’ are oriented along said first axis I, which is arranged on a plane parallel to said horizontal xz-plane.

[0055] This plurality of fins 25’ therefore defines the usable area of said heat exchanger 25, i.e. the area between the two folded sheet metal brackets that enable their mechanical connection to the other elements, where the heat exchange occurs between the airflow generated by the ventilation means 27 and the heat transfer fluid contained within the plurality of ducts 35.

[0056] Said usable area of the heat exchanger 25 is defined by the following parameters:

[0057] • the material of the tubes of the plurality of ducts 35, preferably copper;

[0058] • the external diameter and the thickness of the tubes of the plurality of ducts 35, preferably D9.52 x 0.28 mm;

[0059] • the pitch of the tubes of the plurality of ducts 35, i.e. the distance between one tube and the next belonging to the same rank, preferably 25 mm;

[0060] • the pitch of the ranks, i.e. the distance between two consecutive ranks, preferably 21 .65 mm;

[0061] • the material of the plurality of fins 25’: preferably aluminum with hydrophilic treatment to maximize the formation and collection of condensation; • the shape and thickness of the plurality of fins 25’: preferably corrugated fins of 0.1 mm;

[0062] • the pitch of the plurality of fins 25’, i.e. the distance between two consecutive fins, preferably 2 mm.

[0063] The theoretical heat exchange power obtainable from a finned pack water-air heat exchanger 25 such as the one according to the invention depends on a multitude of parameters including those mentioned above, as well as the airflow rate of the tangential impeller 24, the temperature of the incoming air of the airflow generated by said ventilation means 27, the temperature of the water entering and exiting the heat exchanger 25, and the angle of incidence £ of the heat exchanger 25 with respect to the airflow.

[0064] Said plurality of ducts 35 is preferably organized in one or more ranks, where said plurality of ducts 35, as previously noted, has tubes with a pitch of 25 mm and with lateral bends with an overall dimension of 25 mm for each end of the heat exchanger 25. The tubes therefore affect the overall side dimension of the heat exchanger 25, in fact, due to the pitch of the tubes of said ducts 35, the lateral bends, and a constructionally necessary empty space of 25 mm, an overall additional dimension of 75 mm must be added to a width W of the heat exchanger.

[0065] In the light of this, to ensure a proper heat exchange and a convenient overall dimension of the fan coil unit 100, the ratio between the width W of said intake face 26, measured along a second axis t perpendicular to said first axis I on a plane parallel to said horizontal xz-plane, of said heat exchanger 25, and the width L of said side walls 21 , 2T is expected to be between 1 :2 and 1 :3, preferably 1 :2.6.

[0066] 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 therefore the maximum value that allows, in compliance with the angle of incidence £ (defined by the direction of the airflow moved by the tangential impeller 24 and the front face 26 of the heat exchanger 25), the minimization of the overall depth of the fan coil unit 100. The overall dimension of the fan coil unit 100, along said horizontal x-axis, is therefore kept reduced also thanks to the positioning of the heat exchanger 25, having a front face 26 that enables a very high value of said angle of incidence £, preferably 85° - 90°, more preferably 90°. More generally, the angle of incidence £ may also be between 60° and 90°, in particular between 80° and 90°.

[0067] In other words, the direction of the airflow f forms, with said first axis I along which said fins 25’ are oriented, a first angle a between 0° and 30°, preferably between 0° and 10°, more preferably between 0° and 5°. In the first embodiment, which can be observed in Figure 14, said first axis I of said fins 25’ is parallel to both said horizontal x-axis and said flow direction f exiting from said tangential impeller 24.

[0068] A further characteristic angle, specifically a second angle (3, can be observed in Figures 15 and 16, wherein a fourth and a fifth embodiment of the fan coil unit 100 according to the invention are respectively illustrated.

[0069] Said second angle (3, defined by said first axis I of said plurality of fins 25’ of said heat exchanger 25 and said horizontal x-axis, may be between 0° and 30° and substantially represents a rotated or inclined arrangement of the heat exchanger 25 with respect to the overall dimensions of the fan coil unit 100.

