GB2415247A

GB2415247A - Air supply device

Info

Publication number: GB2415247A
Application number: GB0511773A
Authority: GB
Inventors: Reijo Villikka; Mika Ruponen; Risto Kosonen; Tuomas Moilanen
Original assignee: Halton Oy
Current assignee: Halton Oy
Priority date: 2004-06-18
Filing date: 2005-06-09
Publication date: 2005-12-21
Anticipated expiration: 2025-06-09
Also published as: FR2871874B1; FI20040855A0; FI119126B; SE0501360L; FI20040855A; FR2871874A1; GB2415247B; GB0511773D0

Abstract

An air supply device 10 comprises at least one heat exchanger 13 that cools or heats circulated air L2 from a room, which is induced into the device 10 by fresh air L1 conducted from a supply chamber 11, and the circulated L2 and fresh air L1 are mixed in a mixing chamber 14 and is directed downwards or obliquely downwards (figs 6A - 8) from the device 10 through a perforated surface 15 as a combined airflow L1+L2. Fresh air L1 from the supply chamber 11 is introduced via nozzles 12a1, 12a2 etc. or a gap (12, fig 2). Surface 15 may be a plate and attached to the device 10 by screws R1, R2 etc. or may be an integral structure of the device 10. Device 10 may be wall or ceiling mounted. Circulated air L2 may be induced into the supply device 10 by perforations n1, n2 etc. in a top side part and/or perforations j1, j2 etc. in the top of the device 10. Supply chamber 11 may be disposed below the heat exchanger 13 (figs 6A - 8). The perforations in surface 15 may vary in size, number and shape so that a controlled low velocity of airflow is obtained and prevents a draught in the room.

Description

24 1 5247 Supply air terminal device The invention concerns a supply air

terminal device.

Known in the state of the art are supply air solutions, in which device solutions the flow of supply air is conducted as a flow of fresh supply air into a supply air chamber and from this through nozzles or a nozzle gap further to the exit side of a heat exchanger and into a mixing chamber. Said supply airflow conducted from nozzles attracts the flow of circulated room air making it flow by way of the heat exchanger. In the heat exchanger the circulated airflow from the room space can be either cooled or heated. From the mixing chamber after the heat exchanger the flow of outside supply air and the circulated airflow are combined and the com- bined airflow is made to flow away from the device and its vicinity. The present application aims at finding an improvement on the device solution, where the combined airflow of outside supply airflow blown away from the supply air ter- minal device and the circulated airflow is made to flow downwards in the direc- tion of earth's gravity field. The device may be located on a wall or in the ceiling of the room, but also elsewhere in the room. It has been a problem that when leav ing the device the airflow gains much in speed and thus the best possible comfort and good residence conditions are not achieved in the zone of occupancy. In the case of blowing downwards for cooling purposes it is an especially prominent feature in the solutions that the airflow tends generally to drop downwards, and another feature is the initial speed in a downward direction brought about by the device. These are summed, the velocity of flow becomes too high, which causes a sense of draught in the zone of occupancy.

This application proposes the use of a perforated plate or equivalent after the mix- ing chamber in order to achieve a controlled outlet velocity for the airflow. The perforated plate is preferably exchangeable in each individual device or in such a way that at a certain place of location, for example, on a wall, it is possible to use a perforated plate structure of a certain type. Thus, the size of the holes, that is, the ratio of perforation to the solid part of the plate can be chosen as desired, as can the shape of the holes. The holes may be holes with a circular cross- section, ellip- tic holes or holes with a rectangular cross-section. The holes can be made as de sired by punching in a plate blank. Said perforated plate functioning as an air dis- charge surface can be attached in a removable manner by attaching means in con- nection with the supply air terminal device in a mouth after its mixing chamber.

