WO2013130004A1

WO2013130004A1 - Ventilation device for server rack and a method for cooling server racks

Info

Publication number: WO2013130004A1
Application number: PCT/SE2013/050183
Authority: WO
Inventors: Kristian THORIN; Jon KARLUNG
Original assignee: Mdc Stockholm Ab
Priority date: 2012-02-29
Filing date: 2013-02-28
Publication date: 2013-09-06
Also published as: SE1250182A1

Abstract

A ventilation device (1) for server rack (4) comprising at least one intermediate wall (10) arranged between a first internal space (11) of a first server rack (4) and a second internal space (11) in a second server rack (4), characterized in that the intermediate wall (10) is adjacent to the first internal space (11) of the first server rack (4) and the second internal space (11) of the second server rack (4), the intermediate wall (10) further comprises an internal cavity (46), a first wall entrance device (15) for inlet of cooling air (6) to the internal cavity (46) of the intermediate wall (10), a second wall entrance device (19) for outlet of the cooling air (6) from the internal cavity (46) of the intermediate wall to at least one of the first and second internal cavities (11) of the first and the second server rack (4), respectively. The invention also concerns a method for cooling of server racks.

Description

VENTILATION DEVICE FOR SERVER RACK AND A METHOD FOR COOLING SERVER RACKS

Technical field

[0001] The present invention relates generally to a ventilation device for server racks.

Background art

[0002] In prior art it is known to refrigerate so called server racks comprising rack servers which further are arranged in rows, through usage of ventilation systems with cooling air. The server racks are generally placed in so called server rooms, i.e collections of servers for management, storage, and operation of IT- systems of companies or private individuals. Such solution can have a central ventilation system that sucks/blows cooling air between separate rows of server racks, for example in cold aisles between the rows of server racks, in which perforations are arranged in the server cabinets' doors, which enables for the cooling air to make a way into and refrigerate the server racks.

[0003] For example, one drawback with the known technology is that the cooling air isn't directly directed towards the server rack that it supposed to be refrigerated which thereby decreases the refrigerating effect of the system alternatively makes the system more energy consuming in order to reach a certain given refrigerating effect of the system, i.e. that the server temperatures shall be maintained at a certain level that should not be exceeded. The above mentioned perforations in the doors of the server cabinets allows for noise from the servers to reach out, which impair the working environment for operators or IT support technicians working in the server room.

[0004] Another drawback with the prior art is that previously known server cabinets or rack cabinets which comprises server racks are arranged in rows in separate units, which each consists of at least four walls and roof. As well usage of material, space demands during installation as cost for logistics and storage of the cabinet's parts and the time duration of putting the server cabinets together are hence high.

RECORD COPY-TRANSLATION

( uie 12,4) [0005] Another drawback with the known technology is the extra material that is needed and the associated cost to build the so called cold aisles between the rows of server racks which requires tight seals between the rows of server racks and other spaces such as the so called warm aisles in which heated exhaust air is carried from the server racks.

[0006] A further drawback is that the known ventilation system is not adapted after the cooling needs of the single server rack which makes the total energy consumption for refrigeration of those server racks high.

Summary of invention

[0007] An object of the present invention is to improve the refrigerating effect for a ventilation device adapted to refrigerate server racks.

[0008] Another object of the present invention is to decrease the energy consumption for a ventilation device adapted to refrigerate server racks.

[0009] Another object of the present invention is to decrease the noise from a ventilation device adapted to refrigerate server racks.

[0010] Another object of the present invention is to decrease the cost and time consumption for producing and installation of a ventilation device for refrigerating of server racks.

[0011] Another object of the present invention is to achieve space savings for server racks.

[0012] At least some of the above mentioned objectives are achieved through the following:

[0013] According to one embodiment a ventilation device for server racks is shown comprising at least an in one intermediate wall arranged between a first internal space of a first server rack and a second internal space in a second server rack, in which the intermediate wall is adjacent to the first internal space of the first server rack and the second internal space of the second server rack, the intermediate wall further comprises an internal cavity, a first wall entrance device for inlet of cooling air to the internal cavity of the intermediate wall, a second wall entrance device for outlet of the cooling air from the internal cavity of the intermediate wall to at least one of the first and second internal cavities of the first and the second server rack, respectively.

[0014] According to another embodiment it is shown that the outlet of cooling air through the second wall entrance device can be varied in order to vary the outlet to at least one of the first and second internal space of the first and the second server rack, respectively.

[0015] According to another embodiment a ventilation device is shown in which the outlet through the second wall entrance device varies through at least one adjustments mean.

[0016] According to another embodiment a ventilation device is shown in which said at least one adjustment mean comprising a third wall entrance device in which said at least one adjustment mean is arranged to be displaced in relation to the other wall entrance device.

