AU2017265070B2

AU2017265070B2 - Air outlet for temperature controlling a room

Info

Publication number: AU2017265070B2
Application number: AU2017265070A
Authority: AU
Inventors: Hans Felser; Dietmar Rossbruch; Claus Schweinheim
Original assignee: Caverion Deutschland GmbH
Current assignee: Caverion Deutschland GmbH
Priority date: 2016-11-23
Filing date: 2017-11-22
Publication date: 2021-02-18
Anticipated expiration: 2037-11-22
Also published as: EP3327366B1; AU2017265070A1; EP3327366A1; DE202016106540U1; DE202016106540U8

Abstract

The invention relates to an air outlet (1) for controlling a temperature of room (2), in particular a lab, the air outlet including a flowable housing (4) with a length (L) and a width (B), wherein the housing includes an air inlet cross section (10) and at least one air outlet cross section (14), wherein a connection spout (9) that supplies ventilation air is provided in a portion of the air inlet cross section (10), wherein two opposite side walls (5) of the housing (4) are respectively provided with at least one jet element (12) that is configured to dispense individual ventilation air jets into the room (2) in a turbulent manner, wherein at least one channel (16) extending in a longitudinal direction of the housing (4) is arranged at a bottom side of the housing (4), wherein ventilation air is dispensable into the room (2) through the channel, wherein the bottom side of the housing (4) is closed outside of the at least one channel (16). In order to improve an air outlet for controlling a temperature of a room so that is provides high cooling power an low turbulence flow of the ventilation air which reduces a flushing of air out of a digestorium it is proposed according to the invention that the side walls (5) of the housing (4) including the at least one jet element (12) are perforated and the at least one channel (16) is arranged in an at least partially cylindrical element (17) or in plural partially cylindrical elements that are arranged in series, wherein the channel (16) is configured so that a directional change of a flow direction of the channel occurs, wherein the at least one element (17) or the plural elements (17) that are arranged in series are respectively supported rotatable about a longitudinal element axis, wherein at least one an air control element (21, 21', 21") is arranged in the housing (4). 1/2 ~ . i a 3 .-I U 0.. . U* .G . . CD a a !LU 5 . a C O UVppp. a aCao o m U U U O/j 7D & 6 .QQ8C DD GCQCOC 0 PC V 0D \S 9OD U \. D D. Cp 100).*'ig.C 9 GU UGD Ooco pDA OU ,0 'P G p o D G SP C8. 9 P© COD&6 O G GG G &D e ea .Fig.U I

Description

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AIR OUTLET FOR TEMPERATURE CONTROLLING A ROOM FIELD OF THE INVENTION

The invention relates to an air outlet for temperature controlling a room, in particular a lab, the air outlet comprising a flowable housing with a length and a width wherein the housing includes an air inlet cross section and at least one air outlet cross section wherein a connection spout that supplies ventilation air is provided in a portion of the air inlet cross section, wherein two opposite side walls of the housing are respectively provided with at least one jet element that is configured to dispense individual ventilation air jets into the room in a turbulent manner wherein at least one channel extending in a longitudinal direction of the housing is arranged at a bottom side of the housing, wherein the ventilation air is dispensable into the room through the channel wherein a bottom side of the housing is closed outside of the channel.

Plural air outlets can also be connected with each other through tubular conduits and can be jointly supplied by an individual air inlet arrangement.

BACKGROUND OF THE INVENTION

Air outlets are known in many variations in the art and can satisfy different requirements. When controlling a temperature of a lab typically reliable ventilation is required for particular work spaces wherein significant cooling is desirable in addition to providing ventilation air.

From the unpublished utility model DE 20 2015 103 138 U1 a device for laboratory ventilation is known that includes plural modules, wherein individual ceiling modules are connected by connection modules. Thus the ceiling modules are used for supplying ventilation to particular work spaces and the connection modules are mere connection element between two ceiling modules.

DE 10 2013 109 702 Al discloses an air outlet for supplying fresh air to a lab. The air outlet is characterized in that as described supra ventilation air is dispensed into the room at two side walls and at a bottom side through air outlet openings, wherein a heat exchanger module can be arranged in the portion of the air outlet openings arranged at the bottom side. When the known air outlet is provided with a heat exchanger module room air is sucked into the heat exchanger through the flow of the ventilation air flowing out of the air outlet openings arranged at a bottom side where the room air is temperature controlled and moved back into the room by the flowing ventilation air.

