WO2002042691A1

WO2002042691A1 - Supply air terminal device

Info

Publication number: WO2002042691A1
Application number: PCT/FI2001/001006
Authority: WO
Inventors: Kim HAGSTRÖM
Original assignee: Halton Oy
Priority date: 2000-11-24
Filing date: 2001-11-20
Publication date: 2002-05-30
Also published as: SE528140C2; DE10196956T1; SE0301284L; NL1019355C2; GB2384302B; BE1014489A5; GB0310965D0; FR2817331A1; FI20002591A0; FR2817331B1; FI20002591A; AU2002223711A1; SE0301284D0; GB2384302A; FI113798B

Abstract

The invention concerns a supply air terminal device (10). The supply air terminal device includes a supply air chamber (11) and therein several nozzles (12a, 12a2, ...; 12b1, 12b2, ...) or a nozzle gap, through which a supply airflow (L1) is conducted into a mixing chamber (B1) inside the device. The supply air terminal device includes a flow aperture (T1) on one side of the device, through which a circulated airflow (L2) is conducted from the room, whereby the said circulated airflow is conducted to join the supply airflow (L1) induced by the supply airflow (L1). The flows combine in the mixing chamber (B1) inside the device, and the combined airflow (L1 + L2) of the supply airflow (L1) and the circulated airflow (L2) is made to flow further out of the device.

Description

Supply air terminal device

The invention concerns a supply air terminal device.

Induction of room air into the supply air before the room space has been applied even earlier in various applications. Traditionally, the air is circulated by an air- conditioning unit. The said circulation of air tlirough an air-conditioning unit causes a loss of energy, adds to the migration of impurities from one room to another and adds to their accumulation in the duct system.

This application presents a supply air terminal device of a new type, wherein the . circulated air is mixed in an internal mixing chamber with the fresh supply air without heating or cooling the circulated air.

Internal circulation of air in the device is a way of avoiding expensive recirculated air solutions through the supply air terminal unit and at the same time of preventing impurities from spreading from one room space to another.

The device is characterised in that

The primary air is blown into the device tlirough nozzles.

The secondary room air is taken into the device by way of controlled flow routes.

The flow of secondary air is brought about by using the induction effect of the primary air.

The primary air and the secondary air are mixed within the device before the air discharges from the device into the room space.

The ratio of secondary air can be controlled by using an internal control part in the supply air terminal device either manually or using an electric - motor. Motor control is controlled with the aid of a separate control device or control algorithm. The device may also function as a condensing device, whereby it is equipped with a condensate removal fitting.

When the device includes an induction ratio control device, the device can be used for controlling the room air velocity and thus for controlling comfort conditions irrespective ofthe flow of supply air.

The supply air terminal device is characterised in that its supply air jet behaves almost like an isothermal jet, whereby in a cooling situation it is possible to prevent the supply air jet from dropping directly into the occupied zone and thus significantly to avoid the risk of draught, and in a heating situation it is possible to avoid un unfavourable temperature stratification in the ceiling. The behaviour of the inducing supply air terminal device also guarantees an efficient mixing of room air and a high efficiency of ventilation. Owing to its characteristics, the inducing supply air terminal device is especially suitable for such service situations, where the primary air used as supply air is significantly cooler or warmer than the room air. The supply air temperature may vary significantly in different service situations of the installation, or the air volume of supply air, that is, of the primary airflow, may change during serv- ice. The supply air terminal device according to the invention, which strongly induces the circulated air, may be used e.g. in the following cases: in cases where unheated supply air is used as the primary air, in air heating systems, in installations, where cold storages are used to level out electric energy consumption peaks round the clock, ,

- in variable air volume systems to guarantee that the shape of the air jet remains unchanged irrespective ofthe primary air volume, in standard air volume systems to control comfort conditions by controlling the induction ratio.

According to the invention, a new type of supply air terminal device is de- signed, wherein the equipment includes a supply air chamber, from which the supply air is made to flow through a nozzle or preferably through several nozzles at a high velocity into an internal mixing chamber of the device, whereby the said flow of supply air will induce a circulated airflow from the room to flow to join the flow of supply air in the mixing chamber. The circulated airflow is thus drawn with the aid of the supply airflow into the mixing chamber, and the combined airflow will leave the device. The combined airflow moves freely into the room space through a flow gap extending over the length of the device or through a round or annular flow aperture without any perforated surface or such that would slow down the airflow. The device is thus efficient and it can be used to circulate great air volumes of room air. The circulated airflow is neither heated nor cooled by a heat exchanger, but the circulated airflow arrives from the room space to join the primary airflow directly. In the device solution according to the invention, the air is conducted from the room space induced by the supply airflow L_x to join this, and the combined airflow X_λ + L₂ is conducted from the mixing chamber through an elongated flow gap or aperture into the room space. Under these circumstances, there are no perforated plate structures or such slowing down the flow velocity ofthe airflow on the discharge side of the mixing chamber. However, it is possible to use guiding parts guiding the flow or changing the shape ofthe flow jet.

In this application, the airflow conducted from the supply air chamber through a nozzle or preferably through nozzles is called the primary airflow, that is, the supply airflow, while the airflow induced by the primary airflow and conducted from the room space is called the circulated airflow, that is, the secondary airflow, in this application.

In a supply air terminal device, wherein the supply air is supplied through a supply air chamber and wherein the room air is circulated with the aid of a device, control of the induction ratio has also become necessary in certain applications. This means that it is possible to control the ratio Q₂/Qι between the flow volumes Q₂ and Q] ofthe circulated airflow L₂ and the supply airflow L,.