[0017] According to another embodiment a ventilation device is shown in which said at least one adjustment mean is arranged adjacent to a fourth wall entrance device, in which the fourth wall entrance device is fixedly arranged between the cavity of the intermediate wall and the second wall entrance device with aspect on an airflow direction, in which said at least one adjustment mean is arranged to be displaced in relation to the fourth wall entrance device in which the opening with a certain opening area formed through the third wall entrance device and the fourth wall entrance device can be controlled between an open state, in which the total opening area of the opening is at a maximum, and a closed state, in which the total opening area is at a minimum.

[0018] According to another embodiment a ventilation device is shown in which second wall entrance device comprises a first and a second set of wall entrances or perforations, the ventilation device further comprises a first and a second adjustment mean with a first respectively second set of one or more wall entrances, perforations, or openings, the fourth wall entrance device comprises a first and second set of wall entrances, perforations, or openings, a branching mean is arranged to branch and at least partially prevent the airflow between on one side the first adjustment mean, the first set of the second wall entrance device and the first set of the fourth wall entrance device, forming a cavity, and on the other side the second adjustment mean, the second set of the second wall entrance device and the second set of the fourth wall entrance device, forms a cavity, in which the airflow that is allowed to flow from the internal cavity of the intermediate wall to the respectively cavities and further through the respectively first and second set of the second wall entrance device can be varied individually with means of the respective adjustment mean.

[0019] According to another embodiment a ventilation device is shown in which the third wall entrance device consist of a number of openings arranged in a vertical direction of a long and narrow adjustment mean with a certain distance from each other, in which the fourth wall entrance device consist of a number of openings to the size and reciprocal distance corresponding the openings, in which at an open state corresponds to a maximum opening area are the holes

concentrically arranged, and at the closed state corresponding to a minimal opening area are the holes displaced from each other in a radial direction, in which between those states a continuous or discrete number of states can be obtained in which a varying opening area is obtained.

[0020] According to another embodiment a ventilation device is shown in which an electrical actuator is arranged for individual control of the adjusting means, in which the ventilation device further comprises a control device for controlling of the electrical actuator, in which the control device controls the electrical actuator through pre-configured programs, or in real-time through impulses from sensors in connection to at least one of the two server racks, in which such sensors comprises any of temperature sensors, activation signals from the server rack, positioning sensors. [0021] According to another embodiment a ventilation device is shown in which the first wall entrance device extends in a first plane and the second wall entrance device extends in at least a second plane, in which the first plane is substantially perpendicular in relation to said at least one second plane, in which the normal direction of said at least one second plane extends substantially towards one of the first and second internal spaces of the first and the second server rack, respectively.

[0022] According to another embodiment a ventilation device is shown in which a second intermediate wall is arranged with a determined distance to the intermediate wall in which the distance corresponds to the width of the first server rack, in which at least one face comprises the internal cavity of the first server rack, in which the second wall entrance device is arranged on the inside of the face.

[0023] According to another embodiment a ventilation device is shown in which a third intermediate wall is arranged at a determined distance from the

intermediate wall, the distance is corresponding to the width of the second server rack, in which the intermediate wall is arranged between the first and the second server rack.

[0024] According to another embodiment a method for cooling of server racks by means of a ventilation device is shown comprising at least one intermediate wall arranged between a first internal space of the first server rack and a second internal space of a second server rack, the intermediate wall further comprises an internal cavity, a first wall entrance device for inlet of cooling air to the internal cavity of the intermediate wall, at least one second wall entrance device for outlet of the cooling air from the internal cavity of the intermediate wall to at least one of the first and second internal space of the first and the second server rack, respectively, in which an inlet air device is connected to the first wall entrance device, the method comprising the steps:

- directing of inlet air / cooling air from the inlet air device via the first wall entrance device to the internal cavity of the intermediate wall,

- directing of inlet air / cooling air from the internal cavity of the intermediate wall through the second wall entrance device to at least one of the first and second internal spaces of the first and the second server rack, respectively.

[0025] According to another embodiment a method for cooling of server racks by means of a ventilation device is shown further comprising an adjustment mean for adjustment of the outflow through the second wall entrance device, in which at least one of the first and the second server rack further comprising a temperature sensor, the method comprising the steps of:

- adjusting of the outflow through the second wall entrance device with the help of the adjustment mean based on input from the temperature sensor.

[0026] According to another embodiment a method for cooling of server racks in which cooling air is directed to an internal cavity of an intermediate wall arranged between two server racks in which the cooling air further is directed to an internal space of respectively server rack.

[0027] According to another embodiment a method in which the amount of air that is directed to an internal space of respectively server rack is adjusted with the help of an adjustment mean is shown.

[0028] Notice that the invention can be combined freely within the scope of the claims.

