Device and method for controlling a supply air flow at a comfort cassette

Abstract

A comfort cassette (1) and a method which comprises a pressure box (2) with an inlet (3) and a plurality of outlets (4) for through flow of a supply air flow (L1). The outlets (4) are arranged at more than two of the pressure box edges (5a, 5b, . . . 5n) and form a group (6a, 6b, . . . 6n) of outlets per edge (5a, 5b, . . . 5n). The outlets are arranged in a configuration which is changeable by outlets (4) of a cover member (8) when the cover member (8) is displaced in relation to the outlets (4) of the pressure box (4). The cover member (8) is arranged to change simultaneously the configuration of all groups (6a, 6b, . . . 6n) of the outlets, by movement of the cover member (8) in only one direction, while the supply air flow (L1) is changeable in more than two directions by movement of the cover member.

Claims

1. A comfort cassette (1) comprising: a pressure box (2) with at least one inlet (3) for inflow of supply air flow (L1) to the pressure box (2) and a plurality of outlets (4) for outflow of the supply air flow (L1) out of the pressure box (2), the outlets (4) of the pressure box (2) being arranged along more than two edges (5a, 5b, . . . 5n) of an underside of the pressure box (2), the outlets (4) of the pressure box (2) forming a group (6a, 6b, . . . 6n) of outlets per edge (5a, 5b, . . . 5n) of the pressure box (2), each respective group (6a, 6b, . . . 6n) of outlets (4) of the pressure box (2) being arranged to direct the supply air flow (L1) to a respective mixing chamber (7b, . . . 7n) per group (6a, 6b, . . . 6n), the comfort cassette (1) further comprising at least one coupled heat a exchanger (9) arranged to alternatively cool or heat a through-flowing air stream by heat exchange, and a circulation air flow (L2) being arranged to flow from a premises (A) through the heat exchanger (9) due to an induction effect driven by passage of supply air flow (L1) out of the outlets (4) to the respective mixing chamber (7b, . . . 7n), the respective mixing chamber (7b, . . . 7n) being arranged to unite the supply air flow (L1) from the pressure box (2) and the circulation air flow (L2), following conditioning of the circulation air flow (L2) by the heat exchanger (9), into a common air stream (L1+L2) and to guide the common air stream (L1+L2) to a respective outlet opening (10b, . . . 10n) for outflow to the premises (A), the outlets (4) of the pressure box (2) being arranged according to a configuration which is changeable by displacement of outlets (4′) of a cover member (8) in relation to the outlets (4) of the pressure box (2), the cover member (8) being located between the heat exchanger (9) and the underside of the pressure box and the cover member (8) extending from adjacent a first edge (5a, 5b, . . . 5n) of the pressure box to adjacent a second opposed edge (5a, 5b, . . . 5n) of the pressure box for movement toward and away from the first and second edges of the pressure box (2) between the heat exchanger (9) and the underside of the pressure box, and the outlets (4, 4′) of the pressure box and the cover member being arranged so that an outflow of the common air stream (L1+L2) flows out from the outlet openings in more than two directions, the outlets (4′) of the cover member (8) being arranged to change a configuration of all groups (6a, 6b, . . . 6n) of outlets (4) simultaneously by movement of the cover member (8) in only a single direction of movement, and the supply air flow (L1) and thereby also the common air stream (L1+L2) out of the comfort cassette (1) being changeable in more than two directions by only a single movement of the cover member (8), whereby the outflow of the common air stream (L1+L2) out from the outlet openings is controlled in more than two directions by the single movement of the cover member.

2. The comfort cassette (1) according to claim 1, wherein the cover member (8) is designed as a pate with portions close to the groups (6a, 6b, . . . 6n) of outlets (4), and the pate being arranged to move linearly whereby the configuration of all groups (6a, 6b, . . . 6n) of the outlets (4) simultaneously change.

3. The comfort cassette (1) according to claim 1, wherein an opening degree of each respective outlet (4) of the pressure box (2) is step-less adjustable from 0-100%.

4. The comfort cassette (1) according to claim 1, wherein the outlets (4) are arranged along four edges (5a, 5b, 5c, 5d) of the pressure box (2) and the outflow of the common air stream (L1+L2) flows out from the respective outlet opening (10b, 10d) simultaneously in four different directions, so-called four-way air distribution, whereby an air flow is controlled in all four directions by a change of a configuration of the outlets (4).