For implementation of the above-mentioned control, the present application proposes use of a separate induction ratio control device. In one advantageous embodiment, the induction ratio control device is formed by a structure, where the flow of circulated air from the room space is controlled by controlling the position of apertures in a movable aperture plate, which is located in connec- tion with a fixed aperture plate, in relation to the apertures in an aperture plate located in a fixed position. Under these circumstances, the flow of circulated air can be throttled into the circulated airflow device on the supply side, and in this manner the induction ratio between flows L₂ and L_x is controlled. Control may also take place by controlling the combined airflow L_t + L₂ of supply airflow and circulated airflow. The more the airflow Li + L₂ is throttled, the lower the induction ratio will be, that is, the air volume of the circulated airflow L₂ becomes smaller in relation to the primary airflow L_x. According to the invention, the control device may also be located on the supply side of side chamber B_l5 whereby e.g. by a plate movable in a linear direction the flow path of the circulated airflow L₂ is controlled, and at the same time the concerned flow L₂ of circulated air is controlled and the induction distance is affected. The control plate may be located in the direction of the other duct wall of mixing chamber Bi and it may be movable in its direction, e.g. by remote control by a motor or manually.

Besides the above-mentioned ways of controlling the induction ratio, such a control device may also be used, which is formed by a set of nozzles formed by nozzles in two separate rows opening from the supply chamber for fresh air, whereby the nozzles in the first row are formed with a larger cross- sectional flow area than the nozzles in the second row. In connection with the said nozzles a control device is located, which is formed by an aperture plate used for controlling the flow between the nozzle rows ofthe said nozzles.

The supply air terminal device according to the invention is characterised by the features presented in the claims.

In the following, the invention will be described by referring to some advantageous embodiments of the invention shown in the figures of the appended drawings, but the intention is not to limit the invention to these embodiments only.

Figure 1 A is an axonometric view of a supply air terminal device according to the invention, which is open at the bottom and closed at the top and on the sides.

Figure IB is a cross-sectional view along line I-I of Figure 1A.

Figure IC shows a supply air terminal device equipped with an induction ratio control device.

Figure ID is a cross-sectional view along line II— II of Figure IC.

Figure IE is an axonometric separate view of the structure of the induction ratio control device.

Figure 2 shows an embodiment ofthe induction ratio control device according to the invention, wherein the control device is located in side chamber _x.

Figure 3 A shows a third advantageous embodiment of an induction ratio con- trol device, wherein the control device is fitted to be located on one side wall of side chamber B_l5 that is, in the air guiding part, to close and open the flow path into the side chamber B .

Figure 3B is an axonometric view of a moving mechanism for the control damper of a control device according to Figure 3 A.

Figure 3C shows an embodiment of the invention, wherein there is a separate turning control damper, which can be used for controlling the induction ratio between the flows L₂ and I^. The damper is fitted to turn in a pivot point, which is located on a side surface ofthe supply air chamber.

Figure 3D shows a device according to the invention, wherein nozzles opening from the supply air chamber direct the supply airflow on to the ceiling of the room space, whereby due to the coanda effect the flow will cling to the ceiling and the supply air flow will draw the circulated airflow along with it centrally from the room.

Figure 4 A shows an embodiment ofthe induction ratio control device, wherein the device includes two nozzle rows 12a_l512a₂ ... and 12b_l512b₂ ... for the primary air flow L whereby from between the nozzles ofthe nozzle rows the flow ratio is controlled with the aid of a control plate located in the supply chamber for the primary airflow, which control plate includes flow apertures fi,f₂ ... for the nozzles of one nozzle row 12a_l512a₂ ... and flow apertures tj,t₂ ... for the nozzles 12b_!,12b₂ ... ofthe other nozzle row.

Figure 4B shows the area X_x of Figure 4A.

Figure 5 shows an embodiment of the induction ratio control device, wherein the supply chamber for the primary airflow on both sides of vertical central axis Y_x in the supply air chamber includes two nozzle rows, whereby the nozzles in the nozzle rows have different cross-sectional flow areas, and the airflow to the nozzles is controlled by an internal tube having flow apertures by rotating the tube, whereby depending on the angle of rotation of the tube, the flow is controlled through nozzles ofthe different nozzle rows, and in this manner the flow velocity of flow in the mixing chamber is controlled and thus the induction ratio between flows ϊ__x and L₂ is controlled.

Figure 6A shows an embodiment of the invention, wherein the circulated airflow is conducted from above into the mixing chamber to join the supply airflow L_l5 and the combined airflow is made to flow through the lower flow gap ofthe mixing chamber into the room space.

Figure 6B shows the device solution of Figure 6A equipped with the induction ratio control device.

Figure 7 A shows an embodiment, wherein the circulated airflow is conducted from the side ofthe device into the mixing chamber to join the supply airflow.

Figure 7B shows the device solution of Figure 7A equipped with the induction ratio control device.

Figure 8 A shows an embodiment of the invention, wherein the supply airflow is directed from the nozzles directly downwards from the supply air chamber towards the central flow aperture T₂, while the circulated airflow is directed from above into the side chamber and further from the side to join the supply airflow, whereby the combined airflow is made to flow downwards in the device.

Figure 8B shows the device solution of Figure 8A equipped with the induction ratio control device. Figure 9A shows a model closed at the top and on the sides, wherein each side chamber B_x is limited by a separating wall and a side wall and wherein the circulated airflow is directed from below to join the supply airflow to the central part of the device into the space between the separating walls, and the combined airflow is conducted further downwards and out ofthe device.

Figure 9B shows the device solution of Figure 9 A equipped with the induction ratio control device.

Figures 10A-10J show how the embodiments of supply air terminal devices presented above are located in the room space. The figures are vertical cross- sections of the room space and they show different throw patterns of the supply air jet ^~L_X + L₂ with different positions and variations ofthe devices.