Brief description of drawings

[0029] The invention is now described, by way of example, with reference to the accompanying drawings, in which:

[0030] Fig. 1a shows a partially cut perspective view of a ventilation device for cooling of server racks. [0031] Figs. 2a-2b show a partially cut perspective view of a ventilation device according to Fig. 1 , with an inlet and exhaust air device.

[0032] Fig. 3a shows the face of a server rack of a ventilation device according to Fig. 1.

[0033] Fig. 3b shows the back of a server rack of a ventilation device according to Fig. 1.

[0034] Fig. 4a shows an intermediate wall of a server rack of a ventilation device according to Fig. 1.

[0035] Fig. 4b shows an exploded diagram of an intermediate wall according to Fig. 4a of a ventilation device according to Fig. 1.

[0036] Fig. 5a shows an exploded diagram of the end of an intermediate wall of a ventilation device according to Fig. 1.

[0037] Fig. 5b shows a sectional view of the end of an intermediate wall according to Fig. 5a of a ventilation device according to Fig. 1.

[0038] Fig. 5c shows a magnification image of adjustment means at the end of an intermediate wall according to Fig. 5a of a ventilation device according to Fig. 1.

[0039] Fig. 6 shows a server rack row of a ventilation device according to Fig. 1. Description of embodiments

[0040] In the following, a detailed description of the embodiments will be made with references to the attached drawings. It shall be noted that the drawings only serves the purpose of illustrating the embodiments and shall not be deemed limiting to the claim scope. Direction references shall be seen as directional references in the drawings.

[0041] Fig. 1 shows a combined perspective and sectional view, i.e. a partly cut perspective view of a ventilation device 1 for cooling of server racks 4, in which the ventilation device 1 is placed in and in connection to a space 2 for servers such as web or server rooms, in which the servers are adapted to handle storage and operations of companies' or private individuals' IT-system/environment/data. Such a server room can further for example consist of mobile units such as containers or container units 2a which are modular for rapid intersection or docking in a variable number of container units 2 after requested requirements and needs of size of the premises. In Fig. 1 an embodiment is shown in which two container units 2a are intersected along respectively container unit's side and long side. The container units comprises a hollowness or a cavity 5a limited by walls, roofs, and floors of the container units. As shown in Fig. 1 is a number of server rack rows or rack cabinet rows or server rack cabinet rows 3a, 3b, 3c, 3d, 3e arranged in a server space 2a, in which each one of the server rack rows 3a, 3b, 3c, 3d, 3e comprises a plurality of server racks 4. The server racks 4 comprise a face and a back end. The figure shows five server rack rows 3a-3e, arranged with a certain distance from each other. Each one of the server racks 4 are designed according to standard measurements for rack standards and comprises rack servers (not shown) arranged in units on top of each other in the server racks. The server rack rows 3a and 3b, as well as 3c and 3d have respectively back end turned towards each other, in which the distance in-between creates a so called warm aisle 8. A corresponding warm aisle 8 is also formed between the back end of row 33 and one of the walls of the space 2.

[0042] Fig. 2 shows a perspective and sectional view, i.e. a partly cut perspective view of a ventilation device 1 in which a space or container unit 2b is arranged above the container units 2a, through intersection or so called docking. In one embodiment, shown in Fig. 2, has a base side of the container unit 2b been intersected with the top side of a container unit 2a. The container unit 2b comprises a hollowness or a cavity 5b in which further inlet air fan systems or an inlet air fan device 48, and/or an exhaust air fan or an exhaust air fan device 49 is arranged to continuously control inlet air and/or exhaust air for cooling of the server racks 4 arranged in the container units 2a. The cavities 5a and 5b of the container units 2a respectively 2b are adapted to be in connection with each other through air flow aisles such as inlet air wall entrances 47 and exhaust air wall entrances 3. Inlet air or cooling air 6 is sucked in from the surroundings with help of an inlet air fan 48 in a first inlet air chamber 5btl in the cavity 5b through a bag filter 28a, an inlet air refrigerator 28b and an inlet air throttle 28c. The inlet air throttle 28c can be in an open or closed state and has a continuous or discrete number of partially open states in-between and can in on embodiment consist of a so called louver. The filter 28 is adapted to clean the inlet air 6 from impurities such as particles of different sizes. A filter 28 can for example consist of a micro filter. The inlet air refrigerator 28b is connected to a refrigerating machine in which in one embodiment is arranged in an exhaust air chamber 5bfl. The inlet air 6 is pushed towards the cavity 5a in the container 2a through the inlet air wall entrance 47. Said inlet air 6 pushed as shown down via ventilation pipes 32, ventilation pipe connections 40, and wall entrances devices 15 (shown in Fig. 3-4), between respectively server rack 4. Exhaust air 7, i.e. of the server racks 4 heated cooling air, or warm air 7 is sucked out from the warm aisles 8 via the exhaust air channels 33 further in to an exhaust air chamber 5bfl in the cavity 5b of the container 2b with the help of an exhaust air fan 49. In one embodiment is the exhaust air 7 carried further out from the space/container 2b to the surroundings. In an embodiment is an exhaust air throttle (not shown) arranged to control the outflow of exhaust air 7 to the surroundings. In another embodiment, or at another temperature and another operation state such as for example a relatively lower measured temperature measured in the exhaust air channel 33, can the exhaust air 7 be carried in through a re-circulation throttle 41 arranged between the inlet air chamber and the exhaust air chamber 5btl, 5bfl to the inlet air chamber 5btl for recirculation, i.e. in which the inlet air 6 and the hot air are mixed before cooling of the server racks 4. The re-circulation throttle 41 with an opening 42 is further illustrated in Fig. 2b, in which the recirculation air 43 is directed from the exhaust air chamber 5bfl in a tunnel under the exhaust air chamber 5bfl, through an opening 42 to the inlet air chamber 5btl.

