Supply Air Unit

Abstract

The supply air unit ( 100 ) comprises a supply air chamber ( 10 ), at least one mixing chamber ( 20 a , 20 b ), which opens into the air-conditioned room space, nozzles ( 60 a , 60 b ), through which a fresh airflow (L 1 ) is conducted from the supply air chamber ( 10 ) into the mixing chamber, a first heat-transfer unit (A), which comprises at least one heat exchanger ( 30 a , 30 b ), through which a circulated airflow (L 2 ) is conducted from the room space into the mixing chamber. The supply air unit also comprises a second heat-transfer unit (B), which is formed by at least one radiating element ( 50 ), which has a radiating surface ( 51 ), to which heat is transferred from the air-conditioned room space for cooling or from which heat is transferred into the air-conditioned room space for heating, and which radiating surface also comprises openings, whereby the radiating surface becomes sound-absorbing.

1 . Supply air unit ( 100 ), which comprises:
 a supply air chamber ( 10 ),   at least one mixing chamber ( 20 ,  20   a ,  20   b ), which opens into the air-conditioned room space,   nozzles ( 60 ,  60   a ,  60   b ) or a nozzle gap, through which a fresh airflow (L 1 ) is conducted from the supply air chamber ( 10 ) into said at least one mixing chamber ( 20   a ,  20   b ),   a first heat-transfer unit (A), which is formed by at least one heat exchanger ( 30 ,  30   a ,  30   b ), through which a circulated airflow (L 2 ) is conducted from the air-conditioned room space into said at least one mixing chamber ( 20 ,  20   a ,  20   b ), whereby the circulated airflow (L 2 ) is heated or cooled in said at least one heat exchanger ( 30 ,  30   a ,  30   b ),   
       characterised in that the supply air unit also comprises:
 a second heat-transfer unit (B), which is formed by at least one radiating element ( 50 ), which is located in the lower part of the supply air unit ( 100 ) and in which there is a radiating surface ( 51 ), to which heat is transferred from the air-conditioned room space for cooling, or from which heat is transferred into the air-conditioned room space for heating, which radiating surface ( 51 ) also comprises openings, whereby the radiating surface ( 51 ) becomes sound-absorbing. 
 
     
     
         2 . Supply air unit ( 100 ) according to  claim 1 , characterised in that the first heat-transfer unit (A) comprises a first heat-transfer tubing ( 32   a ,  32   b ) and the second heat-transfer unit (B) comprises a second heat-transfer tubing ( 52 ), which are connected together in series. 
     
     
         3 . Supply air unit ( 100 ) according to  claim 2 , characterised in that the first heat-transfer unit's (A) heat-transfer tubing ( 32   a ,  32   b ) and the second heat-transfer unit's (B) heat-transfer tubing ( 52 ) are mutually dimensioned in such a way that the heat-carrying liquid's flow velocity is higher in the second heat-transfer unit's (B) heat-transfer circuit ( 52 ) in comparison with the heat-carrying liquid's flow velocity in the first heat-transfer unit's (A) heat-transfer circuit ( 32   a ,  32   b ). 
     
     
         4 . Supply air unit ( 100 ) according to any of  claims 1 - 3 , characterised in that the radiating element ( 50 ) comprises heat-transfer tubes ( 52 ) located above the radiating surface ( 51 ) and an insulation ( 53 ), which prevents the cooling or heating effect of the heat-transfer tubes ( 52 ) from moving upwards from the radiating element ( 50 ). 
     
     
         5 . Supply air unit ( 100 ) according to any of  claims 1 - 4 , characterised in that, thus, the radiating element's ( 50 ) radiating surface ( 51 ) is formed by a horizontal planar surface. 
     
     
         6 . Supply air unit ( 100 ) according to any of  claims 1 - 5 , characterised in that the supply air unit ( 100 ) is mounted at its top part to the ceiling, and the second heat-transfer unit (B) is mounted into the lower part of supply air unit ( 100 ). 
     
     
         7 . Supply air unit ( 100 ) according to any of  claims 1 - 6 , characterised in that the supply air unit ( 100 ) comprises:
 a supply air chamber ( 10 ), wherein there are vertical side walls ( 11   a ,  11   b ), a bottom wall ( 11   c ) and a roof wall ( 11   d ), at which the supply air chamber ( 10 ) is suspended from the ceiling (K),   two heat exchangers ( 30   a ,  30   b ),   two mixing chambers ( 20   a ,  20   b ), which are formed in a space between the supply air chamber's ( 10 ) side walls ( 11   a ,  11   b ) and the heat exchangers ( 30   a ,  30   b ) located at a distance from them,   a row of nozzles ( 60   a ,  60   b ) or a nozzle gap in the lower part of each mixing chamber ( 20   a ,  20   b ), whereby a fresh airflow (L 1 ) is conducted from the supply air chamber ( 10 ) through the row of nozzles ( 60   a ,  60   b ) or the nozzle gap into the mixing chambers ( 20   a ,  20   b ) upwards in the vertical direction,   a radiating element ( 50 ), which is mounted to the supply air chamber's ( 10 ) bottom wall ( 11   c ).   
     
     
         8 . Supply air unit ( 100 ) according to  claim 7 , characterised in that in the top part of the mixing chambers ( 20   a ,  20   b ) there are outlet openings ( 25   a ,  25   b ), which are formed in such a way that the combined airflow (LA) discharging from the mixing chambers ( 20   a ,  20   b ) is directed horizontally in the direction of the ceiling surface.