Some advantageous embodiment of the invention will be described hereinafter. The invention includes a supply air chamber for the supply air, from which the fresh supply air is distributed through nozzles into an internal mixing chamber of the device, into which the circulated airflow is also conducted from the room space induced by the mentioned supply airflow. In the most advantageous embodiment of the invention, the supply air chamber includes several nozzles located side by side and preferably fitted to form one or more nozzle rows. Such an embodiment is also possible within the scope of the invention, wherein the nozzles are replaced by one or more elongated nozzle gaps.

Figure 1 A is an axonometric view of the supply air terminal device 10. Figure 1 A shows a model, which is closed at the top and on the sides and wherein the internal mixing chamber/chambers B_x of the device are limited by side plates 10b and end plates lOd, of which one end wall lOd is cut open in part in Fig- ure 1A to show the internal structures. In addition, from above the mixing chamber/mixing chambers Bjare limited by the bottom wall 111 of the supply air chamber 11. Thus, the structure shown in Figure 1A opens only at the bottom into room space H as shown in the figure. Fresh air is conducted by way of the supply duct into supply chamber 11, from which the air is conducted further through nozzles 12a_l512a₂ ... into side or mixing chambers B_x of the device on both sides of the vertical central axis Yl of the device. The figure shows nozzles 12a_l512a₂ ... ofthe supply air chamber 11, tlirough which the air is conducted into the side chambers B,. This is the most advantageous embodiment of the invention. Within the scope of the invention such an embodiment is also possible, wherein the several nozzles 12aι,12a₂ ... are re- placed by a flow gap. In this application, supply air means that supply air, which is conducted from supply air chamber 11 through the nozzles into mixing chamber B_x and which induces the circulated airflow L₂ from room H into mixing chamber B_x. The supply airflow is also called the primary airflow. The circulated airflow L₂ induced by the supply airflow _x is also called the secon- dary airflow. As is shown in Figure 1A, the supply air terminal device 10 includes in between the air guiding parts 13 limiting side chambers B_! in the central area ofthe device and below supply air chamber 11 a free flow path El for the circulated airflow L₂. For the circulated airflow L₂of the room there is a free flow path Ε_x into side chambers B] from the central part ofthe device. The said air flow L₂, that is, the secondary airflow, is brought about by the primary airflow L_x from nozzles 12a_l512a₂ ... of supply chamber 11. In the side chambers B_x the airflows L_l5L₂ are combined, and the combined airflow _x + L₂ is made to flow to the side guided by the air guiding parts 13 located in the lower part of frame and by the side plates 10b of the supply air terminal device 10. Flow _x + L₂ arrives through a gap or aperture T₂ in the room space in such a way that its velocity will not slow down essentially. The supply air terminal device includes no heat exchanger for heating or cooling the circulated airflow L₂.

The device shown in the figure may include such an arrangement as the induction ratio control device 15, wherein an assembly 130, which includes air guiding parts 13 and a connecting structure between them, including flow apertures lβbj or such for the circulated airflow L₃, can be moved as one structural component towards the supply air chamber 11 and away from it as shown by arrow M_x. By this move the induction ratio Q₂/Qι between the flows L₂ and L_t is controlled. In the figure, reference number 130 indicates the movable assembly.

Figure IB is a cross-sectional view along line I-I of Figure 1A of a first advantageous embodiment ofthe invention. Figure IB is suitable also as a cross- sectional view for such device solutions, wherein the supply air terminal device has a square cross section or a circular cross section. Supply air terminal device 10 includes a supply air chamber 11 for the fresh supply air, from which the air is conducted through nozzles 12a₁,12a₂ ... into the side or mixing chamber B_x of the device and further into room space H. In the embodiment shown in the figure, the supply air terminal device is a structure closed on the sides and at the top. With the aid of supply airflow L_l5 circulated air L₂ is induced from below the device into side chamber B_x. The combined airflow Lj + L₂ is made to flow away from the side chamber and to the side from the device, preferably at the level of the roof of the building, such as at ceiling level. Hereby the device will be located in such a way in relation to the ceiling level, that the bottom parts of the device frame are located at ceiling level, to which the combined airflow I-_! + L₂ is directed. Supply air terminal device 10 includes a free flow path E_x for the circulated airflow L₂ into side air chamber Bj from below the supply air chamber 11 and centrally in such a way that the circulated airflow L₂ can be directed to both sides of the central axis Y_x of the device. The supply air terminal device 10 includes in the supply air chamber a flow gap or, according to the most advantageous embodiment, several nozzles 12a_l512a₂ ... side by side, from which the conducted fresh supply air will induce the circulated airflow L₂ to flow centrally in the device through the free flow path B_x below supply air chamber 11 into side chamber B^ In side cham- ber B_l5 flows L_x + L₂ are combined, and the combined airflow I-_! + L₂ is conducted to the side from the device in the direction ofthe ceiling level.

As is shown in the figure, supply air chamber 11 closes device 10 at the top. The side plates 10b and end plates lOd of the device frame R close the device on the sides. The device has a flow path O_x for the combined airflow L_x + L₂ between air guiding part 13 and side wall 10b away from side chamber B_x and further in the direction ofthe ceiling level into the room space. The side plates of the device frame R and the air guiding parts 13 limit chambers B_x at the side ofthe device. Air guiding part 13 and side plates 10b are shaped in such a way that the combined airflow L_x + L₂ will flow in a horizontal direction to the side and preferably in the direction ofthe ceiling level and along this.

There is preferably an aperture plate 16bl in between the air guiding parts 13 of the device, whereby the circulated airflow L₂ conducted through the aperture plate is guided further into side chambers B_x. As was described above, the combined air flow _x + L₂ is guided away from the device, preferably with the aid of air guiding parts 13 guided by these in a horizontal direction to the side. The device is symmetrical in relation to vertical central axis Y^

In this context we refer to Figures 10A-10J, which show various location positions of supply air terminal devices in the room space. Thus, even though an advantageous ceiling embodiment was presented above, the device may also be used in a wall position or floor position or freely mounted. The same applies to the other device embodiments presented in this application.

