Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
  • F24F13/26—Arrangements for air-circulation by means of induction, e.g. by fluid coupling or thermal effect
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
  • F24F1/01—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station in which secondary air is induced by injector action of the primary air
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
  • F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
  • F24F1/022—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing comprising a compressor cycle
  • F24F1/027—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing comprising a compressor cycle mounted in wall openings, e.g. in windows
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
  • F24F13/24—Means for preventing or suppressing noise

Definitions

• the present invention relates to an air conditioning device, and a method of air conditioning of a confined environment.
• the air conditioning devices integrated in the ceiling of confined rooms are well known.
• a first type relates to the static type of cold beams, in which the air passes through a cooled exchanger, the air flow being generated by simple convection.
• a second type of cold beams is dynamic cold beams in which a flow of fresh air from outside the confined space is mixed with secondary air from the room to be air-conditioned.
• the primary air is injected at high pressure into nozzles, inducing a secondary air suction by venturi effect.
• This type of device has many advantages.
• a first advantage is that the injection of fresh air allows a renewal of the air of the confined environment.
• the primary fresh air can be further dried to prevent condensation.
• the secondary air passes through a cooled heat exchanger before mixing, which increases the cooling capacity of the complete device.
• these dynamic cold beams have other disadvantages that the present invention will seek to reduce.
• this type of device is usually noisy. Indeed, for optimum operation, the ratio between the supply of primary fresh air and the recirculation of secondary air should be about 1: 7.
• the pressure of the primary air, and its speed in the nozzles induce a noise difficult to withstand continuously.
• these dynamic beams generally operate with a secondary air / secondary air ratio lower than the optimum, generally between 1: 2 and 1: 6. This low ratio implies a renewal of air in the middle superior to what is necessary, involving a higher energy consumption than is strictly necessary.
• the European patent application EP1319901 discloses a device comprising two Venturi type devices arranged in series for mixing fresh air said primary with so-called secondary recirculated air. Nevertheless, the pressure at the inlet of the second Venturi device is largely insufficient, and does not achieve sufficient suction of secondary air, and the ratio between secondary air and primary air is still insufficient. Purpose of the invention
• the present invention aims to provide a dynamic cooling beam cooling device, with reduced noise while providing a primary air ratio / secondary air (recirculated) improved.
• it also aims to improve the thermal comfort associated with the use of the device of the invention.
• the present invention relates to an air conditioning device comprising a duct (chamber) for primary air intake connected to the inlet of a first venturi type device (inductor) whose suction communicates with a first secondary air intake duct (chamber), the outlet of the first venturi type device communicating with the inlet of a second venturi type device (inductor) whose suction is connected to a second duct secondary air inlet (chamber) comprising a first heat exchanger.
• the output of this device communicates directly or indirectly with the room to be air-conditioned.
• the first device of the venturi type comprises a primary air inlet nozzle comprising a diameter restriction at its free end, said free end opening into a suction chamber communicating with the first conduit of secondary air inlet, said suction chamber comprising an outlet port facing the outlet of said inlet nozzle, said outlet port communicating with the inlet of the second venturi type device.
• the second venturi-type device comprises an intake chamber (or mixing chamber), the admission chamber having a section at least twice as large as the outlet orifice of the suction chamber of the first venturi type device.
• the second device of the venturi type comprises a plate pierced with orifices said plate separating the inlet chamber communicating with the outlet of the first mixing device and a mixing chamber communicating with the second intake duct of secondary air, said orifices producing, in use, a venturi effect sucking the secondary air from the second secondary air intake duct.
• the device of the invention comprises a valve or adjustable valve for injecting primary air directly to the inlet of the second device venturi type, downstream of the first venturi device, so as to be able to regulate the total mixing ratio between primary and secondary air.
• the first secondary air intake duct comprises a second heat exchanger allowing in use to cool the secondary air.
• the heat exchanger (s) comprise vertical fins, and a condensate removal device at the bottom thereof.
• a second aspect of the invention relates to a facade, a facade element or an element allowing access to the facade of a building comprising an air conditioning device according to any one of the preceding claims.
• the facade of the invention comprises two walls separated by a ventilation space, the first and second secondary air intake ducts communicating with said ventilation space.
• the second wall may be of the curtain or helioscreen type, or, preferably, the facade will be of the active facade type.
