EP2715241A1

EP2715241A1 - Apparatus for mixing a first stream and a second stream of a flow medium

Info

Publication number: EP2715241A1
Application number: EP12725656.8A
Authority: EP
Inventors: Rainer Hartig; Dierk SCHRÖDER
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2011-05-25
Filing date: 2012-05-18
Publication date: 2014-04-09
Also published as: US20150129040A1; DE102011076456A1; WO2012159999A1

Abstract

The invention proceeds from an apparatus (10a, 10b) for mixing a first stream (12a, 12b) of a flow medium (14a, 14b) and a second stream (16a, 16b) of the flow medium (14a, 14b), wherein a temperature (T1a, T1b) of the first stream (12a, 12b) differs from a temperature (T2a, T2b) of the second stream (16a, 16b), and having at least one mixing apparatus (18a, 18b). It is proposed that the mixing apparatus (18a, 18b) be designed as a blade-free fan (20a, 20b) which has at least one opening (22a, 22b) and a Coanda surface (24a, 24b) arranged in the region of the at least one opening (22a, 22b), wherein the first stream (12a, 12b) exits from the at least one opening (22a, 22b) and can be directed by the Coanda surface (24a, 24b), wherein the second stream (16a, 16b) flows in the region of the at least one opening (22a, 22b), and wherein the first stream (12a, 12b), following its exit from the at least one opening (22a, 22b), can be mixed with the second stream (16a, 16b).

Description

description

Apparatus for mixing a first and a second media stream of a flow medium

The invention relates to an apparatus for mixing a first and a second media stream of a flow medium, wherein a temperature of the first media stream is different from a temperature of the second media stream, with at least one mixing device.

Different types of devices for mixing two media streams are known. For example, an adjustable flap is used to set a mixing ratio. Depending on their positioning, for example, a higher proportion of the colder media stream can be fed to a total media stream, which leads to cooling.

From the prior art known air conditioning systems for facilities with several rooms to be tempered lead cooled air to each room. The temperature of this air is usually below the needs of the occupants. Accordingly, the temperature for each room must be individually readjusted by Nachheizregister.

It is an object of the present invention to provide an apparatus and a method which advantageously adjusts a mixing ratio of different temperature media streams of a flow medium.

This object is achieved with a Vorrich ^¬ tion with the features of claim 1 and a method having the features of claim 13.

Furthermore, the invention is based on the object to provide a climate system and a method for operating an air conditioning system, in which a reheating of a room can be omitted. This object is achieved with a Klimasys ^¬ system with the features of claim 14 and a method having the features of claim 15. The invention is based on a device of the type mentioned. It is proposed that the mixing device is designed as a fanless fan which has at least one opening and a Coanda surface arranged in the region of the at least one opening, the first medium flow emerging from the at least one opening and being steerable by the Coanda surface wherein the second media stream flows in the region of the at least one opening, and wherein the first media stream after its exit from the at least one opening is miscible with the second media stream.

As a result of the configuration according to the invention, energy-efficient and uniform air-conditioning, for example of a room, can be carried out in a structurally simple manner. In addition, it is possible to dispense with large-volume structures, such as after-heating units outside the room, as are customary in the prior art. Consequently, a space-saving arrangement can be provided. Furthermore, the embodiment according to the invention offers a higher power density compared to arrangements of the prior art. Also, such a device is quiet.

A device according to the invention represents here in particular a part of a climate system, such as an air conditioning system. Such an air conditioning system can be advantageously used in arrangements in which several independent compartments or rooms to be supplied by a central air conditioning unit. This is the case, for example, in office buildings, hotels, ships or similar facilities. In this case, a desired parameter, such as a temperature, a humidity or any other parameter deemed appropriate by the person skilled in the art, for each individual compartment or for each individual room may be provided by a mixing device arranged in each case in the area of the compartment or room. be set separately. This saves space and components. In addition, generally valid settings and manipulated variables can be set at low cost on the components of the central air conditioning unit.

In this context, a mixing device is a device which, by influencing at least one state parameter of a medium flow, such as a temperature, a velocity, a pressure, a humidity and / or any other state parameter considered by the person skilled in the art to be conceivable and useful mixes another media stream. A mixing device is in particular a local mixing device. A temperature difference of the temperatures of the first and the second media stream are to be selected as a function of the ratio of the size of the two media streams. Advantageous for inhabited by people rooms, the resulting mixing temperature is to be chosen so that the requirements of well-being and medical aspects is taken into account. For other rooms, the respective mixing temperature has to be selected for use.