A substantial amount of heat is generated in labs from chemical processes performed at work places or by using burners or similar at the work places. Thus, it is desirable in particular for labs that a significant cooling of the room air is performed by the air outlet which is only possible by introducing a large amount of cooled air. Introducing a large air volume however is also problematic for two reasons: on the one hand side the large masses of cold air can be perceived as unpleasant by workers when they are hit directly by the air jet. Ontheotherhand side some labs can have the problem that so called "digestories" which are quite frequently used are flow impacted by ventilation air in a disadvantageous manner. A disadvantageous flow impact is characterized in particular by high air velocities along the digestorium e.g. in a vertical direction or at a slant angle relative to the digestorium. The high flow velocities cause a so called "flushing" of air from the digestorium into the lab space. It is appreciated that this type of air extraction from the digestorium is undesirable and can cause significant problems depending on the application.

OBJECT OF THE INVENTION

Thus, it is an object of the invention to improve an air outlet for controlling a temperature of a room so that the air outlet is characterized by high cooling power and by a flow of the ventilation air with low turbulence which at least reduces a flushing of air out of the digestorium.

SOLUTION

Improving upon the air outlet described supra the object is achieved in that the side walls of the housing that include at least one jet element are perforated and the at least one channel is arranged in one or plural at least partially cylindrical elements that are arranged in series, wherein the channel is configured so that a directional change of a flow direction of the channel is provided. Furthermore the at least one element or the plural elements that are arranged in series are respectively supported rotatable about their respective rotation axis so that an outflow direction of air flowing through the channel is adjustable relative to the air outlet. According to the invention at least one air control element is arranged within the housing of the air outlet.

An air control element according to the invention is a component that is configured to distribute ventilation air that flows into the housing of the air outlet to the side walls and the base of the housing, so that a flow impact of the at least one channel and of the at least one jet element is controllable. In particular it is desirable to adjust the air volume flows which exit the air outlet on the one hand side through the at least one channel in downward direction and on the other hand side through the perforation and optional jet elements to the sides. In particular it can be achieved by the air control element that the different air outlet cross sections, thus the jet element, the perforation of the side walls and the at least one channel at the bottom side of the housing are evenly supplied with ventilation air. Additionally the at least one air control element can be used to evenly distribute the ventilation air also or alternatively over a length of the air outlet. For example it is conceivable that respectively one third of the entire ventilation air volume flow that is supplied to the air outlet flows out through the at least one channel and respectively through the side walls (jet elements and perforations) into the room to the ventilated. This way it can be assured that the flow velocities of the air volume flows exiting the air outlet are on a uniform and low level. This is particularly important for a comfort of persons in the ventilated room and in particular under the aspect of a risk of flushing air out of a digestorium.

The ventilation air supplied through the air inlet cross section of the housing exits the housing through jet elements arranged in the side walls with a rather high velocity, thus as a turbulent jet shaped volume flow. Since the side walls of the housing are perforated an induced vacuum at the side surfaces of the housing causes ventilation air to be sucked into the room through the perforation. The ventilation air flowing into the room through the perforation of the side walls flows with low turbulence so that overall a so called mixed source ventilation is generated from the turbulent volume flow and the laminar induced ventilation air flow which can also be designated as hybrid ventilation. This embodiment facilitates to generate rather high air volume flows which are only required for dissipating the possibly significant cooling loads which, however, can operate with rather low flow velocities which keep the risk of flush out low. Additionally the flow velocities are simultaneously raised beyond an extent of mere source ventilation so that a direct "dropping" of the cooled ventilation air vertically downward does not occur. The latter typically generates a high level of discomfort and an uneven temperature distribution in the room to be ventilated.

Simultaneously with the lateral jet output ventilation air also enters the room through the at least one channel at the bottom side of the housing, wherein the channel is formed in at least one partial cylindrical element so that a change of direction occurs with respect to the flow direction of the channel. This means that air exiting from the channel is deflected within the channel wherein the deflection is advantageously performed so that the ventilation air flows out laterally and adheres to the housing from below. This so called Coanda effect is advantageous because air dispensed into the room does not flow directly to a work place but initially in a horizontal or slanted direction. Therefore it is possible to provide a highly inductive flow of the ventilation air at a bottom side of the housing which takes along a large portion of ventilation air. The adjustment or orientation of the at least one channel can be performed manually.

Therefore it is possible with the air outlet according to the invention to provide a high amount of ventilation air introduction, thus a high volume of ventilation air into the room, wherein overall a low turbulence volume flow is provided. The combination of ventilation air introduced in a turbulent manner by the at least one jet element and the channel on the one hand side and the laminar induced flow of ventilation air at the longitudinal sides of the housing on the other hand side causes a low turbulence ventilation air introduction into the room which is comfortable for the persons in the room and the risk of flushing air out of a digestorium is reduced.