• a third aspect of the invention relates to a method of air conditioning a confined space comprising the following steps: a. withdrawing outside air, called primary air, and bringing it to a predetermined pressure;
• the air conditioning method of the invention further comprises one or a suitable combination of several of the following characteristics:
• the first air mixture is compressed in a mixing chamber communicating with the outlet orifice of the suction chamber, said intake chamber having a section at least twice as large as the outlet orifice of the suction chamber, so as to induce a compression of the first air mixture;
• Said predetermined pressure is between 100 and 1000 Pa, preferably between 300 and 500 Pa;
• the ratio between the intake of primary air and secondary air in the first mixing device is between 0.7 and 2.5, preferably between 0.9 and 2.5, advantageously greater than 1.6 ;
• the flow ratio between the admission of the first mixture of air and secondary air in the second mixing device is between 2 and 4;
• the pressure of the first air mixture at the inlet of the second venturi device is between 50 and 200 Pa, preferably between 70 and 150 Pa;
• the primary air taken in step (a) is brought to a predetermined temperature before being injected into said first venturi device.
• Figure 1 shows a cutaway view of an example of an air conditioning device according to the invention.
• Figure 2 shows a side view in section along the plane AA "of Figure 1.
• Figure 3 shows a side view in section along the plane BB 'of Figure 1.
• Figure 4 shows a side view in section along the plane BB 'of Figure 1, the device comprising a valve "bypass" in the open position.
• the present invention relates to an air conditioning device 10 of the dynamic cold beam type comprising a dual induction module of the secondary air, allowing, in use, to increase the ratio between the primary air flow rate 18 , 22 outside injected into the room to be air-conditioned, and the recirculated secondary air flow 16,17.
• the use of two induction modules of the Venturi type, arranged in series, makes it possible to reduce the noise, without increasing the necessary primary air pressure, while making it possible to increase the secondary air flow rate for an air flow rate. given primary.
• venturi-type device or induction device any type of device in which a first air flow is accelerated by a section restriction of the fluid path inducing suction of a second air flow. by venturi effect. It is typically a device of the ejector or eductor type, either in the form of nozzles, diaphragms, or more complex devices comprising an inlet nozzle, a suction chamber and an outlet nozzle.
• inlet of a venturi device is meant the entry of the first air flow.
• This nozzle opens into a suction chamber 2 communicating with a secondary air duct 9 (from the room to be air-conditioned).
• the suction chamber 2 also comprises an outlet orifice 15 facing the outlet of the injection nozzle 3.
• This orifice 15 will advantageously be extended by a streamlined ejection nozzle, so as to reduce turbulence and the noise generated by these turbulences.
• the first venturi device is dimensioned so that the flow ratio between the primary air 18 and the air induced by the first venturi device is between 0.7 and 1.5.
• the second venturi type device comprises an intake chamber, the inlet chamber having a section at least twice as large as the outlet orifice of the suction chamber. Increasing section of the inlet chamber allows compression of the first mixture of air, which greatly improves the induction of air by the second Venturi-type device.
• the temperature of the primary air 18 will preferably be between 14 and 18 ° C depending on the cooling power required. This primary air 18 will also have a humidity controlled to reduce the relative humidity of the room, so as to avoid any condensation phenomenon. Finally, the pressure of the primary air 18 will preferably be between 300 and 500 Pa, ideally around 400 Pa.
• the pressures in this description are of course relative pressures relative to the ambient atmospheric pressure (pressure difference with respect to the atmosphere).
• the second induction device will preferably be in the form of a wall 14 (plate) separating the inlet chamber or mixing chamber 4 in which opens the outlet 15 of the first venturi device of a second chamber mixture 6 in which opens a second secondary air intake duct 1 1.
• This second intake duct comprises a main heat exchanger 8 for effectively cooling the secondary air flow 16 induced by the second venturi device.
• the wall 14 will comprise orifices 5 communicating between the first mixing chamber 4 and the second mixing chamber 6. These orifices 5 will be either in the form of simple diaphragms or in the form of nozzles inducing an increase in the speed of rotation. air, and thereby a venturi effect sucking the secondary air 16 through the main heat exchanger 8.
• the pressure in the first mixing chamber 4 is preferably between 50 and 100 Pa, so as to reduce the noise generated by the device.
• the flow ratio between the secondary air inlet 16 of the second venturi device and the outlet 19 of the first induction device is preferably between 2 and 4, bringing the total ratio between primary air and air induced by both venturi devices to a value greater than about 4, preferably greater than 6, and even more preferably greater than 7.
• FIG. 4 shows the operation of the device when the valve 21 is in position opened.
• a primary air flow 22 is admitted directly into the inlet chamber 4.
• the first secondary air intake duct will comprise a non-return device (not shown), for example in the form of a valve preventing a reverse flow of primary air.
• a secondary heat exchanger 7 may advantageously be placed on the fluid path of the secondary air flow 17 upstream of the suction of the first venturi type device. This secondary heat exchanger 7 makes it possible on the one hand to increase the total power of the device, and on the other hand to regulate the humidity of the mixture in the first mixing chamber 4.