[0070] This second angle [3 can be geometrically correlated with said minimum angle of incidence E, which varying from 60° to 90° determines that said second angle [3 may vary from 0° to 30°, geometrically s = 90° corresponds to [3 = 0° (in a preferred embodiment), while s = 60° corresponds to (3 = 30°. In this latter case, which can be observed in Figure 15, there may be a need for a flow-deflecting fin downstream of the heat exchanger 25 to redirect the airflow perpendicular to the side walls 21 , 2T. This correlation between said angle of incidence s and said second angle [3 may cease if a flow-deflecting fin is also installed upstream of the heat exchanger 25 which still allows, for example, s = 90° with [3 = 30°.

[0071] In both cases described above, the proportioning values of the construction dimensions of the heat exchanger 25 do not change.

[0072] In particular, in the preferred embodiment said tangential impeller 24 has an external diameter of 80 mm and a length along its rotation axis of 600 mm and is driven by a brushless motor powered by 230 V AC and regulated in voltage with a 0-10 V signal or in pulse width modulation (PWM), while the fan of said tangential impeller 24 has an absorbed power of 25 W and overall delivers a flow rate of about 370 m3 / h.

[0073] In addition, each heat exchange unit 1 , 2 can provide connection profiles necessary to structurally support the heat exchanger 25 and further adapted to define a channelling upstream and downstream of the heat exchanger 25 itself, and a condensation collection tray.

[0074] In order to conveniently occupy space and ensure a proper heat exchange, the fan coil unit 100 according to the invention provides for the tangential impeller 24 to be positioned with its rotation axis parallel to the vertical central y- axis, therefore in a vertical position with respect to the plane parallel to the installation floor of the fan coil unit 100 and therefore in a position substantially parallel to the force of gravity.

[0075] Preferably, to resist the axial pressure determined by the force of gravity, said tangential impeller 24 can provide thrust bearings.

[0076] Each heat exchanger 25 has a plurality of fins arranged vertically, in other words parallel to the vertical central y-axis.

[0077] In particular, each heat exchanger 25 has a narrow overall size, depthwise along said transverse z-axis, and a tall size, height-wise along said vertical central y-axis, such as to be conveniently positioned downstream of the tangential impeller 24, which is also arranged vertically, while keeping a reduced overall depth of the fan coil unit 100.

[0078] With reference to Figure 9, the finned pack of the heat exchanger 25 provides characteristic dimensions for the specific installation of the wall-mounted fan coil unit 100 having a vertical volume. The height H of the heat exchanger 25 is slightly less than the height h of the intake openings 22, 22’ of the side walls 21 , 2T of the fan coil unit 100 in order to fully exploit its airflow rate. For example, in the preferred embodiment, said height h of said intake openings 22, 22’ corresponds to 580 mm, over such intake openings 22, 22’ a respective grille, 600 mm high, being fitted by interlocking, and the height of said side walls 21 , 2T corresponds to 600 mm (i.e. , the overall vertical dimension along said total vertical y-axis of the fan coil unit 100 itself). In general, the ratio between said two heights h, H is expected to be between 3:5 and 5:4, preferably 1 :1.

[0079] With reference to the width L of said side walls 21 , 22, between 110 mm - 140 mm and preferably 135 mm, the width W of the intake face 26 of the heat exchanger 25 has been designed such that the ratio between these two widths W, L is between 1 :2 and 1 :3, in order to allow a correct passage of the airflow exiting the heat exchanger 25 towards the outside, through the side walls 21 , 21 ’ themselves.

[0080] The width W of said front face 26 of said heat exchanger 25 is preferably identical to the width w of the outlet openings 22, 22’ of the side walls 21 , 2T of the fan coil unit 100, wherein said width w of said outlet openings 22, 22’ preferably corresponds to 46 mm, over such intake openings a respective grille, 60 mm high, being fixed by interlocking, and wherein the width W of said heat exchanger preferably corresponds to 60 mm (i.e. , the overall dimension in width of the fan coil unit 100 itself), so as to fully exploit its airflow rate. In general, the ratio between said two widths w, W is expected to be between 3:5 and 5:4, preferably 1 :1.