Since a high amount of ventilation air introduction can be provided by the air outlet according to the invention a high level of cooling and heating power can be achieved. In spite of the overall low turbulence flow a temperature difference AT of up to 10 Kelvin can be achieved. A heat exchanger can thus be omitted entirely so that the air outlet according to the invention can be produced in a very economical manner.

In an advantageous embodiment of the air outlet according to the invention at least a horizontal air control element and at least a vertically extending air control element can be arranged within the housing. Furthermore it can be advantageous when the at least one air control element is formed by a perforated sheet. A perforated sheet is particularly well suited to distribute the ventilation air through the throttling effect achieved by the individual holes of the perforated sheet to pre flow chambers arranged behind the perforated sheet from which pre flow chambers the ventilation air transitions into the room to be ventilated.

As another embodiment of the invention it can be provided that two, three or more channels extending parallel to each other are arranged adjacent to each other in the base of the housing. The number of the channels and the flow cross section of the individual channels should be adapted to the overall required temperature control capability in order to obtain optimum individual conditions in a room.

Thus, it is furthermore advantageous when the at least partially cylindrical elements are rotatably supported independently from each other. Thus, it is possible that channels arranged adjacent to each other are oriented in different directions. When the air outlet according to the invention is arranged in a center of the room individual channels can be oriented to the right and other channels can be oriented towards the left so that the room is supplied overall with ventilation air through the channels arranged at the bottom side of the housing. It is appreciated that the channels can also be oriented in the same direction.

When an individual channel is arranged in plural at least partially cylindrical elements that are arranged in series it is furthermore possible that the individual elements can be adjusted independently from each other in various directions. Thus, a different blow out direction of the channel sections thus provided can be provided over the length of the entire channel. Adjusting the blow out direction can be performed manually and is easily adaptable to individual requirements.

In order to provide that a directional change is provided along the flow direction of the channel the channel can be provided for example angled or cambered in the at least one element viewed in the cross section of the element.

With respect to the jet element it is advantageous when the at least one jet element includes a plurality of inclined slots forming air outlet cross sections, wherein an inclination of the individual slots is respectively adjustable. This means that the individual slots are adjustable independently from each other with respect to inclination. This way it is possible to fan ventilation air that leaves the jet element out in a broad pattern. The adjustment of the inclination can thus be performed manually.

Furthermore it can be advantageous when the at least one jet element in its entirety is rotatable or arranged at the side wall associated with the jet element so that an outflow direction of the respective jet element is adjustable by rotating the jet element. In particular it is conceivable when using a plurality of jet elements to adjust each jet element individually and to thus individually adapt the jet element to the respective room to be ventilated and eventually to model the flow conditions in the room in an optimum manner. When using plural jet elements it is furthermore conceivable to provide openings of the jet elements with control elements respectively wherein the inclinations of the control elements of different jet elements is different. Typically all control elements of the same jet element have the same inclination so that a respective jet element generates an outflow direction of the ventilation air that is consistent. It is conceivable for example to provide a respective air outlet with two different types of jet elements, namely jet elements whose control elements cause no deflection or only a minimal deflection, approximately 50to 15° relative to the orthogonal on the opening wherein the deflection is imparted upon air flowing through the jet elements (steep jet elements) and such jet elements which cause a deflection of the air in a range of 30° to 60°, advantageously approximately 450 (flat jet elements). Alternative embodiments are certainly also conceivable.

When at least one row of jet elements that are offset from each other is arranged in at least one side wall of the housing a mixed source ventilation is performed over a greater length which has a positive effect upon room climate.

EMBODIMENT

The invention is subsequently described based on an embodiment with reference to drawing figures, wherein: FIG. 1 illustrates a view of a longitudinal side of the air outlet according to the invention; and FIG. 2 illustrates a cross section of the air outlet according to FIG. 1.

FIG. 1 illustrates an air outlet 1 according to the invention configured to control a temperature OF a room 2 and particularly suited for controlling a temperature in a lab. FIG. 1 illustrates a view of a longitudinal side 3 of an air outlet 1 which includes a flowable housing 4 with a length L and a width B (FIG. 2). The housing 4 is configured cuboid and includes two side walls 5 extending in the longitudinal direction and two face walls 6 extending in the transversal direction. The housing 4 further includes a cover 7 and a base 8. Typically the housing 4 is made from folded sheet metal.

A connection spout 9 is arranged at a top side of the housing 4, thus in the cover 7 wherein the air outlet 1 is provided with ventilation air through the connection spout 9. For this purpose the connection spout 9 can be connected with a tubular collector conduit wherein additional air outlets are also connected with the tubular collector conduit and in turn connected to a ventilation air system. Alternatively the connection spout 9 can be directly connected to a ventilation air system. An inside cross section of the connection spout 9 forms an air inlet cross section 10 into the housing 4. The connection spout 9 can also be arranged in a face wall 6.