The perforated plate solution according to the invention is suitable both in an open supply air terminal device solution, which is here understood as being a device solution, where a circulated airflow is conducted through a heat exchanger from a room above the device either from a side of the device above the heat exchanger and further with a changing direction downwards, or in such a way that the air- flow will generally arrive in connection with the device from above, first in con nection with the heat exchanger and from this directly through the heat exchanger into the mixing chamber. The air discharge surface according to the invention, which comprises a perforation, can also be fitted in so-called closed models, which are understood as being device solutions, which are closed on the sides and at the top and wherein a circulated airflow is conducted to the heat exchanger from below through the centrally located heat exchanger and further into mixing chambers located at the sides, into which is also conducted a flow of fresh air from the supply air chamber, from both sides of the supply air chamber through a nozzle gap or nozzles and into the mixing chamber. The invention is thus gener- ally suitable for device solutions, where the combined airflow of fresh supply air and the room's circulated airflow are conducted from the device directly downwards in the direction g of the field of earth's gravity or obliquely in relation to this downwards from the device.

The supply air terminal device according to the invention is characterized by the features presented in the claims.

In the following, the invention will be described by referring to some advanta- geous embodiments of the invention shown in the figures of the appended draw- ing, but there is no intention to limit the invention to these embodiments only.

Figure 1A is an axonometric view of a first advantageous embodiment of the in- vention.

Figure 1B is a sectional view along line I-I of Figure 1A.

Figure 2 shows an embodiment otherwise similar to the one shown in Figures 1A and 1B, but the device solution of Figure 2 comprises a nozzle gap instead of noz- zles.

Figures 3A and 3B show an embodiment of the invention, which is otherwise IS similar to the embodiment shown in Figures 1A and 1B, but in this device solu- tion the airflow is conducted to both sides of the device's vertical central axis from the supply air chamber.

Figure 3B is a sectional view along line II-II of Figure 3A.

Figure 4 shows an embodiment otherwise similar to the one shown in Figures 3A and 3B, but in the solution shown in Figure 4 the supply air chamber comprises a nozzle gap on both sides.

Figure 5A shows a perforated plate in connection with the discharge opening of the mixing chamber.

Figure 5B shows the device of Figure SA from the direction of arrow Kit in Figure SA.

Figure 6A is an axonometric view of an embodiment of a device solution accord- ing to the invention, where air Lo is conducted from above the supply air chamber under the heat exchanger first to one side and then downward.

Figure 6B is a sectional view along line III - III of Figure 6A and the presentation is axonometric.

Figure 6C shows the device from the direction of arrow K2 in Figure 6B.

Figure 7 shows an embodiment of the invention otherwise similar to the embodi- ment shown in Figures 6A, 6B and 6C, but in this embodiment the circulated air- flow L2 from room H is conducted to be in connection with a heat exchanger 13 from a side of the device and from above the device.

Figure 8 illustrates an embodiment relating to Figures 6A, 6B, 6C and 7, wherein the nozzles 12a, 12a2 are replaced by a nozzle gap 12. In other respects the solu tion shown in Figure 7 is similar to the solution according to the embodiment shown in Figures 6A, 6B, 6C and 7.