[0081] In a first and second embodiment, corresponding respectively to Figure 4 and Figure 11 , the ratio between the width W of said front face 26 and the height of the heat exchanger 25 is between 1 :5 and 1 :20, preferably 1 :10; while in a third embodiment, corresponding to Figure 12, the ratio between the width W of said front face 26 and the height of the heat exchanger 25 is between 1 :10 and 1 :40, preferably 1 :20.

[0082] With reference to said angle of incidence E, if said angle changes, and the finned pack battery of the heat exchanger 25 consequently tilts, greater widths W are theoretically possible, but the perpendicularity of the airflow generated by the tangential impeller 24 with respect to said front face 26 of the heat exchanger 25 is lost, i.e. a critical parameter of the heat exchange efficiency of this type of heat exchanger 25.

[0083] Imagining deflecting, in particular curving, the airflow exiting the tangential impeller 24 at the inlet of the finned pack of the heat exchanger 25 in order to potentially increase the width W of the heat exchanger 25 itself, a corresponding subsequent counter-curvature at the outlet would be necessary, which is required to align the exiting airflow with the side walls 21 , 2T of the fan coil unit 100.

[0084] This technical solution, however, would imply pressure losses that would negatively affect the efficiency of the heat exchanger 25 and the noisiness of the fan coil unit 100 itself. Finally, the thickness T, measured along the horizontal x-axis, is the thickness of the finned pack of the heat exchanger 25 and depends directly on the number of ranks of the exchanger itself, the optimal value of which is between 1 and 4 ranks, preferably 2 - 3.

[0085] Inside the housing compartment of the fan coil unit 100, in a position next to each heat exchange unit 1 , 2, at least one first side compartment can be arranged along said horizontal x-axis, between said at least one heat exchange unit 1 , 2 and said second side wall 2T, 21 , configured to house the hydraulic circuitry and / or electrical devices, for example inlet tubes 17a and outlet tubes 17b, hydraulic connection valves 18, a condensate drain, an internal wiring, an electrical power board, and a user interface unit 19.

[0086] By diving deeper into the aeraulic analysis, it is possible to observe, with reference to Figure 14, that the path of the air inside the heat exchange unit 1 , 2 is significantly more linear and less subject to efficiency losses than the prior art, and that the incidence between air and exchanger, represented by the angle E, is set at significantly higher values (between 60° and 90°, preferably between 85° and 90°, but ideally 90°, i.e. the condition of maximum theoretical exchange for the same airflow rate and the same exchanger dimensions) compared to heat exchangers installed in fan coil units known in the state of the art, wherein incidence angles y are up to 10°, for example with reference to Figure 3.

[0087] With reference to Figures 10 and 12, three different embodiments of the fan coil unit 100 according to the invention are shown, which imply different modes of circulation of the airflow, depending on the specific orientation of the heat exchange units 1 , 2.

[0088] In the first and second embodiment shown in Figure 4 and Figure 11 , there are two heat exchange units 1 , 2, each comprising a respective tangential impeller 24; but, in other embodiments, such as the third one shown in Figure 12, it can be provided that there is just one heat exchange unit 1 , 2 comprising two tangential impellers 24 arranged along an axis parallel to said vertical y-axis. When a second heat exchange unit 2; 1 is provided, it is arranged in said housing compartment adjacent to said first heat exchange unit 1 ; 2 along the direction of said 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 impeller of the first heat exchange unit 1 , 2.

[0089] In the first embodiment of Figure 10, there are two heat exchange units 1 ; 2 arranged adjacent to each other and arranged along a direction parallel to said central y-axis, each heat exchange unit 1 ; 2 generates an airflow along a respective horizontal direction f parallel to said horizontal or longitudinal x-axis, but with opposite flow directions, the two heat exchange units 1 ; 2 being oriented opposite to each other. In this first embodiment, therefore, the two heat exchange units 1 , 2 are oriented in a specular and opposite manner. In the second embodiment shown in Figure 11 there are still two heat exchange units 1 , 2 oriented on the same side.

