FI125084B - Supply air device and method in an supply air device - Google Patents

Description

Supply air device and method in supply air device Tilluftanordning och förfarande i en tilluftanordning

ENGINEERING

The invention relates to an air supply device according to the preamble of claim 1.

The invention also relates to a method in the supply air device according to the preamble of claim 5.

BACKGROUND OF THE INVENTION

The supply air devices or air-conditioning beams generally comprise an supply air chamber, a mixing chamber and a heat exchanger. The fresh air flow is led from the supply air chamber through the nozzles to the mixing chamber, where the fresh air flow induces a recirculated air flow from the air conditioner through the heat exchanger to the mixing chamber. The combined air flow formed from the fresh air flow and the recirculated air flow in the mixing chamber section is led from the outlet of the mixing chamber to a space to be ventilated. The same supply air unit can be used to cool room air during the summer and to heat the room during the winter. During the summer, the recirculated air in the room is cooled down and heated in the supply air heat exchanger during the winter.

Nowadays more and more attention is paid to the energy consumption of a building. The climate system has proved to be a highly competitive system in terms of both investment and operating costs for the ventilation and cooling and / or heating of the air-conditioned space. Typically, the air-conditioning beam operates at minimum airflow, that is, only the amount of air required by the official regulations for that space is supplied to the air-conditioning beam. FI patent application 20060035 discloses one solution in which the amount of air supplied from the air-conditioning beam to the air-conditioned space can be subsequently changed as the need for use of the air-conditioned space changes from e.g. an office room to a conference room. This change is accomplished by adding a proportion of fresh supply air from the air-conditioning beam to the air-conditioned space by opening and closing the separate auxiliary air regulator bypassing the nozzles of the supply air chamber. A constant amount of air flows from the nozzles of the supply air chamber to the room to be ventilated, regardless of whether the additional air damper is open or closed.

To minimize energy consumption, it would be advantageous if the air flow through the nozzles could also be reduced or completely shut off when the space to be ventilated is empty.

Prior art solutions have not satisfactorily solved this problem.

SUMMARY OF THE INVENTION

The main features of the supply air device according to the invention are set forth in the characterizing part of claim 1.

The main features of the method according to the invention are set forth in the characterizing part of claim 5.

The supply air device according to the invention comprises a manifold chamber, a nozzle chamber having nozzles or a nozzle slot, an additional air chamber, at least one mixing chamber and at least one heat exchanger. The fresh air flow is led from the dispensing chamber to: and - an auxiliary air chamber from which a separate additional air flow is further directed directly to the air-conditioned space.

The solution according to the invention is characterized in that the nozzle chamber is divided into at least two partial nozzle chambers and that the supply air device further comprises a control element located between the manifold and the first nozzle chamber, second nozzle chamber and auxiliary air chamber a partial nozzle chamber and / or another partial nozzle chamber and / or auxiliary air chamber.

The solution according to the invention enables the flow of air through the nozzles of the nozzle chambers and the amount of separate additional air flow to be controlled by one manual actuator or by an actuator automatically connected to the actuator.

By dividing the nozzle chamber into two partial nozzle chambers, five modes of operation with the supply air device can be achieved by using a control plate placed between the manifold chamber and the first partial nozzle chamber, the second partial nozzle chamber and the auxiliary air chamber.

In the first mode of operation, the flow of air from the distribution chamber to the first and second nozzle chambers and to the auxiliary air chamber is completely closed.

In the second mode of operation, the flow of air from the distribution chamber to the first part nozzle chamber is opened, but the second part nozzle chamber and the auxiliary air chamber are kept closed.

In the third mode of operation, the flow of air from the distribution chamber to the first and second partial nozzle chambers is opened, but the auxiliary air chamber is kept closed.

In the fourth mode of operation, the flow of air from the distribution chamber to the first and second part nozzle chambers and the auxiliary air chamber is opened.

In the fifth mode of operation, the flow of air from the distribution chamber to the first and second partial nozzle chambers is closed and the flow of air to the auxiliary air chamber is opened.

