This application is a National Stage completion of PCT/SE2010/000207 filed Aug. 20, 2010, which claims priority from Swedish patent application serial no. 0901265-9 filed Oct. 2, 2009.
Present invention relates to a cooling beam with VAV-function to supply cooled or heated supply air to a room, especially an air handling system. In a complete air handling system especially designed cooling beams are often included which contains functions that leads to that the room air quality is secured by selected criteria like for example temperature, CO2-level or load level in the room in which the specific cooling beam is mounted. The general comprehensive term for such a product is cooling beam, but it doesn=t exclude that it is also possible to heat the room air with the same, which then is a combined cooling beam for cooling as well as for heating. There can also, depending on the load, be necessary to change the air flow to the room, and in that case so called VAV-solutions (Variable Air Volume) are used.
In the constructions that today exists in the sector of air handling there are solutions where the supply air to a room often is supplied via a cooling beam. In such a cooling beam the supply air is supplied to the room, at the same time as a certain room air volume is sucked, through the effect of induction, into the baffle, through a cooling or heating coil and is thereby usually cooled or heated in the same.
How this mixing of supply air and recirculated room air, which flows through the cooling beam, take place depends on how the cooling beam is designed. There are a number of known solutions to this.
Common for the solutions is that the ratio between both air quantities, between supply air versus recirculating room air is controlled, so that a desired air quality is obtained in the room in which the actual cooling beam is mounted, or in a room which can include several cooperating cooling beams.
Examples of known solutions are described in WO 02/42691 A1, where the inlet air device includes an inlet air chamber (11) where several nozzles (12a1, 12a2-12b1, 12b2—) or a discharge opening exists and where an induction ratio device (15) is placed and where this device controls the combined air flow (L1+L2) or by primary control the flow (L2). Further examples of known solutions are evident from SE 523 292 where a device (15) controls the induction ratio, i.e. how large the air flow (L2) is going to be, that has to cooperate with the flow of fresh air (L1) and this ratio is controlled by a pivoting regulating disc (150).
In constructions according to the example FI 2006 00 35 there is problem that the air flowing out to the room vary in an uncontrolled way.
In the above constructions different designs of the holes, through which the supply air passes, exists, and where the air flow after those holes makes the condition for the recirculating room air to reach a mixing zone where both air flows are brought together before they flows out to the room where the comfort shall be prevailed. In those constructions the flow out of the pressure chamber to some form of mixing chamber is controlled by a number of holes which are throttled to different forms or to different throats by displacement of discs or the like and where those holes or throats therefore results in that the flow area get all imaginable designs, at the same time as the air flow after those makings of holes acquires undefined directions with risks of sound and different mixing ratios between the amounts of supply air and recirculations, than desirable.
In the present invention the device has well defined conditions regarding to the flow of supply air from a pressure chamber via a mixing chamber out to the room and consequently those working forces making the recirculation of the room air. There are no extra throttling of the air flows and accordingly a system is obtained where the pressure levels in the supply air system is held down, and accordingly a system is created which means low energy consumption to fulfill the functional demands that exists in the individual case, in the individual installation. Those well defined conditions are obtained by that:
The thoughts and the object of the present invention is therefore to eliminate the disadvantages of the constructions of today as the same time as it brings the technique forwards. Further characteristics and advantages of the invention are evident from the following description with reference to the attached figures, which shows a preferred, but not limiting embodiment of the invention.
In detail represents in diametric, partly schematic cross sections or perspective views:
a and 3b are regulating strips in some different working positions,
In a final montage/installation position the complete cooling beam is provided with some form of raster which covers the bottom surface downwards to the room where the cooling beam is mounted. The design of the raster or the design of the side plates and of the outlet zones 10 and 11 respectively is not considered in this application, because they are well known constructions.
a, 3b show principally how the regulating strip 6 is designed and how the openings 7 are constructed and orientated.
In
Common for the construction is that the regulating strip 6 is displaceably mounted on the surface 9 of the pressure chamber 2. In the surface 9, a number of holes 3 are made. The number of holes is coordinated with the regulating strip and its dimensions. The regulating strip is naturally adapted to the range of the need of air for which the respective cooling beam in its entirety is dimensioned. The construction is based on that the regulating strip 6 has a number of, preferably 6 openings 7, and where those openings are orientated in groups 8. Accordingly each group has 6 openings, preferably placed on one and the same centerline and where the dimensions of the openings is different, from a smallest to a largest one. In the figures, the openings 7 are marked as circular holes, but the geometrical form can of course vary within the frames of the invention, as well as the placement of the openings in relation to a centerline, as well as their number within the respective group and the mutual dimension of the openings 7. Every group 8 recurs in the longitudinal direction of the pressure chamber 2 with a certain approved frequency.
The holes 3 in the surface 9 lies naturally coordinated with the geometrical design that is applied to the regulating strip 6 and its openings 7. The holes 3 in the surface 9 have at least the same dimension as the largest opening 7 and it exists a hole in the surface 9 per each group 8. Consequently the holes 3 recur in the longitudinal direction of the pressure chamber 2 with the same frequency as the groups 8 in order to be coordinated with the positions of the openings 7 and consequently to care for that it always is the same number of openings/holes for the supply air from the pressure chamber into the mixing chamber and that the placing of which always is the same in relation to the cooling/heating coil and to the mixing chamber. Taken together, the approved angle of the surface together with the approved position and the recurring frequency of the holes/openings for the out flowing supply air L1 from the pressure chamber into the mixing chamber results in that an optimal induction effect is secured, with optimal utilization of the entire cooling/heating coil towards the projected area of the room, along the whole length of the cooling beam, independent of the existing dimensions of the openings 7. When the regulating strip 6 is displaced, manually or via some kind of actuator, the openings 7 consequently will be displaced, so that, as is shown in the example of
A further possibility to regulate the flow L1 is obtained in the case when the regulating strip 6, which is individually displaceable in relation to the holes 3 in the surface 9, on one side of the complete cooling beam 1, is displaced so that for example the largest opening 7, as is shown in
Number | Date | Country | Kind |
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0901265 | Oct 2009 | SE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/SE2010/000207 | 8/20/2010 | WO | 00 | 8/10/2011 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2011/040853 | 4/7/2011 | WO | A |
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Number | Date | Country | |
---|---|---|---|
20120216986 A1 | Aug 2012 | US |