[0090] In the second embodiment, the ventilation means 27 of the first heat exchange unit 1 ; 2 are arranged downstream of the side opening 22; 22’ on the first side wall 21 ; 2T, while the said at least one heat exchanger 25 is positioned between the respective ventilation means 27 and said second side wall 2T; 21. The ventilation means 27 of the second heat exchange unit 2; 1 are then arranged downstream of the side opening 22’; 22 on said second side wall 2T; 21 , while the said respective at least one heat exchanger 25 is arranged between the respective ventilation means 27 and said first side wall 21 , 2T; therefore, such ventilation means 27, specifically the tangential impellers, will generate an airflow along a respective horizontal direction f parallel to said longitudinal x-axis with concordant flow directions.

[0091] This embodiment has numerous advantages, in particular:

[0092] - a reduction in the risk of loops between the outlet opening 22 of one heat exchange unit 1 and the inlet of the other heat exchange unit 2;

[0093] - a simplification of the hydraulic system layout controlling the two exchangers 25 of each heat exchange unit 1 , 2 (i.e. the creation of a more linear path for the heat transfer fluid used, which results in lower pressure losses); and

[0094] - a clearer separation between the hydraulic control system side (on the side of the heat exchangers 25 of each heat exchange unit 1 , 2) and the electrical control system side (on the side of controls, power PCB, and electric motor power supply), resulting in an obvious increase in product safety.

[0095] Furthermore, in this embodiment, the user’s perception of the heating / cooling effect of the environment is enhanced, since the air exiting from the openings 22’ is hot / cold along its entire height h, measured along an axis parallel to said y-axis.

[0096] Finally, in relation to Figure 12, a third embodiment of the 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 the central vertical y-axis with their respective rotation axes aligned, wherein the overall height of the two tangential impellers 24 along an axis parallel to the vertical y-axis preferably is equivalent to the height H of said at least one heat exchanger 25. This embodiment allows for a significant simplification of the hydraulic design of the fan coil unit 100, since it has only one heat exchanger 25. In a possible construction scheme for the realization of said third embodiment, said overall height of the two tangential impellers 24 may be 1200 mm (two aligned impellers having a length of 600 mm each), while said height H of said at least one heat exchanger 25 may correspond to 1250 mm. Said height H is slightly higher than the overall height of the two tangential impellers 24 because of construction needs, as it is necessary to consider the space occupied by the abutments of said tangential impellers 24. Therefore, the ratio between the overall height of said two tangential impellers 24 along an axis parallel to the vertical y-axis and the height H of said at least one heat exchanger 25 can be between 1 :1 and 1 :1.1 , preferably 1 :1.05.

[0097] Therefore, such ventilation means 27, specifically the tangential impellers, will generate an airflow along a respective horizontal direction f parallel to said longitudinal x-axis with concordant flow directions that pass through the same heat exchanger 25.

[0098] All three embodiments of the fan coil unit 100 according to the invention cited above have an overall dimension between 450 and 550 mm in width and a size between 1600 and 2000 mm in height, preferably 500 and 1800 mm respectively.

[0099] Advantageously, the fan coil unit 100 according to the invention, due to its predominantly vertical dimension along the central vertical y-axis and a reduced thickness, is suitable for use in living applications, having thermal powers in both cooling and heating that are adequate for such applications, in particular having better thermal performances for the same width compared to prior art fan coil units and conveniently occupying the space where they are installed.

[0100] Furthermore, the fan coil unit 1 according to the invention allows the airflow generated by the ventilation means 27 to be directed along a less tortuous path than in the prior art, uniformly reaching all portions of the heat exchange unit 25, consequently involving every part of the heat exchanger 25 in the heat exchange phenomenon. In fact, the arrangement and size of the components of the fan coil unit 1 according to the invention (such as the vertical orientation of the tangential impeller 24 and the size of the finned pack of the heat exchanger 25) excludes the presence of “dead zones”, i.e. the presence of an airflow recirculation or a poor flow, which therefore participate little in the heat exchange with the heat exchanger 25.