Figures IC, ID and IE show an embodiment otherwise similar to the one shown in Figures 1 A and IB, except that the device is equipped with a control device 15 for the induction ratio between flows L₂ and L^ In order to control the induction ratio Q₂/Qι between flows L_x and L₂, the embodiment shown in Figure IB includes in between the air guiding parts 13 an induction ratio control device 15, which is used to control the flow volume of circulated airflow L₂. Hereby the induction ratio Q₂/Qι is controlled, wherein Q₂ is the flow volume of the circulated airflow L₂, while Q_x is the flow volume of the supply airflow, that is, the primary airflow L_x. With devices according to the invention, the maximum induction ratio Q₂/Qι is typically in a range of 2-6.

The induction ratio control device 15 ofthe embodiment shown in Figures IC,

ID and IE is formed by an aperture plate structure. The structure includes a second aperture plate lβaa movable in relation to a first aperture plate lόaj located in a fixed position (arrow Si indicates the linear motion), whereby the apertures a_l5a₂..., b_l5b₂... in aperture plates 16aι,16a₂ can be placed in covering positions in relation to each other, whereby the total cross-sectional flow area through the aperture surface structure can be controlled and the circulated airflow L₂ through the aperture surface can thus be controlled. In certain service conditions the flow L₂ can be closed off entirely.

Figure 2 shows an embodiment otherwise similar to the one shown in Figure

IC, except that here each side chamber B_x includes a control device 15 for controlling the induction ratio between flows L_x and L₂. In the embodiment shown in Figure 2, control device 15 is formed by an elongated damper 17, which can be turned supported by hinge 18 into different control positions in chamber B_x. By turning an eccentric piece 19 the damper 17 is moved and different control positions are obtained for damper 17.

Figure 3 A shows an embodiment of the invention, wherein the induction ratio control device 15 for controlling the induction ratio between the circulated airflow L₂ and the primary airflow _x is formed by an elongated plate 20, which is moved in a linear direction to close and open a flow path E_x for cir- culated airflow L₂ into mixing chamber B^ Plate 20 of control device 15 closes and opens a flow path into side chamber __\_x. Plate 20 is located on one edge of side chamber B_x in the upper part of chamber B_x. By moving plate 20 to various control positions, flow L₂ is throttled, and at the same time the length ofthe flow path of flow L₂ is affected and thus the induction distance is affected, that is, that distance over which supply airflow ^~ _X induces the circulated airflow L₂.

Figure 3B is an axonometric view of the structure shown in Figure 3 A. Plate 20 can be positioned in different positions in relation to plate 13. Screw R_x is placed through groove ul in plate 20 to be mounted to the plate, that is, to air guiding part 13 in its mounting hole.

Figure 3C shows an embodiment of the invention, which is otherwise similar to the embodiment shown in Figure 3 A and in Figure 3B, except that plate 20 is formed as a turning damper 30, which is turned around pivot point IN^ located close to nozzles 12a_l512a₂ on a side surface of supply air chamber 11.

Figure 3D shows a supply air terminal device according to the invention, including nozzles 12a_b12a₂ opening from a supply air chamber, whereby the supply air flow Li is conducted tlirough the nozzles directly to be close to ceiling K,. in the room, where due to the coanda effect it will cling and flow along the ceiling. Supply airflow L_x induces a circulated airflow L₂ centrally through the device, and the induction ratio Q₂/Qι between the flows L₂ and L_x is controlled by an induction ratio control device 15, which includes a turning damper 20 turning at pivot point Nj in supply air chamber 11. The structure is symmetrical in relation to vertical central axis Y^

Figure 4A shows an embodiment ofthe invention, wherein the induction ratio control device 15 is fitted in connection with nozzles 12a₁,12a₂..., 12b_l3

12b₂... in such a way that on the supply side ofthe nozzles (in relation to flow Li) there is an aperture plate 24, which can be brought into different covering positions in relation to the supply apertures jι,j₂...; n_l5n₂ of the nozzles 12aj 12a₂, 12bι 2b₂

Figure 4B shows the area X_tof Figure 4A on an enlarged scale. By moving control plate 24 in a linear direction as shown by arrow S_1} the position of apertures f_l5f₂ tι,t₂ in control plate 24 is affected in relation to supply apertures jι,j₂...; nι,n₂... of the nozzle rows 12aι,12a₂..., 12bι,12b₂... When in addition the nozzles 12aι,12a₂..., 12bι,12b₂... are chosen as desired in relation to each other, it is possible by changing the flow between the nozzle rows to obtain the desired throw pattern and flow velocity for the primary airflow L_x from the primary airflow nozzles and thus the desired induction ratio is obtained between flows Lj and L₂. In the embodiment shown in Figure 4A, supply air chamber 11 includes two nozzle rows side by side; a nozzle row formed by nozzles \2%._x,\2&^, ..., wherein the cross-sectional flow area of the nozzles is larger than the cross-sectional flow area of the nozzles 12b 12b₂... in the lower row of nozzles. In addition, nozzles 12aι,12a₂... extend longer into side chamber Bi than the lower nozzles 12bι,12b₂... By moving aperture plate 24 in a linear direction as shown by arrow S_t in Figure 4B, the airflow through nozzles 12aι,12a₂..., 12bι,12b₂... is controlled. Thus, by moving aperture plate

24 in a linear direction (arrow S_x) in relation to supply apertures j_l5j₂ ; n_l9 n₂..., the supply airflow Li is throttled and controlled as desired.

