FR2516212A1 - METHOD AND DEVICE FOR COOLING THE PARTS OF A BUILDING - Google Patents

Abstract

THE INVENTION RELATES TO A PROCESS FOR COOLING THE ROOMS OF A BUILDING AS WELL AS AN APPARATUS FOR IMPLEMENTING THIS PROCESS. IN THE DEVICE, THE INLET DUCT 2 FROM THE AERATION STATION, CONTAINING A FLOW REGULATOR 5, AND INTENDED FOR COLD PRIMARY AIR ENDS IN A PRESSURE CHAMBER 4 OF AN INDUCTION UNIT 1 FROM FROM WHICH THE NOZZLE-SHAPED OUTPUT OPENINGS 10 ARE DIRECTED INTO AN EXHAUST CHAMBER 11. EXHAUST CHAMBER 11 IS FURTHER SURROUNDED BY A SUCTION PART 16 FOR SECONDARY AIR WHICH IS EQUIPPED WITH AT LEAST ONE SUCTION PORT 13 INTENDED FOR AMBIENT AIR. THE MIXING OF THE PRIMARY AIR AND THE ROOM AIR BEFORE ENTERING THE ROOM 15 TO BE COOLED ALLOWS THE USE OF LOWER PRIMARY AIR TEMPERATURES. AS A RESULT, FOR THE SAME THERMAL DISSIPATION, MUCH LOWER QUANTITIES OF PRIMARY AIR ARE USED AND THAT THE VENTILATION INSTALLATION IS SMALLER AND MORE COMPACT. APPLICATION TO AIR CONDITIONING TECHNIQUES.

Description

The invention relates to a method for cooling

  individual drainage of rooms in a building using a central ventilation system which supplies the necessary air for the renewal of the air and for its humidification, as well as for the cooling of rooms,

  different parts from a processing facility.

  of air, in the form of cooling air having a constant temperature being much lower than the

  room temperature, the amount of incoming cold air from the

  more than the minimum amount of air / for the

  regulation of the cooling power being

  The invention relates to a room thermostat

  also a device for implementing the method.

  The process described above is known for example

  Swiss patent 555,519; adaptation of the "cold" brought about in this patent by a regulation of the amount of treated and cooled primary air from the aeration system The cold primary air is preferably directly blown into the room in the vicinity

  ceiling and mixes with the ambient air alone.

  after being released into the room because of the effect

induction of its "radiation".

  Practice has shown in these processes or

  known cooling temperatures that the temperature con-

  primary air intake or blown air intake should be maxinu only 8-100 C below the ambient temperature which is about 26-280 C, if we do not want to decrease the

  comfort of the occupants of the room, because otherwise the

  primary air, especially when the cooling

  is not necessary> is so weak that it "falls" in

  the room without much induction effect and without sufficient mixing

  with the ambient air and forms near the ground

Islands of cold air.

  As a result of this comfort requirement, relatively large amounts of primary air are

  necessary to have the maximum cooling power

  required, but this requires significant expense and space for the ventilation

primary air.

  The problem of the present invention is to modify

  the known cooling process on the basis of variable quantities of primary air, so that the expenditure on installation and energy required to provide the maximum cooling power required is reduced. The device for implementing the new

  The process must also fulfill the marginal condition

  in that the ratio of primary air to air

  secondary or ambient armature must remain approximately constant

  for all variable amounts of primary air

  in the arrival air blown into the room.

  According to the method of the present invention, this problem is solved in that the cold primary air supplied to the room by the aeration plant is cooled to a temperature which is at least 100 C below the ambient temperature. and in that this primary air, is mixed with the ambient air sucked as secondary air before it goes out into the room to be cooled as air

cold arrival.

  As in the new process, for the same

  arrival air temperature, ie the same temperature

  In the same way as the air entering the residence zone as before, the primary air can be cooled more strongly, preferably 12-18 ° C below ambient temperature, the quantities of air can be decisively reduced. primary air needed; therefore, the total aeration installation can be smaller and more compact

  and the expenditure of energy for the transport of primary air

  mayor can be reduced considerably The ambient air

  mixed with cold primary air is then removed, preferably

  but not necessarily of the room to be cooled.

