SE523772C2 - Air diffuser device provided with window apparatus which has a curved, convex surface provided with very small holes - Google Patents

Abstract

The present invention relates to an air spreading device for fresh outdoor air ducts, designed to introduce fresh air into the rooms in a building. The device is designed to be mounted in front of a fresh air duct, which has an opening close to the interior side of a window, preferably in or on a window board below a window and above the opening of a window apparatus, which opening is directed upwards, which air spreading device has a curved surface with openings, through which air jets are spread in a direction, which is perpendicular to the respective opening, the air spreading device being designed to prevent draughts from occurring also at low fresh air temperatures, energy being saved in this way. The curved surface (Y) of the spreading device (1) is substantially completely provided with very small holes or slits, which are smaller than 5mm, the air with a relatively low temperature, preferably 10-18 DEG C, preferably having a flow speed per meter window of about 5-15 1/s per meter window, the introduced fresh air being spread through the openings (0) in several hundred jets, in diverging directions into the room, subsequent to which an admixture into the warm room air will be done at a very short distance from said convex surface (Y).

Description

523 772 Ö 4 .. high, occurs in the window device and whereby the particle content in the residence area becomes relatively high. The driving forces of this secondary flow are created by the primary air flow through ejector action.

The air from the window devices to the rooms is directed upwards and is given a pulse up through an opening in the window sill, which is usually rectangular. The air then flows up along the window and can to some extent be regulated by the grid, grid or the like which is usually in sheet metal or plastic being angled or inclined in different directions in the upward direction of the air flow. The grilles or grids of the window sills can also only be screen-delimiting and a protection against things falling into the window devices.

The window devices impulse direct the air upwards through the above-mentioned grille up after the window towards the ceiling and then the air flow reaches the space above the living area and towards exhaust air openings which are often located above the ceiling, which means that the air usually flows next to the living area. If the air is overheated, which is normal, the thermals give an additional rising force to the air towards the roof and in the living area the air exchange is low. The primary ventilation up to the ceiling creates a vortex in the room where old air from the corridor fills the room along the floor and makes up a large part of the air at the workplace.

If you lower the temperature of the air flow through the window device, the air will instead deflect after reaching a certain height up along the window. This is because the weight of the cold air along the window will bring the air down to the floor. A cool air flow from the window device through the above-mentioned grille thus does not mix with the room air but causes a draft feeling and draft along the floor.

The air velocity through the nozzles in a window device is usually high to create the negative pressure required to enable co-injection of the room air. The high speed causes a high noise level which over time can develop into disturbing tones of dust and dirt accumulated in the window device due to co-injection of room air from floor level and due to the upwardly open grille.

The window devices are also difficult to clean and the cassettes with the window devices therefore collect dust and other debris, which partly follows the air upwards.

This is a health problem as the window devices in this way actively help to keep dust particles floating in the air.

Brief description of the inventive object The present invention has for its object to obviate the above-mentioned disadvantages of window devices and to provide a diffuser device which spreads supply air with a significantly lower temperature than usual, efficiently from a window device under a window past a workplace while being called from the window. occurs even at low temperatures in the supply air.

According to the idea of the invention, the above-mentioned problem is solved by said spreader device having a curved, convex surface which is substantially entirely provided with very small holes or slits which are less than 5 mm, the air with a relatively low temperature, between 10-18 degrees, being spread with many jets in diverging directions into the room with each jet of air perpendicular to the opening in the curved surface and then mixing in room air at a very short distance from the convex surface, that the spreader device has an asymmetrical design with the highest point of the convex surface (arrow height) ( 10) on the part closest to the window (2) and is provided in this curved surface with at least one larger hole or slot (8) in the part facing the window. This allows the supply air temperature to be low without reducing comfort as the excess heat in the room of normal operation and of lamps, computers and the like. can be used.

In accordance with the idea of the invention, a device is further obtained which is easy to apply on top of various window devices in window benches, which enables the air flow to the room to be reduced and thus provide a pleasant indoor climate, reduce co-injection of air around the window devices, deliver finely divided supply air to the rooms which are thus easily mixed with the room air and flow into the room without drafts but the feeling of fresh air is experienced.

Brief description of the accompanying drawings Figure 1 shows a first embodiment of the invention in a window sill with a built-in window device seen in cross-section from the side.