It is evident that the side wall 5 of the housing 4 in FIG. 1 is perforated. Furthermore the side wall 5 includes two rows 11 of jet elements 12 that are offset from each other. The jet elements 12 are formed by circular discs in which seven respectively inclined air channels 13 are arranged wherein FIG. 1 only shows seven individual air outlet cross sections 14 of the air channels 30 of the jet elements 12. The precise configuration of the air channels 13 is described in more detail with reference to FIG. 2. The opposite side wall which is not visible in FIG. 1 is configured analogously.

While ventilation air is dispensed in a turbulent manner into the room 2 through the jet elements 12, ventilation air flows through the perforation 15 of the side wall 5 into the room 2. This generates a hybrid ventilation from the turbulent volume jet and the laminar flow along ventilation air.

FIG. 2 illustrates a cross section of the air outlet 1 according to the invention which among other things shows the configuration of the jet elements 12. The jet elements 12 include seven inclined air channels 13 viewed in cross section, wherein only three respective jet elements are illustrated in FIG. 2. Thus, the air channels 13 of the upper row 11 of jet elements 12 is oriented in an upward direction and the air channels 13 of the lower rows 11' of jet elements 12 is oriented in a downward direction. However, it is provided that the jet elements 12 can be manually adjusted independently from each other so that an individual fanning of the ventilation air into individual ventilation air jets can be provided. Thus, the air channels 13 can be oriented in a horizontal direction and in a vertical direction. Certainly jet elements 12 with another number of air channels 13 are also conceivable. FIG. 2 also shows the perforation 15 of the side walls 5.

At a bottom side of the housing 4, thus in the base 8 three channels 16 are arranged that extend parallel to each other in the longitudinal direction of the housing 4, wherein the channels 16 are respectively fabricated in an at least partially cylindrical element 17. Thus, the channels 16 are overall centrally arranged in the base 8 of the housing 4. The elements 17 have walls 18, 18' that are arranged opposite to each other in cross section and which extend in an arcuate manner or at an angle so that overall an arcuate or angled channel 16 is provided. The elements 17 are rotatably supported about their longitudinal axis so that an orientation of the channels 16 oriented therein is adjustable. The adjustment can be performed manually, wherein the orientation of the channels 16 independently from each other is adjustable so that they can be oriented in different directions.

In FIG. 2 all three channels 16 are oriented so that they point to the right and downward. Accordingly the ventilation air which flows approximately vertically into the channels 16 is deflected so that the ventilation air exits the channels 16 respectively oriented to the right and downward. The inclination of the ventilation air jet is thus flat so that the air flows exiting the channels 16 adhere to the base 8 of the housing 4 due to the so called Coanda effect and flow along the base of the housing 4. The base 8 of the illustrated air outlet 1 is closed besides the channels 16 and configured flat thus in a straight line.

Due to the geometry of the channel 16 an adjustment of an inclination of the channel 16 is not possible at will when the cross section of the channel 16 shall be used in its entirety. In the illustrated embodiment an adjustment of the channels 16 is advantageous on the one hand side in a right downward direction and in a left downward direction. Therefore two positions of the channels 16 are provided for an optimum operation of the air outlet 1 according to the invention that is illustrated in FIG. 2. Other configurations of the channel 16, however, are also conceivable.

The channels 16 extend in the longitudinal direction of the housing 4 wherein they can extend over an entire length of the housing 4 thus to the face walls 6 or can terminate at a distance from the face walls 6. The elements 17 can be configured as short pieces and can have for example a length of approximately 5 cm to 10 cm, wherein a plurality of elements 17 is arranged in a row. The individual elements are then also rotatably supported about their longitudinal axis wherein the individual elements are adjustable independently from adjacent elements in a row. In this case a different adjustment of the orientation of the individual element of a row is possible over the length of the row.

It is appreciated that the air outlet 1 according to the invention can also be configured with only one individual channel 16 or with a number of channels 16 that are arranged parallel adjacent to each other wherein the number differs from three.

A respective chamber 19 is arranged above the elements 17 and has a width which increases in flow direction (arrow 20) thus top down. While the chamber 19 respectively has a width b1 on a side that is oriented towards the element 17 and wherein the width b1 corresponds approximately to the width or diameter of the element 17 the width b2 on a side that is oriented away from the element 17 is smaller. This generates a type of opposite jet effect which slows the ventilation air flow that moves into the channels 16. The width b1 of the chamber 19 in the portion of the element 17, however, exceeds a width of the channel 16 in the element 17.