5. The comfort cassette (1) according to claim 1, wherein at least one actuator (12) is arranged at the comfort cassette (1), the at least one actuator (12) is further arranged to cooperate with the cover member (8) to provide the change of configuration of the groups (6a, 6b, . . . 6n) of the outlets (4).

6. The comfort cassette (1) according to claim 5, wherein the pressure box (2) comprises at least one pressure measuring socket (13), useful for representative control of a static pressure (ps) in the pressure box (2), and the static pressure (ps) in the pressure box (2) and a position of the at least one actuator (12) is recordable, and the supply airflow (L1) in the comfort cassette (1) is calculable based on the static pressure (ps) and the position of the at least one actuator (12).

7. A method for controlling supply air flow (L1) at a comfort cassette (1), comprising a pressure box (2) with at least one inlet (3) for inflow of supply air flow (L1) to the pressure box (2) and a plurality of outlets (4) for outflow of the supply air flow (L1) out of the pressure box (2), the outlets (4) of the pressure box (2) are arranged along more than two edges (5a, 5b, . . . 5n) of an underside of the pressure box (2), wherein the outlets (4) of the pressure box (2) form a group (6a, 6b, . . . 6n) of outlets per edge (5a, 5b, . . . 5n) of the pressure box (2), and each respective group (6a, 6b, . . . 6n) streams the supply air flow (L1) to a respective mixing chamber (7b, . . . 7n) per group (6a, 6b, . . . 6n), the comfort cassette (1) further comprising at least one coupled heat exchanger (9) arranged alternatively to cool or heat a through-flowing air stream by a heat exchange, and a circulation air flow (L2) flows through the heat exchanger (9) from a premises (A) due to induction effect driven by a passage of supply air flow (L1) out of the outlets (4) of the pressure box (2) to the respective mixing chamber (7b, . . . 7n), and the respective mixing chamber (7b, . . . 7n) unites the supply air flow (L1) and the circulation air flow (L2), conditioned by the heat exchanger (9), to a common air stream (L1+L2) and guides the common air stream (L1+L2) to a respective outlet opening (10b, . . . 10n) for outflow to the premises (A) simultaneously in different directions, the outlets being arranged so that an outflow of the common air stream (L1+L2) flows out from the outlet openings in more than two directions, the method comprising: arranging the outlets (4) of the pressure box (2) according to a configuration which is changeable by outlets (4) of a cover member (8) which is displaced in relation to the outlets (4), locating the cover member (8) between the heat exchanger (9) and the underside of the pressure box and extending the cover member (8) from adjacent a first edge (5a, 5b, . . . 5n) of the pressure box to adjacent a second opposed edge (5a, 5b, . . . 5n) of the pressure box for movement toward and away from the first and second edges of the pressure box (2) between the heat exchanger (9) and the underside of the pressure box, performing step-less movement of the cover member (8), and forming the outlets (4) of the pressure box and the outlets (4) of the cover member (8) as elongated slots which are orientated longitudinally in a direction of movement of the cover member (8), whereby an opening degree of the respective outlet (4) of the pressure box (2) is step-less adjustable from 0-100%, simultaneously changing the configuration at all groups (6a, 6b, . . . 6n) of the outlets (4) by a movement of the cover member (8) in only one direction, and changing the supply air flow (L1), and thereby also the common air stream (L1+L2) out of the comfort cassette (1), in more than two directions by only movement of the cover member (8) in a single direction, whereby the outflow of the common air stream (L1+L2) out from the outlet openings is controlled in more than two directions by the single movement of the cover member.

8. The method according to claim 7, further comprising linearly changing movement of the cover member (8).

9. The comfort cassette (1) according to claim 5, wherein the outlets (4) of the pressure box (2) and the outlets of the cover member (8) are all formed as elongated slots which are orientated longitudinally in a direction which extends parallel to the direction of movement of the cover member (8).

10. The method according to claim 7, further comprising at least one actuator (12) cooperating with the cover member (8) to provide the change of configuration of the groups (6a, 6b, . . . 6n).

11. The method according to claim 10, further comprising the pressure box (2) comprises at least one pressure measuring socket (13), useful for representative control of static pressure (ps) in the pressure box (2), registering the static pressure (ps) in the pressure box (2) and a position of the at least one actuator (12), and calculating a real supply airflow (L1) in the comfort cassette (1) based on the static pressure (ps) and the position of the at least one actuator (12).