The solution according to the invention can also be used to regulate the recirculated air flow through the heat exchanger. The fresh air flow from the nozzles of the first partial nozzle chamber to the mixing chamber induces the recirculated air flow to pass only through that portion of the heat exchanger which is connected to the mixing chamber by the portion of the first partial nozzle chamber. The heat exchanger portion communicating with one of the partial nozzle chambers does not pass recirculated air flow when no fresh air flow from the distribution chambers is conducted to the second partial nozzle chamber.

The solution of the invention can be applied to both a constant air flow and a constant pressure air conditioning system.

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, but which are not intended to be limited thereto.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is an axonometric view of an supply air device in which the solution of the invention can be applied.

Figure 2 is an axonometric view of the supply air device shown in Figure 1 with internal parts visible.

Figure 3 is a transverse sectional view of the supply air device shown in Figures 1 and 2.

Figure 4 is a transverse sectional view of another supply air device in which the solution of the invention can be applied.

Figure 5 is a longitudinal cross-sectional view of the supply air chamber structure of the supply air device.

Figure 6 illustrates the operating principle of the control solution shown in Figure 5.

Figure 7 shows various operating modes of the supply air device applying the solution according to the invention.

Figure 8 shows a top view of an alternative control solution according to the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Figures 1 shows a transverse cross-section of an supply air device in which the solution according to the invention can be applied.

The supply air device 100 shown in FIG. 11. A flow of fresh air is led to the inlet 21 of the distribution chamber 20 by a fresh air duct extending into a space to be ventilated and a fan not shown in the figure.

Below the supply air chamber 10, 11 there is provided an elongated rectangular heat exchanger 12. Below the heat exchanger 12 there is a base plate 18 with openings at the heat exchanger 12. The recirculation airflow L2 flows from the air conditioner through the heat exchanger 12 to the supply air device where it mixes with the fresh air flow L1. The combined air flow LA, LB formed from the fresh air flow L1 and the recirculated air flow L2 flows out of the supply air device to the sides.

Figure 2 is an axonometric view of the supply air device shown in Figure 1 with internal parts visible. The figure shows that the supply air chamber 10, 11 consists of a nozzle chamber 10 and an auxiliary air chamber 11. The nozzle chamber 10 is in turn divided into a first partial nozzle chamber 10a and a second partial nozzle chamber 10b. One nozzle array 15b is shown in the nozzle chamber 10. The bottom of the distribution chamber 20 also shows openings 1a, 2a, 3a leading to each chamber 10a, 10b, 11. The heat exchanger 12 extends in the longitudinal direction of the device only to the area of the nozzle chamber 10, but not to the area of the auxiliary air chamber 11. The auxiliary air chamber 11 is an open chamber, at the bottom of which a fresh auxiliary air flow L3 flows with a small impulse to the air-conditioned space. The auxiliary air chamber 11 has no nozzles. The lower part of the auxiliary air chamber 11 is preferably covered by an apertured plate, whereby the additional air flow L3 flows through the openings of the plate into the space to be ventilated.

Figure 3 is a transverse sectional view of the supply air device shown in Figures 1 and 2. The cross-section shows a nozzle chamber 10 having a divider chamber 20 arranged in a vertical side wall. Below the nozzle chamber 10 is a heat exchanger 12 and below a heat exchanger 12 is a bottom plate 18 having folds 18a, 18b on its outer edges. The bottom wall of the nozzle chamber 10 is in the form of a spread M and the outer edges of the bottom wall have guide portions 19a, 19b. The bottom wall of the nozzle chamber 10, the associated guide portions 19a, 19b and the folds 18a, 18b of the base plate 18 form the mixing chambers 13a, 13b and the outlet openings 16a, 16b of the supply air device. The supply air device is symmetrical with respect to the central vertical axis Y-Y, except for the distribution chamber 20 and the inlet 21 leading thereto.