[0101] Another advantage of the fan coil unit 1 according to the invention consists in being able to ensure the correct discharge of the condensate from the heat exchange unit 25 due to the vertical orientation, parallel to the vertical central y-axis, of the plurality of fins 25’ and at the same time avoid the accumulation of dust on the plurality of fins 25’ themselves.

[0102] The vertical arrangement of the components that constitute the fan coil unit 100 still advantageously allows the use of a tangential impeller 24 of greater length than the tangential impellers used in prior art fan coil units (which are arranged with the rotation axis in a horizontal position), consequently allowing for a greater airflow rate moved by the tangential impeller 24 itself. This therefore determines an unprecedented air circulation compared to traditional fan coil units, as in this case, the preferential direction of the flow and the force of gravity (resulting in phenomena of air stratification), are no longer aligned, but perpendicular to each other.

[0103] Finally, advantageously, the fan coil unit 100 according to the invention allows the achievement of heat exchange performances equivalent to those of prior art fan coil units, despite a significantly smaller theoretical impact area (the theoretical surface of the front face 26 through which the heat transfer fluid passes through the heat exchange unit 25).

[0104] In the foregoing, the preferred embodiments have been described and some variants of the present invention have been suggested, but it is to be understood that those skilled in the art may make modifications and changes without thereby departing from the relevant scope of protection, as defined by the attached claims.

Claims

CLAIMS1 . Fan coil unit (100) having a housing compartment with a parallelepiped volume, said housing 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 , 2T) being opposite to the other with respect to a vertical central axis (y), with at least one side opening (22, 22’) being present on each side wall (21 , 21 ’), said front (23) and rear (20) walls being opposite to each other with respect to a horizontal axis (x), perpendicular to said vertical central axis (y), said two side walls (21 , 21 ’) being opposite to each other with respect to a transverse axis (z), said transverse axis (z) being perpendicular to said central vertical axis (y) and to said horizontal axis (x), said fan coil unit (100) comprising at least one heat exchange unit (1 , 2) arranged in said housing compartment, said at least one heat exchange unit (1 , 2) comprising ventilation means (27) comprising at least one tangential impeller (24) having its axis parallel to said vertical central axis (y), said ventilation means (27) being arranged downstream of a first one of the two side walls (21 ; 2T) and being configured, during use, to draw air from the respective at least one side opening (22; 22’) and generate at the outlet an airflow along a first rectilinear direction (f) lying on planes parallel to the horizontal plane (xz) towards the side opening (22’; 22) on the second side wall (21 ’; 21 ), and at least one finned pack heat exchanger (25) arranged between said ventilation means (27) and said second side wall (21 ’; 21 ) for heating or cooling said airflow, said fan coil unit (100) being characterized in that said at least one heat exchanger (25) comprises a plurality of fins (25’) parallel to each other with respect to said vertical central axis (y), each fin (25’) having a planar surface having two side edges (252’, 253’), a top edge (25T) and a bottom edge (254’), wherein the side edges (252’, 253’) are parallel to said central vertical axis (y) and the top edge (251 ’) and the bottom edge (254’) are oriented along a first axis (I) arranged on a plane parallel to said horizontal plane (xz), so as to form a plurality of flow ducts for said airflow between an intake face (26), formed by the first side edges (252’; 253’) of said plurality of fins (25’) and facing said ventilation means (27), and an outlet face(29), formed by the second side edges (252’; 253’) of said plurality of fins (25’) and facing said second side wall (21 ’; 21 ), in that the ratio between the width (W) of said intake face (26) of said at least one heat exchanger (25), measured along a second axis (t) perpendicular to said first axis (I) on a plane parallel to said horizontal plane (xz), and the width (L) of each of said side walls (21 , 21 ’), measured along said transverse axis (z), of said fan coil unit (100) is between 1 :2 and 1 :3, preferably about 1 :2.6, and in that said at least one finned pack heat exchanger (25) and said ventilation means (27) of said at least one heat exchange unit (1 , 2) are arranged in said housing compartment such that, during use, when said fan-coil unit (100) is arranged with its vertical central axis (y) parallel to the direction of gravity, the angle of incidence (E), measured on said horizontal plane (xz), between said first rectilinear direction (f) of the airflow exiting from said at least one tangential impeller (24) with respect to the second axis (t) laying on said intake face (26) of said at least one heat exchanger (25) is between 60° and 90°, preferably between 80° and 90°, more preferably between 85° and 90°, in particular is 90°.