Within the housing 4 three air control elements 21, 21', 21" are arranged which extend over the entire length L of the housing 4. The air control elements 21, 21' 21' are formed by perforated plates, wherein two air control elements 21', 21" extend vertically and are arranged respectively at a distance of approximately 6 cm to 8 cm from the jet elements 12. The third air control element 21 extends horizontally between the two vertically extending air control elements 21', 21". The third air control element 21 has a distance from the base 8 of the housing 4 of approximately of 100 - 150 mm. The total height 8 of the housing 4 is approximately 250 - 280 mm.

The air control elements 21, 21', 21" are used on the one hand side to conduct or distribute ventilation air introduced from the connection spout 9 into the housing 4 over an entire length L of the pre flow chambers 22, 23, 24 arranged downstream of the air control elements 21, 21' 21", wherein the distribution of the ventilation air shall be provided as uniform as possible. Put differently the ventilation air in the illustrated embodiment shall be distributed to the pre flow chambers 22, 23, 24 so that ventilation air flows which exit the air outlet 1 through the channels 16 in downward direction and through the perforation 15 and the jet elements 12 to the respective sides are provided as uniform as possible. Put differently the air control elements 21, 21', 21" are used in particular to provide an even flow of the jet elements 12, the perforation 15 and of the channels 16. In an optimum a third of the ventilation air is respectively distributed to the two side walls 5 and flows through the jet elements 12 arranged therein and the remaining third of the ventilation air flows through the channels 16 in the base 8 of the housing 4.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge in Australia.

REFERENCE NUMERALS AND DESIGNATIONS 1 air outlet 2 room 3 longitudinal side 4 housing side wall 6 face wall 7 cover 8 base 9 connection spout air inlet cross section 11,11' row 12 jet element 13 air channel 14 air outlet cross section perforation 16 channel 17 element 18 wall 19 chamber arrow 21, 21', 21" air control element 22 pre flow chamber 23 pre flow chamber 24 pre flow chamber H height L length B width b1 width b2 width

Claims

1. An air outlet for controlling a temperature of room, in particular a lab, the air outlet comprising: a flowable housing with a length (L) and a width (B), wherein the housing includes an air inlet cross section and at least one air outlet cross section, wherein a connection spout that supplies ventilation air is provided in a portion of the air inlet cross section, wherein two opposite side walls of the housing are respectively provided with at least one jet element that is configured to dispense individual ventilation air jets into the room in a turbulent manner, wherein at least one channel extending in a longitudinal direction of the housing is arranged at a bottom side of the housing, wherein ventilation air is dispensable into the room through the channel, wherein the bottom side of the housing is closed outside of the at least one channel, characterized in that the side walls of the housing including the at least one jet element are perforated and the at least one channel is arranged in an at least partially cylindrical element or in plural partially cylindrical elements that are arranged in series, wherein the channel is configured so that a directional change of a flow direction of the channel occurs, wherein the at least one element or the plural elements that are arranged in series are respectively supported rotatable about a longitudinal element axis, wherein at least one an air control element is arranged in the housing.

2. The air outlet according to claim 1, characterized in that at least one horizontal air control element and at least one vertical air control element is arranged in the housing.

3. The air outlet according to claim 1 or 2, characterized in that the at least one air control element is formed by a perforated plate.

4. The air outlet according to one of claims 1 or 2, characterized in that two, three or more than three channels that extend parallel to each other are arranged adjacent to each other.

5. The air outlet according to any one of the claims 1 - 4, characterized in that the at least partially cylindrical elements are rotatably supported independently from each other.

6. The air outlet according to any one of the claims 1 -5, characterized in that the channel and the at least one element is configured angled or cambered in a cross section of at least one element.

7. The air outlet according to any one of the claims 1 - 6, characterized in that the at least one jet element includes a plurality of inclined slots forming a plurality of air outlet cross sections, wherein an inclination of the individual slots is respectively advantageously adjustable.

8. The air outlet according to any one of the claims 1 - 7, characterized in that the at least one jet element is rotatable in its entirety or arranged at a side wall associated with the jet element so that an inclination of the slots is adjustable by rotating the respective jet element.

9. The air outlet according to any one of the claims 1 - 7, characterized by at least one row of jet elements that are offset from each other in at least one side wall of the housing.

10. The air outlet according to any one of the claims 1 - 9, wherein the air outlet includes a plurality of jet elements characterized in that openings of the jet elements respectively cooperate with control elements, wherein inclinations of the control elements of respective jet elements are different.