The fresh air flow L1 is led to the inlet 21 of the distribution chamber 20 by a fresh air duct extending into the space to be ventilated and a fan not shown in the figure. From the distribution chamber 20, the fresh air flow L1 is further directed to the nozzle chamber 10, from which the fresh air flow L1 is led through the first nozzle array 15a to the first mixing chamber 13a and through the second nozzle array 15b to the second mixing chamber 13b. A first fresh air stream L1 supplied to the first mixing chamber 13a with a relatively high impulse induces a first recirculated air stream L2 to flow from the air conditioner through the heat exchanger 12 to the first mixing chamber 13a. The second fresh air stream L1 supplied to the second mixing chamber 13b with a relatively high impulse induces a second recirculated air stream L2 to flow from the air conditioner through the heat exchanger 12 to the second mixing chamber 13a. In each mixing chamber 13a, 13b, the fresh air flow L1 and the recirculated air flow L2 are mixed, whereupon the combined air flow LA, LB formed from the fresh air flow L1 and the recirculated air flow L2 is led to the supply air outlet outlets 16a, 16b. The supply air device 100 is preferably arranged in connection with the ceiling of the room to be ventilated so that the bottom plate 18 of the supply air device 100 is flush with the ceiling of the room to be ventilated.

Fig. 4 is a transverse sectional view of another supply air device in which the solution of the invention can be applied.

The supply air device 100 shown in FIG. shown in the figure.

An elongated first heat exchanger 12a of rectangular cross-section is provided on the left side of the distribution chamber 20 and a second rectangular second heat exchanger 12b of rectangular cross section is provided on the right side of the distribution chamber 20. Below the supply air chamber 10, 11, a trapezoidal guide member 17 is arranged below the vertical outer side wall 14a of the first heat exchanger 12a and a second vertical side wall 14 below the vertical outer side wall 14 of the second heat exchanger 12b.

In the space defined by the first side wall 14a, the bottom surface of the first heat exchanger 12a, the left side wall of the supply air chamber 10, 11 and the left bevelled side surface of the guide body 17, a first mixing chamber 13a is formed. a second mixing chamber 13b is formed in the space defined by the oblique side surface.

The left side wall of the supply air chamber 10, 11 has a first nozzle array 15a through which a fresh air flow L1 is introduced from the supply air chamber 10, 11 to the first mixing chamber 13a. The right side wall of the supply air chamber 10, 11 has a second row of nozzles 15b through which fresh air flow L1 is led from the supply air chamber 10, 11 to the second mixing chamber 13b. A downwardly directed fresh air flow L1 from each of the mixing chambers 13a, 13b from the nozzles 15a, 15b induces the recirculated air flow L2 to pass through the respective heat exchanger 12a, 12b from the air conditioner into the corresponding mixing chamber 13a, 13b.

At the bottom of the first mixing chamber 13a is a first outlet 16a, from which, in the first mixing chamber 13a, the combined airflow LA formed by the fresh air flow L1 and the recirculating air flow L2 is directed to the left to be ventilated. At the bottom of one mixing chamber 13b there is a second outlet 16b, from which in the second mixing chamber 13b the combined air flow LB formed of fresh air flow L1 and recirculated air flow L2 is directed to the right to be ventilated. The supply air device 100 is preferably arranged in connection with the ceiling of the space to be ventilated at a distance from the ceiling, whereby the combined air flows LA, LB are deflected sideways in the direction of the ceiling.

Figure 5 is a longitudinal cross-sectional view of the supply air chamber structure of the supply air device.

Figure 5 shows a nozzle chamber 10 and an auxiliary air chamber 11 extending thereto. The nozzle chamber 10 is further divided into two parts, the first part nozzle chamber 10a and the second part nozzle chamber 10b. The supply air chamber 10, 11 can thus be formed from a single elongated chamber which is divided into three hermetically separated portions. The manifold chamber 20 extends to the part nozzle chambers 10a, 10b and the auxiliary air chamber 11. Between the manifold chamber 20 and the part nozzle chambers 10a, 10b and the auxiliary air chamber 11 there is a regulating member 30, the actuator 40 can be driven, for example, by a solution based on an electric motor or by a hydraulic cylinder. The actuator 40, in turn, can be controlled by a control unit 60 having a programmable processor that controls the actuator 40 according to a specific control algorithm. The input signals of the control unit 60 can be used, for example, the measurement signal of the temperature sensor 61 located in the air-conditioned space and / or the control device 62 located in the air-conditioned space on the user's desk. The control device 62 may also be coupled to control the damper 30 in conjunction with an automatic control based on a measurement signal from the temperature sensor 61.