12. The method according to claim 11, further comprising moving, at a detected need of change of air flow and/or comfort in the premises, the cover member (8), via the at least one actuator (12), to regulate a desired set point based on the supply air flow (L1).

13. A comfort cassette (1) comprising: a pressure box (2) having at least one inlet (3) for inflow of supply air flow (L1) into the pressure box (2) and a plurality of outlets (4) for outflow of the supply air flow (L1) out of the pressure box (2), the outlets (4) of the pressure box (2) being arranged on an underside (U) of the pressure box (2) along at least four edges (5a, 5b, . . . 5n) thereof, the outlets (4) being combined so as to form groups (6a, 6b, . . . 6n) of outlets located along each edge (5a, 5b, . . . 5n) of the pressure box (2), each respective group (6a, 6b, . . . 6n) of outlets (4) being arranged to direct the supply air flow (L1) toward a respective mixing chamber (7b, . . . 7n) associated with each group (6a, 6b, . . . 6n), the comfort cassette (1) further comprising at least one coupled heat exchanger (9) arranged to alternatively cool or heat a through-flowing air stream flowing from a premises (A) through the heat exchanger (9) due to an induction effect caused by passage of supply air flow (L1) out of the outlets (4) to the respective mixing chamber (7b, . . . 7n), the respective mixing chamber (7b, . . . 7n) being arranged to unite the supply air flow (L1) from the outlets (4) with the circulation air flow (L2), following conditioning of the circulation air flow (L2) flowing through by the heat exchanger (9), into a common air stream (L1+L2) and to guide the common air stream (L1+L2) to a respective outlet opening (10b, . . . 10n) for outflow to the premises (A), a single cover member (8), having a plurality of openings (4′) being located between the heat exchanger (9) and the undersurface of the pressure box, which extends parallel to a surface of the heat exchanger (9) which faces toward the underside (U) of the pressure box (2), and the single cover member (8) extending from adjacent a first edge (5a, 5b, . . . 5n) of the pressure box to adjacent a second opposed edge (5a, 5b, . . . 5n) of the pressure box between the heat exchanger (9) and the underside (U) of the pressure box, the outlets (4) of the cover member (8) being arranged according to a configuration which is changeable by displacement of the single cover member (8) relative to the outlets (4) of the pressure box (2), and the outlets being arranged so that an outflow of the common air stream (L1+L2) flows out from the outlet openings in more than two directions, the outlets (4, 4′) of the pressure box and the cover member each being formed as elongated slots which are orientated along the direction of displacement of the single cover member (8), the single cover member (8) being arranged to change a configuration of all groups (6a, 6b, . . . 6n) of the outlets (4) simultaneously by movement of the single cover member (8) in only a single direction of movement away from the first edge of the pressure box (2) toward the opposite second edge of the pressure box (2) or vice versa, and the supply air flow (L1), and thereby also the common air stream (L1+L2) out of the comfort cassette (1), being changeable in more than two directions by movement of the single cover member (8) either toward or away from the first edge of the pressure box (2), whereby the outflow of the common air stream (L1+L2) out from the outlet openings is controlled in more than two directions solely by the movement of the single cover member.

14. The comfort cassette according to claim 13, further comprising an actuator (12) which cooperates with the cover member (8) to move the cover member (8) either toward or away from the first edge of the pressure box (2).

Description

SHORT DESCRIPTION OF THE FIGURES

(1) Below schematic figures show:

(2) FIG. 1 shows a schematic sketch of a section through a comfort cassette according to the invention.

(3) FIG. 2 shows a comfort cassette in a view straight from below, where the heat exchanger is removed.

(4) FIG. 3 shows a comfort cassette in a view obliquely from below, where the heat exchanger is removed and an actuator is provided on the comfort cassette.

(5) The structural design of the present invention is apparent in the following detailed description of an embodiment of the invention with reference to the accompanying drawings showing a preferred but not limiting embodiment of the invention.