Figure 5 shows an embodiment of the supply air terminal device according to the invention, wherein the supply air chamber 11 is formed by a structure having a circular cross-section and including on both sides of central axis Y_x nozzles 12aι,12a₂..., 12bι,12b₂..., however, so that as is shown in the figure, the nozzles 12bι,12b₂... having the smaller cross-sectional flow area are located on the left side above the row of nozzles 12aι,12a₂... having the larger cross-sectional flow area, and in the figure the order of nozzles is the other way round on the right side of central axis Y_l5 that is, the row of nozzles 12b_1; 12b₂... having the smaller cross-sectional flow area is located below the row of nozzles 12a 12a₂... having the larger cross-sectional flow area. Inside supply air chamber 11 in the induction ratio control device 15 there is a tum- ing control tube 27 including flow apertures fι,f₂..., t_t,t₂... for the nozzles 12a_l5

12a₂..., 12bι,12b₂... located on both sides of central axis Y_x. Thus, by turning control tube 27 the supply air can be made to flow e.g. as shown in the figure only through the nozzles 12aι,12a₂... having the larger cross-sectional flow area, or tlirough the nozzles 12b_l512b₂... having the smaller cross-sectional flow area. In this manner the velocity of flow L_t and the throw pattern in side chamber B_x can be controlled and thus the induction ratio of the said flow L_x to flow L₂ can be controlled. By controlling flow l__x it is thus possible to control the induction ratio between the flows L₂ and Li as desired. Supply air chamber 11 with a circular cross-section is located centrally in the structure. In the embodiment shown in the figure, the device includes a top ceiling plate

10c connecting side plates lib, whereby the structure is formed as shown in the figure as a structure open at the top and closed on the sides and at the bottom.

Figure 6A shows an embodiment of the invention, wherein the supply air terminal device includes a supply air chamber 11 and on its sides a side plate 10b, whereby between side plate 10b and supply air chamber 11 a flow path 40 is left for the circulated airflow L₂. The device is open at the top and at the bottom and it thus includes flow apertures Ti and T₂ in the top and bottom parts of the device; flow apertures T_t for the circulated airflow L₂ and flow apertures T₂ for the combined flow Li + L₂ leaving the device. Through the nozzles 12aι,12a₂...; 12b_l312b₂... located on the side surface of supply air chamber 11 and located in rows over the length of the device the supply air flow, that is, the primary airflow Li is conducted into mixing chamber B_! below flowing path 40. The said primary airflow Li induces the circulated airflow L₂ from aperture T_x through flow path 40 into mixing chamber B_l5 and the combined airflow _x + L₂ is conducted sideways from the device guided by side plate 10b and air guiding part 13 ofthe device.

It is possible within the scope of the invention to control the induction ratio between flows L₂ and Li by arranging the central flow guiding part 130 of the structure to be movable in relation to supply air chamber 11. Such an embodiment may also be possible within the scope of the invention, wherein the side plates 10b of the device are arranged to be movable in relation to supply air chamber 11. The transfer is indicated by arrows Mi.

Figure 6B shows an embodiment, wherein side plate 10b of the device includes an associated turning control damper 30 as the induction ratio Q₂/Q_ϊ control device 15. Control damper 30 is fitted to be turning around pivot point Ni. Control can be perfonned either manually or by a motor by remote opera- tion. By changing the position of control damper 30 the induction ratio between the flows L₂ and Li can be controlled.

Figure 7A shows an embodiment ofthe invention, which is especially suitable for mounting on a wall J. As shown by the figure, supply air chamber 11 in the same way as in the previous embodiment includes nozzle rows of nozzles

12aι,12a₂... and 12b_!,12b₂..., whereby the supply airflow _x, preferably fresh supply air, is conducted through the nozzles of the nozzle rows into mixing chamber B_l9 and the said primary airflow L draws along circulated air from room H, whereby the circulated airflow is indicated by arrows L₂ in the figure. The said circulated airflow L₂ or secondary airflow is conducted to join flow

Li in mixing chamber B_x through the elongated flow aperture 31 in side plate 10b of the device. The device includes end plates lOd. The combined airflow Li + L₂ is conducted out of the device obliquely upwards and preferably close to ceiling D in room H, where the combined airflow L_x + L₂ clings to the ceiling due to the coanda effect and flows forward in the room space close to ceiling D. Figure 7B shows an embodiment otherwise similar to the one in Figure 7A, except that in this embodiment the control damper 30 functioning as the induction ratio control device 15 is fitted close to the nozzle rows and it turns around pivot point N^ Thus, by turning control damper 30 the induction ratio Q₂/Qι can be controlled, that is, that ratio in which flow I-_! induces or draws along the circulated airflow L₂ from room space H. Pivot N_x is fitted into the side surface of supply air chamber 11. Damper 30 can be turned either manually or by remote control by a motor, preferably by an electric motor.

Figure 8 A shows an embodiment of the invention, wherein the supply air terminal device includes a supply air chamber 11 and on its both sides on both sides of central axis Y_x side plates 10b, whereby between each side plate 10b and supply air chamber 11 a flow path 40 remains for the circulated airflow L₂ ofthe room space or such through the device. Thus, as shown in the figure, the device is open both at the top and at the bottom, and it includes flow apertures

Ti for the circulated airflow L₂ in the top part of the device as shown in the figure and a central flow aperture T₂ in the bottom part of the device for the combined supply and circulated airflows L_x + L₂. The nozzles

12bι,12b₂... located in two nozzle rows direct supply airflow Lj downwards as shown in the figure. With the aid of the said supply airflow Li a circulated airflow L₂ is induced from room space H. The combined airflow Li + L₂ flows downwards from the device according to the embodiment shown in the figure.

Such an embodiment ofthe induction ratio control device 15 is possible within the scope of the invention, wherein side plates 10b are fitted to be movable in relation to supply air chamber 11 as shown by arrows M in the figure.

