Heating or cooling arrangement

Technical field: The present invention relates to a heating or cooling arrangement to be fitted in a plane in a room between its upper and lower limiting area and comprising a housing which has two opposite openings, in which connection the housing is arranged in the plane in such a way that one of the open- ings is directed towards the Lower limiting plane of the room, and a finned element arranged in the housing, in which ele¬ ment there extends at Least one elongate conduit.

Prior art: In order to obtain a uniform and comfortable temper¬ ature in a room, which temperature can differ from the natural outside temperature very substantially depending on the time of year and the activity being carried out in the room, vari¬ ous types of heating and cooling installations are known, and also pure ventilation installations. The last-men ioned type - ventilation installations - create, assuming an ab¬ sence of heating or cooling elements, only a circulation of the air present in the room and do not normally provide any change in temperature other than possibly a levelling out of the temperature in the upper and lower areas of the room.

In order to create a change in the temperature in the room, it is known to heat panels by means of hot water or by electric means. It is also known to lower the room temperature by cooling panels, which absorb heat from the surroundings. Moreover, it is already known to allow air to flow in through elements which, depending on the desired temperature in the room, are warmer or colder than the air present in the room.

In line with the increasing use of electronics in ' office environments, a Largely unintentional heat transfer has been created. In this connection. there is an increased requirement for cooling installat ons in these environments which more often than not have a false ceiling in the upper area of the room. Many of these false ceilings are of the

open false ceiling type and have a grid ceiling which is supported by a support framework and through which one can easily see up into the upper area towards the existing ceil¬ ing. On top of these so-called grid ceilings there may ad- vantageously be arranged cooling installations or combined heating and cooling installat ons, in the latter case the installation for emission of heat functioning as a radiation unit and for the emission of cool air as a convection unit. However, it is extremely common for the false ceil- ings to consist of prefabricated modules which are supported by a visible support framework, preferably of the T-section type. It is also common to suspend finished false ceiling modules in a visible support framework which functions as a cable ducting false ceiling, in which connection the modules serve for lighting or sound absorption. In this connection it has been found that there is a very considerable require¬ ment to be abue to remove one or more modules and replace them with a cooling installation or heating and cooling in¬ stallation which has the same or essentially the same format as the module removed and which, in an aesthetic manner, goes well with. the other parts of the false ceiling.

Technical problem:

If a heating or cooling installation or a combined heating and cooling installation of a conventional type is arranged on top of such a false ceiling of the type just men¬ tioned, the coot air or heat emitted is interrupted or elim¬ inated by the panels of the false ceiling, in which connec¬ tion an ovei—dimensioning is required or the desired fuπc- tioπ completely or partly fails to occur. Furthermore, such an installation involves -a not inconsiderable working moment and requires a large space.

Solution: The problem of obtaining an unimpeded route for heat or cool air from a heating or cooling arrangement arranged in a ceiling is solved according to the invention by the ar¬ rangement comprising a sheet-like element having a number of openings with a defined flow area, a housing arranged on the

element and in turn comprising an opening which is connected to at least one of the said openings of the element, a finned element which is arranged in the said housing and which is arranged at a distance from the plane at which the housing bears against the said element, and the element comprising a heat-conduc ng elongate conduit.

Advantages :

The invention provides a heating or cooling arrange- ment by means of which emitted cool air or heat can be passed unimpeded out into the room, and which has a predetermined outer format and is designed to be used as a replacement module on false ceilings.

Description of figures:

The invention will be described in greater detail below on the σasis of an exemplary embodiment and with ref¬ erence to the attached drawings in which Fig. 1 shows the arrangement in a perspective view, Fig. 2 shows the arraπge- ment arranged on a false ceiling seen from below, and Fig. 3 shows a partly broken section of the arrangement in Fig. 1.

Preferred embodiment:

The invention will be described below on the basis of an exemplary embodiment which does not, however, consti¬ tute a limitation to the scope of application of the inven¬ tion. As shown in Fig. 1 the arrangement comprises a convec¬ tion housing 1 which in turn comprises an upper, box-shaped part 2 and a lower part 3 whose sides are set at an angle relative to the sides of the upper part 2, in which con¬ nection the sectional area of the lower part 3 increases with the distance from the upper part -2, so that the Lower part essentially has the shape of a truncated cone. Another configuration of the lower part 3 is of course possible. Thus, for example, the lower part can entirely follow the side walls of the upper part and form extensions of these or have a box shape with walls which project at right angles from the Lower edge section of the upper part and turn down at a distance from this in order to connect with the top