  It has been found to be advantageous for many

  the comfort conditions of the living area of the occupants of the room, that the cold primary air and the ambient air be mixed with each other in a ratio of 4: 1 to 1: 1, the ratio optimum mixing, especially at a value of 3: 2, when

  account of economic points of view.

  A device for implementing the new method is characterized in that the supply duct of the ventilation system for the cold primary air, which

  contains a flow regulator, ends in a chamber

  pressure nozzle of an induction apparatus, from which nozzle-shaped outlets are directed inwardly of a discharge chamber, and further that the discharge chamber is surrounded by a suction chamber for secondary air that is equipped

  at least one suction port for the ambient air.

  It is obvious that even in the new

  tif, as before, it is necessary to

  to general requirements for damping as good as possible of noise and to avoid as much as possible the condensation of moisture on the cold parts of the device For this purpose, we have solutions particularly space-saving when the pressure chamber contains a noise damper which consists of noise-absorbing tubes of different diameters interlocking telescopically with one another, and / or when the spatial boundaries of the induction apparatus or within the the latter are such that at least partially results in an absorption of sound

  and / or isolation from heat.

  As already indicated, part of the problem posed is constituted by the fact that the mixing ratio between primary air and secondary air-or induced ambient must remain at least approximately constant for all the variable quantities of primary air; this is guaranteed by the new device in that, during the mixing of ambient air inside the induction apparatus, for all the quantities of primary air, the resistance

  of ambient air intake is roughly in a ratio

  fixed port relative to the air output speed

  primary outlet outlets in the form of nozzles.

  It is therefore possible, by shaping these outlet nozzles and / or calculating the resistance of the ambient or secondary air stream sucked, during the design of the induction apparatus, to establish in the air flow of arrival or mix that goes out to the room, pretty much a report

  determined between primary and secondary air, and

  especially culer this ratio so that the air portion

  60% primary and 40% secondary air.

  Another essential advantage of the present invention

  tion is the relative pressure drop

weak in the induction apparatus.

  The invention will now be described and

  on an exemplary embodiment in the light of the drawings in which:

  * Figure 1 shows the overall plan corresponding to

  laying down in section I-I of Figure 2, an apparatus for

  duction belonging to the device according to the present invention.

  tion; Figure 2 is a section along the line II-II of Figure 1; and FIG. 3 represents a section along the line

III-III of Figure 2.

  An induction apparatus 1 (FIG. 1) is supplied with primary air treated and cooled in the non-illustrated air preparation installation via a pipe 2 which penetrates into the envelope 3 of the apparatus 1

  and ends in a pressure chamber 4; the extré-

  free mite of the pipe 2 exceeds in the room under

  pressure 4 and contains a flow regulator 5 of

  known truction Using this / the amount of primary air is controlled in a known manner according to the ambient temperature which is detected by a thermostat

of atmosphere 6.

  In the pressure chamber 4 there are provided as noise dampers two tube sections 7 and 8 fitting telescopically into one another and belonging to noise damping tubes of different diameters; thanks to those-it's primary air from the room

  under pressure 4 is forced to flow into an alternating current

  native, so that despite the relatively small dimensions of tube sections 7 and 8, we get a good

sound damping.

  The pressure chamber 4 is limited, at right angles to the direction of entry of the primary air, by an intermediate wall 9 in which are provided

  outlet ports in the form of nozzles 10 These are

  placed in such a way that the primary air jets leaving it are directed into an exhaust chamber 11 which is constituted by a hollow parallelepiped 12 at the end, this exhaust chamber 11 is closed by the outlet orifice 14 provided with in a known way of a grid and by

  which the arrival air is blown into the room 15.

  The hollow parallelepiped 12 is surrounded by a suction chamber 16 limited by the envelope 3 and intended for the ambient air sucked as secondary air by the "jets" of primary air and which is sucked into these "jets" "by an annular gap 17 acting in the manner

  a venturi and lying between the edge of the parallelepiped

  Hollow fede 12 and the intermediate wall 9.