A blower is to be understood here as a device which accelerates and optionally compresses the flow medium, such as a liquid, a gas and, in particular, air. In this case, the flow medium of the first and of the second medium flow may be the same flow medium or may be different flow media.

Preferably, the fan is formed without a vane, wherein without wings means that a flow of media of the flow medium, which is discharged or discharged, without the help of wings, rotor blades or a rotating component takes place. Thus, the part of the fan from which the flow of the flow medium exits, such as a distributor ring or an opening on it, has no vanes, rotor blades or rotating components. By this wingless configuration may flutter and / or an unsteady leakage of the media flow of the flow medium when flowing out of the wingless fan be prevented. It occurs as a quiet flow of media flow medium or air flow from the fan. In addition, there is less pollution in an environment of the fanless fan due to the absence of a large rotating fan than with a prior art fan apparatus. In addition, an accident hazard is completely prevented by, for example, touching rotating components. Also, there is a reduction of noise, since no large volume of the flow medium is moved.

Regardless of the above-described and without impact on the definition of the blower as wingless, the apparatus may include a primary source for the first media stream of Strömungsme ^¬ diums. This primary source may be any apparatus deemed suitable by one skilled in the art, such as a pump

Generator, a motor, a compressor or compressor. Further, this definition of the fanless fan does not extend to components of the device that perform secondary functions, such as pitch adjustment, angular displacement or change in flow intensity.

Under an opening to be understood here, for example, a hole or a slot. In principle, several holes or slots can be provided here. The Coanda

Surface can be arranged at any conceivable location in the region of the opening, but preferably directly at the opening.

In this context, a Coanda surface is understood to mean a surface in which a flow medium emerging from an opening and following a surface shows the Coanda effect. Here, the flow of the flow medium tends to "run along" a convex surface rather than peeling off and moving in the original direction of motion. "The Coanda effect is a well known and proven entrainment effect by directing a primary media flow over a Coanda surface In this context, the term steerable also refers to tax and / or controllably understood. A description of the features of a Coanda surface as well as the effect of media flow on the Coanda surface can be found in scientific publications such as in Reba, Scientific American, Issue 214, June 1966, pages 84-92.

By the phrase "that the second medium flow flows in the region of the at least one opening" is to be understood here that the flow medium of the second medium flow is in the region or around the at least one opening and in particular that the second medium flow at the at least one The outlet of the first media stream from the at least one opening preferably takes place directed and in the direction of a compartment or room to be tempered and is blown out, for example, for cooling thereof In addition, in this context, "mixable" is understood to mean that the first and the second media stream can combine to form a single overall media stream.

It is also proposed that in a normal operating mode of the mixing device, the temperature of the second medium flow, which flows in the region of the at least one opening, is higher than the temperature of the first medium flow, which emerges from the at least one opening. In this case, a normal operation and / or a temperature control operation of the device should be understood under a normal operating mode. A temperature difference of the temperatures of the first and the second media stream are to be selected as a function of the ratio of the size of the two media streams. Beneficial to inhabited by humans rooms, the resulting mixing temperature should be selected so that the requirements of well-being and medical Ge ^¬ lookout points are taken into account. For other rooms, the respective mixing temperature has to be selected for use. through This temperature difference, a change of an existing temperature in the room to be tempered can be made structurally simple. In a further embodiment of the invention, it is provided that in a normal operating mode of the mixing device, a speed of the second medium flow, which flows in the region of the at least one opening, is lower than a speed of the first medium flow, which emerges from the at least one opening. Here, the speed of the first medium flow, for example, 2 to 10 meters per second (m / s) and the speed of the second ^¬ th media flow is 10% to 90% of the speed of the first media stream. Due to different speeds of the two media streams, they can be effectively mixed by a entrainment effect of the second media stream through the first media stream.

Furthermore, it is advantageous if in a normal operating mode of the mixing device, a pressure of the second medium flow, which flows in the region of the at least one opening, is lower than a pressure of the first medium flow, which emerges from the at least one opening. A pressure of the first medium flow is for example 0.5 to 5 bar and the pressure of the second fluid flow is 10% to 90% of the pressure of the first medium flow. By means of the pressure difference, the entrainment and thus the mixing can be implemented constructively simple. Furthermore, it is proposed that the fanless fan has at least one distributor channel for at least the first medium flow of the flow medium. In this context, a distribution channel is to be understood as meaning a structure which encloses the medium flow of the flow medium and / or predetermines a flow direction of the medium flow. Advantageously, the distribution channel supplies the at least one opening with flow medium. Through the realization of the divider channels, the flow medium can be structurally easily routed and fed to the opening.

