Supply air unit

Abstract

A supply air unit including a supply air chamber, at least one mixing chamber nozzles or a nozzle gap through which a fresh airflow is conducted from the supply air chamber into the mixing chamber, a suction chamber into which a circulated airflow is sucked from an air-conditioned room space, and at least one outlet opening. At least one airflow controller through which an additional airflow is conducted from the supply air chamber into the suction chamber.

1 . A supply air unit, comprising:
 a supply air chamber,   at least one mixing chamber,   nozzles or a nozzle gap, through which a fresh airflow is conducted from the supply air chamber to said at least one mixing chamber,   at least one suction chamber into which a circulated airflow is conducted from an air-conditioned room space,   at least one outlet opening through which a combined airflow located in said at least one mixing chamber from the fresh airflow and the circulated airflow is conducted into the air-conditioned room space, and   at least one airflow controller through which is conducted an additional airflow from the supply air chamber to said at least one suction chamber, from which the additional airflow is sucked along with the circulated airflow into said at least one mixing chamber.   
     
     
         2 . The supply air unit according to  claim 1 , further comprising:
 at least one heat exchanger comprising a supply side and an opposite outlet side,   whereby said at least one mixing chamber is located in connection with the outlet side of said at least one heat exchanger, and said at least one suction chamber is located in connection with the supply side of said at least one heat exchanger,   whereby the circulated airflow and the additional airflow travel from said at least one suction chamber through said at least one heat exchanger from the supply side into said at least one mixing chamber located at the outlet side.   
     
     
         3 . The supply air unit according to  claim 1 , further comprising:
 a horizontal ceiling panel,   two elongated parallel heat exchangers located at a distance from each other, the two elongated parallel heat exchangers comprising top ends supported against a lower surface of the ceiling panel,   an elongated suction chamber, which is located in a space between the heat exchangers, at a supply side of the heat exchangers,   an elongated mixing chamber located outside each heat exchanger at an outlet side of the heat exchangers,   a supply air chamber comprising elongated lower sections located outside the mixing chambers and a one-piece top section, which connects the lower sections and which is located in the space between the horizontal ceiling panel and the parallel roof panel located at a distance from the one-piece top section,   nozzles which are located in the ceiling of the mixing chambers in the ceiling panel, and through which a fresh airflow is conducted from the supply air chamber into the mixing chambers,   a bottom plate which is supported against a lower end of the heat exchangers and which in its middle part comprises openings, through which the circulated airflow is conducted from the air-conditioned room space into the suction chamber,   an outlet opening which is located in the lower part of each mixing chamber and which is limited by the bottom surfaces of the lower sections of the supply air chamber and by the outer edges of the bottom plate, and   at least one airflow controller which is located in the ceiling of the suction chamber in the ceiling panel, and through which an additional airflow is conducted from the supply air chamber into the suction chamber, from which the additional airflow is sucked through the heat exchangers into the mixing chambers.   
     
     
         4 . The supply air unit according to  claim 1 , further comprising:
 a horizontal ceiling panel,   an elongated heat exchanger having a top end supported against the lower surface of the ceiling panel,   an elongated suction chamber located in a space between the heat exchanger and the vertical outer side wall at the supply side of the heat exchanger,   an elongated mixing chamber which is located at the outlet side of the heat exchanger,   a supply air chamber comprising an elongated lower section located outside the mixing chamber and an upper section, which is located in a space between the horizontal ceiling panel and the horizontal roof panel,   nozzles which are located in the ceiling of the mixing chamber in the ceiling panel, and through which a fresh airflow is conducted from the supply air chamber into the mixing chamber,   a bottom plate which is supported against the lower end of the heat exchanger, and the lower edge of the vertical outer side wall, and wherein a middle part of the bottom plate comprises openings, through which a circulated airflow is conducted from the air-conditioned room space into the suction chamber,   an outlet opening which is located in the lower part of the mixing chamber and which is limited by the bottom surface of the lower section of the supply air chamber and by the outer edge of the bottom plate,   at least one airflow controller which is located in the ceiling of the suction chamber in the ceiling panel, and through which an additional airflow is conducted from the supply air chamber into the suction chamber, from which the additional airflow is sucked through the heat exchanger into the mixing chamber.   
     