• the temperature of the heat exchangers 7,8 is maintained at a temperature between 14 and 20 ⁇ , so as to avoid condensation while providing sufficient cooling power.
• This setpoint temperature will be adapted according to the power required and the relative humidity of the secondary air.
• the air conditioning module (device) of the invention is integrated in front, above the windows, so as to induce a secondary air flow in front of the hot zone induced by the glazing of the building.
• This hot zone can advantageously be optimized by the use of devices simulating an active facade, such as curtains or helioscreens.
• the air conditioning module of the invention is integrated with an active facade comprising a ventilated space between two walls, the ducts 9.1 1 of secondary air being connected to said ventilated space.
• the conditioned air circulation between the two walls makes it possible to cool the internal wall, and thereby improve the comfort of the air-conditioned room, the walls of the room having a lowered temperature, which improves the comfort.
• the arrangement on the front allows the use of vertical exchangers, which allows a collection and easy evacuation of the possible condensation on the fins of these exchangers.
• the integration of the air conditioning module of the invention in front also reduces congestion, the primary air ducts and cold water can easily be integrated into said facade, avoiding having to integrate the beams in the ceilings, posing difficulties of installation and maintenance.
• the device of the invention may advantageously integrate one or more carbon filters.
• the internal surfaces of the mixing chambers and venturis may be covered with catalytic paint comprising Ag ions or titanium oxide photocatalytic paints that allow the use of UV light sources to reduce the volatile organic compounds present in the room.
• the primary fresh air can also be taken directly to the front by means of a fan, the humidity control is then directly along the heat exchangers, by means of condensate tray placed under the heat exchangers.
• FIG. 1 to 4 An embodiment of a device 10 according to the invention is shown in Figures 1 to 4.
• This device is integrated into an active facade in which the air is warmed by the action of the sun in a ventilated space included between 2 windows.
• the air in the ventilated space communicates with the room to be conditioned by the bottom of the active window, so as to increase the natural convection through the device, thus further improving the secondary air flow.
• a distribution duct 12 placed in front provides conditioned primary air.
• the air in the duct is maintained at a pressure of 410 Pa and a temperature of about 14 ⁇ C.
• the humidity of the primary air is about 90%.
• This air is conditioned by means of a first centralized battery for the whole building.
• the energy consumption of this first battery, per air conditioning module is around 283W for an outside temperature of 32 ⁇ C and a relative humidity of 50%.
• This air-conditioned primary air 18 is fed through a distribution chamber 1 to a nozzle 3 opening into the first suction chamber 2.
• the air-conditioned primary air flow in each facade module is 25m 3 / h.
• the air-conditioned primary air flow at the outlet of the nozzle 3 sucks through an orifice 13 of the secondary air 17.
• This secondary air from the intake duct 9 passes through a heat exchanger 7 before to be mixed with the primary air 18 in the suction chamber 2.
• the temperature of the cooling water in this exchanger is 12 ⁇ C input and 14 ⁇ C output.
• the power consumed by this battery is around 146W.
• the secondary air 17 comes from an active facade, and enters the heat exchanger at a temperature of 34 ⁇ C and 36% relative humidity.
• the secondary air flow rate 17 in this first heat exchanger 7, induced by the primary air flow is 25m 3 / h.
• the mixture 19 of primary air 18 and secondary 17 induced by the first venturi is injected into a chamber 4 defined by a wall 14 pierced with openings 5 opening on a second suction chamber 6.
• Air secondary 16 enters the second suction chamber 6 through a second heat exchanger 8.
• the secondary air sucked by the pipe 1 1 comes again from the active facade and has the same input characteristics as the air admitted by the duct 9.
• the secondary air flow induced in this second venturi is about 150m 3 / h.
• an air flow rate of 200m 3 / h is obtained, for a primary air flow rate of 25m 3 / h, ie a multiplicative factor of 8 (or a 1: 7 ratio).
• the air output in this example is ⁇ ⁇ ' ⁇ , for an ambient temperature of 26 ' ⁇ . This air conditioning is ejected through the orifice 23.
• a valve 20, 21 allows the need to bypass the first inductor (venturi), so as to increase the reduce the multiplicative factor of the device.
• the primary air flow rate rises to 50m 3 / h, while the secondary air flow induced in the second inductor remains constant at 150m 3 / h, passing from a multiplicative factor of 8 at 4.
• the two heat exchangers 7,8 being contiguous, in practice, we can use a single heat exchanger with a wall separating the two ducts. Nevertheless, it may be advantageous to regulate these two heat exchangers separately, so as to avoid any condensation in the first mixing chamber.
• the module dimensions of the example are compatible with the dimensions of windows usually used in the building, in this case, in this example, the width of the second heat exchanger is 1 m, and 25 cm for the first exchanger.
• the height of the first and second heat exchangers is 29cm, while the total height of the module (including the distribution duct 12 of the primary air) is 60cm.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Central Air Conditioning (AREA)
• Duct Arrangements (AREA)
• Jet Pumps And Other Pumps (AREA)