Figure 8B shows a control damper 30 as the induction ratio control device 15, which damper is fitted to turn around pivot point N_l5 whereby pivot point Ni is located in supply air chamber 11 on its side surface. By turning damper 30 manually or by a motor the induction ratio between flows L₂ and l__x can be controlled. Figure 8B also shows such an embodiment with dashed lines, wherein instead of a turning damper 30 the damper can be moved in a linear direction on the side wall of the supply air chamber either manually or by a motor in order to control the induction ratio between flows L₂ and _x.

Figure 9A shows an embodiment of the invention, wherein as shown by the figure supply air terminal device 10 includes a structure open both at the top and on the sides. Supply air chamber 11 includes nozzles 12a_l512a₂...; 12bι, 12b₂... located in two rows and as shown in the figure directing supply airflow Li downwards from the device. As the figure shows, the device includes a lower supply aperture T for the circulated airflow L₂ and a lower discharge aperture T₂ for the combined airflow Li + L₂. Thus, the supply airflow Lj conducted from the nozzles will induce a circulated airflow L₂ to flow first into side chamber Bi in between separating plate 33 and side plate 10b and further through the free flow path E_x between separating plate 33 and supply air chamber 11 to join supply airflow Li. Thus circulated airflow L₂ turns in a direction of close to 180° after joining the supply airflow L_x. The combined airflow Li + L₂ flows in between separating plates 33 centrally in the device and downwards.

Such an embodiment is possible within the scope ofthe invention, wherein the induction ratio control device 15 is formed by movable separating plates 33, which are fitted to be movable towards supply air chamber 11 and away from it. Arrows M_x show the said transfer and the induction ratio control.

As is shown in Figure 9B, a control damper 30 is located in between separating plate 33 and supply air chamber as the control device 15 for controlling the induction ratio between flows L₂ and L_1} which damper 30 is fitted to pivot around pivot point Nj from supply air chamber 11 controlled either manually or by remote control by a motor, e.g. an electric motor. By turning damper 30, the induction ratio Q₂/Q_x between the flows L₂ and _x can be controlled. With the device according to the invention, an induction ratio Q₂/Qι typically in a range of 2-6 is achieved.

Figures 10A-10J show some advantageous positions of devices according to the invention. The devices according to the invention may be located either in the ceiling of the room or at a distance from it close to ceiling K_a ofthe room, or devices 10 may be located on a wall or in the floor L_a.

As is shown in Figure 10A, the supply air terminal device 10 is fitted in ceil- ing K_a of the room and it is arranged to direct the supply airflow L_x + L₂ on both sides of the central axis of the device close to the ceiling. The device solutions shown in the embodiments of Figure 1A and Figure 6A are suitable, among others, for the solution shown in Figure 10 A.

Figure 10B shows an embodiment, wherein flow jets Li + L₂ are directed on both sides of the central axis of the device and obliquely downwards into the room space. For example, the device solutions shown in Figures 1A and 9 A are suitable for the embodiment according to Figure 10B.

Figure 10C shows an embodiment, which blows the supply air jet L_x + L₂ on one side of the device only and close to the ceiling. For example, the device solutions shown in Figure 1A and in Figure 7 A are suitable for the embodiment according to Figure IOC.

Figure 10D shows an embodiment of the invention, which blows the supply air jet Li + L₂ directly downward, and the device is fitted at a distance from the ceiling. The device solutions of Figure 8 A and Figure 9A are suitable for the embodiment shown in this figure.

Figure 10E shows an embodiment, wherein the supply air jet is directed on both sides and wherein the device solution is located at a distance from the ceiling. The device solutions according to Figure 1A and Figure 6A are suitable for the embodiment shown in this figure.

Figure 10F shows a floor embodiment, wherein the device is located under the floor and it is arranged to blow the supply air jets in two opposite directions at the floor surface level. The device solutions according to Figures 1A, 6A and 7A are suitable for the embodiment shown in this figure.

Figure 10G shows an embodiment, which blows the supply air jet from the floor directly upwards. The device solutions according to Figures 8 A and 9A are especially suitable for the solution according to the embodiment of this figure.

Figure 10H shows the device in a wall position, and the device blows the supply air jet directly in the normal direction of the wall. The device solutions shown in Figures 7A, 8A and 9A are especially suitable for the embodiment of this figure.

Figure 101 shows a wall embodiment, wherein the device blows obliquely close to the ceiling. The device solutions shown in Figures 7A, 8A and 9A are especially suitable for the supply of air shown in this figure.

Figure 10J shows an embodiment of the invention, wherein the air is directed from the supply air terminal device in a parallel direction with the wall surface and the device is located in a lower part of the wall. The device solution according to Figure 7A is especially suitable for the supply of air shown in Figure 10J.

It is obvious that in the above-mentioned positions such a device may be used, which includes an induction ratio control device.

Claims

1. Supply air terminal device (10), characterised in that a) the supply air terminal device includes a supply air chamber (11) and from this several nozzles (12a_l512a₂...; 12bι,12b₂...) or a nozzle gap, through which a supply airflow ( _x) is conducted into a mixing chamber (Bi) inside the device, b) and that the supply air terminal device includes a flow aperture (T_x) on some side of the device, through which a circulated airflow (L₂) is con- ducted from the room, whereby the said circulated airflow is conducted to join the supply airflow ( _x) induced by the supply airflow (L_t), and that the flows combine in the mixing chamber (B_x) inside the device, and that the combined airflow (Li + L₂) of the supply airflow (Li) and the circulated airflow (L₂) is made to flow further out ofthe device (FIG. 1 A - FIG. 9B).

2. Supply air terminal device according to claim 1, characterised in that the mixing chamber (Bi) opens through a flow gap (T₂) into the room space (H) (FIG. 1 A - FIG. 9B).

