Air Conditioning Unit

Abstract

The present invention relates to an air conditioning unit comprising a conditioned primary air intake pipe ( 1 ) connected to the inlet of a first Venturi-type device the aspiration of which communicates with a first secondary air intake pipe ( 9 ), the outlet from the first Venturi-type device communicating with the inlet of a second Venturi-type device the aspiration of which is connected to a second secondary air intake pipe ( 11 ) comprising a main heat exchanger ( 8 ).

1 . An air conditioning device ( 10 ) comprising a primary air intake pipe ( 1 ) connected to the inlet of a first Venturi-type device whereof the suction communicates with a first secondary air intake pipe ( 9 ), the outlet of the first Venturi-type device communicating with the inlet of a second Venturi-type device whereof the suction is connected to a second secondary air intake pipe ( 11 ) comprising a main heat exchanger ( 8 ), the first Venturi-type device comprising a primary air inlet nozzle ( 3 ) comprising a diameter restriction at its free end, said free end emerging in a suction chamber ( 2 ) communicating with the first secondary air intake pipe ( 9 ), said suction chamber ( 2 ) comprising an outlet orifice ( 15 ) across from the outlet of said inlet nozzle, said outlet orifice ( 15 ) communicating with the inlet of the second Venturi-type device, characterized in that the second Venturi-type device comprises an intake chamber ( 4 ), said intake chamber ( 4 ) having a section at least twice as large as the outlet orifice ( 15 ) of the suction chamber ( 2 ). 
     
     
         2 . The air conditioning device ( 10 ) according to  claim 1 , wherein the second Venturi-type device comprises a plate ( 14 ) pierced with orifices ( 5 ), said plate separating the intake chamber ( 4 ) communicating with the outlet ( 15 ) of the first mixing device and a mixing chamber ( 6 ) communicating with the second secondary air intake pipe ( 11 ), said orifices ( 5 ) producing, during use, a Venturi effect suctioning the secondary air. 
     
     
         3 . The air conditioning device ( 10 ) according to  claim 1 , wherein the first secondary air intake pipe ( 9 ) comprises a secondary heat exchanger ( 7 ). 
     
     
         4 . The air conditioning device ( 10 ) according to  claim 1 , wherein the heat exchanger(s) comprise vertical fins, and a device discharging condensation at the bottom thereof. 
     
     
         5 . The air conditioning device ( 10 ) according to  claim 1 , wherein an adjustable gate makes it possible to inject primary air directly at the inlet of the second Venturi-type device, downstream from the first Venturi-type device, so as to be able to regulate the total mixture ratio between the primary air and the secondary air. 
     
     
         6 . A facade comprising an air conditioning device ( 10 ) according to  claim 1 . 
     
     
         7 . The facade according to  claim 6 , comprising two walls separated by a ventilation space, the first and second secondary air intake pipes being connected to said ventilation space. 
     
     
         8 . A method for air conditioning a confined space comprising the following steps:
 a. drawing in outside air ( 18 ), called primary air, and bringing it to a predetermined pressure;   b. injecting said primary air ( 18 ) into a Venturi-type device, suctioning from a suction chamber ( 2 ) and mixing air from the confined space, called secondary air ( 17 ), with the primary air, the secondary air passing, before mixing, into a first heat exchanger ( 7 ) regulated to a setpoint temperature thus obtaining a first air mixture ( 19 );   c. injecting the first air mixture ( 19 ) into a second Venturi-type device, suctioning and mixing secondary air ( 16 ) with said first air mixture ( 19 ), the secondary air passing, before mixing, into a second heat exchanger ( 8 ) regulated to a setpoint temperature;   d. reinjecting the obtained air mixture into the confined space;
 characterized in that the first air mixture ( 19 ) is compressed in a mixing chamber ( 4 ) communicating with the outlet orifice ( 15 ) of the suction chamber ( 2 ), said intake chamber ( 4 ) having a section at least twice as large as the outlet orifice ( 15 ) of the suction chamber ( 2 ), so as to cause compression of the first air mixture ( 19 ). 
   
     
     
         9 . The method according to  claim 8 , wherein said predetermined pressure is comprised between 100 and 1,000 Pa. 
     
     
         10 . The method according to  claim 8 , wherein the ratio between the intake of primary air and secondary air in the first mixing device is comprised between 0.7 and 2.5. 
     
     
         11 . The method according to  claim 8 , wherein the flow ratio between the intake of the first air mixture and secondary air in the second mixing device is comprised between 2 and 4. 
     
     
         12 . The method according to  claim 8 , wherein the pressure of the first air mixture at the inlet of the second Venturi device is comprised between 50 and 100 Pa. 
     
     
         13 . The method according to  claim 8 , wherein the secondary air flows in a ventilated space between two walls of an active facade before being suctioned through the heat exchangers ( 7 ,  8 ). 
     
     
         14 . The method according to  claim 8 , wherein the primary air drawn in in step (a) is brought to a predetermined temperature before being injected into said first Venturi-type device.