FI123114B - Roof diffuser to direct supply air to an interior space - Google Patents

Description

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Ceiling diffuser for supply air supply to the room

The present invention relates to a ceiling diffuser for supplying supply air to an interior space of a building, in particular to a room where the supply air is arranged to flow most of the time with a given amount of air, which consists of a duct part connecting the ceiling diffuser to the supply air duct, a frame section and a there are openings or nozzles at least at the channel portion.

10 Ventilating a building's interior, such as a room, especially a classroom, office space, or similar space, which typically has several people, is challenging. People cause a heat load that tends to gradually increase the indoor temperature of the room. There are basically two ways to compensate for this; the room 15 may be cooled mechanically or additional air may be supplied to the room. Mechanical cooling is quite expensive to install and consumes a lot of energy. Additional airflow (uncooled), in turn, can lead to excessively high airflow rates, causing discomfort and constant draft to the occupants.

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Hans Wigö's dissertation 'Technique and Human Perception of Intermittent Air Velocity Variation, September 2005, University of Gävle, Sweden' explores this problem. The dissertation aims to show that it is actually more comfortable for the occupants 25 that the air is flowing "momentarily" into the room. This more abundant airflow can last for example five minutes, after which the amount of air is brought in for example 15 minutes. pleasant room air.

The object of the present invention is to apply the above

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and the idea of a more intense co air supply at regular intervals. This is achieved by a roof diffuser, which is characterized by § 35, in that the duct section,

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cm of pipe is fitted with a tube smaller than the duct section, which is movable vertically between the lower position and the upper position.

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A preferred embodiment of the ceiling diffuser according to the invention is characterized in that, in its lower position, the tube is substantially against or near the front plate, whereby the flow of air is guided only through holes in the front plate at the channel portion.

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Another advantageous embodiment of the roof diffuser according to the invention is characterized in that, in its upper position, the tube is at a distance from the front plate, whereby the air flow is also directed to the sides.

Another preferred embodiment of the roof diffuser according to the invention is characterized in that the vertical movement of the tube is carried out by a stepper motor.

The advantages of the invention are that the ceiling diffuser can be used to distribute the supply air in pulses, i.e. sometimes more air, sometimes less, at certain intervals.

The invention will now be explained in more detail by means of preferred embodiments, with reference to the accompanying drawings, in which:

Fig. 1 is an oblique view from below of a ceiling diffuser according to an embodiment of the invention.

Figure 2 is an oblique view from below of a ceiling diffuser according to another embodiment of the invention.

Figure 3 is a side view of a ceiling diffuser according to the invention.

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σ> 9 Figure 4 shows a ceiling diffuser cj according to an embodiment of the invention, obliquely viewed from above and partially cut away.

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h-co Figure 5 shows a roof diffuser of another embodiment of the invention in the form of section 35, obliquely viewed from above and partially ™ cut.

The invention utilizes the technology presented in the above-mentioned dissertation in the form of a roof diffuser. Thus, the principle of this technique 3 is that supply air is introduced into the interior of a building, for example a room, which may be, for example, a conference room or the like, for a certain time, for example 15 minutes. Subsequently, much more supply air is introduced, for example for five minutes. Although the room temperature is not cooled more by the meter, the people in the room feel the air pulses pleasantly cool and do not feel the draft. The airflow durations mentioned above may vary, but the basic principle is that the basic flow always lasts longer than the stronger airflow.

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Fig. 1 shows a ceiling diffuser obliquely viewed from below, i.e., it shows mainly the front panel 1. The front panel has a plurality of openings 2 near the outer edges. In addition, a plurality of openings 3 or nozzles are formed substantially in the central portion of the front plate 1. In this embodiment, the aperture 15 group 3 is substantially circular. In the embodiment of Figure 2, the aperture group is in turn rectangular.

Figure 3 shows that there is a gap 5 between the front plate 1 and the frame part 4. This gap can be adjustable, for example, to two different dimensions as required.

