FR2466709A1 - METHOD AND INSTALLATION OF AIR HUMIDIFYING FOR AIR CONDITIONING OF PREMISES - Google Patents

Abstract

The invention relates to a method and to an air humidification installation for the air conditioning of premises. It relates to an air humidification method, according to which the air is humidified in two stages arranged spaced apart in the direction of flow. From humid air, in the first humidification stage I are separated the drops whose size exceeds a determined value, and then in the second humidification stage II, the moisture content of the air is increased compared to the moisture content of the air escaping from the first humidification stage I. Application in particular to the air conditioning of premises. (CF DRAWING IN BOPI)

Description

I

  The present invention relates to a humane process

  air midification for the air conditioning of premises,

  according to which the air is humidified in two floors

  spaced in the direction of flow, and an air conditioning system equipped with two humidification stages spaced in the direction of flow of air. In the case of air conditioning installations

  equipped with long air ducts, a reduction in

  the moisture content of the air appears by

  pardition of drops of water along the flow path.

  In order to reduce the moisture content of the air to the

  their initial, that is to say in order to cover again the losses caused by separation of drops, it is known

  to provide a second humidification stage, which is dis-

  at a certain spacing, as a general rule

  ble, of the first humidification stage. Because of the

  important pacerment between the humidification stages,

  the air near the second floor of humidi-

  cation does not result in large drops of water,

  the droplets of water generated in the se-

  cond humidification stage could be fixed.

  The present invention aims to propose

  a process or installation of air-conditioning

  of the type indicated in the high-performance preamble, by which, in a simple way and with minimal energy expenditure, a high degree of saturation and even

  an oversaturation of the air can be obtained.

  This problem is, according to the method of the invention, solved by the fact that humidified air in the first humidification stage is separated the drops whose size exceeds a determined value, and by the fact that subsequently in the second humidification stage, the moisture content of the air is increased with respect to the moisture content of the air leaving the first stage

  humidification. In accordance with the installation of

  vention) the problem is solved by the fact that between the humidification stages is disposed a drop separator which separates the drops whose size exceeds a determined value and that in the second humidification stage a increase

  the moisture content of the air is effected by

  the moisture content of the air leaving the first

first stage of humidification.

  In the first stage of humidification, dars

  which drops of water of different sizes

  In a wide range are generated, that is to say, very fine drops as large drops, a pre-humidification occurs, thanks to which the moisture content of the air is brought to a first value, for so to say to a fundamental value. In

  the second humidification stage in which a pulverulent

  When the water is formed, the moisture content of the air is increased to a second value. As in this second humidification stage, practically only a posthumidification is still necessary, which is established at the moisture content of the air in the first humidification stage, the fine spraying can be carried out

  with a relatively low energy requirement. Thus,

  depend on the physical properties of the air entering the Dremier humidification stage, air to

  high saturation and supersaturated can be generated without

  energy and major equipment.

  In the droplet separator, all the drops

  Ye contained in the air leaving the first floor of humidi-

  are separated, the size of which exceeds a

  their determined and on which the fine water droplets generated in the second humidification stage could be deposited. It is thus avoided that in or behind the second humidification stage, fine water droplets, which are desired for humidification and cooling of the air, are lost. In addition, undesirable deposition of drops of water on the walls of air channels is prevented. The fine water drops generated in the first stage of humidification, of which

  presence is desirable in the airflow,

  pour the drops separator. In contrast to the known solution indicated in the preamble, the spacing between the humidification stages can be kept relatively small, since no long separation path for large drops should be provided. We can thus obtain an overall length of

the short installation.

  A particularly advantageous procedure is obtained if the spacing between the first humidification stage and the droplet separator is greater.

  large, preferably at least double, that the space-

  between the droplet separator and the second humidification stage.

  In a preferred embodiment, the

  positive water spray of the first stage of humi-

  at least one fan wheel

  supplied with water. Thanks to the use of the sales wheel

  tilator, a simple and compact mode of execution is

  held for both air transport and water spraying. In support of the last-mentioned purpose, it is furthermore advantageous that the separator of

  drops serve simultaneously as a flow straightener.

  An example of realization of the object of the in-

  tion is explained below in detail in relation to the

  annexed figure whose single figure shows a long section

  schematic tudinal the section containing the floors

  humidification of an air conditioning system.

  In the figure, the reference number 10

  a pipe or channel section which has an intake nozzle 12 at its inlet end. In the flow direction A, behind the inlet nozzle 12 and close thereto, the tube 10 presents

  a U-shaped portion 14 in section, which fixes a chamber

  ann ring 16steniat around the pipe section 10.