side of the radiation element 12. The upper part 2 sur¬ rounds a lamina tube heat exchanger 4 comprising a number of sheet-like laminas 5 arranged alongside each other and parallel to each other, preferably made of aluminium, although another alloy or metal is also conceivable. The sheet-like laminas 5 may be, but not necessarily, in contact with the wall sections of the upper part 2, which sections surround the lamina tube heat exchanger 4. The sheet-like laminas are connected to each other by means of at least one tube 6 extending through the upper part 2 preferably in a serpentine pattern, which tube runs through holes 7, 8 in at least one of the end walls 9 of the upper part and through the sheet-like laminas 5. The tubes 6 are preferably in metallic contact with the laminas by means of the former having been expanded in the holes 8.

The outer edge line 11 of the lower part 3 bears against an upper surface of a sheet-like, rectangular radiation element 12, preferably made of aluminium or sheet steel, and which has a number of openings 13 which have a circular or square shape or are in the form of a slot pattern in panels. A covering material through which air can readily flow, such as a screen, may be arranged in the openings 13.

The convection housing 1 is positioned in such a way that it preferably assumes a central position on the radiation element 12, in which connection the lower part of the convection housing covers a certain predetermined part or number of the openings 13 of the radiation element 12, there being formed, by means of the lower part between the lower side of the lamina tube heat 'exchanger 4 and the upper side of the radiation element 12, a convection chan¬ nel 14 whose height is dependent on the predetermined effect of the cooling arrangement and the flow area of the openings 13 of the radiation element. As shown in Figs. 1 and 3 an elongate tube 15 runs along the outer edge lines of the radiation element and along the lower part of the convection housing in contact with the radiation element, which tube is designed as a carrier of a heating medium. The tube 15 is brought into

contact with the top side of the radiation element 12 by means of clips or another type of fixing element. It is also conceivable for the outer edge sections of the radia¬ tion element to be bent over the tube 15 in such a way that the Latter comes into heat-conducting contact with the radiation element.

As shown in Figs. 1 and 2 the arrangement according to the invention is designed to be arranged as a module in a support framework which is visible from underneath and is made up, for example, of a T-section 18, the radiation ele¬ ment being expediently arranged in the T-section as shown in Fig. 1.

It is also conceivable for the arrangement according to the invention to be arranged in false ceilings which have a support framework of cable ductings essentially having the form of a U-section, the radiation element having hooks ex¬ tending out from the edge sections of the element and not shown in the drawings, in which connection the arrangement according to the invention is hooked firmly on the edge ^' sec- tions of the cable ductings.

When using the arrangement according to the present invention for heat absorption, cooling water is allowed to flow from a central cooling system, at a. temperature of pre¬ ferably 6-10°C below the room temperature, through the tube 6, in which connection the sheet-Like laminas 5 of the lamina tube heat exchanger 4 are cooled by means of the tube being in contact with the laminas. In this way the air flowing through the lamina tube heat exchanger is cooled, the density of the air increasing. When the density of the cold air increases, the air which is present in the lamina tube heat exchanger descends through the convection channel 14 and out in the direction of the arrow 19 through the holes 13 in the radiation element 12. Intake air to the con¬ vection housing flows up in the direction of the arrow 20 through the openings 13 of the radiation element 12 which are located outside and alongside the lower part 3 of the convection housing. In this connection the flow of intake air passes along the sides of the convection housing and is brought into the Lamina tube heat exchanger for cooling, a

new cooling cycle thus beginning. Air for cooling is of course also taken from air which is supplied to the convec¬ tion housing by means other than through the openings 13, such as through existing openings in the false ceiling. When the arrangement according to the present in¬ vention is used for heat emission, the supply of cooling water from the central cooling system to the tubes 6 is throttled, and hot water is supplied to the tubes 15 from a central hot-water system. Since the tubes 15 are in heat- conducting contact with the radiation element 12 and the latter is of a heat-conducting material, the heat is passed through the tube wall to the radiation element which is heated and emits heat to the room by means of radiation. The invention is not limited to the exemplary em- bodiment described here and shown in the drawings, but can be varied within the scope of the subsequent patent claims. Thus, for example, the radiation element can be made narrower, in which connection its openings which lie in the radiation element beyond the bearing of the convection housing against the radiation element are eliminated. By this means the in¬ vention is specially adapted to false ceilings having a sup¬ port framework of cable ductings, in which connection intake air can be taken up without limitations through existing openings in the false ceiling. The radiation element can also be made of a material with poor heat conduction, such as wood or plastic material, the tubes for carrying the heat¬ ing medium expediently being excluded.