Figure 6 illustrates the operating principle of the control solution shown in Figure 5. The figure shows the inlet 1a of the first nozzle chamber 10a, the inlet 2a of the second nozzle chamber 10b and the inlet 3a of the auxiliary air chamber 11 and the openings Ib, 2b, 3b in the control plate 30, respectively. The adjusting plate 40 may be moved in opposite directions S1 and S2 by the actuator 40 such that the desired inlets 1a, 2a, 3a and the openings Ib, 2b, 3b of the adjusting plate 30 overlap. The inlet openings 1a, 2a, 3a of the partial nozzle chambers 10a, 10b and the auxiliary air chamber 11 are located on the wall of the said air chambers 10a, 10b, 11 which is positioned against the distribution chamber 20. Thus, the inlet openings 1a, 2a, 3a of the partial nozzle chambers 10a, 10b and the auxiliary air chamber 11 are in the sidewall of said chambers in the embodiment shown in Fig. 1 and in the ceiling of said chambers in the embodiment shown in Fig. 4. The figure shows an operating state in which the control plate 30 closes the connection to both partial nozzle chambers 10a, 10b and the auxiliary air chamber 11.

Figure 7 shows the various operating states A1, A2, A3, A4 and A5 of the supply air device applying the solution according to the invention. In each of the modes A1, A2, A3, A4 and A5, the inlets 1a, 2a, 3a of the partial nozzle chambers 10a, 10b and the auxiliary air chamber 11 and the corresponding openings Ib, 2b and 3b in the control plate 30 are shown side by side, though they actually overlap. By placing the openings side by side, the figure is more illustrative.

In the first operating state AI, the fresh air flow flowing from the partial nozzle chambers 10a, 10b and the auxiliary air chamber 11 to the air conditioner is completely closed, i.e. the damper 30 covers the inlet 1a, the second partial nozzle chamber 10b, and the auxiliary chamber 11. Thus, air cannot flow from the manifold 20 into the partial nozzle chambers 10a, 10b and the auxiliary air chamber 11. Thus, no supply air from the supply air device 100 flows into the space to be ventilated. This is a so-called energy-saving mode, which can be used, for example, when the condition of the air conditioner is temporarily idle. This mode of operation operates in the same way for a constant air flow and a constant pressure air conditioning system.

In the second mode of operation A2, the first or longer nozzle chamber 10a is in use, i.e. the inlet 1a and the first opening Ib leading to the first partial nozzle chamber 10a, but the nozzle plate 30 covers the inlet 2a of the second partial nozzle chamber 10b and the inlet 3a. Fresh air thus flows from the distribution chamber 20 into the first partial nozzle chamber 10a only. When the supply air device 100 is connected to a constant airflow system and only a portion of the nozzles 15, i.e. the nozzles 15 in the first partial nozzle chamber 10a, are in use, the pressure in the first partial nozzle chamber 10a tends to increase as the constant airflow system tends to maintain the airflow. Therefore, the air discharged from the nozzles 15 of the first part nozzle chamber 10a has a higher velocity / pulse. Higher speeds are useful, for example, in a heating situation whereby the warm air blown from the supply air device 100 to the air conditioner mixes better with the air in the air conditioner. When the supply air device 100 is connected to a constant pressure system, or part of the nozzles 15, i.e. the nozzles 15 in the first partial nozzle chamber 10a, is used, the airflow from the supply air device 100 to the air conditioner is reduced proportionally. This mode, which produces less air, can be used, for example, in a situation where the air conditioner is temporarily empty, thereby improving energy efficiency.