The distributor channel can have any form which appears to the person skilled in the art as conceivable, such as raceway-shaped, rod-shaped, polygonal, quadrangular, oval, semicircular and, in particular, round. Advantageously, the distribution channel extends at least over a portion of the wingless fan, whereby the first medium flow of the flow medium can be sufficiently distributed over the fan. In this case, the partial region may be a polygonal region, a sector of a ring, a half of a ring or, preferably, a ring. The at least one opening is preferably adapted to the design of the distri ^¬ lerkanals and extends along its entire extension ter. In particular, the opening is designed as a slot which is concentric with the distribution channel or its ring shape.

In addition, it is proposed that the fanless fan is annular. Thus, the fanless fan can be realized with a low weight. Furthermore, the wingless fan thereby has a central recess, whereby the second medium flow can be passed unhindered past the at least one opening in the distribution channel.

Furthermore, it is advantageous to the distribution channel and the fanless fan the same shape, for. As a ring shape to give, whereby the distribution channel can be easily integrated into the wingless fan design. Thus, the distribution channel extends along an entire circumference of the fanless blower. Preferably, a wall of the distribution channel forms a basic shape of the fanless fan and / or the fan represents a wall of the distribution channel. Furthermore, it is possible to perform the fan multi-stage / -flutig. It is also possible to combine different shapes. Further, it is advantageous if the at least one opening having an opening direction which is oriented substantially paral lel to the flow direction ^¬. The opening direction thus points in the room to be tempered. The term "essentially parallel" is to be understood as meaning that a deviation of the opening direction from the flow direction at an angle of up to 30 ° is also to be considered as a parallel arrangement Preferably, however, the opening direction and the flow direction run parallel to one another alignment can be achieved in that the first media stream flow Medi ^¬ around can flow out of the opening of the unimpeded and without turbulence. Advantageously, the to be ^¬ forms at least one opening to give the wingless fan, an effect as a nozzle Thereby, the first media stream. As a result of the accelerated discharge of the first medium flow of the flow medium from the at least one opening and the interaction with the Coanda surface, a second medium flow of the flow medium flowing in the region of the opening can m are itgeris ^¬ sen. Ultimately, an enhanced many times from the mixing device emerging total media stream relative to the first media Ström of the flow medium. This gain has, for example, a factor of 15. In this case, the central recess of the fanless fan proves to be advantageous, since so the second medium flow of the flow medium flow freely and can be entrained.

The Coanda surface may have any practicable by those skilled in he stayed ^¬ orientation. In a further embodiment of the invention, however, it is provided that the Coanda surface is arranged in the flow direction of the first media stream after the at least one opening. In this case, the opening represents an exit point of the first medium flow of the flow medium from the distribution channel Opening there arranged on the distribution channel, where one of these walls ends in a con ^¬ figuration of two adjacent walls of the distribution channel. In addition, an extension surface of the opening is oriented perpendicular to the flow or opening direction, wherein the extension surface, starting from the end of the shorter wall, is oriented perpendicular to the opposite wall. With this arrangement, can flow after its exit from the aperture immediately above the Coanda-surface of the first Me ^¬ serving stream of the flow medium.

It is also proposed that the Coanda surface is symmetrical to an axis. In particular, the axis coincides together ^¬ men with an axis through a center of the circle of the wing ^¬ loose blower and the distributor channel. In addition, the axis runs coaxially with an axis of at least one feed of a medium flow, in particular of the second medium flow. By means of this arrangement, a medium flow, in particular the second medium flow, of the flow medium can flow uniformly past the wing- ^less fan.

Conveniently, the Coanda surface and the axis enclose an angle between 7 ° and 20 ° and in particular 15 °. These values have proven to be particularly useful for using the Coanda effect. With these values, a sufficient first media flow of the flow medium can be achieved via the Coanda surface, which leads to an effective travel of the second medium flow of the flow medium and thus to a maximum total media flow. Furthermore, it may be advantageous if the device has a turbomachine which generates the first medium flow and by means of which at least one state parameter of the first medium flow is adjustable. The turbomachine is the primary source described above for generating the first media stream and is preferably designed as a turbo ^¬ unit or a compressor. As described above, a temperature, a velocity, a pressure, a humidity and / or any other re understood by the skilled person for conceivable condition parameters. By means of the turbomachine, the first medium flow can be generated structurally simple and its state parameters can be easily adjusted.