  This annular chamber 16 has a discharge aperture

  directed towards the inside of the tube section 10 under

  the shape of an annular slot 16a. This or these openings

  Outputs may, however, also take another form. In the annular chamber 16 open two water pipes 18 and 20, which are connected to the

  the discharge side of a water pump 22. The side of

  This pump 22 is connected to the cover 24 of a basin 26. This basin 26 is provided in known manner with an overflow tube 28. In the vicinity of the annular chamber 16 is disposed a fan wheel 30

  equipped with blades, which is driven by a motor 32.

  With this fan wheel 30, the air to be treated is sucked by the intake nozzle 12 and transported through

  the tube section 10. Upstream of the fan wheel

  30, that is to say on the wind side thereof,

  opens out near the hub 30a of the fan wheel.

  water pipe 34, which is also

  connected to the discharge side of the water pump 22. A plurality of water pipes opening near the hub 30a

can also be planned.

  At a distance from the fan wheel is disposed downstream thereof, a droplet separator 36 whose flow tube 38 opens into the basin 26. The water separated in the separator 36 flows, like this is indicated by the arrow 40, to

  through this flow tube 38 in the sheet 24.

  The drop separator 36 is preferably also made as a silencer. In addition, it is advantageous to make the drop separator 36 simultaneously as a flow rectifier. This combination of drops separation and straightening

  flow in the same constituent provides the advantage

ge of a compact execution mode.

  Downstream of the droplet separator 36 is arranged

  a second humidification stage II, which has a certain

  number of binary spray nozzles 42, which are arranged uniformly distributed around the periphery of the pipe section 10. These binary nozzles 42 forming the second humidification stage II are arranged at a distance from one another.

  relatively small distance from the droplet separator 36.

  This distance between the drop separator 36 and the

  spray nozzles 42 is smaller than the disc

  between the blower wheel 30 belonging to the first humidifying stage I and the drop separator 36. The spacing between the blower wheel and the drop separator 36 is at least twice as large, generally multiple of the distance between the droplet separator 36 and the spray nozzles

42 of the humidification stage II.

  Each binary nozzle 42 is, via a pipe 44, connected to a source of compressed air 46 and via a second pipe 48 to a pressurized water tank 50. This water tank 50 can be formed by the local water distribution network. The pressurized water tank 50 is connected through another pipe 52 to the basin 26. In the pipe 42 is disposed a valve 54

  actuated by spring of known realization, In the cases

  44 and 48 are also inserted

  pes 56 and 58 of known construction, which are ordered

  together with the water pump 22 in itself

  This control 60 is connected to a hygrostat 62. During the operation of the air-conditioning system, the rotating fan wheel causes the ambient air to flow.

  through the intake nozzle 12 and displaces this

  it through the pipe section 10. The water pump 22 conveys, via the pipes 18 and 20 of the water in the annular chamber 16. The water escapes through the annular slot 16a under the in the interior of the tubular section 10. This film of water is put in turbulence and diffracted by the blades of the fan wheel 30, so that drops of water

  form with a spectrum of very fine droplets

  than large drops of water. The different sizes of drops therefore cover a very wide range. For certain operating conditions

  and air inlet, this spraying of the water

  both of the annular slot 16a by the fan wheel is sufficient. If necessary, the water can also be guided via the water pipe 34 near the hub 30a. Water leaving the pipeline

  34 is diffracted by the blades of the fan wheel

  30 as a result of shear forces and is sprayed

  ripe in very fine droplets and drops of

big size.

  The air brought to a determined moisture content in this way in the first humidification stage I passes through the humidifying path zone between the blower wheel 30 and the droplet separator.

  36. Air flowing through this water separator

  36, drops of water too large, that is to say drops of a size exceeding a predetermined value, are separated and are returned by the flow tube 36 to the basin 26. In the droplet separator 36, only

  large drops are selectively separated, on the

  which net droplets of water could easily

  which are necessary for humidification and cooling of the air. These little droplets

  desired water can pass unimpeded through the sepa-

  As already mentioned, the separator

  drops 36 can also be used for the recovery of

  air flow, that is to say, the elimination of rotation

  supply air. The already pre-moistened air reaching the second humidification stage II is supplied by the nozzles

  binary sprays 42 with a cloud of water which

  holds very small droplets of water. Thanks to these, the moisture content of the air is increased by

  relative to the moisture content of the air leaving the first

  1st stage of humidification I. Thanks to this increase in the humidity of the air, a high saturation or even an oversaturation of the air is obtained. Contrary to

  first stage of humidification I, the spectrum of

  of water produced in the second stage of humidification

  cation II is very narrow. Preferably the "Sauter diameter" characterizing the droplet spectrum of the second

  humidification stage II with the "Sauter diameter"

  risking stage I lies in the ratio of about 1:10.