Priority Applications (11)

Applications Claiming Priority (2)

Publications (1)

Family

ID=48189988

Family Applications (1)

Country Status (12)

Families Citing this family (3)

Citations (5)

Family Cites Families (10)

• 2013
  • 2013-03-05 BE BE2013/0144A patent/BE1021395B1/fr active
• 2014
  • 2014-02-26 EA EA201591633A patent/EA201591633A1/ru unknown
  • 2014-02-26 JP JP2015560615A patent/JP6521869B2/ja active Active
  • 2014-02-26 US US14/772,927 patent/US20160018128A1/en not_active Abandoned
  • 2014-02-26 EP EP14710207.3A patent/EP2965021B1/fr active Active
  • 2014-02-26 SG SG11201507095YA patent/SG11201507095YA/en unknown
  • 2014-02-26 CN CN201480011667.XA patent/CN105026850B/zh active Active
  • 2014-02-26 WO PCT/EP2014/053677 patent/WO2014135406A1/fr active Application Filing
  • 2014-02-26 CA CA2903915A patent/CA2903915A1/fr not_active Abandoned
• 2015
  • 2015-09-01 PH PH12015501923A patent/PH12015501923A1/en unknown
  • 2015-09-30 IN IN9035DEN2015 patent/IN2015DN09035A/en unknown
  • 2015-10-01 ZA ZA2015/07299A patent/ZA201507299B/en unknown

Patent Citations (5)

Also Published As

Similar Documents

Legal Events