The turbomachine can be located directly in the area of the mixing device, for example in the same room as the fanless fan. However, the turbomachine is preferably arranged outside the space in which the mixing device is placed. In particular, the flow ^{machine is} arranged in a region or space that is connected by at least two feeders for at least two mixing devices to the two spaces in which the mixing devices are placed. As a result, advantageously several mixing devices with the same turbomachine can be operated cost-effectively and component-saving. Furthermore, the flow ^¬ machine can be placed at a distance to the mixing device, whereby a particularly low-noise Mischvorrich ^¬ tion can be provided to an air conditioning of the room.

A preferred development is that the device has a first supply for the first media stream and a second supply for the second media stream. Here, a device is understood to be a feed, which specifies a direction and / or path of the media stream, in particular of the turbomachine to the mixing ^¬ device. Through the feeds, the flow medium can be transported purposefully.

An effective supply of the flow medium can be achieved ^¬ advantage when the fanless fan is arranged concentrically relative to at least one feed. Further, a traveling with us of the second media stream flowing through the recess in the wingless blowers, take place particularly gleichmä ^¬ ssige when the wingless the blower and / or the distributor channel, at least concentrically to the second inlet extends. In principle, however, a non-centric arrangement would also be conceivable.

The first feeder and the second feeder may be positioned in any arrangement that is considered practicable by those skilled in the art, such as perpendicular, parallel or oblique. Advantageously, the first supply and the second supply are formed as a double-walled tube. The first and the second feed are preferably arranged concentrically to one another. In this case, the first feed is particularly preferably arranged in a circumferential direction about the second feed. Basically, an unzentrische arrangement would be conceivable. By means of the design as a double-walled pipe, the feeders component and space-saving can be realized.

It may be advantageous if an operating parameter of the mixing device and / or the fanless fan is changeable. In this case, an operating parameter is to be understood as meaning, in particular, a shape, size, position, orientation and / or any other operating parameter which the person skilled in the art considers changeable.

A further embodiment of the invention provides that the fanless fan is arranged axially displaceable relative to a feed, which supplies the first medium flow and / or the second medium flow to the mixing device. In principle, it would also be possible to change an orientation of the fanless fan relative to at least one of the feeders by tilting or by an angle adjustment. The change in position, for example, by means of a

Servo motor done. By the possibility of movement of the fanless fan, a state parameter of a media flow can be easily changed structurally. This results in an alternative and / or additional actuating means to the turbomachine. Furthermore, the invention relates to a method for mixing a first medium flow of a flow medium and of a second media stream of the flow medium, wherein an Tempe ^¬ temperature of the first media stream is different from a temperature-temperature of the second media stream, using an apparatus according to the invention.

It is proposed that the first medium flow is blown out of at least one opening of a mixing device and arranged by one in the region of the at least one opening

Coanda surface is directed, and wherein the first media stream is mixed after its exit from the at least one opening with the second media stream. The embodiment according to the invention makes it possible to carry out a rapid and uniform air conditioning of a room. Furthermore, higher power density can be achieved over prior art methods.

In addition, the invention is based on an above-mentioned air conditioning system and a method for operating the same.

It is proposed that a parameter is selected in a setting unit, a function of this parameter is a state parameter of a first media stream is affected and / or an operating parameter of a mixing device is influenced, so that after an exit of the first Me ^¬ service roms from at least one opening of a mixing device , a steering and / or controlling and / or regulating the first media stream by means of the mixing device and a see the first media stream with a second media stream of the parameters has been set. The embodiment according to the invention makes it possible to carry out a rapidly adaptable and uniform air conditioning of a room. In this context, a setting unit in particular represents a control panel, such as a keypad or a touchpad, by means of which a desired parameter, in particular by an operator, can be set and / or selected. In this case, a parameter is to be understood as meaning, for example, a temperature, a humidity and / or any other parameter considered useful by the person skilled in the art, which is to prevail in the area and / or space to be tempered. This represents, in particular, a comfort temperature. A state parameter of the first flow medium can here be influenced, for example, by a variable change in a diameter of the first feed. The operating parameter of the mixing device can be influenced, for example, by an axial displacement.