  As we know, the Sauter diameter is used in

  the technique as a fundamental designation variable

  tale for the quality of a spectrum of drops.

  With the two-stage humidification described, it is possible to obtain highly saturated and supersaturated air independently of the physical properties of the air entering the intake nozzle 12. Humidification

  in the first floor I creates an initial situation

  favorable for the humidification operation in the

  second humidification stage II. Like during the humidi-

  in this second stage II, we can start from a

  in the fundamental humidity of the air, the need for energy

  for spraying in this second stage of humidification.

  relatively low cation. Thus, the air is highly

  saturated and supersaturated can be generated with a need for energy

  overall relatively low for all conditions

air inlet.

  It will be realized that the installation of air conditioning

  described above may be carried out in different

  your versions other than the one shown. - Thus, in the first humidification stage I, each suitable water spray device can

  to be used, which is able to generate

  necessary quantities with the spectrum of

  you wanted. The air transport fan can also

  should be arranged separately from the spraying device

  tion. The described use of the fan wheel carrying air for the purpose of spraying water

  However, it has the advantage of allowing a mode of e-

simple and space-saving.

  Instead of binary nozzles 42, can be used

  in the second spraying stage II,

  other types of spray nozzles, for example high pressure nozzles. It goes without saying that in the

  second stage of humidification II, pulleys

  fine tuning of any suitable water may

to be used.

  Where appropriate, each of the humidification stages

  I and II may consist of two or more partial stages. Thus, for example, several rows of spray nozzles 42 may be arranged in the flow direction A. In a preferred embodiment, the separation baffles (sheets) of the drop separator 36 are formed hollow and a coolant

  appropriate is introduced into these cavities.

Claims (12)

  1 - Method of humidifying air with a view to   air-conditioning of premises, according to which the air is humidi-   in two stages spaced apart in the direction of   flow, characterized in that humidified air in the first humification stage (I) is separated the drops whose size exceeds a predetermined value,   and that afterwards in the second stage of humidification   (II), the moisture content of the air is increased relative to the moisture content of the escaping air   the first humidification stage (I).   2 - Air conditioning system equipped with   two humidification stages spaced in the direction of e-   flow, characterized in that between the   humidification (I, II) is arranged a separator   of drops (36), which separates the drops   whose size exceeds a certain value and that in the second humidification stage (II) a   increase in the moisture content of the air is ef-   made in relation to the moisture content of the air   from the first humidification stage (I).   3 - Air conditioning system according to the   claim 2, characterized in that the spacing between the first humidification stage (I) and the droplet separator (36) is greater, preferably at least twice the spacing between the droplet separator   (36) and the second humidification stage (II).   4 - Air conditioning system according to the   2 or 3, characterized in that the second   humidification stage (II) comprises at least one   sitive (42) fine spray of water.   - Air conditioning installation according to claim 4, characterized in that the fine water spray device comprises at least one spray nozzle (42), preferably a binary nozzle or high pressure.   6 - Air conditioning system according to the   5, characterized in that each spray nozzle (42) is in communication with a source of compressed air (46) and a source of water under pressure (50).   7 - Air conditioning installation according to   Claims 2 to 6, characterized in that the   first stage of humidification (I) comprises a provision   spraying agent (16,34), which generates water drops of different sizes distributed throughout the a wide beach.   8 - Air conditioning system according to the   7, characterized in that the device for   water spraying comprises at least one winding wheel tilator (30) supplied with water.   9 - Air conditioning system according to the   8, characterized in that the fan wheel   water (30) is supplied with water at its periphery.   - Air conditioning system according to the   9, characterized in that an annular chamber   the wall (16) surrounding the fan wheel (30) is provided, into which at least one pipe   water supply (18,20) and which comprises at least one   outlet opening (16a) directed towards the fan wheel (30).   11 - Air conditioning system according to the   10, characterized in that the opening of   outlet is formed by an annular slot (16a).   12 - Air conditioning system according to the   claim 10, characterized in that the water supply pipe (18, 20) is connected to a reservoir (26) into which the outlet (38) of the separator drops (36).   13 - Air conditioning system according to the   8, characterized in that the water spray device comprises at least one water supply pipe (34) opening near the hub (30a) of the fan wheel (30). 14 - Air conditioning installation according to   Claims 2 to 13, characterized in that the sequence   drop dispenser (36) is made in the manner of a current rectifier.   15 - Air conditioning installation according to a   Claims 2 to 14, characterized in that the   droplet separator (36) is made in the manner of a silencer. 16 Air conditioning installation according to   Claims 2 to 15, characterized in that the   separation baffles of the drop separator (36) disposed in the air flow are provided with cavities   in which there is a cooling fluid.