  The ambient air can return to the room of

  16 from the piece 15 by a suction port 13 in the envelope 3 also closed by a grid.

  Preferably, the induction apparatus is dis-

  placed in such a manner in the vicinity of the ceiling of the room to be cooled as can be clearly seen in

  figure 2.1 air of arrival or mixture coming out of the original

  output fuse 14 escapes parallel to the ceiling, substantially horizontally towards the interior of the room, and that the suction port 13 is provided in the "bottom" of the casing 3, and that the air ambient is

sucked from the bottom.

  To avoid the constitution of condensation water and to obtain in addition to the sound absorber 7, 8 a

  noise damping, envelope 3 and parallelepiped

  hollow hollow 12 are made from a material with thermal and sound insulation such as for example glass wool or mineral wool. An example is given below to demonstrate the effectiveness of the new process: It is assumed that the maximum amount of heat

  to dissipate is 700 W to keep the room cool

  dir at a constant ambient temperature of 260 C For this heat dissipation a primary air flow of 160 m 3 / h at a temperature of about 12,50 C enters the induction unit 1 In the appliance 1 induced

  towards the primary air flow as a secondary air

  d, 110 m 3 / h of ambient air using the primary air stream coming from the pressure chamber 4 through the nozzles 10 with a speed of 11 m / sec The incoming air coming out of the grate 14 towards the door 15 room

  - thus in maximum operation 270 m 3 / h; it has a temperature

  approximately 18 ° C. If we only want one

  minimum cooling capacity, the amount of air

  Mayor flowing with temperatures remaining

  aunts is 80 m 3 / h; from this primary air stream

  mayor reduces / draws as secondary air 55 m 3 / h of ambient air, which gives an air flow of arrival of

m 3 / h.

  The proportion of primary air in the mixing air or the intake air is therefore approximately constant at just 60%, while that of ambient air is approximately

little more than 40%.

Claims (7)

CLASS I CAT IONS   1 Process for the individual cooling of   parts of a building using a central installation   aeration that brings the necessary air for renewal   the air and for its humidification and   for cooling the room, to the different parts   these from an air treatment facility, in   as cooling air with a constant temperature   aunt being significantly below the temperature   ambient, while to regulate the cooling power   the amount of cold incoming supply air, exceeding the minimum amount of air, is controlled by a   room thermostat, characterized by cooling   cooling of the cold primary air supplied to the room (15) by the ventilation plant at a temperature at least 10 ° C below the ambient temperature, and by mixing this primary air with ambient air sucked in as a secondary air before it exits as cold arrival air to the room at cool (15).   Process according to Claim 1, characterized   in that the cold primary air is cooled to temperatures   at 12-18 ° C below the temperature ambient temperature.   3 Process according to claim 1, characterized   in that the cold primary air and the ambient air are mixed   to each other in a ratio of 4: 1 to 1: 1, in particular a ratio of 3: 2.   4 Process according to claim 1, characterized in that the ambient air is sucked directly out of the piece to be cooled (15).   Device for carrying out the method according to claim 1, characterized in that the inlet pipe (2) of the aeration plant, containing a flow regulator (5), and intended for the cold primary air is terminates in a pressure chamber (4) of an induction apparatus (1) from which   outlet (10) are directed towards a chamber   exhaust outlet (11), and that in addition the chamber   exhaust (11) is surrounded by a suction chamber   (16), for the secondary air, which is provided with at least one suction port (13) for the ambient air   Device according to claim 5, characterized   in that the pressure chamber (4) has a   sound absorber which consists of insulating tubes   risers- (7, 8) of different diameters, fitting   copically into each other.   Device according to claim 5 or 6, characterized in that the spatial boundaries (3, 12) of the induction apparatus (1) or inside thereof   are such that they absorb at least partially   sound and / or insulate from heat.   8 Device according to any one of the   5 to 7, characterized in that in the induction apparatus (1) / the shape and / or dimensions of the chambers (11) or parts (16) as well as the outlet, suction and / or or exhaust (10, 13, 14) are   that the mixed air stream coming out of the exhaust chamber   (11) contains about 60% of cold primary air and 40% of secondary air sucked.