[0043] In one embodiment it is referred to the minimal air flow, i.e the cooling air that passes through the inlet air chamber 5btl, refrigerating the server racks 4 in the container 2a and through to the exhaust air chamber 5bfl maintained relatively high together with a high degree of re-circulation of exhaust air 7. Through a high flow will a sufficient cooling of the server racks 4 and the so called "hot-spots" be obtained despite that the temperature of the mixed inlet air 6 is relatively high. Through an increased re-circulation a sufficient refrigerating is obtained without increasing the total energy consumption of the ventilation device 1 , among other means, through a high re-circulation that significantly decreases the exhaust air fan effect. At controlling down the ventilation device 1 , transcends the controlling in one embodiment from being controlled by the flow to being controlled by the temperature. A rack 4 with low power development is thereby flushed by a relatively large volume of air with relatively high temperature which provides a slight refrigerating effect when the temperature difference is small. A rack 4 with high power development is flushed with the same volume of air and the same air temperature, but since the temperature difference between the components / air is larger, those are refrigerated in a higher degree. Since the ventilation device 1 is controlled by the temperature of the mutual exhaust air 7 the single rack 4 will not increase the establishments total refrigerating effect noticeable. Controlling of only the flow should possible result in a risk for overheating of the rack with the highest load.

[0044] The inlet flow of cooling air that for example is controlled through a specific number of revolutions of the inlet air fan controlled in one embodiment of one or more temperature sensors (not shown), however preferably three to the number, which can be arranged in or in connection to the exhaust air channels 33. Those temperature sensors are connected to controlling means (not shown) which in turn is connected to the inlet air fan. In one embodiment where a plurality of temperature sensors is used, could the highest temperature control the number of revolutions of the inlet air fan. In one state where the inlet air fan have been down controlled to a corresponding -30% of the maximum capacity is the inlet air throttle controlled towards a closed state. The re-circulation throttle can in one embodiment be controlled of the present pressure in the fan chamber that is provided through pressure sensors (not shown) in which this opens at a certain pressure. The exhaust air fan can in turn be adapted to be controlled towards a certain under pressure in the ventilation device 1 , preferably in the exhaust air chamber 5bfl, I which when a certain lower pressure is reached in the ventilation device 1 through that the inlet air throttle is closed the number of revolutions of the exhaust air fan decreases automatically.

[0045] Redundancy in the establishment can in one embodiment be achieved through that the inlet air fan respectively the exhaust air fan is adapted to be controlled based on an operation failure of the second of said fans. In the event that the inlet air fan 48 of any reason brakes down, the under pressure decreases, in which the exhaust air fan's number of revolutions are controlled up through controlling means in which a sufficient refrigeration of the server racks 4 are maintained. In the case that the exhaust air fan 49 of any reason breaks down and indicates a stop, the re-circulation throttles is closed. If necessary will then the number of revolutions of the inlet air fan 48 increase controlled by the temperature of the exhaust air 7 provided through the temperature sensors in the exhaust air channels 33.

[0046] Fig. 3a shows a perspective view of the face 9a of a server rack 4, in which according to one embedment comprises a glass door 29, preferably of semi- mirror type, arranged through hinge means to an intermediate wall 10 to be opened and closed in order to provide access to the cavity 11 or internal space 11 of the server rack. The cavity 11 , or internal space 11 of the server rack is thereby comprised by two intermediate walls 10, the face 9a, back end 9b, roof 9c and possibly a base end 9d of the server rack 4. The server rack is arranged on a floor track or a rail track 12, comprising a front track rail 12a respectively a back track rail 12b and a plurality of cross track rails 12c, attached to the floor in the container device 2a. Over respectively intermediate walls are ventilation pipe connections 40 arranged which according to one embodiment has a circular opening for connection to each ventilation pipe 32.