Figures 1A and 1B show a first advantageous embodiment of the invention. Fig- ure 1B is a sectional view along line I - I of Figure 1A. The view of Figure 1A is an axonometric one. The supply air terminal device 10 comprises a supply air chamber 11 and therein nozzles 12a, 12a2 or a nozzle gap 12 (in Figure 2). The supply air terminal device 10 according to the invention comprises a heat ex changer 13. In the device solution, a flow of fresh air Lo is conducted from the supply air chamber 11, from its nozzle gap 12 or nozzles 12a, 12a2... into a mix- ing chamber 14, whereby it induces a circulated airflow L2 from room H making it flow through the heat exchanger 13. The flow of fresh air arrives in the supply air chamber 11 from a system of tubes P. The heat exchanger 13 can be used to either cool or heat the circulated airflow L2. Thus, the circulated airflow L2 from the room can be either heated or cooled by using the heat exchanger 13. The flow of fresh supply air Lo from the supply air chamber 11 induces the circulated air- flow L2 to flow through the heat exchanger, and in the mixing chamber 14 located after the heat exchanger 13 the airflows Lit and L2 are mixed together, and in ac- cordance with the invention the combined airflow Lit + L2 is conducted on to an air discharge surface 15 covering the mixing chamber's 14 outlet opening D, which discharge surface comprises a perforation al, a2... The air discharge surface used is preferably a perforated plate. In Figures 1A, 1B letter g indicates the direction of earth's gravity and the device is attached to a wall W in the room as shown in the figure. By using a perforated plate in the opening located after the mixing chamber 14 a controlled low velocity is obtained for the airflow and any sense of draught is avoided in the zone of occupancy in the room H. Figure 2 shows a solution otherwise similar to the one shown in Figures 1A and 1B, but in the embodiment shown in this figure a nozzle gap 12 is used instead of the nozzles fan, 12a2.... In this manner the flow of outside supply air Lo is di- rected downwards from the nozzle gap 12 and further to the exit side of heat ex- changer 13, where it induces a circulated airflow L2 through the heat exchanger 13 into the mixing chamber 14. The air discharge surface 15 is a perforated plate comprising a through-perforation al, a2... at the mouth D on the exit side of the mixing chamber 14. The airflow Lo + L2 is downwards from the device.

Figures 3A and 3B show an embodiment of the invention, which is otherwise similar to the embodiment shown in Figures 1A and 1B, but in this solution the airflow is conducted to two sides of the device's vertical central axis Y from the supply air chamber 11. The device solution is symmetrical in relation to the verti- cal central axis Y. The air is thus made to flow downwards from the supply air chamber 11 from both sides of the device, and the mixing chambers 14 in their exit opening D comprise a discharge surface 15 provided with a perforation al, a2..., and in the embodiment shown in the figure the air discharge surface is pre ferably formed by a perforated plate and the openings al, a2... are holes made in the perforated plate, for example, as punched or cut holes They may have the sha- pe of a circle, an ellipse etc. The airflow Lo + L2 is downwards from the device.

Figure 4 shows an embodiment otherwise similar to the embodiment shown in Figures 3A and 3B, but in this solution the supply air chamber comprises in both its sides a nozzle gap 12 instead of nozzles. An arrow g indicates earth's field of gravity. The device solution shown in the figure is suspended in the ceiling of the room H. A perforated plate functions as the air discharge surface 15 at the mouth ofthe mixing chamber 14.

Figure 5A shows a perforated plate 1 S in connection with the outlet opening D of mixing chamber 14 at the mouth D on the exit side of mixing chamber 14.

Figure SB is a view from direction k2 in Figure SA. The air discharge surface IS, such as a perforated plate, can be connected in a removable manner by attaching means Rat, R2..., such as screws, to cover the opening D. Figure 6A is an axonometric view of an embodiment of a device solution accord- ing to the invention, wherein air Lit is conducted from above the supply air cham ber from under the heat exchanger first to the side and then downward. The device can be mounted on a wall.

Figure 6B is a sectional view along line III - III of Figure 6A and the presentation is an axonometric one.

Figure 6C shows the equipment seen from the direction of arrow k2 in Figure 6B.

Figures 6A, 6B and 6C show an embodiment of the invention, where the airflow is conducted from room H from a side through a perforation no, n2.

in the top part of the device's box-section body to a heat exchanger 13 located in the top part of the supply air terminal device and further from the supply air chamber 11 for fresh air, from above and induced by an airflow Lo conducted from nozzles fad, 12a2... or from a nozzle gap 12 to flow through heat exchanger 13 to be in connection with a curved airguiding surface 100, which deflects the airflow downwards and into an exit chamber 16. The combined airflow Lo + L2 will flow from the exit chamber 16 directly downwards from the supply air terminal device and, in addition, there is a second airflow Lit + L2, which flows obliquely in relation to the vertical plane g downwards from the supply air terminal device 10...DTD: The flows take place through the air discharge surfaces 15.