The invention will be explained in more detail with reference to exemplary embodiments, which are illustrated in the drawings. Show it:

1 shows an inventive air conditioning system with several devices according to the invention in an overview,

2 shows a device according to the invention of FIG 1 with a mixing device in a sectional view,

3 shows the mixing device of FIG. 2 in a frontal view,

4 is a perspective and enlarged view of a

Part of the mixing device of FIG. 2,

5 shows a block diagram for illustrating the method for operating the air conditioning system of FIG. 1 and FIG

6 shows an alternative device with a supply line with two separately formed tubes in a sectional view.

FIG. 1 shows an air conditioning system 44a, in the form of an air conditioning system, for a ship 48a, of which one is exemplary here Deck with cabins 50a is shown. The air conditioning system 44a has, per cabin 50a, a device 10a, 10a 'for mixing a first medium flow 12a of a flow medium 14a and a second medium flow 16a of the flow medium 14a, wherein a temperature Tla of the first medium flow 12a is different from a temperature T2a of the second medium flow 16a (see FIG 2). The flow medium 14a is here air. In addition, the air conditioning system 44a and the device 10a, 10a 'have a turbomachine 36a in the form of a compressor, which supplies the cabins 50a centrally with the first medium flow 12a of the flow medium 14a (shown by way of example for some cabins 50a). Here, a central line 52a directs the first medium flow 12a from a space in which the turbomachine 36a is arranged to the cabins 50a. At the cabins 50a, the central line 52a forks, so that each cabin 50a, a first feeder 38a, the first media stream 12a of the cabin 50a supplies.

2 shows a section through a region of a cabin wall 54a, in which a part of the device 10a is arranged. The device 10a has a mixing device 18a, which is arranged at one end 56a of the first supply 38a, the end 56a facing an interior 58a of the cabin 50a. Thus, the mixing device 18a is disposed on a side of the cabin wall 54a facing the interior 58.

The mixing device 18a is designed as a fanless fan 20a. In addition, the wingless fan 20a is annular, wherein the ring 60a extends centrally about an axis 34a and defines with its shape and extension a recess 62a (see FIG. 3). Likewise centered about the axis 34a extends a wall 64a of the first feeder 38a. The first supply 38a is formed together with a second supply 40a for the second medium flow 16a as a double-walled pipe 42a. Here, the second connects

Feeder 40a an outer portion 66a of the car 50a, such as a passage of the deck, with the interior 58a of the car 50a. Thus, the second supply 40a carries flow dium 14a from outside the cabin 50a of the mixing device 18a. Accordingly, the second media stream 16a can exit through the recess 62a of the ring 60a of the vaneless blower 20a.

The wingless fan 20a is disposed axially displaceable relative to the first and second feeds 38a, 40a. As a result, an operating parameter Bla of the mixing device 18a, such as a relative position of the fanless fan 20a, for example, with an actuating element or motor, not shown here, be changed. To do this without leakage of flow medium 14a to the mixing device 18a, a seal 70a is provided between the wall 64a of the first supply 38a and an outer surface 68a of the blower 22a.

In a normal operation of the mixing device 18a, ie in the normal temperature control operation of the mixing device 18a, the temperature Tla of the second media stream 16a is higher than the temperature T2a of the first media stream 12a. Here, the temperature Tla, for example, 10 ° C and the temperature T2a 22 ° C. In addition, a speed via the second media stream 16a is lower than a speed v2a of the first media stream 12a. The speed via is for example 2 m / s and the speed v2a 1 m / s. Furthermore, a pressure pla of the second medium flow 16a is lower than a pressure p2a of the first medium flow 12a. For example, the pressure pla 2 bar and the pressure p2a 1 bar. Basically, the mixing device 18a also operates at the same speeds and pressures of the first and second media streams 12a, 16a.

The wingless blower 20a has a distribution channel 26a for the first medium flow 12a. The distribution channel 26a is also annular and thus extends in a circumferential direction 72a over an entire circumference 74a of the wingless blower 20a. The fan 20a forms a wall 76a of the distribution channel 26a. In the illustrated embodiment For example, the bladeless fan 20a and the ring 60a have an outer diameter 78a of 200 mm (see FIG. A depth 80a of the blower 22a coaxial with the axis 34a is 30mm, with the manifold 26a narrower about the extent of the wall 76a.