[0047] Fig. 3b shows the back end 9b of a server rack 4, which according to one embodiment comprises a perforated back wall 13 for outlet and ventilation of the exhaust air 7, i.e. cooling air used to refrigerate the server rack 4 and been heated. The perforated back wall 3 can in one embodiment consist of two opening and closeable back wall doors 13a, 13b provided with a handle 14 on at least one of the back wall doors 13a, 13b. A magnification image of a section of the perforated back wall 13 is shown in Fig. 3b.

[0048] Fig. 4a shows an intermediate wall 10 separate from the other parts of the server rack 4. The intermediate wall 10 extends in a first direction which at assembling is a substantially vertical direction corresponding to the height of the server rack 4 and a second direction which at assembling is a substantially horizontal direction corresponding to the depth of the server rack, in which the extension of the intermediate wall 10 in the second direction is shorter than in the first, in the cases where the server racks 4 are higher than they are deep. The intermediate wall 10 has a certain width which is narrowing in at least one of its ends in the second direction and the end in a direction adverse the second direction, in which the intermediate wall 0 is designed to comprise an internal cavity 46 between two intermediate wall surfaces 10a, 10b. The ends of the intermediate wall 10 are surrounded of a top part 0c, and a base part 10d which extends in a first plane which is perpendicular towards a second plane in which the intermediate wall surfaces 10a, 10b extends. The top part 10c and the base part 10d together with the intermediate wall surfaces 10a, 10b and a profile 20 comprises the cavity. The ends comprise a front end and a back end which corresponds to the face 9a of the server rack respectively back end 9b. The intermediate wall 10 further comprises a first wall entrance device 15 arranged in the top part 10c, which in one embodiment consist of a rectangular opening through which the intermediate walls cavity is in connection with the surroundings outside the intermediate wall 10. A frame 16 is arranged around the wall entrance device 15 for interconnection with other means, in one embodiment a ventilation pipe connection 40. The wall entrance device 15 can according to other embodiments have other geometrical shapes and/or consist of more wall entrances, and also be arranged in a base plate or in the intermediate wall surfaces 10a, 10b. Fig. 4a shows further a first set of support structures 17a, 17b, each and everyone comprising a first end 26 and a second end 27, in which the first set of support structures comprises a front support structure 17a and a back support structure 7b. The intermediate wall part 10a is designed to receive the front or back support structure 17a, 17b. [0049] The intermediate wall 10 further comprises a second wall entrance device 19 arranged in the separate profile 20 arranged at the front end. The second wall entrance device 19 comprises a first set 19a with a plurality of circular openings 21 or perforations through which the intermediate walls cavities 46 is in connection with the surroundings, for example with cavities 11 in server racks 4. The openings 21 or perforations can in other embodiments have other geometrical shapes or be more or less than the 13 that are shown in Fig. 4a. The wall entrance device 19 is arranged with openings in a vertically extending direction at assembly but can be arranged in other directions in other embodiments. The first wall entrance device 15 extends in the first plane and the second wall entrance device 19 extends in the second plane, in which the first plane is substantially perpendicular in relation to the second plane. In one embodiment the profile 20 has a key formed design through which the narrowing front end of the intermediate wall 10 is formed. In one embodiment is the first set 19a of the openings or perforations of the wall entrance device 19 arranged on a first profile surface 20a which plane has an angle in relation to the intermediate wall part 10a.

[0050] Fig. 4b shows an exploded diagram of the intermediate wall 10 comprising a second set of support structures 18a, 18b comprising a front support structure 18a and a back support structure 18b. The intermediate wall part 0b is designed to receive said front and back support structure 18a, 18b.

[0051] According to one embodiment is the first and second set of support structures 17a, 17b, 18a, 18b fixed to the intermediate wall 10 through any sort of nipple. According to another embodiment are those support structures glued to the intermediate wall 10 with the help of an adhesive. As illustrated of Fig. 4b does the wall entrance device 19 comprise a second set 19b with a plurality of openings 21 or perforations. In one embodiment is the second set 9b of openings 21 or perforation arranged on a profile surface 20b which plane has an angle in relation to the intermediate wall pat 10b. The support structures 17a, 17b, 18a, 18b are designed with a flat part and an angle part. The flat part is adapted to be fixed towards respectively compression press track 22a, 22b, 23a, 23b and the angle part has a large hole 24 extending along the support structures which are adopted to receive rack shelves or rack servers through separate or to said rack shelves or rack servers fixedly arranged fastening means through which the rack servers and rack shelves can be fastened to the support structures. The first end 26 of the support structures 17a, 17b, 18a, 18b are designed with a bayonet coupling device 25 according one embodiment. According to another embodiment are the support structures 17a, 17b, 18a, 18b fastened with some sort of fastening devices to the cross rail track 12c, the rail track 12a, 12b, or the base part 10d.