2. Fan coil unit (100) having a housing compartment with a parallelepiped volume, said housing 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 the other with respect to a vertical central axis (y), with at least one side opening (22, 22’) being present on each side wall (21 , 21’), said front (23) and rear (20) walls being opposite to each other with respect to a horizontal axis (x), perpendicular to said vertical central axis (y), said two side walls (21 , 21 ’) being opposite to each other with respect to a transverse axis (z), said transverse axis (z) being perpendicular to said central vertical axis (y) and to said horizontal axis (x), said fan coil unit (100) comprising at least one heat exchange unit (1 , 2) arranged in said housing compartment, said at least one heat exchange unit (1 , 2) comprising ventilation means (27) comprising at least one tangential impeller (24) having its axis parallel to said vertical central axis (y), said ventilation means (27) being arranged downstream of a first one of the two side walls (21 ; 2T) and being configured, during use, to draw air from the respective at least one side opening (22;22’) and generate at the outlet an airflow along a first rectilinear direction (f) lying on planes parallel to the horizontal plane (xz) towards the side opening (22’; 22) on the second side wall (21 ’; 21 ), and at least one finned pack heat exchanger (25) arranged between said ventilation means (27) and said second side wall (21 ’; 21 ) for heating or cooling said airflow, said fan coil unit (100) being characterized in that said at least one heat exchanger (25) comprises a plurality of fins (25’) parallel to each other with respect to said vertical central axis (y), each fin (25’) having a planar surface having two side edges (252’, 253’), a top edge (25T) and a bottom edge (254’), wherein the side edges (252’, 253’) are parallel to said central vertical axis (y) and the top edge (251 ’) and the bottom edge (254’) are oriented along a first axis (I) arranged on a plane parallel to said horizontal plane (xz), so as to form a plurality of flow ducts for said airflow between an intake face (26), formed by the first side edges (252’; 253’) of said plurality of fins (25’) and facing said ventilation means (27), and an outlet face (29), formed by the second side edges (252’; 253’) of said plurality of fins (25’) and facing said second side wall (21 ’; 21 ), in that the ratio between the width (W) of said intake face (26) of said at least one heat exchanger (25), measured along a second axis (t) perpendicular to said first axis (I) on a plane parallel to said horizontal plane (xz), and the width (L) of each of said side walls (21 , 21 ’), measured along said transverse axis (z), of said fan coil unit (100) is between 1 :2 and 1 :3, preferably about 1 :2.6, and in that said at least one finned pack heat exchanger (25) and said ventilation means (27) of said at least one heat exchange unit (1 , 2) are arranged in said housing compartment such that, during use, when said fan-coil unit (100) is arranged with its vertical central axis (y) parallel to the direction of gravity, said first axis (I) of said plurality of fins (25’) is parallel to said first rectilinear direction (f) of the airflow exiting from said at least one tangential impeller (24) or forms with said first rectilinear direction (f) a first angle (a) between 0° and 30°, preferably between 0° and 10°, more preferably between 0° and 5°, measured on said horizontal plane (xz).

3. Fan coil unit (100) according to claim 1 or 2, wherein said at least one heat exchanger (25) is arranged in said housing compartment so that said first axis (I) of said plurality of fins (25’) is parallel to said horizontal axis (x) or is inclined withrespect to said horizontal axis (x) of a second angle ([3) between 0° and 30°.