The first medium flow 12a of the flow medium 14a enters the distribution channel in a flow direction 30a through a recess 82a which is arranged on a side 84a of the blower 22a facing in the direction of the first supply 38a

26a. Furthermore, the wingless fan 20a and its distribution channel 26a has an opening 22a, wherein the opening 22a is supplied from the distribution channel 26a with flow medium 14a. The opening 22a has an opening direction 28a which is aligned parallel to the axis 34a and the flow direction 30a of the first medium flow 12a. Further, the opening 22a of an annular

Slot formed, which extends along the ring 60a of the vane-less blower 20a.

As can be seen in FIG. 4, the wall 76a of the vaneless blower 20a has, in the region of the opening 22a, an inner wall region 86a and an outer wall region 88a, which are arranged opposite one another in a folded arrangement. A notional extension surface of the opening 22a extends, starting from an end 90a of the inner wall region 86a, perpendicular to the opposite outer wall region 88a and perpendicular to the flow direction 30a or opening direction 28a. An extension of the opening 22a along the extension area from the end 90a to the opposite outer wall area 88a is between 1 mm and 5 mm wide, preferably 1.3 mm. In the flow direction 30a in front of the opening 22a, a constriction area 92a tapering towards the opening 22a is arranged, whereby the opening 22a is designed to give the wingless fan 20a an effect as a nozzle 32a.

In the region of the opening 22a and in the flow direction 30a of the first media flow 12a after the opening 22a, a Coanda Surface 24a arranged. The Coanda surface 24a extends symmet ^¬ driven to the axis 34a. Further, the Coanda surface 24a and the axis 34a enclose an angle of 15 °. In the flow direction 30a after the Coanda surface 24a, a guide surface 94a is arranged, which extends approximately over two-thirds of the depth 80a of the blower 20a. The guide surface 94a and the general configuration of the wingless blower 20a are adapted to a shape of a supporting surface. After exiting the opening 22a, the first media stream 12a of the flow medium 14a is directed by the Coanda surface 24a and mixes with the second media stream 16a, which flows through the recess 62a of the ring 60a in the region of the opening 22a. The guide surface 94a in this case assists the directed outflow of the first medium flow 12a. Thus, the mixed media streams 12a, 16a exit toward the interior 58a of the cabin 50a (see FIG.

The mode of operation of the mixing device 18a is described in more detail below with reference to FIGS. 2 to 4. The turbomachine 36a generates the first medium flow 12a, which is supplied by means of the first supply 38a to the mixing device 18a and / or to the distribution channel 26a of the blower 20a through the recess 82a. The first medium flow 12a of the flow medium 14a is narrowed before it exits the opening 22a first in the constriction area 92a and then at the opening 22a.

The exit of the first medium flow 12a from the opening 22a generates a negative pressure at the recess 82a and leads to an additional suction of flow medium 14a through the recess 82a into the mixing device 18a. The flow of the first media stream 12a via the Coanda surface 24a and the guide surface 94a amplifies the first media stream 12a of the flow medium 14a by means of the Coanda effect. The second medium flow 16a of the flow medium 14a is also influenced.

This is or flows in the region of the opening 22a. Due to the immediate vicinity of the opening 22a we the second, z. B. warm media stream 16a from the first, z. Cold media ström 12a entrained, whereby a reheating of the cabin 50a may be omitted, for example by a Nachheizregister. As a result of the entrainment, the second media stream 16a flows through the recess 62a, a portion of which can flow over the guide surface 94a, and merges with the first media stream 12a to form a total stream 96a of the flow medium 14a. The total flow 96a now flows in the flow direction 30a into the interior 58a of the cabin 50a in order to temper it, in particular to cool it.

Higher speeds can be achieved by reducing the angle which is included between the Coanda surface and the axis ^¬ . A smaller angle will cause the total current to flow in a more focused and direct manner. Such a total flow is expelled at a higher velocity and a reduced flow volume rate. Conversely, a larger flow volume rate can be achieved by increasing the angle trapped between the Coanda surface and the axis. Here, the speed of the total flow is reduced, but the flow volume rate is increased.

The dimensions and performance of the device 10a depend, for example, on the type of turbomachine used and the volume of the space to be tempered.