In the third mode A3, both partial nozzle chambers 10a, 10b are in use, i.e. the inlet 1a of the first partial nozzle chamber 10a and the inlet 2a of the second partial nozzle chamber 10b and the first opening Ib and second opening 2b respectively of the nozzle plate. In this mode, the cooling air (water power) of the supply air device 100 is at its maximum and the full effective length of the heat exchangers 12, 12a, 12b is in use and the chamber pressure of the partial nozzle chambers 10a, 10b is normal. This mode of operation operates in the same way for a constant air flow and a constant pressure air conditioning system.

In the fourth mode of operation A4, both the partial nozzle chambers 10a, 10b are opened and, in addition, the auxiliary air chamber 11 is fully or partially opened, i.e. the first partial nozzle chamber 10a inlet 1a, the second partial nozzle chamber 10b inlet 2a the opening 3b overlaps. In a system based on a constant airflow, the airflow through the nozzles is reduced compared to the third mode A3 when the total airflow remains constant. As the airflow of the filter decreases, the recirculated air flow from the air-conditioned space is also reduced, whereby the flow rates of the air-conditioned space are correspondingly reduced and the conditions of the air-conditioned space are improved in this respect. In a system based on constant pressure, the maximum total air volume is reached in this mode. The size of the opening of the auxiliary air chamber 11 depends on the amount of additional air required. This allows you to easily change the function of the air-conditioned space from office to conference room.

In the fifth mode A5, the airflow from the manifold 20 to the partial nozzle chambers 10a, 10b is closed, the airflow from the manifold 20 to the auxiliary air chamber 11 is completely opened. In this mode of operation, the maximum amount of additional air supplied to the air conditioner is maximum. This mode can be used, for example, at night, when only cool outdoor air is used to cool the air condition. This office works in the same way for a constant air flow and a constant pressure air conditioning system.

Figure 8 shows a top view of an alternative control solution according to the invention. In this embodiment, a circular adjusting plate 50 is used as an adjusting member instead of a rectangular adjusting plate. The radius of the outer circumference of the circular adjusting plate 50 is R1. In the circumference of the circle R2 drawn inside the outer periphery of the circular adjusting plate 50, openings 1a corresponding to a rectangular adjusting plate are formed. 2a, 3a. The figure further shows the inlets Ib, 2b, 3b from which the duct leads to the corresponding chamber, i.e. the first nozzle chamber 10a, the second nozzle chamber 10b and the auxiliary air chamber 11. The circular adjusting plate 50 is rotatably supported from its center point C. S2. By rotating the circular adjusting plate 50 about its center C clockwise from the position shown in Figure 5, the five modes of operation shown in Figure 5 are achieved. Rotation of the circular adjusting plate 50 may be performed manually or by actuator 40 as in the embodiment shown in Fig. 4. As an actuator 40, for example, an electric motor can be used. The figure shows an operating state in which the shim plate 30 closes the connection to both nozzle chambers 10a, 10b and the auxiliary air chamber 11. The use of the circular shim plate 50 requires a larger surface area than the rectangular shim plate 30 to equalize the apertures. The height of the side wall of the supply air chamber 10, 11 does not generally allow the circular adjusting plate 50 to be mounted on the side wall, but the width of the ceiling surface of the supply air chamber 10, 11 may allow the circular adjusting plate 50 to be mounted on the ceiling.

The supply air device shown in Figures 3 has only one nozzle chamber 10 having two rows of nozzles 15a, 15b, each feeding its own mixing chamber 13a, 13b. There is also only one heat exchanger 12 through which the recirculated air flow L2 is led to each mixing chamber 13a, 13b. Part of the heat exchanger 12 serves the first mixing chamber 13a and part of the heat exchanger 12 serves the second mixing chamber 13b.