     
         5 . The supply air unit according to  claim 1 , further comprising:
 a horizontal round ceiling panel,   a ring-shaped heat exchanger having a top end supported against a lower surface of the ceiling panel,   a ring-shaped suction chamber located inside the ring-shaped heat exchanger at a supply side of the ring-shaped heat exchanger,   a ring-shaped mixing chamber located outside the ring-shaped heat exchanger at outlet side of the ring-shaped heat exchanger,   a supply air chamber comprising a lower section located outside the ring-shaped mixing chamber, and a one-piece upper section to which the lower ring-shaped section is joined and which is located in a space between the horizontal ceiling panel and the horizontal roof panel,   nozzles which are located in a ceiling of the ring-shaped mixing chamber in the ceiling panel, and through which a fresh airflow is conducted from the supply air chamber into the mixing chamber,   a bottom plate which is supported against the lower end of the ring-shaped heat exchanger, wherein a middle part of the bottom plate comprises openings, through which a circulated airflow is conducted from the air-conditioned room space into the suction chamber,   a ring-shaped outlet opening which is located in the lower part of the ring-shaped mixing chamber and which is limited by the bottom surface of the lower ring-shaped section of the supply air chamber and by an outer edge of the bottom plate, and   at least one airflow controller which is located in the ceiling of the suction chamber in the ceiling panel, and through which an additional airflow is conducted from the supply air chamber into the suction chamber, from which the additional airflow is sucked through the heat exchanger into the mixing chamber.   
     
     
         6 . The supply air unit according to  claim 1 , wherein said at least one airflow controller comprises a disc valve comprising:
 a bottom part which is supported against edges of a hole in the ceiling of the suction chamber,   a control disc, and   a threaded pin through which the control disc is supported to rotate in a threaded hole located in the middle of the bottom part,   whereby the rate of air discharging from the airflow controller can be controlled by controlling a distance of the control disc from the bottom part by turning the control disc.   
     
     
         7 . The supply air unit according to  claim 1 , said at least one airflow controller comprises a sector slot air valve, comprising:
 a bottom part which is supported against the edges of an opening in the ceiling of the suction chamber and which has a section comprising sector-like openings,   a damper which has sector-like openings, and   a threaded bolt which extends through a hole in the damper and fits into a threaded hole in the middle of the bottom plate,   whereby the rate of air discharging from the airflow controller can be controlled by controlling the extent of overlapping between the sector-like openings of the bottom part and the sector-like openings of the damper by turning the damper.   
     
     
         8 . The supply air unit according to  claim 1 , wherein said at least one airflow controller comprises a cylinder, which opens up sector-by-sector and which comprises:
 a bottom part which is supported against the edges of an opening in the ceiling of the suction chamber,   a bottom cylinder having an inner end supported against a bottom plate having an outer end closed by a first cover plate, wherein a casing of the bottom cylinder comprises first openings,   a control cylinder which is located on the outer surface of the casing of the bottom cylinder, the control cylinder comprising an outer end is closed by a second cover plate, the control cylinder further comprising a casing comprising second openings, and   a threaded bolt which extends through a hole in the cover plate of the control cylinder and fits into a threaded hole in the cover plate of the bottom cylinder,   whereby the rate of air discharging from the airflow controller can be controlled by controlling the extent of overlapping between the openings of the control cylinder and the openings of the bottom cylinder by turning the control cylinder.   
     
     
         9 . The supply air unit according to  claim 6 , wherein the airflow controller further comprises an air-permeable fabric through which the bypass flow of fresh air is conducted.