An operation of the air conditioning system 44a will now be described with reference to the diagram of FIG. An operator 98a selects a setting unit 46a, which is for example formed by a touch pad, a parameter T _so na from I. This parameter T _to a, for example, represents a comfortable temperature for the operator 98a in the cabin 50a. This parameter _T is na now to an actuator 100a or more actuators 100a forwarded II, III, depending on the selected ^¬ selected parameter T _sl ia affect the state parameters Tla, pla, via the first media stream 12a IV. For this purpose are for each temperature T _so na tables of value state parameters Tla, via, pla deposited. Alternatively or additionally, an actuator 100a and an operating parameter Bla the mixing ^¬ device 18a affect V. By this influence, the first media stream 12a and / or the position of the mixing device 18a is adjusted or changed so that after the exit of the first media stream 12a from the Opening 22a of the mixing device 18a, the steering of the first media stream 12a by means of the Coanda surface 24a of the mixing device 12a and the mixing of the first media stream 12a with the second media stream 16a of the parameter Ti _st a or the Wohlfühltempera ^¬ tur in the cabin 50a is set VI.

The desired parameter T _so na can be selected for each cabin 50a sepa ^¬ rat and is set by the devices 10a, 10a 'and the respective mixing device 18a individually for each cabin 50a.

FIG. 6 shows an alternative embodiment of the device 10a. Essentially, the same components, features and functions are always numbered the same. In order to distinguish the exemplary embodiments, however, the letters a and b are added to the reference symbols of the ^exemplary embodiments. The following description is essentially limited to the differences from the exemplary embodiment in FIGS. 1 to 5, it being possible to refer to the description of the exemplary embodiment in FIGS. 1 to 5 with regard to components, features and functions remaining the same. The embodiment of Figure 6 differs from that of Figures 1 to 5 in that a device having a first supply 38b of a first media stream 12b a Strömungsme ^¬ diums 14b and a second feed 40a of a second media ^¬ stream 16b 10b, these two separately formed tubes 102b, 104b are designed. The tubes 102b, 104b are parallel to an axis 34b. The first tube 102b of the first feeder 38b terminates in a sleeve 106b which terminates in the direction of the second tube 104b is and is penetrated by the second tube 104b. Further, in the sleeve 106b on a side opposite the second tube 104b side, a mixing device 18b is introduced via a seal 70b axially displaceable. The first supply 38b supplies the first medium flow 12b through a recess 82b to a distribution channel 26b of the mixing device 18b. This is designed as a fanless fan 20b having an opening 22b and a Coanda surface 24b arranged in the region of the opening 22b. After emerging from the opening 22b and its steering, the first media stream 12b mixes with the second media stream 16b by means of the Coanda surface 24b, which stream flows through the second feed 40b in the region of the opening 22b after a supply line. A total flow 96b of the first and second media streams 12b, 16b is blown in the flow direction 30b or in an opening direction 28b of the opening 22b into an interior 58b of a cabin 50b.

Claims

claims

1. Device (10a, 10b) for mixing a first medium flow (12a, 12b) of a flow medium (14a, 14b) and a second medium flow (16a, 16b) of the flow medium (14a, 14b), wherein a temperature (Tla, Tlb) the first media stream ^¬ (12a, 12b) different from a temperature (T2a, T2b) of the second media stream (16a, 16b), and with at least one mixing device (18a, 18b),

characterized in that the mixing device (18a, 18b) is designed as a fanless fan (20a, 20b), wel ^¬ ches at least one opening (22a, 22b) and in the region of the at least one opening (22a, 22b) arranged Coanda Surface (24a, 24b), wherein the first medium flow (12a, 12b) from the at least one opening (22a, 22b) emerges and from the Coanda surface (24a, 24b) is steerable, wherein the second medium flow (16a, 16b ) in the region of the at least one opening (22a, 22b), and wherein the first medium flow (12a, 12b) after its exit from the at least one opening (22a, 22b) is miscible with the second medium flow (16a, 16b).

2. Apparatus according to claim 1,

characterized in that in a proper working operation of the mixing device (18a, 18b) the temperature

(Tla, Tlb) of the second medium flow (16a, 16b), which in the region of the at least one opening (22a, 22b) flows, is higher than the temperature (T2a, T2b) of the first medium flow (12a, 12b), which from the at least one opening (22a, 22b) emerges.