Further, it will be seen from Figure 3 that the ceiling diffuser comprises a duct section 6 which is connected to the supply air duct (not shown) and through which the supply air is supplied to the ceiling diffuser. The roof-25 brazer according to the invention further comprises a vertically adjustable tube 7 having a slightly smaller diameter than the channel member 6. The tube further extends into the channel member 6 and, as mentioned, is movable in the vertical direction from the lower position (FIG. 3) to the upper position. between. There must be no noticeable gap between the pipe and the ™ duct section so that the air will not "escape" between the 9 and 30.

Fig. 4 illustrates the principle of the invention in more detail.

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with a seasonal view. Supply air flows through duct section 6 to ceiling diffuser co-time. A tube 7 is inserted inside the channel portion, which is thus

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§ 35 in all vertical directions. In the situation of Fig. 4, the tube 7 is in its down position, i.e. substantially against the face of the front plate 1, whereby the air is forced into the opening group 3 and hence into the room. This provides a so-called. The supply air pulse, i.e. the flow, is directed downwards and much more strongly than in the base 4 operating position of the ceiling diffuser, in which the tube 7 is raised to its upper position (not shown). When the pipe 7 is in its upper position, the supply air can flow immediately after the duct section also laterally, whereby it enters the room much more evenly.

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The ceiling diffuser is used most of the time in this so-called. This supply air flow may last for example about 15 minutes, after which the tube 7 is lowered and the air is directed to the openings 3 and further into the room. This step can take, for example, about five minutes. The two steps can then be repeated according to the same formula.

Figure 5 illustrates exactly the same principle as Figure 4 except that the opening group three is now circular in shape when in the situation of Figure 4 it is rectangular. The aperture assembly 3 may be formed of a separate body in which the apertures are made and secured to the front plate of the roof diffuser.

The tube 7, which is movable vertically between the two extreme positions in the vertical direction as the supply air flow control means, is driven, for example, by a stepper motor (not shown). The stepper motor communicates with the rotary shaft 8, which, through rotation and threading, raises and lowers the support members 9 of the tube 7 and thus the tube itself. However, this is not the only alternative and one of skill in the art can design a suitable movement mechanism as required.

It will be apparent to one skilled in the art that the invention is not limited to the exemplary embodiments shown above, but may be varied within the scope of the appended claims. Above has been described a front diffuser of the ceiling diffuser with a plurality of openings 2 closer to the outer edge. On g, it is also possible that the front plate has no openings except

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3 at channel section 3. In this case, the basic operation of the roof diffuser in the working position causes the supply air to flow from the gap between the front plate 1 and the frame member.

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§ 35 5 and, of course, also some through the openings 3. Further, it is clear that the shape of the ceiling diffuser need not be rectangular but may be any other, for example circular.

Claims (4)

1. A roof diffuser for directing supply air to an interior space, in particular a room, in a building where the supply air is arranged most of the time to flow with a certain amount of air, which roof diffuser consists of a duct part (6) connecting the roof diffuser to a supply air duct, of a frame part (4) surrounding the duct part and of a front plate (1) with openings (3) or mun of nozzles at least at the duct part, characterized in that a duct part (6), partly in the duct part, is mounted tube I (7) having a smaller diameter than the duct portion and which can be moved vertically between a lower position and an upper position, and that the tube (7) in its lower position is substantially against the front plate (1) or in the vicinity thereof, wherein the air flow is substantially controlled only through the openings (3) made at the front plate at the duct portion. Device according to claim 1, characterized in that the pipe 20 (7) is in its upper position at a distance from the front plate (1), the air flow also being directed at the sides. Device according to claim 1 or 2, characterized in that the vertical movement of the tube (7) is accomplished with a stepper motor. C \ J δ CvJ σ> cp δ X X Q. CO CO CD CD O O CvJ