[0052] Fig. 5a shows an exploded diagram over the front narrowing end of the intermediate wall 10, which comprises a first flat and extended adjustment mean 34a and a second similar or identical flat and extending adjustment mean 34b. The adjustment mean 34a, 34b comprises a third wall entrance device 35, comprising a first set 35a respectively a second set 35b of one or more wall entrances, perforations or holes 36, in which the latter variant is shown in Fig. 5a comprising nine openings arranged in a vertical extension direction. The adjustment means 34a, 34b are adapted to fit in two narrow holes 36a, 36b in the top part 10c, said holes 36a, 36b are arranged with an angle towards each other. A fourth wall entrance device 37 is designed in an angle profile, fixedly arranged in relation to the intermediate wall 10 through a first portion of a first 38a respectively a second set 38b wall entrances, perforations, or openings 39 of the fourth wall entrance device 37 attached to respectively intermediate wall surface 10a, 10b. A second portion of respectively the first 38a and the second set 38b of the fourth wall entrance device 37, comprises wall entrances, perforations, or openings 39. In one embodiment dose those openings 39 have the same design as the holes 36 in the third wall entrance mean 35. A thin sheet formed branching mean 44 is arranged between on one side the adjustment mean 34a and the fourth wall entrance mean 37a and on the other side the adjustment mean 34b and the fourth wall entrance mean 37b. Through this branching mean 44, is the key formed profile 20 divided in to two cavities 45a, 45b.

[0053] Fig. 5b shows a cross section of the front end of the intermediate wall 10, which said end is arranged closest to the face 9a of a server rack 4 after assembling. The holes 36a, 36b are arranged in a top part 10c such that the adjustment means 34a, 34b at assembly are arranged to adjoin towards the fourth wall entrance mean which is shown in Fig. 5b. In Fig. 5b is also shown how the branching mean 44 divides the key formed profile 20 in to two cavities 45a respectively 45b. An actuator or other activation device is in one embodiment arranged to control the adjustment means 34a, 34b. In Fig.5c manually adjustable adjustment means 34a, 34b are shown which through a lock plate and a nipple is hold fixedly in one of a plurality of discrete states in the vertical direction. In another embodiment the actuator is a linear actuator, adapted to move the adjustment means 34a, 34b linear in a vertical direction. Through the adjoining arrangement of the adjustment devices 34a, 34b and their third wall entrance device 35a, 35b in relation to the fourth wall entrance devices 37a, 37b can the opening from the cavity 46 of the intermediate wall to respectively cavity 45a, 45b of the profile 20 be directed between an open state, in which the total opening area between the adjustment means 34a, 34b and the fourth wall entrance devices 37a, 37b is at a maximum, i.e. in an embodiment with similar holes 36, 39 are those openings concentrically arranged, and a closed state, in which the total opening area between the adjustment means and the fourth wall entrance device is at a minimum, i.e. the openings are displaced from each other in a radial direction. Between those states can a continuous number of positions be obtained, in which a varied opening area is obtained. The air flow that is allowed to flow from the internal cavity 46 to respectively cavities 45a, 45b of the profile 20 and further through the second wall entrance device 19 respectively the first 19a and the second set of wall entrance device, can thereby be varied individually through respectively adjustment device 34a, 34b.

[0054] In one embodiment can the single rack 4 be arranged with temperature sensors (not shown) for individual control of the air flow through the single rack 4. At a low temperature of one rack 4 are the adjustment means controlled such that the flow is decreased through only that rack 4. When everything else, at least the total air flow through the ventilation device 1 is un-changed, the air flow through the rest of the racks 4 will increase. Due to this reason the temperature sink for the mutual exhaust air temperature measured at, or in connection to, the exhaust air channel 33 will decrease, in which the number of revolutions of the inlet air fan and/or the cold air mixture through the inlet air throttle will be controlled down. Thereby can the energy consumption for refrigeration of the serer racks 4 be lowered through the individual control of the air flow of single server racks 4.