3. Supply air terminal device according to claim 1 or 2, characterised in that the device includes a supply air chamber (11) and on its side at a distance from it a side plate (10b) and that the device is open at the top and at the bottom in such a way that it includes flow apertures (T_]3T₂) in the top and bottom parts of the device, whereby the mixing chamber (B_x) is open at the top and at the bottom, and that supply air chamber (11) includes a nozzle gap or nozzles

(12aj,12a₂...; 12b_l512b₂...) located on a side surface, through which the supply airflow ( ) is conducted into mixing chamber (B^, whereby the supply airflow (Li) induces a circulated airflow to flow through flow apertures (T_x) into mixing chamber (B_x), and that the combined airflow (Li + L₂) of the supply airflow (Li) and the circulated airflow (L₂) flows away from the device through the aperture (T₂) in mixing chamber (Bi). (FIG. 6A).

4. Supply air terminal device according to the preceding claim, characterised in that the side plate (10b) includes an associated turning control damper (30) arranged to turn around a pivot point (N_x) in order to control the induction ratio between the flows (Li and L₂). (FIG. 6B).

5. Supply air terminal device according to any one ofthe preceding claims 1, 2 or 3, characterised in that the induction ratio control device (15) is formed by an arrangement, wherein a side plate (10b) is movable (arrow Mi) in relation to the supply air chamber (11).

6. Supply air tenninal device according to claim 1, characterised in that the equipment includes a mixing chamber (β_x) located between the supply air chamber (11) and the side plate (10b), into which mixing chamber the supply airflow (Li) is conducted, and that the said supply airflow (Li) draws along a circulated airflow (L₂) from the room to join itself in the mixing chamber (Bi) through a flow aperture (31) in the side plate (10b), and that the combined airflow (Li + L₂) is conducted out of the device obliquely upwards, preferably close to the ceiling (FIG. 7A).

7. Supply air terminal device according to the preceding claim, characterised in that there is a control damper (30), which can be turned into different control positions, and that the control damper (30) is joined in association with the supply air chamber (11) close to nozzles (12aι,12a₂...; 12bι,12b₂...), whereby the damper functions as a control device for the induction ratio between the flows (Lι,L₂). (FIG. 7B).

8. Supply air terminal device according to claim 1, characterised in that the supply air chamber (11) includes side plates (10b) on both sides, whereby a flow path (40) remains in between the supply air chamber (11) and the side plate (10b), and that the side chamber (B_x) in its top part includes a flow aper- i

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ture (T for the circulated airflow (L₂), and that the supply airflow ( _x) is conducted from the supply air chamber (11) through nozzles (12aι,12a₂...; 12bι,12b₂...) downwards towards the lower flow aperture (T₂), whereby the supply airflow (L_x) induces the circulated airflow (L₂) to flow to join itself and the combined airflow ( _x + L₂) is made to flow through the flow aperture (T₂) and out ofthe device. (FIG. 8A).

9. Supply air terminal device according to the preceding claim, characterised in that the equipment as the induction ratio control device includes a control damper (30), which is fitted on a side surface of the supply air chamber (11), whereby by turning the damper (30) the induction ratio between the flows (L₂ and Li) can be controlled. (FIG. 8B).

10. Supply air terminal device according to claim 1, characterised in that the supply air terminal device includes a supply air chamber (11), and that the supply air terminal device is a structure open at the top and closed on the sides and it includes two separating walls (33), whereby each side chamber (B_x) of the device is limited by a side plate (10b) of the device and by one separating wall (33), and that between the separating walls (33) there is a discharge ap- erture (T₂), from which the combined airflow (L_x + L₂) of the supply airflow and the circulated airflow leaves the device, whereby the supply air chamber (11) includes nozzles (12aι,12a₂...; 12bι,12b₂...), which are directed from between the central separating walls (33) of the device towards the discharge aperture (T₂), whereby the supply airflow (Li) is directed downwards, which supply airflow (L,) induces the circulated airflow (L₂) to flow to join the supply airflow (L ) first in the side chamber (B_x) and further out ofthe side chamber (Bi) to the centre of the device, and that the combined airflow (Li + L₂) is conducted out of the device between the separating walls (33) through the discharge aperture (T₂) (FIG. 9A).

11. Supply air terminal device according to the preceding claim, character- ised in that the induction ratio control device (15) is a control damper (30), which is arranged to turn around a pivot point (N_x) associated with the supply air chamber (11), and the control damper (30) is used to control the induction ratio between the circulated airflow (L₂) and the supply airflow (Li). (FIG. 9B)

12. Supply air terminal device according to claim 10, characterised in that the induction ratio control device (15) is an arrangement, wherein the separating walls (33) of the device are arranged to be movable towards the supply air chamber (11) and away from it in order to control the induction ratio between the flows (L₂ and _x).

13. Supply air terminal device according to claim 1, characterised in that the supply air terminal device (10) includes a supply air chamber (11) and from this a nozzle gap or several nozzles (12aι,12a₂) for the supply airflow (L_x) into the side chamber (Bi), and that the supply air terminal device is a structure closed on the sides and at the top including side plates (10b) and an air guiding part (13), whereby in the device in between the air guiding parts (13) located on both sides ofthe central axis (Y_x) ofthe device there is a free flow path (Ei) below the supply air chamber (11) for the circulated airflow (L₂) arriving from the room (H) into the side chamber (Bi), whereby in the device the supply air chamber (11) includes a nozzle gap or nozzle gaps (12aι,12a₂..., 12bι, 12b₂...) to conduct the supply airflow (L_x) into the side chamber (B^ and to induce the circulated airflow (L₂) with the aid of the said airflow (Li) from the room space (H) into side chamber (B_x) (FIG. 1A).

14. Supply air terminal device according to claim 13, characterised in that the equipment includes a control device (15) for the induction ratio between the circulated airflow (L₂) and the supply airflow (L_), which control device is used to control in which ratio there is supply air (Li) and circulated air (L₂) in the combined airflow (Lι,L₂) (FIG. IB).