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

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

6. Fan coil unit (100) according to any one of the preceding claims, wherein said at least one heat exchanger (25) provides a plurality of ducts (35), adapted to circulate a heat transfer fluid, arranged in a number of ranks between one and four, preferably two or three.

7. Fan coil unit (100) according to any one of the preceding claims, wherein said fan coil unit (100) further comprises at least one first side compartment (T, 2’) arranged between said at least one heat exchange unit (1 , 2) and said second side wall (21’, 21 ), along said horizontal axis (x), said at least one first side compartment (T, 2’) being adapted to house a plurality of hydraulic conduits and electronic control means.

8. Fan coil unit (100) according to any one of the preceding claims, wherein said ventilation means (27) of a heat exchange unit (1 ) comprise two tangential impellers (24) arranged adjacent to each other along a direction parallel to said vertical central axis (y) with their respective axes aligned, wherein the ratio between the overall height of said two tangential impellers (24) along an axis parallel to the vertical central axis (y) and the height (H) of said at least one heat exchanger (25) is between 1 : 1 and 1 :1.1 , preferably 1 : 1 .05.

9. Fan coil unit (100) according to the preceding claim, wherein the ratio between said width (W) and said height (H) of said at least one heat exchanger (25) is between 1 :10 and 1 :40, preferably 1 :20.

10. Fan coil unit (100) according to any one of claims 1 - 7, wherein said fan coil unit comprises two heat exchange units (2; 1 ), wherein a second heat exchange unit (2; 1 ) is arranged in said housingcompartment adjacent to a first heat exchange unit (1 ; 2) along the direction of said vertical central axis (y), and wherein the axis of said tangential impeller (24) of said second heat exchange unit (2; 1 ) is arranged aligned with the axis of the tangential impeller (24) of said first heat exchange unit (1 ; 2).11 . Fan coil unit (100) according to any one of claims 1 - 7, wherein said fan coil unit (100) comprises two heat exchange units (1 , 2), wherein the ventilation means (27) of a first heat exchange unit (1 ; 2) are arranged downstream of the side opening (22; 22’) on said first side wall (21 ; 21 ’), and said at least one heat exchanger (25) is arranged between the respective ventilation means (27) and said second side wall (21 ’; 21 ), wherein the ventilation means (27) of a second heat exchange unit (2; 1 ) are arranged downstream of the side opening (22’; 22) on said second side wall (21’; 21 ) and the respective at least one heat exchanger (25) is arranged between the respective ventilation means (27) and said first side wall (21 , 21 ’).

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

13. Fan coil unit (100) according to any one of the preceding claims, wherein said ventilation means (27) of said at least one heat exchange unit (1 ; 2) further comprise airflow deflection means (240) for deflecting said airflow, coming from said at least one tangential impeller (24), along said first rectilinear direction (f).

14. Fan coil unit (100) according to the preceding claim, wherein said airflow deflection means (240) comprise two deflectors (241 , 242), each deflector (241 ; 242) having a substantially “L-shaped” profile with the respective arms (241 a, 241 b; 242a, 242b) arranged parallel to the arms (242a, 242b; 241 a, 241 b) of the other deflector (242; 241 ) such as to form a substantially “L-shaped” passage channel, wherein the respective at least one tangential impeller (24) is arranged between said two deflectors (241 , 242) at the concavity of said substantially “L- shaped” passage channel.

15. Fan coil unit (100) according to any one of the preceding claims, wherein said intake face (26) of said at least one heat exchanger (25) is arranged parallel to said transverse axis (z).

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

17. Fan coil unit (100) according to any one of the preceding claims, wherein the ventilation means (27) of said at least one heat exchange unit (1 , 2) are configured such that, during use, the inlet direction (g) and / or outlet direction (h) of the airflow through said at least one side opening (22; 22’) of each of said side walls (21 , 21 ’) forms an angle (5) between -20° and 20°, preferably 0°, with said horizontal axis (x), measured in a plane (xy) defined by said vertical central axis (y) and said horizontal axis (x).

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

Images