[0055] Fig. 6 shows a server rack row 3 comprising a number of server racks 4. One number of server racks 4 has been arranged at the front and back track rail 12a, 12b. At forming of a server rack row 3, i.e. at assembling of the server racks 4 are first a first intermediate wall 10 arranged for example via the bayonet coupling device 25 of the support structures 17a, 17b, 18a, 18b to the front and back track rail 12a, 12b, anywhere along those track rails, preferably at some end of those track rails. A second intermediate wall 10 is arranged after that at a given distance from the first intermediate wall 10 corresponding to substantially the width of a server rack 4. According to one embodiment are the intermediate walls 10 arranged over the cross track rails 12c, in which the bayonet coupling devices 25 are adapted to be attached to the cross track rails 12c. Those cross track rails are thereby arranged with a certain distance from each other corresponding to the width of the server racks 4. According to one embodiment can markings in the track rails 12a, 12b provide the position of where the intermediate walls shall be arranged to those to correspond to the width of a server rack 4. The size of those can also vary through varying of the size of the face 9a, glass door 29, the back end 9b through back wall 13 and the roof 9c. After two intermediate walls have been placed along the track rails 12a, 12b, is the roof arranged 9c, the face 9a, the back end 9c and the base plate 9d, and then a server rack 4 has been assembled. The modularity further comprises that the next, subsequent, server rack 4 share an intermediate wall 10 with the previous server rack 4. For assembling of a subsequent server rack 4 are therefore another intermediate wall 10 arranged with a certain given distance from the previous intermediate wall 10. After that is the same procedure repeated again, in which the face 9a, back end 9b, roof 9c, and possibly a base plate 9d of the server rack 4 are arranged. A second server rack 4 has thereby been assembled. In Fig. 6 is five server racks 4 shown assembled along the rail track 12, as well as a seventh assembled intermediate wall 10. [0056] In one embodiment when those server racks 4 are intended to be placed in container units 2a such as described for example according to Fig. 1-2 can the server racks at delivery be pre-assembled in two different container units 2a which are adapted to later be intersected together. Thereby it is utilized that at least three of the front respectively back track rails 12a1 , 12a2, 12a3, 12b1 , 12b2, 12b3 together constitute the two parallel track rails 2 after intersection of the container units 2a. In one of the container units 2a have a first front respectively back track rail been arranged 12a1 , 12b1 , on which for example and according to Fig. 6 three server racks 4 have been arranged. In the second container unit 2a have a third front respectively back track rail 12a3, 12b3 been arranged on which at least one server rack 4. After the intersection of the container units 2a, is a second front respectively back track rail 12a2, 12b2 arranged in line with the first and third front and back track rails 12a1 , 12b1 , 12a3, 12b3 to couple those together. After that are additional server racks 4 arranged along the second front and back track rail 12a2, 12b2. In one embodiment is the server rack 4, pre-assembled on the third front and back track rail 12a3, 12b3, adapted to be displaced along those track rails 12a3, 12b3 in the purpose of overcoming permissible allowance problems that can arise after intersection of the container units 2a.

[0057] The above stated disclosure of embodiments shall not be seen as limiting and it is understood that those can be freely combined within the scope of the claims. All above stated embodiments or part thereof can also be combined freely as long as the combination is not contradictory.

Claims

. A ventilation device ( ) for server rack (4) comprising at least one intermediate wall (10) arranged between a first internal space (11 ) of a first server rack (4) and a second internal space (11 ) in a second server rack (4),

characterized in that the intermediate wall (10) is adjacent to the first internal space (11 ) of the first server rack (4) and the second internal space (11 ) of the second server rack (4), the intermediate wall (10) further comprises an internal cavity (46), a first wall entrance device (15) for inlet of cooling air (6) to the internal cavity (46) of the intermediate wall (10), a second wall entrance device (19) for outlet of the cooling air (6) from the internal cavity (46) of the intermediate wall to at least one of the first and second internal cavities (11 ) of the first and the second server rack (4), respectively.

2. A ventilation device (1 ) for server rack (4) according to claim 1 ,

characterized in that the outlet of cooling air (6) through the second wall entrance device ( 9) can be varied in order to vary the outlet to at least one of the first and second internal space (11 ) of the first and the second server rack (4), respectively.

3. A ventilation device (1 ) for server rack (4) according to claim 2,

characterized in that the outlet through the second wall entrance device (19) varies through at least one adjustments mean (34a, 34b).

4. A ventilation device (1 ) for server rack (4) according to claim 3,

characterized in that said at least one adjustment mean (34a, 34b) comprising a third wall entrance device (35) in which said at least one adjustment mean (34a, 34b) is arranged to be displaced in relation to the other wall entrance device (19).

5. A ventilation device (1 ) for server rack (4) according to claim 4,

characterized in that said at least one adjustment mean (34a, 34b) is arranged adjacent to a fourth wall entrance device (37), in which the fourth wall entrance device (37) is fixedly arranged between the cavity of the intermediate wall (10) and the second wall entrance device (37) with aspect on an airflow direction, in which said at least one adjustment mean (34a, 34b) is arranged to be displaced in relation to the fourth wall entrance device (37) in which the opening with a certain opening area formed through the third wall entrance device (35) and the fourth wall entrance device (37) can be controlled between an open state, in which the total opening area of the opening is at a maximum, and a closed state, in which the total opening area is at a minimum.