15. Supply air terminal device according to claim 13, characterised in that the induction ratio control device (15) is fitted in between the air guiding parts (13) (FIG. IB).

16. Supply air terminal device according to the preceding claim, characterised in that the induction ratio control device (15) includes an aperture plate (16aι) located in a fixed position and another movable aperture plate (lόa^, whereby by moving the movable aperture plate (16a₂) it is possible to control the position ofthe apertures (a^ ...) ofthe movable aperture plate in relation to the apertures (bι,b₂...) of the aperture plate (16al) located in a fixed position, and it is further possible to control the total cross-sectional flow area for the circulated airflow (L₂) tlirough the aperture plates (16aι,16a₂) (FIG. IC, FIG. ID, FIG. IE).

17. Supply air tenninal device according to claim 14, characterised in that the side chamber (Bi) includes an induction ratio control device (15), which is formed by a turning control damper (17), which can be made to open and close the flow (Li + La) in the side chamber (B_x) (FIG. 2).

18. Supply air terminal device according to claim 14, characterised in that the induction ratio control device (15) is fitted in the top part of the side chamber (Bi) at its one edge to close and open a flow path (14) into the side chamber (B) (FIG. 3A, FIG. 3B).

19. Supply air terminal device according to the preceding claim, characterised in that the induction ratio control device (15) is a straight plate (20), which is moved in a linear direction (arrow Si) either manually or using an electric motor (FIG. 3A, FIG. 3B).

20. Supply air terminal device according to claim 18, characterised in that the control device (15) is a turning damper (30) (FIG. 3C). * _*

26

21. Supply air terminal device according to claim 14, characterised in that the induction ratio control device (15) is formed by a control plate (24) including flow apertures (f_1;f₂...; tι,t₂...) closing and opening a flow path to nozzles (12aι,12a₂..., 12bι,12b₂...), which are located in two separate rows and which have mutually different cross-sectional flow areas, whereby the induction ratio control device (15) can be used to control the flow either through the nozzles (12aι,12a₂...) with the larger cross-sectional flow area or through the nozzles (12bι,12b₂...) with the smaller cross-sectional flow area, and thus to control the flow velocity of the primary airflow (Li) and the throw pattern into side chamber B_x), and thus also the inducing effect ofthe said primary airflow ( _x) on the secondary air (L₂) (FIG. 4A, FIG. 4B).

22. Supply air terminal device according to claim 14, characterised in that the supply air terminal device (10) includes side plates (10b) and a covering plate (10c) and below this it includes a supply air chamber (26) having a circular cross-section, and that inside it there is a turning control tube (27) and in this there are flow apertures (fi,f₂...; t_l5t₂...) on both sides of the vertical central axis (Yi), whereby by turning control tube (27) its position can be controlled in relation to the nozzles (12aι,12a₂..., 12bι,12b₂...) located in two separate rows, whereby the nozzles (12aι,12a₂...) have a cross-sectional flow area different from that of the nozzles (12bι,12b₂...) in the other row, whereby by using the control tube it is possible to control the flow into the nozzles (12a \2&_..., 12b_l512b₂...) of the separate nozzle rows and thus to control the flow velocity of the supply airflow (L_x) into side chamber (B_x) and also the induc- ing effect of supply airflow (L_x) on the circulated airflow (L₂) arriving through flow path (Ei) to join the primary airflow (Li) (FIG. 5).

23. Supply air terminal device according to claim 14, characterised in that the control damper (30) is joined to the supply air chamber tlirough a pivot point (NO, which^'control damper can be turned into different control positions in order to control the induction ratio between the circulated airflow (L₂) and the supply airflow (L_) (FIG. 3C).

24. Supply air terminal device according to claim 14, characterised in that the induction ratio control device (15) is fonned by a structural entity (130), which is movable towards the supply air terminal device and away from it and which includes air guiding parts (13) and a structure connecting these, whereby the circulated airflow travels in between the air guiding parts (13) to join the primary airflow (Li).

AMENDED CLAIMS

[received by the International Bureau on 28 March 2002 (28.03.02); original claim 1 amended; remaining claims unchanged (1 page)]

1. Supply air terminal device (10), characterised in that a) the supply air terminal device includes a supply air chamber (11) and from this several nozzles (12aι,12a₂...; 12bι,12b ...) or a nozzle gap, tlirough which a supply airflow (Li) is conducted into a mixing chamber (Bi) inside the device, b) and that the supply air tenninal device includes a flow aperture (Ti) on some side of the device, through which a circulated airflow (L₂) is con- ducted from the room, whereby the said circulated airflow is conducted to join the supply airflow (Li) induced by the supply airflow (Li), and that the flows combine in the mixing chamber (Bi) inside the device, and that the combined airflow (Li + L₂) of the supply airflow (Li) and the circulated airflow (L₂) is made to flow further out of the device, and that the circu- lated airflow is neither heated nor cooled by a heat exchanger, but the circulated airflow arrives from the room space to join the primary airflow directly (FIG. 1 A - FIG. 9B).

2. Supply air terminal device according to claim 1, characterised in that the mixing chamber (Bi) opens through a flow gap (T₂) into the room space (H)

(FIG. 1 A - FIG. 9B).

3. Supply air terminal device according to claim 1 or 2, characterised in that the device includes a supply air chamber (11) and on its side at a distance from it a side plate (10b) and that the device is open at the top and at the bottom in such a way that it includes flow apertures (T.,T₂) in the top and bottom parts of the device, whereby the mixing chamber (B is open at the top and at the bottom, and that supply air chamber (11) includes a nozzle gap or nozzles (12aι,12a ...; 12bι,12b₂...) located on a side surface, through which the sup- ply airflow (Li) is conducted into mixing chamber (Bi), whereby the supply airflow (Li) induces a circulated airflow to flow through flow apertures (TO