3. Apparatus according to claim 1 or 2,

characterized in that in a proper working operation of the mixing device (18a, 18b) is a speed (via, vlb) of the second media stream (16a, 16b), which in the region of the at least one opening (22a, 22b) flows, is lower than a speed (v2a, v2b) of the first media stream (12a, 12b) emerging from the at least one opening (22a, 22b).

4. Device according to one of the preceding claims, characterized in that in a normal operation of the mixing device (18a, 18b), a pressure (pla, plb) of the second media stream (16a, 16b), which in the region of the at least one opening (22a, 22b) is lower than a pressure (p2a, p2b) of the first medium flow (12a, 12b) emerging from the at least one orifice (22a, 22b).

5. Device according to one of the preceding claims, characterized in that the wingless fan (20a, 20b) at least one distribution channel (26a, 26b) for at least the first media stream (12a, 12b), wherein the distribution channel (26a, 26b) the at least one opening (22a, 22b) supplied with flow medium (14a, 14b).

6. Device according to one of the preceding claims, characterized in that the at least one opening (22a, 22b) has an opening direction (28a, 28b) which is substantially parallel to a flow direction (30a, 30b) of the first media stream (12a, 12b ) and / or that the at least one opening (22a, 22b) is adapted to give the bladeless fan (20a, 20b) an effect as a nozzle (32a, 32b).

7. Device according to one of the preceding claims, characterized in that the Coanda surface (24a, 24b) in the flow direction (30a, 30b) of the first media stream (12a, 12b) after the at least one opening (22a, 22b) is arranged.

8. Device according to one of the preceding claims, characterized in that the Coanda surface (24a, 24b) is symmetrical to an axis (34a, 34b) and / or that the Coanda surface (24a, 24b) and the axis (34a , 34b) one Include angles between 7 ° and 20 ° and in particular 15 °.

9. Device according to one of the preceding claims, characterized in that the wingless fan (20a, 20b) is annular.

10. Device according to one of the preceding claims, characterized by a turbomachine (36a, 36b) which generates the first media stream (12a, 12b) and / or by means of the at least one state parameter (Tla, Tlb; pla, plb; via, vlb) of the first media stream (12a, 12b) is adjustable.

11. Device according to one of the preceding claims, characterized by a first feed (38 a) for the first medium flow (12 a) and a second feed (40 a) for the second medium flow (16 a), wherein the first feed (38 a) and the second feed (40a) are formed as a double-walled tube (42a).

12. Device according to one of the preceding claims, characterized in that the wingless blower (20a, 20b) relative to a feed (38a, 38b, 40a, 40b), the first media stream (12a, 12b) and / or the second media - ström (16a, 16b) of the mixing device (18a, 18b) feeds, is arranged axially displaceable.

13. A method for mixing a first media stream (12a, 12b) of a flow medium (14a, 14b) and a second media stream (16a, 16b) of the flow medium (14a, 14b), wherein a temperature (Tla, Tlb) of the first media stream (12a, 12b) is different from a temperature (T2a, T2b) of the second media stream (16a, 16b), using a device (10a, 10b) according to any one of claims 1 to 12,

characterized in that the first medium flow (12a, 12b) is blown out of at least one opening (22a, 22b) of a mixing device (18a, 18b) and is surrounded by a Coanda surface (24a, 24a, 22b) arranged in the region of the at least one opening (22a, 22b). 24b), and wherein the first medium flow (12a, 12b) after leaving the at least one opening (22a,

22b) is mixed with the second media stream (16a, 16b).

14. Air conditioning system (44a, 44b) with at least two devices (10a, 10b, 10a ', 10b') according to at least one of claims 1 to 12.

15. A method for operating an air conditioning system (44a, 44b) according to claim 14 with at least two devices (10a, 10b, 10a ', 10b') according to one of claims 1 to 12,

characterized in that a parameter (T _so na, T _so nb) is selected at a setting unit (46a, 46b), depending on this parameter (T _so na, T _so nb) a state parameter (Tla, Tlb; pla , PLB; via, VLB) of a first media ^¬ stream (12a, 12b) is influenced and / or an operating Para ^¬ meter (Bla, Blb) a mixing device (18a, 18b) is influenced, so that (after a discharge of the first media stream 12a , 12b) from at least one opening (22a, 22b) of a mixing device (18a, 18b), directing the first media stream (12a, 12b) by means of the mixing device (12a, 12b) and mixing the first media stream (12a, 12b ) with a second medium flow (16a, 16b) of the parameters (Ti _st a, T _is b) has been set.