6. A ventilation device (1 ) according to claim 5, characterized in that the second wall entrance device (19) comprises a first and a second set of wall entrances or perforations ( 9a, 19b), the ventilation device (1 ) further comprises a first and a second adjustment mean (34a, 34b) with a first respectively second set (35a, 35b) of one or more wall entrances, perforations, or holes (36), the fourth wall entrance device (37) comprises a first and second set (38a, 38b) of wall entrances, perforations, or openings (39), a branching mean (44) is arranged to branch and at least partially prevent the airflow between on one side the first adjustment mean (34a), the first set (19a) of the second wall entrance device (19) and the first set (38a) of the fourth wall entrance device (37), forming a cavity (45a), and on the other side the second adjustment mean (34b), the second set (19b) of the second wall entrance device (19) and the second set (38b) of the fourth wall entrance device (37), forms a cavity (45b), in which the airflow that is allowed to flow from the internal cavity (46) of the intermediate wall (10) to the respectively cavities (45a, 45b) and further through the respectively first and second set (19a, 19b) of the second wall entrance device (19) can be varied individually with means of the respective adjustment mean (34a, 34b).

7. A ventilation device (1 ) according to claim 5 or 6, characterized in that the third wall entrance device (35) consist of a number of holes (36) arranged in a vertical direction of a long and narrow adjustment mean (34a, 34b) with a certain distance from each other, in which the fourth wall entrance device (37) consist of a number of openings (39) to the size and reciprocal distance corresponding the holes (36), in which at an open state corresponds to a maximum opening area are the holes (36, 39) concentrically arranged, and at the closed state corresponding to a minimal opening area are the holes (36, 39) displaced from each other in a radial direction, in which between those states a continuous or discrete number of states can be obtained in which a varying opening area is obtained.

8. A ventilation device (1 ) according to any of the preceding claims 2-7, characterized in that an electrical actuator is arranged for individual control of the adjusting means (34a, 34b), in which the ventilation device (1 ) further comprises a control device for controlling of the electrical actuator, in which the control device controls the electrical actuator through pre-configured programs, or in real-time through impulses from sensors in connection to at least one of the two server racks (4), in which such sensors comprises any of temperature sensors, activation signals from the server rack, positioning sensors.

9. A ventilation device (1 ) according to any of the preceding claims, characterized in that the first wall entrance device (15) extends in a first plane and the second wall entrance device extends in at least a second plane, in which the first plane is substantially perpendicular in relation to said at least one second plane, in which the normal direction of said at least one second plane extends substantially towards one of the first and second internal spaces (11 ) of the first and the second server rack (4), respectively.

10. A ventilation device (1 ) according to any of the preceding claims, characterized in that a second intermediate wall (10) is arranged with a determined distance to the intermediate wall (10) in which the distance

corresponds to the width of the first server rack (4), in which at least one face (9a) comprises the internal cavity ( 1 ) of the first server rack (4), in which the second wall entrance device is arranged on the inside of the face (9a).

11. A ventilation device (1 ) according to claim 10, characterized in that a third intermediate wall (10) is arranged at a determined distance from the intermediate wall (10), the distance is corresponding to the width of the second server rack (4), in which the intermediate wall (10) is arranged between the first and the second server rack (4).

12. A method for cooling of server racks (4) by means of a ventilation device (1 ) comprising at least one intermediate wall (10) arranged between a first internal space (11 ) of the first server rack (4) and a second internal space (11 ) of a second server rack (4), the intermediate wall (10) further comprises an internal cavity (46), a first wall entrance device (15) for inlet of cooling air (6) to the internal cavity (46) of the intermediate wall (10), at least one second wall entrance device (19) for outlet of the cooling air (6) from the internal cavity of the intermediate wall (10) to at least one of the first and second internal space (11 ) of the first and the second server rack (4) ), respectively, in which an inlet air device (48) is connected to the first wall entrance device, the method comprising the steps:

- directing of inlet air / cooling air (6) from the inlet air device (48) via the first wall entrance device to the internal cavity (46) of the intermediate wall,

- directing of inlet air / cooling air (6) from the internal cavity (46) of the

intermediate wall through the second wall entrance device (19) to at least one of the first and second internal spaces (11 ) of the first and the second server rack (4), respectively.

13. A method according to claim 12, in which the ventilation device (1 ) further comprising an adjustment mean (34a, 34b) for adjustment of the outflow through the second wall entrance device (19), in which at least one of the first and the second server rack (4) further comprising a temperature sensor, the method comprising the steps of:

- adjusting of the outflow through the second wall entrance device (19) with the help of the adjustment mean (34a, 34b) based on input from the temperature sensor.

14. A method for cooling of server racks (4) in which cooling air is directed to a internal cavity of an intermediate wall (10) arranged between two server racks (4) in which the cooling air further is directed to an internal space (11 ) of

respectively server rack (4).

15. A method according to claim 13, in which the amount of air that is directed to an internal space (11 ) of respectively server rack (4) is adjusted with the help of an adjustment mean (34a, 34b).