DETAILED DESCRIPTION OF THE FIGURES

(6) FIG. 1 shows a section through a comfort cassette 1 according to the invention. The comfort cassette 1 usually is adopted by dimensions with existing module dimensions for standard ceilings. According to the example the comfort cassette 1 is adopted to fit in module dimensions 600×600 mm or alternatively 600×1200 mm. Mainly the comfort cassette 1 comprises a pressure box 2, a heat exchanger 9, a lower part 14, preferably a perforated steel sheet, and side plates 15 plus a number of details for connecting and hinging of the unit in the ceiling. To the pressure box 2 is a supply air flow L1 supplied through an inlet 3 (see FIGS. 2 and 3) and the pressure box 2 comprises further a number of outlets 4, through which the supply air flow L1 flows. The outlets 4 are arranged along respective edge 5a,_5b, . . . 5n of the pressure box 2 and form by that a respective group 6a, 6b, . . . 6n per side (see FIG. 2). The supply air flow L1 that flows through the pressure box 2 builds up a certain pressure in the pressure box depending on the total area of open outlets 4 in relation to the supply air flow L1. When the supply air flow L1 flows further out through the outlets 4, a circulation flow L2 is generated through induction effect and the circulation airflow L2 is sucked, for example from a premises A, up through the heat exchanger 9 and is cooled or heated depending on the configuration of the comfort cassette 1. The supply airflow L1 and the circulation air flow L2 are mixed in a respective mixing chamber 7b, . . . 7n per side and flow out as a common air stream L1+L2 through a respective outlet opening 10b, . . . 10n per side 11a, 11b, . . . 11n of the comfort cassette 1. A cover member 8 is displaceable arranged on the underside U of the pressure box 2 and the cover member 8 of the preferred embodiment consists of an integral plate with portions in close connection to the outlets 4. When the outlets 4′ of the cover member 8 are displaced, the outlets 4 in all groups 6a, 6b, . . . 6n will partially or completely be covered by the portions which are close to the outlets 4′ of the cover member. The cover member 8 is according to FIG. 1 displaceable inwardly and outwardly relative to the viewer. In the figure is also shown a pressure measuring socket 13, which is useful for control of a representative static pressure in the pressure box 2.

(7) FIG. 2 shows the comfort cassette 1 in a view straight from below and where the heat exchanger 9 is removed to better illustrate amongst other elements the cover member 8 and the outlets 4′. The outlets 4′ are arranged in groups 6a, 6b, 6c, 6d with one group per side 11a, 11b, 11c, 11d of the comfort cassette 1. Symbolically the common air stream L1+L2 is drawn as arrows which illustrates the air leaving the comfort cassette 1 in four directions—so called four-way air distribution. The supply air flow L1 flows into the pressure box 2 via the inlet 3 and further out through the outlets 4, as described earlier. The outlets 4, 4′ are according to the preferred embodiment arranged as elongated slots and orientated longitudinally and in the same direction as the moving direction of the cover member 8, at all groups 6a, 6b, 6c, 6d of outlets 4, 4′. In the figure, the cover member 8 can be moved back and forth in direction between the sides a-c. The cover member 8 is as earlier described arranged as a disc, preferably a disc with a hole in the middle to save material, but with portions of steel sheet or other suitable material in connection to the outlets 4. The cover member 8 is provided with corresponding slots as the outlets 4′, and the slots will open the outlet 4 for through flow and respectively close the outlet 4 for throttling of supply air flow L1. In the figure can be seen at least one scale 16, which shows the number of millimeters of open outlet 4 area.

(8) FIG. 3 shows the comfort cassette 1 in a view obliquely from below, and where the heat exchanger 9 is removed to better illustrate amongst other elements the cover member 8 and the outlets 4′. Further, an actuator 12 is arranged at the comfort cassette 1, and the actuator 12 is arranged to move the cover member 8 by a linear movement. One end of a hose 17 connected to the actuator 12, and the other end of the hose 17 is connected to the pressure measuring socket 13. The actuator 12 registers the static pressure in the pressure box 2 via the pressure measuring socket 13 and the hose 17, and this pressure together with the information of the position of the actuator 12, gives through a calculation the knowledge of the actual and real supply air flow L1 through the comfort cassette 1. The inlet 3 connects to the comfort cassette 1 to a supply air duct (not shown), which is a part of an air handling system (not shown). Other details are apparent in the description in connection to FIGS. 1 and 2.

PARTS LIST

(9) 1=comfort cassette 2=pressure box 3=inlet 4=outlet 5=edge (pressure box) 6=group (outlet) 7=mixing chamber 8=cover member 9=heat exchanger 10=outlet opening 11=side (comfort cassette) 12=actuator 13=pressure measuring socket 14=lower part 15=side plate 16=scale 17=hose A=premises L1=supply air flow L2=circulation air flow L1+L2=common air stream