The embodiment shown in Figure 4 also has only one nozzle chamber 10 having two rows of nozzles 15a, 15b, each feeding its own mixing chamber 13a, 13b. In this solution, each mixing chamber 13a, 13b is associated with its own heat exchanger 12a, 12b through which recirculated air flow L2 is led to said mixing chamber 13a, 13b.

For example, the embodiment shown in Fig. 4 may be modified such that a supply air chamber 10, 11 and a distribution chamber 20 are disposed in place of each heat exchanger 12a, 12b and a heat exchanger 12 in place of the supply air chamber 10, 11 and the distribution chamber 20. and auxiliary air chamber 11 and each nozzle chamber 10 is in turn divided into at least two partial nozzle chambers 10a, 10b. The nozzles 15 are now located in the bottom wall of each part nozzle chamber 10a, 10b, from which fresh air flow L1 is directed to each mixing chamber 13a, 13b. In such an embodiment, a separate baffle plate 30 may be used between each unit formed by the manifold chamber 20 and the supply air chamber 10, 11, wherein each unit is controlled by its own baffle plate. On the other hand, the adjusting plates of each unit can be mechanically interconnected so that the adjustment in both units is carried out simultaneously by one and the same adjusting element.

The embodiment shown in Fig. 4 can also be modified e.g. by omitting one heat exchanger 12b, another mixing chamber 13b and another nozzle array 15b completely. There remains a supply air device with one mixing chamber 11a 13a, one heat exchanger 12a, one nozzle array 15a. The distribution chamber 20 and the supply air chamber 10, 11 remain unchanged.

In the supply air devices shown in the figures, the cross-sections of the various chambers are rectangular, but for the purposes of the invention, of course, the cross-sections of the chambers may also be of other forms, eg circular, triangular, trapezoidal or polygonal.

In the embodiments shown in the figures, the nozzle chambers 10a, 10b use nozzles 15, 15a, 15b, but the nozzles 15, 15a, 15b can also be replaced by a nozzle slot.

In the embodiments shown in the figures, the nozzle chamber 10 consists of two partial nozzle chambers 10a, 10b, but the solution of the invention can of course also be applied in a situation where the nozzle chamber 10 is divided into more than two parts. This allows the device to achieve even more office space.

Only some preferred embodiments of the invention have been described above, and it will be apparent to those skilled in the art that they may be subject to numerous modifications within the scope of the appended claims.

Claims (8)

