FR2557275A1 - METHOD FOR REMOVING COLD AIR INFILTRATIONS THROUGH OPENINGS SUCH AS MAIN ENTRANCES, INDUSTRIAL BUILDINGS ESPECIALLY - Google Patents

Abstract

THE INVENTION RELATES TO A PROCESS FOR PREVENTING THE INFILTRATION OF COLD AIR FROM THE EXTERIOR THROUGH OPENINGS, SUCH AS MAIN OR SIMILAR INPUTS, IN INDUSTRIAL BUILDINGS. THE PROCESS CONSISTS OF USING A JET OF AIR, PARALLEL TO THE MAIN DOOR AND TO THE EXTERIOR OF THE latter, SO THAT IT ACTS AS A BARRIER OPPOSING THE ENTRY OF COLD AIR FROM THE EXTERIOR ; THE INVENTION ALSO CONCERNS AN APPARATUS FOR IMPLEMENTING THE PROCESS, THIS APPARATUS INCLUDING, OUTSIDE THE INLET 1, A SUCTION TUBE 3 PLACED ON ONE SIDE OF THE INLET, AN EJECTION TUBE 4 PLACED ON THE OPPOSITE SIDE, THESE TUBES 3, 4 BEING CONNECTED TO ONE HIM BY A CENTRIFUGAL FAN 5.

Description

The present invention relates to a method for eliminating

  infiltration of cold outside air through openings, such as main entrances or the like,

in industrial buildings.

  More specifically, the method according to the invention aims to prevent heat dissipation by introducing an excessive amount of outside air, by means of a barrier preventing the cold outside air from passing through the room. main entrance (open) of a building and

  circulate inside of it.

  The problem of reducing energy consumption and improving indoor comfort in homes is very important, also in consideration

  because the cost of fuel is continually increasing

is lying.

  This problem is particularly noticeable in the case of industrial buildings, where the presence of large entries that can be crossed by vehicles results in

  strong heat dissipation as a result of the increase in

  natural air intake; there are also climate problems caused by

  outdoor air infiltration in residential volumes.

  In fact it often happens that in the buildings

  industrial entries, large entries, such as main doors, wagon or similar passages, entries which must always remain open to allow the passage of vehicles or the loading and unloading of

  goods with respect to said vehicles.

  It is obvious that under such conditions, a huge amount of heat is consumed because of the cold air flow that tends to penetrate, through

  through these entrances, inside the building.

  To overcome the aforementioned drawbacks, many different solutions have been proposed. In

  In some cases, warm air is intentionally

  by means of orifices placed on the inner side of the volumes themselves, in particular on the part

upper doors.

  This system, used for example in department stores, however, results in a high energy consumption because it ensures the heating of the incoming air but it is unable to prevent the

heat dissipation.

  A second, more recent solution is to provide devices to ensure that the hot air accumulates, by suction effect, in the upper area of the building, the air then being discharged, by means of one or more fans placed one behind the other, so as to pass at high speed through an opening in the floor of the building, parallel to the main entrance, thereby forming a jet of air in the shape of a cylinder.

  inverted corresponding to an angle of about 15.

  In reality this system consists of drawing hot air into the upper part of the building and

  to push back at high speed towards the main entrances

  blades, thus using the heat that accumulates in the

  upper part of the volumes to heat the jet of air.

  This system, however, also has many disadvantages. In fact, a large mass of air ejected through the opening exits the building, dissipating a significant amount of heat. In addition it happens that a certain amount of cold air is sucked inside the building by other openings existing in it, thus compensating for the hot air that was previously sucked in and that dissipated heat outside. In the case of wind, or doors

  very high, the air jet weakens in the upper part of the

  higher, allowing the admission of cold air or an excessive ejection of hot air. To overcome the drawbacks mentioned above, the object of the present invention is to create a process using outside air to create a double-acting barrier which prevents cold air from

  enter the building.

  Other features and advantages of the invention will be highlighted later in the

  description, given by way of non-limiting example, in

  1 is a perspective view of devices for carrying out the method according to the invention, FIG. 2 is a sectional view of the devices of FIG.

figure 1.

  In the vicinity of an opening 1 (such as for example a main door or the like), there is provided in the wall 2 of an industrial building an apparatus which comprises a horizontal upper tube 3 and a vertical tube

  4 which are interconnected by a fan 5, preferably

  Centrifugal chamber, driven by an electric motor 6 or the like. The tube 4 is connected to a third tube 7

  placed below the floor of the building.

  The tube 3, which extends over the entire length of the opening 1, is provided at its lower part with a

  orifice 8 extending over the entire length of the tube.

  The tube 5 communicates with the outside through a fine ventilation hole 9, inclined as illustrated in FIG. 2. The centrifugal fan 5 draws air from the tube 3 and delivers it into the tubes 4 and 7. From the tube 7, the air exits at high speed through the ventilation hole 9, thus creating an air jet directed upwardly along a plane which is increasingly spaced from the building wall as you move upward. The orifice 8 provided in the tube 3 has a larger dimension than the ventilation hole

9 provided in the lower tube.

  The speed of the air coming from the ventilation hole

  9 decreases more and more as this air rises above the ground and the air is again sucked by the fan 5 through the orifice 8 of the tube 3

to be recycled later.

  This produces a continuous circulation of outside air that acts as a barrier to prevent or at least significantly limit cold air infiltration into the building. In addition, in the upper zone o the jet of air admitted is lower, a second ventilation hole, maintained at a constant depression, draws outside air - possibly existing - which

  would otherwise tend to be introduced, for example

  ple under the effect of the wind. The set of devices described above is placed outside the building, without any use

of thermal energy.

  Several tests have proved that in

  the orifice 8 and the ventilation hole 9 in relation to the dimensions of the main door, the quantity of air which passes through the infiltration is reduced to

  minimum and is in any case sucked by the fan 5.

  The above description clearly shows

  that the method according to the invention is to create, near the main entrance of a building and outside thereof, a barrier for cold air so as to constitute an effective obstacle for the outside air

  tending to enter the building.

  This air is preferably sucked on a side of

  the opening and it is pushed back on the opposite side.

  Naturally, the invention is not limited to the embodiments described above and represented, from which other modes and other embodiments can be provided without, for that reason, going out of

framework of the invention.

Claims (5)

  1. Method to prevent infiltration   outside air through the entrances of a building,   tered by creating, on the outside of the building, a forced circulation of air sucked on the outside of the building so as to generate, close to the entrances, a suitable barrier to prevent the infiltration of outside air . 2. Method for preventing infiltration   outside air through the entrances of a building,   characterized in that it comprises the following steps: a) drawing outside air to one side of the inlet to be insulated; b) subsequent discharge of said air, at high speed, on the opposite side so as to propel the air towards the suction zone, and thus create a suitable barrier to prevent the infiltration of cold air from outside.   3. Method according to claim 2, characterized in that air is ejected at high speed along a slightly inclined plane to push it outwards. 4. Apparatus for the implementation of the method   according to any one of claims 1 to 3, characterized   in that it comprises, outside the inlet (1), a suction tube (3) placed on one side of the inlet proper, and an ejection tube (7) placed on the opposite side, said tubes (3, 7) being interconnected   by means of a centrifugal fan (5).   5. Apparatus according to claim 4, characterized   in that the existing orifice in the ejection tube   tion (7) has smaller dimensions than the orifice   existing in the suction tube (3).