Figure 2 shows only the invention mounted in a window bench according to figure 1, seen from the side.

Figure 3 shows another embodiment of the invention mounted in a window sill, seen from the side.

Detailed description of a preferred embodiment of the invention Figure 1 shows on average how a window device 4,5,6 is placed under a window 2 and which is connected to a ventilation duct 7 which runs on the inside of the facade wall of the house with a detour to the window devices 4,5 , 6 under the windows.

The window device can be equipped with heating and cooling batteries in order to be able to adjust the supply air temperature with a room control before it is blown into the room.

The air to the room is directed upwards by nozzles 5 and then passed through the opening 3 in the window sill B. Above the opening 3 the air diffuser 1 is mounted to spread the supply air from the window device 4,5,6 up past the window 2 past the workplace which is usually near the window with a table part at an angle to the window 2. The air diffuser 1 consists of a perforated plate with very small openings whose size is a few millimeters large and which has a curved, convex surface seen from the room, which is shown in more detail in figure 2 where the air diffuser is shown from the side in vertical view it is shown how the air jets 9 radiate out into the room at a 90 degree angle from each individual hole in the 525 772 arched surface.

Figure 3 shows the air diffuser 1 seen from the side in the same way as in Figure 2, but here it has an asymmetrical shape with an arrow height 10 offset towards the window 2. At the area of the air diffuser towards the window a larger opening 8 is arranged, which gives less flow resistance and thus a greater air fl destiny per unit area than through the rest of the air diffuser 1. When this fl destiny through the opening 8 is directed towards the window 2 and gives this fl destiny a greater counteracting of cold drafts or drafts from the window.

The curved shape of the air diffuser 1 is a prerequisite for the supply air to be distributed over a larger angle towards the room since the air flow through the holes is directed perpendicularly from the surface of the invention. The perforation with many small openings in the surface is a prerequisite for a cold supply air to be mixed into a warm room air by spreading many jets of cold supply air into the warmer room air.

It is of great value that the supply air can maintain a low temperature. The excess heat in a normal office room is transported out of the room with the ventilation fate and the supply air can be heated centrally by recovery with heat from the exhaust air. This is sufficient to heat the supply air even if the efficiency of recycling is limited. The result is a ventilation system that does not require any addition of primary heat to the rooms or the building. No co-injection of room air through heating and the cooling batteries is no longer needed. This airway can be closed in existing window devices. If the excess heat in the room is utilized in this way, a possible cooling need during the hot season is also reduced.

The scattering image of the supply air can be varied by means of the temperature thereof.

The heat sources on the work table and the personal heat cause the air to rise to the ceiling and then take with it pollutants in the form of carbon dioxide, odors, moisture, etc. The dust from textiles etc. lays down against floors and low-lying horizontal surfaces, which is why cleaning gradually reduces the presence of dust in the room. The air in the room becomes significantly freer from particles at breathing height in the room. The exhaust air often has a temperature of 22 degrees when it reaches a central heat exchange unit, so no extra heat is needed for heating the supply air, which preferably has between 10-18 degrees, which is significantly lower than normal temperatures of supply air via window devices of up to 25 -30 degrees. This means that energy costs can be kept to a minimum.

Claims (2)

523 772 PATENT REQUIREMENTS An air diffuser device arranged in window devices (also called induction devices) which are used to supply mechanical supply air to rooms in a building, the device being intended to be placed in or on a window sill (B) under a window (2) and over a window device (4 , 5, 6) and over its air duct mouth (3) which is directed upwards and wherein the window device (4,5,6) is connected to a ventilation duct (7), characterized in that the spreading device (1) has a curved, convex surface (Y) which is substantially entirely provided with very small holes or slits which are less than 5 mm, the air with a relatively low temperature, between 10-18 degrees, spreading with many jets (9) in diverging directions into the room with each jet of air (9) perpendicular to the opening in the curved surface (Y) after which a mixture in room air takes place at a very short distance from the convex surface (Y), that the spreading device (1) has an asymmetrical design with the highest point of the curved surface (arrow height ) ( 10) on the part closest to the window (2) and is provided in this curved surface with at least one larger hole or slot (8) in the part facing the window. Air diffuser device for window devices according to claim 1, characterized in that the curved surface (Y) consists of fl your flat surfaces which are joined to each other at an angle to each other.