An supply air device comprising: - a distribution chamber (20), - a nozzle chamber (10) having nozzles (15, 15a, 15b) or a nozzle slot, - an auxiliary air chamber (11), - at least one mixing chamber (13, 13a, 13b), and - at least one heat exchanger 12, 12a, 12b), wherein the fresh air flow (L1) is led from the distribution chamber (20) to: - a nozzle chamber (10) from which the fresh air flow (L1) is further directed through the nozzles (15, 15a, 15b) or at least one mixing chamber (13, 13a, 13b), wherein the fresh air flow (L1) induces a recirculating air flow (L2) to flow from the condition to be ventilated through said at least one heat exchanger (12, 12a, 12b) to said at least one mixing chamber (13, 13a) , 13b), the combined air flow (LA, LB) formed from the fresh air flow (L1) and the recirculated air flow (L2) is led to a room to be ventilated, and - an additional air chamber (11) from which a separate - the nozzle chamber (10) is divided into at least two partial nozzle chambers (10a, 10b), - the supply air device further comprises a control element (30, 50) located in the manifold chamber (20) and the first nozzle chamber (10a), second nozzle chamber (10b) and ) so that one and the same adjusting member (30, 50) can open and close the connection from the distribution chamber (20) to the first part nozzle chamber (10a) and / or the second part nozzle chamber (10b) and / or the auxiliary air chamber (11). Supply air device according to claim 1, characterized in that the first part nozzle chamber (10a), the second part nozzle chamber (10b) and the auxiliary air chamber (11) each comprise an inlet (1a, 2a, 3a) on the surface facing the distribution chamber (20), and that the adjusting member (30, 50) consists of a adjusting plate (30, 50) having openings (Ib, 2b, 3b), whereby the desired connection from the manifold chamber (20) to the first part nozzle chamber (10a) can be opened and closed. and / or a second partial nozzle chamber (10b) and / or auxiliary air chamber (11). Supply air device according to claim 2, characterized in that the supply air device further comprises an actuator (40) by means of which the adjusting plate (30, 50) can be moved. Supply air device according to Claim 2 or 3, characterized in that the supply air device comprises five modes which can be selected on the control plate (30, 50) by: - closing the flow of air from the distribution chamber (20) to the first (10a) and second (10b) ) in the second mode, opening the air flow from the manifold (20) to the first part nozzle chamber (10a) but keeping the second part nozzle chamber (10b) and the auxiliary air chamber (11) closed, - in the third mode opening the air flow from the manifold (20) to the first (10a) and the second (10b) partial nozzle chamber, but keeping the auxiliary air chamber (11) closed, - in the fourth mode the air flow from the distribution chamber (20) is opened to the first (10a) and second (10b) partial nozzle chamber and auxiliary air chamber (11); passage from the distribution chamber (20) to the first (10a) and a second (10b) partial nozzle chamber and opening the flow of air to the auxiliary air chamber (11). A method in an supply air device comprising: - a distribution chamber (20), - a nozzle chamber (10) having nozzles (15, 15a, 15b) or a nozzle slot, - an auxiliary air chamber (11), - at least one mixing chamber (13, 13a, 13b). ), and - at least one heat exchanger (12, 12a, 12b), the method for supplying fresh air flow (L1) from the distribution chamber (20): - to a nozzle chamber (10) from which fresh air flow (L1) is further supplied to the nozzles (15, 15a, 15b) or through a nozzle slot in said at least one mixing chamber (13, 13a, 13b), wherein a fresh air flow (L1) induces a recirculated air stream (L2) to flow from the condition to be vented through said at least one heat exchanger (12, 12a, 12b) to said at least one mixing chamber (13, 13a, 13b) from which the combined airflow (LA, LB) formed from the fresh air flow (L1) and the recirculated air flow (L2) is led to a room to be ventilated, and - an auxiliary air chamber (11) from which characterized by: - dividing the nozzle chamber (10) into at least two partial nozzle chambers (10a, 10b), - opening and closing the connection from the distribution chamber (20) to the first partial nozzle chamber (10a) and / or to the second partial nozzle chamber (10b); / or in the auxiliary air chamber (11) with one and the same control member (30, 50) disposed between the distribution chamber (20) and the first nozzle chamber (10a), the second nozzle chamber (10b) and the auxiliary air chamber (11). Method according to claim 5, characterized in that: - forming a surface of the first part nozzle chamber (10a), the second part nozzle chamber (10b) and the auxiliary air chamber (11) facing the inlet opening (1a, 2a, 3a) against the distribution chamber (20), - forming an adjusting member (30, 50) from an adjusting plate (30, 50) having apertures (Ib, 2b, 3b), whereby the desired connection from the distribution chamber (20) to the first part nozzle chamber (10a) can be opened and closed. / or a second part nozzle chamber (10b) and / or auxiliary air chamber (11). Method according to Claim 6, characterized in that the adjusting plate (30, 50) is moved by the actuator (40). A method according to claim 6 or 7, characterized by adjusting the supply air device on the control plate (30, 50) between the five modes of operation such that: - in the first mode the flow of air from the manifold (20) to the first (10a) and second (10b) fully open to the auxiliary air chamber (20), - in the second mode of operation open the flow of air from the manifold (20) to the first part nozzle chamber (10a) but keep the second part nozzle chamber (10b) and auxiliary air chamber (11) closed; and the second (10b) partial nozzle chamber, but keeping the auxiliary air chamber (11) closed, - in the fourth mode, opening the air flow from the manifold (20) to the first (10a) and second (10b) partial nozzle chamber and auxiliary air chamber (H); 20) the first (10a) and the second (10a) 10b) into the partial nozzle chamber and opening the flow of air to the auxiliary air chamber (11).