Using the heat exchanger 13 it is possible to either cool or heat the circulated air- flow L2. The discharge surface 15 is a perforated plate, which is a part of the de- vice's box-section body and forms an integrated structure with the body structure, that is, the box-section body of the supply air terminal device.

Figure 7 shows an embodiment of the invention, which is otherwise similar to the embodiment shown in Figures 6A, 6B and 6C, but in this embodiment the circu- lated airflow L2 from the room space is conducted to the side and from above to the heat exchanger 13. The air discharge surface 15 comprises a discharge surface 15, from which the air is made to flow downwards, and a second air discharge surface 15, through which the air is made to flow obliquely downwards. The dis- charge surfaces 15 may have a similar or different perforation al, a2.... The com- bined airflow Lo + L2 is thus made to flow in a similar manner as in the previous embodiment downwards and, in addition, through a second side surface obliquely downwards in relation to the vertical plane g. In the embodiment shown in Figure 7, the airflow thus arrives through a perforation it, i2. .. located on top of the sup- ply air terminal device 10 to flow inside the supply air terminal device 10 and further to reach the heat exchanger 13 and through a perforation no, n2, n3. . . in the side of the supply air terminal device 10 to reach the heat exchanger 1 3.

Figure 8 illustrates another nozzle structure relating to the embodiment shown in Figures 6A, 6B, 6C and 7 and connected to the supply air chamber, where instead of the individual nozzles fan, 12a2. . . there is one nozzle gap 12, from which the air Lit discharges into the mixing chamber 14.

Claims

Claims 1. Supply air terminal device (10) comprising a supply air chamber

(13) and the- rein a nozzle gap (12) or nozzles (12al, 12a2...) and which supply air terminal device (10) comprises at least one heat exchanger (13), which is used to either cool or heat a circulated airflow (L2) conducted from a room (H), and that in the device solution an airflow (Lit) conducted from a supply air chamber (11), from its nozzle gap (12) or from nozzles (fad, 12a2...) induces a circulated airflow (L2) from the room (H) to flow through the heat exchanger (13), whereby a flow (Lo) of fresh air conducted from the supply air chamber (11) is combined in a mixing chamber (14) with the room's circulated airflow (L2) arriving from the heat exchanger (13), whereby the combined airflow (Lit + L2) is directed downwards or obliquely downwards from the supply air terminal device into the room (H), cha- racterised in that after the mixing chamber (14) in the direction of flow an air discharge surface (15) is located, which comprises a perforation (at, a2. )
2. Supply air terminal device (10) according to claim 1, characterized in that a perforated plate functions as the air discharge surface (15).
3. Supply air terminal device (10) according to claim 1 or 2, characterized in that the air discharge surface (15) is attached by attaching means (Rat, R2...) to the supply air terminal device (10) and it can be detached from this by opening the attaching means (Rat, R2. . )
4. Supply air terminal device (10) according to claim 1, characterized in that the supply air terminal device (10) is mounted on a wall.
5. Supply air terminal device (10) according to claim 1 or 4, characterized in that the device (10) in the body structure comprises openings (nit, n2) in the top part of the supply air terminal device (10) at its side for the circulated airflow (L2), and that under the heat exchanger (13) there is a supply air chamber (11) for fresh air and therein nozzles (fan, 12a2), from which air (Lo) is made to flow inducing a circulated airflow (L2) from the room (H) to flow through the heat exchanger (13) downwards in the supply air terminal device, and that the combined airflow (Lit + L2) is made to flow from the mixing chamber (14) into an exit air chamber (16), from which the combined airflow (Lo + L2) is conducted through the air discharge surface (15) into the room (H).
6. Supply air terminal device (10) according to claim 1 or 5, characterized in that the device comprises a discharge surface (15), from which the air is made to flow downwards, and a second air discharge surface (15), through which the air is made to flow obliquely downwards.
7. Supply air terminal device (10) according to claim 1 or 5, characterized in that the air discharge surface (15) is one integrated structure with the body structure of the supply air terminal device (10).